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Wang J, Liu W, Jiang H, Li C, Song H, Liu S, Li Y, Tian S, Ning P. Mechanical insights into desulfurization by peroxymonosulfate oxidation via a non-reactive oxygen species pathway. JOURNAL OF HAZARDOUS MATERIALS 2024; 472:134490. [PMID: 38696963 DOI: 10.1016/j.jhazmat.2024.134490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 04/17/2024] [Accepted: 04/29/2024] [Indexed: 05/04/2024]
Abstract
Air pollution by sulfur dioxide (SO2) remains a pressing concern for both the environment and human health. Desulfurization enhanced by persulfate based advanced oxidation processes (PS-AOPs) has been proven to be a feasible method. However, the inherent contradiction between the rapid diffusion mass transfer of SO2 in the "gas-liquid-gas" phase and the limited lifespan of reactive oxygen species (ROS) can not be ignored. Excessive investment in PS is required to sustainably generate ROS to achieve continuous desulfurization performance, which may lead to excessive PS consumption. To address this issue, whether PS can achieve the oxidation absorption of SO2 via a non-reactive oxygen species pathway was investigated. Experimental and computational results demonstrated that peroxymonosulfate (PMS) instead of peroxydisulfate (PDS) had a great SO2 removal performance, the utilization of PS could be effectively achieved by maintaining a 1:1 molar ratio of PMS and removed SO2. The presence of HOO bonds in the PMS introduced a partial positive charge to the oxygen atom, making the PMS polar and more susceptible to be attacked by the nucleophile HSO3-. So SO2 underwent a series of processes including dissolution, dissociation, one-oxygen atom transfer, and ionization before ultimately being converted into SO42- ions, effectively achieving its removal from flue gas. This study may presents a novel approach for achieving high-efficiency flue gas desulfurization.
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Affiliation(s)
- Jianfei Wang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Wenwei Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Haiyang Jiang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Chen Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, PR China.
| | - Haoran Song
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Shugen Liu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Yingjie Li
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, PR China
| | - Senlin Tian
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, PR China.
| | - Ping Ning
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, PR China; National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries, Kunming University of Science and Technology, Kunming 650500, PR China
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2
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Yan W, Qi G, Gao Y, Guo D, Jiao W, Liu Y. Removal of NO in flue gas simulated by the Fe 2+/Cu 2+-activated double oxidant system. ENVIRONMENTAL TECHNOLOGY 2024; 45:639-648. [PMID: 36036221 DOI: 10.1080/09593330.2022.2119606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
⋅ O H The wet denitrification technology has a good development prospect due to its simple system and mild reaction conditions, and related research has become a hot topic in the field of flue gas purification. In this work, a novel simultaneous removal technology of NO from flue gas using Fe2+/Cu2+-catalytic H2O2/(NH4)2S2O8 system was developed for the first time. The feasibility of this new flue gas cleaning technology was explored through a series of experiments and performance analyses. The mechanism of oxidation products, free radicals and simultaneous removal of NO was revealed. The effects of the main process parameters on the removal of NO were investigated. Relevant results demonstrated that the removal efficiency of NO was elevated when the concentration of (NH4)2S2O8 or reacting temperature increased, while it was decreased after increasing the raising of Fe2+, Cu2+ and H2O2 concentrations. The main radicals were and·S O 4 - , using the electron spin resonance technique in the solution, and played a very important role in NO removal. The main products were carried out by ion chromatography and elemental N material accountancy, and the results showed that it was sulfate and nitrate in the solution, which provided theoretical guidance for the subsequent treatment and resource utilization of the absorption solution. The results of the study provided a theoretical basis for the industrial application of wet denitrification.Highlights A new green process of NO removal by a wet process with Fe2+/Cu2+ activated (NH4)2S2O8 system is proposed in this paper;Elimination mechanisms and paths of NO are elucidated;The synergistic role produced by Cu2+ and Fe2+ is beneficial to the purification of NO;The synergistic role produced by (NH4)2S2O8 and H2O2 increased the concentration of free radicals in the solution;This process jointly considers the enhanced removal of NO and recycling of transition metal ions.
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Affiliation(s)
- Wenchao Yan
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemical Engineering and Technology, North University of China, Taiyuan, People's Republic of China
| | - Guisheng Qi
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemical Engineering and Technology, North University of China, Taiyuan, People's Republic of China
| | - Yusong Gao
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemical Engineering and Technology, North University of China, Taiyuan, People's Republic of China
| | - Da Guo
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemical Engineering and Technology, North University of China, Taiyuan, People's Republic of China
| | - Weizhou Jiao
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemical Engineering and Technology, North University of China, Taiyuan, People's Republic of China
| | - Youzhi Liu
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, School of Chemical Engineering and Technology, North University of China, Taiyuan, People's Republic of China
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Chen Q, Xiao Z, Deng M, Li D. Comparative study on direct and indirect methods for wet desulphurisation and denitrification based on micro-nano bubbles. ENVIRONMENTAL TECHNOLOGY 2024; 45:40-49. [PMID: 35793811 DOI: 10.1080/09593330.2022.2099308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 06/24/2022] [Indexed: 06/15/2023]
Abstract
The wet desulphurisation and denitrification technique based on micro-nano bubbles, which is available by either D-method or I-method, is a promising novel process. By employing piped water, Na2SO3 aqueous solution and HA-Na aqueous solution as the absorption liquids, a comparative study was conducted in this article on D-method and I-method to analyze their performance, advantages and disadvantages. It was accompanied by an investigation of how initial pH and initial temperature values of the absorption liquids affected the removal efficiency. The results suggested a positive correlation between NO/SO2 removal efficiencies and pH values but a little improvement in the removal efficiency under alkaline conditions. Furthermore, heating the absorption liquids inhibited the removal of NO and SO2. When manipulated in the same experimental environment, D-method and I-method did not present a significant difference in the SO2 removal efficiency, while the former was remarkably more effective than the latter in removing NO. To put together, D-method had higher removal efficiency, but required a large-scale micro-nano bubble generator to process a large quantity of flue gas as the micro-nano bubble generator was subject to a limited inlet flow rate. Consequently, an increase in investment and operating costs was incurred, while this issue could be avoided by I-method.
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Affiliation(s)
- Qin Chen
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
- School of Resources and Environmental Engineering, Shanghai Polytechnic University, Shanghai, People's Republic of China
| | - Zhengguo Xiao
- Energy Conservation and Environmental Protection Center, Shanghai Textile Research Institute Co. Ltd, Shanghai, People's Republic of China
| | - Mingqiang Deng
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Dengxin Li
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
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Che M, Su H, Zhao X, Fu D, Huang R, Guo X, Su R. Tannic acid promotes the activation of persulfate with Fe(ii) for highly efficient trichloroethylene removal. RSC Adv 2023; 13:34371-34377. [PMID: 38024972 PMCID: PMC10665609 DOI: 10.1039/d3ra06004g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Accepted: 10/24/2023] [Indexed: 12/01/2023] Open
Abstract
Trichloroethylene (TCE) is an Environmental Protection Agency (EPA) priority pollutant that is difficult to be removed by some remediation methods. For instance, TCE removal using persulfate (PS) activated by ferrous iron (Fe(ii)) has been tested but is limited by the unstable Fe(ii) concentration and the initial pH of contaminated water samples. Here we reported a new TCE removal system, in which tannic acid (TA) promoted the activation of PS with Fe(ii) (TA-Fe(ii)-PS system). The effect of initial pH, temperature, and concentrations of PS, Fe(ii), TA, inorganic anions and humic acid on TCE removal was investigated. We found that the TA-Fe(ii)-PS system with 80 mg L-1 of TA, 1.5 mM of Fe(ii) and 15 mM of PS yielded about 96.2-99.1% TCE removal in the pH range of 1.5-11.0. Radical quenching experiments were performed to identify active species. Results showed that SO4˙- and ˙OH were primarily responsible for TCE removal in the TA-Fe(ii)-PS system. In the presence of TA, the Fe-TA chelation and the reduction of TA could regulate Fe(ii) concentration and activate persulfate for continuously releasing reactive species under alkaline conditions. Based on the excellent removal performance for TCE, the TA-Fe(ii)-PS system becomes a promising candidate for controlling TCE in groundwater.
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Affiliation(s)
- Mingda Che
- State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University Tianjin 300072 P. R. China
| | - Hongjian Su
- 514 Brigade of North China Geological Exploration Bureau Chengde 067000 P. R. China
| | - Xudong Zhao
- State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University Tianjin 300072 P. R. China
| | - Daqing Fu
- 514 Brigade of North China Geological Exploration Bureau Chengde 067000 P. R. China
| | - Renliang Huang
- School of Marine Science and Technology, Tianjin University Tianjin 300072 P. R. China
| | - Xuehui Guo
- 514 Brigade of North China Geological Exploration Bureau Chengde 067000 P. R. China
| | - Rongxin Su
- State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Membrane Science and Desalination Technology, School of Chemical Engineering and Technology, Tianjin University Tianjin 300072 P. R. China
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Wang T, Qu H, Ravindra AV, Ma S, Hu J, Zhang H, Le T, Zhang L. Treatment of complex sulfur-containing solutions in ammonia desulfurization ammonium sulfate production by ultrasonic-assisted ozone technology. ULTRASONICS SONOCHEMISTRY 2023; 95:106386. [PMID: 37003211 PMCID: PMC10457592 DOI: 10.1016/j.ultsonch.2023.106386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 03/10/2023] [Accepted: 03/23/2023] [Indexed: 06/19/2023]
Abstract
In this work, the cause of abnormal color in ammonium sulfate products formed by flue gas desulfurization is revealed by investigating the conversion relationship between different sulfur-containing ions and their behavior in a sulfuric acid medium. Both thiosulfate (S2O32-) and sulfite (SO32- & HSO3-) impurities affect the quality of ammonium sulfate. The S2O32- is the main reason for the yellowing of the product due to the formation of sulfur impurities in concentrated sulfuric acid. To address the yellowing of ammonium sulfate products, a unified technology (US/O3), using ozone (O3) and ultrasonic waves (US) simultaneously, is exploited to remove both thiosulfate and sulfite impurities from the mother liquor. The effect of different reaction parameters on the degree of removal of thiosulfate and sulfite is investigated. The synergistic effect of ultrasound and ozone on ion oxidation is further explored and demonstrated by the comparative experiments with O3 and US/O3. Under the optimized conditions, the thiosulfate and sulfite concentration in the solution is 2.07 and 5.93 g/L, respectively, and the degree of removal is 91.39 and 90.83%, respectively. The product obtained after evaporation and crystallization is pure white and meets the national standard requirements for ammonium sulfate products. Under the same conditions, the US/O3 process has apparent advantages, such as saving reaction time compared with the O3 process alone. Introducing an ultrasonically intensified field improves the generation of oxidation radicals ·OH, 1O2, and ·O2- in the solution. Furthermore, the effectiveness of different oxidation components in the decolorization process is studied by adding other radical shielding agents using the US/O3 process supplemented with EPR analysis. The order of the different oxidation components is O3(86.04%) > 1O2(6.53%) > •OH(4.45%) > •O2-(2.97%) for the oxidation of thiosulfate, and it is O3(86.28%) > •OH(7.49%) > 1O2(4.99%) > •O2-(1.25%) for the oxidation of sulfite.
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Affiliation(s)
- Tian Wang
- State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
| | - Hongtao Qu
- Yunnan Chihong Zinc and Germanium Co., Ltd., Qujing 655011, Yunnan, China
| | - A V Ravindra
- Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, Tamilnadu 603203, India
| | - Shaobin Ma
- Yunnan Chihong Zinc and Germanium Co., Ltd., Qujing 655011, Yunnan, China
| | - Jue Hu
- State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
| | - Hong Zhang
- Yunnan Chihong Zinc and Germanium Co., Ltd., Qujing 655011, Yunnan, China
| | - Thiquynhxuan Le
- State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China.
| | - Libo Zhang
- State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan, China; Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China.
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6
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Deng M, Xiao Z, Li D, Zhu Q, Chen Q, Wu S. Simultaneous removal of NO, SO 2 and Hg 0 with the WDRMRS. ENVIRONMENTAL TECHNOLOGY 2023; 44:659-669. [PMID: 34657577 DOI: 10.1080/09593330.2021.1980831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 09/04/2021] [Indexed: 06/13/2023]
Abstract
Micro-nanobubbles can spontaneously generate hydroxyl free radicals (OH). Urea is a cheap reductant and can react with NOx species, and their products are nontoxic and harmless N2, CO2 and H2O. In this study, a Wet Direct Recycling Micro-nanobubble Flue Gas Multi-pollutants Removal System (WDRMRS) was developed for the simultaneous removal of NO, SO2 and Hg0. In this system, a micro-nanobubble generator (MNBG) was used to produce a micro-nanobubble gas-liquid dispersion system (MNBGLS) through recycling the urea solution from the reactor and the simulated flue gas composed of N2, NO, SO2 and Hg0. The MNBGLS, which has a large gas-liquid dispersion interface, was recycled continuously from the MNBG to the reactor, thus achieving cyclic absorption of various pollutants. All of the investigated parameters, including the initial pH and temperature of the absorbent as well as the concentrations of urea, NO and SO2 had significant effects on the NO removal efficiency but did not significantly affect the SO2 removal efficiency, whereas only the initial solution pH and NO concentration affected the Hg0 removal efficiency. The analysis results of the reaction mechanism showed that ·OH played a critical role in the removal of various pollutants. After the treatment by this system, the main removal products were Hg0 sediment, SO42- and NH4+ which could be easily recycled. The use of this system (MNBGLS) for the simultaneous removal of NO, SO2 and Hg0 is a new technology application and research. Recycling process based on MNBGLS succeeded in simultaneously removing NO, SO2 and Hg0. The system (MNBGLS) can provide a reference for commercial applications. The removal products are relatively simple and beneficial to recycling, which can reduce the cost of waste gas treatment.
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Affiliation(s)
- Mingqiang Deng
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Zhengguo Xiao
- Shanghai Textile Research Institute Co. Ltd, Shanghai, People's Republic of China
| | - Dengxin Li
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
| | - Qiaoling Zhu
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Qin Chen
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
| | - Sicheng Wu
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
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Removal of nitric oxide from simulated flue gas using aqueous persulfate with activation of ferrous ethylenediaminetetraacetate in the rotating packed bed. Front Chem Sci Eng 2023. [DOI: 10.1007/s11705-022-2224-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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8
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Simultaneous oxidation absorption of NO and Hg0 using biomass carbon- activated Oxone system under synergism of high temperature. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Chen H, Lu Z, Chen Y, Wu S, Zheng J, Qian Z. Advanced Oxidant Process with Fe(II)-Catalyzed Alkaline H 2O 2 Systems for Highly Efficient Concurrent Scavenging of NO and SO 2 in High Gravitational Fields. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hongyu Chen
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing100049, China
- Weiqiao-UCAS Research Institute, Huanghe 8th Road, Bingzhou256600, Shangdong, China
| | - Zhicheng Lu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing100049, China
| | - Yang Chen
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing100049, China
| | - Shao Wu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing100049, China
| | - Jianzhong Zheng
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing100049, China
| | - Zhi Qian
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing100049, China
- Weiqiao-UCAS Research Institute, Huanghe 8th Road, Bingzhou256600, Shangdong, China
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10
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Sun S, Zhang J, Sheng C, Zhong H. The removal of NO from flue gas by NaOH-catalyzed H 2O 2 system: Mechanism exploration and primary experiment. JOURNAL OF HAZARDOUS MATERIALS 2022; 440:129788. [PMID: 35988485 DOI: 10.1016/j.jhazmat.2022.129788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/19/2022] [Accepted: 08/14/2022] [Indexed: 06/15/2023]
Abstract
Currently, most advanced oxidation denitrification technologies require long flue gas residence time to obtain ideal NO removal efficiency. The NaOH-catalyzed H2O2 system proposed in this paper can obtain 98% NO removal efficiency under the condition of flue gas residence time of 3 s. The mechanism of NO removal and H2O2 decomposition to O2 were proposed. It was confirmed with ESR (Electron-spin-resonance), inhibitor experiments and UV-Vis spectrophotometer that the main group in the reaction process was·O2- radicals, which reacted with NO to form ONOO-, and ONOO- would be gradually transformed into NO3- and NO2- in the air. The effect of some primary factors on the NO removal efficiency and the percentage of H2O2 decomposition to O2 were also investigated. The increase of initial pH has a positive effect on NO removal, while the promotion of NO removal by increasing H2O2 concentration and reaction temperature is limited and the increase of NO has a negative effect on NO removal. Initial pH has a dual impact on the percentage of H2O2 decomposition to O2, H2O2 concentration and reaction temperature promote the decomposition of H2O2 to O2, while NO concentration has an inhibiting effect on it.
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Affiliation(s)
- Shujun Sun
- Department of Energy and Environment, Southeast University, Nanjing, 210096 Jiangsu, China
| | - Jun Zhang
- Department of Energy and Environment, Southeast University, Nanjing, 210096 Jiangsu, China.
| | - Changdong Sheng
- Department of Energy and Environment, Southeast University, Nanjing, 210096 Jiangsu, China
| | - Hui Zhong
- Department of Energy and Environment, Southeast University, Nanjing, 210096 Jiangsu, China
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11
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Purification Technologies for NOx Removal from Flue Gas: A Review. SEPARATIONS 2022. [DOI: 10.3390/separations9100307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Nitrogen oxide (NOx) is a major gaseous pollutant in flue gases from power plants, industrial processes, and waste incineration that can have adverse impacts on the environment and human health. Many denitrification (de-NOx) technologies have been developed to reduce NOx emissions in the past several decades. This paper provides a review of the recent literature on NOx post-combustion purification methods with different reagents. From the perspective of changes in the valence of nitrogen (N), purification technologies against NOx in flue gas are classified into three approaches: oxidation, reduction, and adsorption/absorption. The removal processes, mechanisms, and influencing factors of each method are systematically reviewed. In addition, the main challenges and potential breakthroughs of each method are discussed in detail and possible directions for future research activities are proposed. This review provides a fundamental and systematic understanding of the mechanisms of denitrification from flue gas and can help researchers select high-performance and cost-effective methods.
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12
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Yan S, Jiang Y, Chen X, Zhou T. Improved Advanced Oxidation Process for In Situ Recycling of Al Foils and Cathode Materials from Spent Lithium-Ion Batteries. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shuxuan Yan
- Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China
| | - Youzhou Jiang
- Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China
| | - Xiangping Chen
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, P.R. China
| | - Tao Zhou
- Hunan Provincial Key Laboratory of Chemical Power Sources, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P.R. China
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13
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Sun S, Zhang J, Sheng C, Zhong H. Experimental Study on the Removal of NO from Coal-Fired Flue Gas by the Na 2SiO 3/Fenton System. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shujun Sun
- Department of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
| | - Jun Zhang
- Department of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
| | - Changdong Sheng
- Department of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
| | - Hui Zhong
- Department of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
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14
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Liu A, Wang L, Wu J, Xiao L, Jiang X, Wang L, Ma L, Wang H. Simultaneous Removal of SO 2 and NO from the Flue Gas of Marine Ships with a Gas Cyclone–Liquid Jet Absorption Separator. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01852] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anlin Liu
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
| | - Liwang Wang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Jiwei Wu
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
| | - Lingyu Xiao
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Xia Jiang
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
| | - Lina Wang
- Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
| | - Liang Ma
- National Engineering Research Center for Flue Gas Desulfurization, Sichuan University, Chengdu 610065, China
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Hualin Wang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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15
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Chen X, Tong X, Gao J, Yang L, Ren J, Yang W, Liu S, Qi M, Crittenden J, Hao R. Simultaneous Nitrite Resourcing and Mercury Ion Removal Using MXene-Anchored Goethite Heterogeneous Fenton Composite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:4542-4552. [PMID: 35316022 DOI: 10.1021/acs.est.2c00786] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The integrated system of gas-phase advanced oxidation process combined with sulfite-based wet absorption process is a desirable method for simultaneous removal of SO2, NO, and Hg0, but due to the enrichment of nitrite and Hg2+, resourcing harmless wastewater is still a challenge. To tackle this problem, this study fabricated a bifunctional β-FeOOH@MXene heterogeneous Fenton material, of which the crystalline phase, morphology, structure, and composition were revealed by using X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy-energy dispersive x-ray spectroscopy, and transmission electron microscopy. It exhibits excellent performance on nitrite oxidation (99.5%) and Hg2+ removal (99.7%) and can maintain stable outstanding ability after 13 cycles, with superior Hg2+ adsorption capacity (395 mg/g) and ultralow Fe leaching loss (<0.018 wt %). The synergism between MXene and β-FeOOH appears as follows: (i) MXene, as an inductive agent, directionally converted Fe2O3 into β-FeOOH in the hydrothermal method and greatly reduced its monomer size; (ii) the introduced ≡Ti(III)/≡Ti(II) accelerated the regeneration of ≡Fe(II) via rapid electron transfer, thereby improving the heterogeneous Fenton reaction; and (iii) MXene strongly immobilized β-FeOOH to greatly inhibit Fe-leaching. HO•, •O2--, and 1O2 were the main radicals identified by electron spin resonance. Radical quenching tests showed their contributions to NO2- oxidation in the descending order HO• > 1O2 > •O2-. Quantum chemical calculations revealed that •OH-induced oxidation of NO2- or HNO2 was the primary reaction path. Density functional theory calculations combined with X-ray photoelectron spectroscopy and Raman characterizations displayed the Hg2+ removal mechanism, with Hg2Cl2, HgCl2, and HgO as the main byproducts. This novel material provides a new strategy for resourcing harmless wastewater containing nitrite and Hg2+.
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Affiliation(s)
- Xi Chen
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Xin Tong
- Brook Byer Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Jiabin Gao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Lijuan Yang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Jianuo Ren
- Department of Energy & Power Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Weijie Yang
- Department of Energy & Power Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Su Liu
- Brook Byer Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Meng Qi
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - John Crittenden
- Brook Byer Institute for Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Runlong Hao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
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16
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Li H, Zhao W, Wu L, Wang Q, Shang D, Zhong Q. Boosting low-temperature selective catalytic reduction of NO with NH3 of V2O5/TiO2 catalyst via B-doping. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2021.04.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Zhang Z, Lin Y, Meng J, Wang L, Yao Q, Chen X, Dai G, Zhao Y, Hao R. Reaction Behavior and Influencing Mechanisms of Different Fly Ashes on the NO Removal by Using the Ultraviolet Irradiating Chlorite Method. ACS OMEGA 2022; 7:8739-8752. [PMID: 35309458 PMCID: PMC8928542 DOI: 10.1021/acsomega.1c06930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 02/23/2022] [Indexed: 06/14/2023]
Abstract
Our previous work had demonstrated that UV/NaClO2 was the best advanced oxidation method in terms of nitric oxide (NO) removal, but we have not studied the impact of the fly ash on NO removal under such conditions. For this, this paper selected six kinds of fly ashes and studied their effects on NO removal. The micromorphology, elemental composition, and the elemental oxidation states of these six fly ashes were characterized by scanning electron microscopy-energy-dispersive X-ray spectra, X-ray photoelectron spectroscopy, and inductively coupled plasma methods. The main inorganic components in the six fly ashes are metal oxides (Fe2O3/Fe3O4, SiO2, Al2O3, ZnO, MgO, and TiO2), carbonates (Na2CO3 and CaCO3), and chlorides (NaCl, KCl, and MgCl2). The experimental results suggested that high solubility was the premise condition for the fly ashes exhibiting an inhibitory effect on NO removal. Among all of the metal compounds, Fe2O3/Fe3O4 exhibited the highest inhibitory contribution rate to the NO removal (22.9-45.7%). The anions of Cl- and CO3 2- acted as scavengers for the free radicals which greatly impaired the oxidation of NO. Based on the simulation experimental results and the UV-vis analysis, the order of inhibitory contribution rates of various metal compounds to the NO removal was determined as Fe2O3/Fe3O4 > TiO2 ≈ Na2CO3 > Al2O3 ≈ ZnO ≈ MnO2 > CaCO3 > NaCl > KCl ≈ SiO2 ≈ MgCl2.
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Affiliation(s)
- Zili Zhang
- Fujian
Special Equipment Inspection and Research Institute, Fujian Boiler
& Pressure Vessel Inspection and Research Institute, National Industrial Boiler Quality Inspection Center
(Fujian), Fuzhou 350008, PR China
| | - Yao Lin
- Fujian
Special Equipment Inspection and Research Institute, Fujian Boiler
& Pressure Vessel Inspection and Research Institute, National Industrial Boiler Quality Inspection Center
(Fujian), Fuzhou 350008, PR China
| | - Jianwei Meng
- Hebei
Key Laboratory of Mineral Resources and Ecological Environment Monitoring, Baoding 071000, PR China
| | - Lei Wang
- Hebei
Key Laboratory of Mineral Resources and Ecological Environment Monitoring, Baoding 071000, PR China
| | - Qin Yao
- Fujian
Special Equipment Inspection and Research Institute, Fujian Boiler
& Pressure Vessel Inspection and Research Institute, National Industrial Boiler Quality Inspection Center
(Fujian), Fuzhou 350008, PR China
| | - Xiaohan Chen
- Fujian
Special Equipment Inspection and Research Institute, Fujian Boiler
& Pressure Vessel Inspection and Research Institute, National Industrial Boiler Quality Inspection Center
(Fujian), Fuzhou 350008, PR China
| | - Guodong Dai
- Fujian
Special Equipment Inspection and Research Institute, Fujian Boiler
& Pressure Vessel Inspection and Research Institute, National Industrial Boiler Quality Inspection Center
(Fujian), Fuzhou 350008, PR China
| | - Yi Zhao
- Hebei
Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department
of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Runlong Hao
- Hebei
Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department
of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
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18
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Nie Z, Li C, Tian S, Ning P, Yang D, Li Y. An insight into mineral waste pulp for sulfur dioxide removal: A novel synergy-coordination mechanism involving surfactant. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2021.119988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Wang D, Huang B, Shi Z, Long H, Li L, Yang Z, Dai M. Cu–Ni/AC Catalyst for Low-Temperature CO-Selective Catalytic Denitration Mechanism. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c02565] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Defu Wang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
- Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan Province, Kunming 650093, China
| | - Bangfu Huang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
- Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan Province, Kunming 650093, China
| | - Zhe Shi
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
- Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan Province, Kunming 650093, China
| | - Hongming Long
- Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Anhui University of Technology, Ministry of Education, Ma’anshan 243002, China
| | - Lu Li
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
- Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan Province, Kunming 650093, China
| | - Zhengyu Yang
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
- Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan Province, Kunming 650093, China
| | - Meng Dai
- Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
- Clean Metallurgy Key Laboratory of Complex Iron Resources, University of Yunnan Province, Kunming 650093, China
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20
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Tao L, Wang L, Zhou Y, Hu N, Cai J, Chen X, Wang X, Ning P. Removal of SO 2 from smelting flue gas by using copper tailings with MnSO 4: factors optimization by response surface methodology. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:48417-48426. [PMID: 33909244 DOI: 10.1007/s11356-021-13990-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 04/13/2021] [Indexed: 06/12/2023]
Abstract
The abatement of SO2 and the utilization of copper tailings are identified as two attention-attracting environmental issues in the copper smelter. In this study, to improve the flue gas desulfurization performance and the utilization of copper tailings, SO2 removal from smelting flue gas by using copper tailings combined with MnSO4·H2O was investigated. The effects of operation variables, including inlet SO2 concentration, absorption temperature, slurry concentration, and MnSO4·H2O amount, on the flue gas desulfurization performance were studied based on the response surface method. It was found that the effect of operation variables on SO2 removal follows the descending order: the inlet SO2 concentration, MnSO4·H2O concentration, absorbent temperature, and solid-liquid ratio. The interaction between the inlet SO2 concentration and MnSO4·H2O concentration is an important factor for breakthrough sulfur capacity. Elevated temperature and high initial SO2 concentration inhibited the efficient removal of SO2. Moreover, a proposed equation exhibits good consistency in the prediction for the breakthrough sulfur dioxide capacity. Therefore, the results can provide a reliable reference and basis for industrial application for flue gas desulfurization with copper tailings.
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Affiliation(s)
- Lei Tao
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Langlang Wang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Yangjie Zhou
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Ningmeng Hu
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Jun Cai
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Xiaoyu Chen
- Zhejiang Nanhua Anti-corrosion Equipment Co., Ltd., Hangzhou, 311255, China
| | - Xueqian Wang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China.
| | - Ping Ning
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
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21
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Huang Y, Yu X, Gan H, Jiang L, Gong H. Degradation and chlorination mechanism of fumaric acid based on SO 4•-: an experimental and theoretical study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:48471-48480. [PMID: 33907958 DOI: 10.1007/s11356-021-12756-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 01/27/2021] [Indexed: 06/12/2023]
Abstract
It is well known that chloride ions could affect the oxidation kinetics and mechanism of contaminant based on SO4•- in the wastewater. Here, the degradation of an organic acid, fumaric acid (FA), was investigated in the presence of chloride (0-300 mM) by the Fe(II)/peroxymonosulfate (Fe(II)/PMS) system. A negative impact of chloride was observed on the rates of FA degradation. The degree of inhibitory effect was higher in Fe(II)/PMS addition order. Some chlorinated byproducts were identified during the FA oxidation process in the presence of Cl- by the ultraperformance liquid chromatography and quadrupole-time of flight mass spectrometer (UPLC-QTOF-MS). With the increasing content of Cl-, an accumulation of adsorbable organic halogen (AOX), an increase in acute toxicity, and an inhibition of mineralization were observed. According to the results of kinetic modeling, the production and transformation of oxidative species were dependent on Cl- dosage and reaction time. SO4•- was supposed to be the main radical for FA degradation with Cl- concentration below 5 mM, whereas Cl2•- was primarily responsible for the depletion of FA at [Cl-] > 5 mM. A possible degradation pathway of FA was discussed. This study reveals the potential environmental risk of organic acid and is necessary to explore useful strategies for ameliorating the treatment of chloride-rich wastewater.
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Affiliation(s)
- Ying Huang
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, People's Republic of China.
| | - Xubiao Yu
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, People's Republic of China
| | - Huihui Gan
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, People's Republic of China
| | - Li Jiang
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, People's Republic of China
| | - Hancheng Gong
- School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, People's Republic of China
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22
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Liu Y, Liu L, Wang Y. A Critical Review on Removal of Gaseous Pollutants Using Sulfate Radical-based Advanced Oxidation Technologies. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:9691-9710. [PMID: 34191483 DOI: 10.1021/acs.est.1c01531] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Excessive emissions of gaseous pollutants such as SO2, NOx, heavy metals (Hg, As, etc.), H2S, VOCs, etc. have triggered a series of environmental pollution incidents. Sulfate radical (SO4•-)-based advanced oxidation technologies (AOTs) are one of the most promising gaseous pollutants removal technologies because they can not only produce active free radicals with strong oxidation ability to simultaneously degrade most of gaseous pollutants, but also their reaction processes are environmentally friendly. However, so far, the special review focusing on gaseous pollutants removal using SO4•--based AOTs is not reported. This review reports the latest advances in removal of gaseous pollutants (e.g., SO2, NOx, Hg, As, H2S, and VOCs) using SO4•--based AOTs. The performance, mechanism, active species identification and advantages/disadvantages of these removal technologies using SO4•--based AOTs are reviewed. The existing challenges and further research suggestions are also commented. Results show that SO4•--based AOTs possess good development potential in gaseous pollutant control field due to simple reagent transportation and storage, low product post-treatment requirements and strong degradation ability of refractory pollutants. Each SO4•--based AOT possesses its own advantages and disadvantages in terms of removal performance, cost, reliability, and product post-treatment. Low free radical yield, poor removal capacity, unclear removal mechanism/contribution of active species, unreliable technology and high cost are still the main problems in this field. The combined use of multiactivation technologies is one of the promising strategies to overcome these defects since it may make up for the shortcomings of independent technology. In order to improve free radical yield and pollutant removal capacity, enhancement of mass transfer and optimization design of reactor are critical issues. Comprehensive consideration of catalytic materials, removal chemistry, mass transfer and reactor is the promising route to solve these problems. In order to clarify removal mechanism, it is essential to select suitable free radical sacrificial agents, probes and spin trapping agents, which possess high selectivity for target specie, high solubility in water, and little effect on activity of catalyst itself and mass transfer/diffusion parameters. In order to further reduce investment and operating costs, it is necessary to carry out the related studies on simultaneous removal of more gaseous pollutants.
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Affiliation(s)
- Yangxian Liu
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Lei Liu
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Yan Wang
- School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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23
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Yuan P, Wang Z, Ahmad MS, Kong W, Ma J, Wang Z, Shen B, Ji Z. Enhanced oxidative removal of NO by UV/in situ Fenton: Factors, kinetics and simulation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 778:146202. [PMID: 34030361 DOI: 10.1016/j.scitotenv.2021.146202] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 02/08/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
A series of experiments on the oxidative removal of NO from flue gas using a novel in situ Fenton (IF) system was performed in the presence of ultraviolet light (UV). The comparison tests revealed that the in situ Fenton system facilitated by UV (UV/IF) has a better oxidation ability of NO than that of the IF system due to the photochemical effect on the generation of oxidative species like (OH). Both of the aforementioned oxidation efficiencies were higher than that of the conventional Fenton system (CF) depending on the premix of Fe2+ and H2O2 solutions, which attribute to the improvement of (OH) yield and valid utilization with continuous addition of fresh reagents and UV radiation. In follow-up experiments, the effects of UV power, gas flow rate, reagent temperature, Fe2+/H2O2 molar ratio, initial pH, initial concentration of NO and SO2 and volume fraction O2 and CO2 on the oxidative removal of NO by UV/IF method were investigated respectively. Moreover, the results of kinetic analysis indicated that NO oxidation was confirmed to have a pseudo-first-order kinetics pattern. The rate constants decreased slightly with increasing liquid temperature, and then the apparent activation energy of NO oxidation reactions in the UV/IF system was calculated as -5.62 kJ/mol by the Arrhenius equation. Furthermore, the reaction mechanism and application prospects concerning NO oxidative removal by using the UV/IF system was speculated in brief. Finally, the computational fluid dynamics (CFD) simulations revealed that the improvement of axial and radial gas hold-up would enhance the gas-liquid contact and accelerate the oxidation reactions on the interface. In addition to reasonable control of process parameters, the optimization of reactor interior structure needs to be carried out via CFD simulation and experimental validation in future research, both are favourable to promote the NO oxidation efficiency and large-scale development of this technology.
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Affiliation(s)
- Peng Yuan
- Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China; School of Chemical Engineering & Technology, Hebei University of Technology, Tianjin 300130, PR China
| | - Zhi Wang
- Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Muhammad Sajjad Ahmad
- Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Wenwen Kong
- Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Jiao Ma
- Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Zhuozhi Wang
- Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China
| | - Boxiong Shen
- Tianjin Key Laboratory of Clean Energy Utilization and Pollutants Control, School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300401, PR China.
| | - Zhiyong Ji
- School of Chemical Engineering & Technology, Hebei University of Technology, Tianjin 300130, PR China.
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24
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Sharif HMA, Mahmood N, Wang S, Hussain I, Hou YN, Yang LH, Zhao X, Yang B. Recent advances in hybrid wet scrubbing techniques for NO x and SO 2 removal: State of the art and future research. CHEMOSPHERE 2021; 273:129695. [PMID: 33524756 DOI: 10.1016/j.chemosphere.2021.129695] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Revised: 01/18/2021] [Accepted: 01/20/2021] [Indexed: 06/12/2023]
Abstract
Recently, the discharge of flue gas has become a global issue due to the rapid development in industrial and anthropogenic activities. Various dry and wet treatment approaches including conventional and hybrid hybrid wet scrubbing have been employing to combat against these toxic exhaust emissions. However, certain issues i.e., large energy consumption, generation of secondary pollutants, low regeneration of scrubbing liquid and high efficieny are hindering their practical applications on industrial level. Despite this, the hybrid wet scrubbing technique (advanced oxidation, ionic-liquids and solid engineered interface hybrid materials based techniques) is gaining great attention because of its low installation costs, simultaneous removal of multi-air pollutants and low energy requirements. However, the lack of understanding about the basic principles and fundamental requirements are great hurdles for its commercial scale application, which is aim of this review article. This review article highlights the recent developments, minimization of GHG, sustainable improvements for the regeneration of used catalyst via green and electron rich donors. It explains, various hybrid wet scrubbing techniques can perform well under mild condition with possible improvements such as development of stable, heterogeneous catalysts, fast and in-situ regeneration for large scale applications. Finally, it discussed recovery of resources i.e., N2O, NH3 and N2, the key challenges about several competitive side products and loss of catalytic activity over time to treat toxic gases via feasible solutions by hybrid wet scrubbing techniques.
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Affiliation(s)
| | - Nasir Mahmood
- School of Engineering, RMIT University, 124 La Trobe Street, 3001, Melbourne, Victoria, Australia
| | - Shengye Wang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, PR China
| | - Ijaz Hussain
- Faculty of Science, Universiti Teknologi Malaysia, UTM, 81310, Johor Bahru, Malaysia
| | - Ya-Nan Hou
- Tianjin Key Laboratory of Aquatic Science and Technology, School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, PR China
| | - Li-Hui Yang
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Xu Zhao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Bo Yang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, PR China.
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25
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Lee Y, Lee S, Cui M, Kim J, Ma J, Han Z, Khim J. Improving sono-activated persulfate oxidation using mechanical mixing in a 35-kHz ultrasonic reactor: Persulfate activation mechanism and its application. ULTRASONICS SONOCHEMISTRY 2021; 72:105412. [PMID: 33316732 PMCID: PMC7803812 DOI: 10.1016/j.ultsonch.2020.105412] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/11/2020] [Accepted: 11/19/2020] [Indexed: 05/03/2023]
Abstract
This study investigated the degradation of ibuprofen (IBP), an activated persulfate (PS), when subjected to ultrasonic (US) irradiation and mechanical mixing (M). The effects of several critical factors were evaluated, including the effect of rpm on M, PS concentration, and initial pH, and that of temperature on IBP degradation kinetics and the PS activation mechanism. The resulting IBP oxidation rate constant was significantly higher at 400 rpm. As the PS load increased, the IBP oxidation rate constant increased. The value of the IBP reaction rate increased with decreasing pH; below pH 4.9, there was no significant difference in the IBP oxidation rate constant. The IBP oxidation activation energy when using the US/M-PS system was 18.84 kJ mol-1. In the US/M-PS system, PS activation was the primary effect of temperature at the interface during the explosion of cavitation bubbles. These encouraging results suggest that the US-PS/M process is a promising strategy for the treatment of IBP-based water pollutants.
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Affiliation(s)
- Yonghyeon Lee
- School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Seojoon Lee
- School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Mingcan Cui
- School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
| | - Jeonggwan Kim
- Korea Environmental Industry and Technology, 215 Jinheung-no, Eunpyeong-gu, Seoul 03367, Republic of Korea
| | - Junjun Ma
- Nanjing Green-water Environment Engineering Limited by Share Ltd, C Building No. 606 Ningliu Road, Chemical Industrial Park, Nanjing, China
| | - Zhengchang Han
- Nanjing Green-water Environment Engineering Limited by Share Ltd, C Building No. 606 Ningliu Road, Chemical Industrial Park, Nanjing, China
| | - Jeehyeong Khim
- School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea.
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26
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Li Z, Zhuang T, Dong J, Wang L, Xia J, Wang H, Cui X, Wang Z. Sonochemical fabrication of inorganic nanoparticles for applications in catalysis. ULTRASONICS SONOCHEMISTRY 2021; 71:105384. [PMID: 33221623 PMCID: PMC7786602 DOI: 10.1016/j.ultsonch.2020.105384] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/21/2020] [Accepted: 10/27/2020] [Indexed: 05/04/2023]
Abstract
Catalysis covers almost all the chemical reactions or processes aiming for many applications. Sonochemistry has emerged in designing and developing the synthesis of nano-structured materials, and the latest progress mainly focuses on the synthetic strategies, product properties as well as catalytic applications. This current review simply presents the sonochemical effects under ultrasound irradiation, roughly describes the ultrasound-synthesized inorganic nano-materials, and highlights the sonochemistry applications in the inorganics-based catalysis processes including reduction, oxidation, degradation, polymerization, etc. Or all in all, the review hopes to provide an integrated understanding of sonochemistry, emphasize the great significance of ultrasound-assisted synthesis in structured materials as a unique strategy, and broaden the updated applications of ultrasound irradiation in the catalysis fields.
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Affiliation(s)
- Zhanfeng Li
- College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center, Qingdao University, 266071 Qingdao, China
| | - Tingting Zhuang
- College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center, Qingdao University, 266071 Qingdao, China
| | - Jun Dong
- College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center, Qingdao University, 266071 Qingdao, China
| | - Lun Wang
- College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center, Qingdao University, 266071 Qingdao, China
| | - Jianfei Xia
- College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center, Qingdao University, 266071 Qingdao, China
| | - Huiqi Wang
- College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center, Qingdao University, 266071 Qingdao, China
| | - Xuejun Cui
- College of Chemistry, Jilin University, 130012 Changchun, China
| | - Zonghua Wang
- College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Instrumental Analysis Center, Qingdao University, 266071 Qingdao, China.
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Si M, Shen B, Adwek G, Xiong L, Liu L, Yuan P, Gao H, Liang C, Guo Q. Review on the NO removal from flue gas by oxidation methods. J Environ Sci (China) 2021; 101:49-71. [PMID: 33334538 DOI: 10.1016/j.jes.2020.08.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 08/04/2020] [Accepted: 08/05/2020] [Indexed: 06/12/2023]
Abstract
Due to the increasingly strict emission standards of NOx on various industries, many traditional flue gas treatment methods have been gradually improved. Except for selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) methods to remove NOx from flue gas, theoxidation method is paying more attention to NOx removal now because of the potential to simultaneously remove multiple pollutants from flue gas. This paper summarizes the efficiency, reaction conditions, effect factors, and reaction mechanism of NO oxidation from the aspects of liquid-phase oxidation, gas-phase oxidation, plasma technology, and catalytic oxidation. The effects of free radicals and active components of catalysts on NO oxidation and the combination of various oxidation methods are discussed in detail. The advantages and disadvantages of different oxidation methods are summarized, and the suggestions for future research on NO oxidation are put forward at the end. The review on the NO removal by oxidation methods can provide new ideas for future studies on the NO removal from flue gas.
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Affiliation(s)
- Meng Si
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Boxiong Shen
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China.
| | - George Adwek
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China; Department of Energy and Environmental Engineering, Mount Kenya University, Thika, Kenya
| | - Lifu Xiong
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Lijun Liu
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Peng Yuan
- Tianjin Key Laboratory of Clean Energy and Pollutant Control, School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin300401, China
| | - Hongpei Gao
- China Huaneng Group Clean Energy Technology Research Institute Co. Ltd., Beijing 102209, China
| | - Cai Liang
- Chengdu Dongfang KWH Environmental Protection Catalysts Co. Ltd., Chengdu 610042, China
| | - Qihai Guo
- TUS Environmental Science and Technology Development Co. Ltd., Yichang 443000, China
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Liu X, Wang C, Zhu T, Lv Q, Che D. Simultaneous removal of SO 2 and NO x with OH from the catalytic decomposition of H 2O 2 over Fe-Mo mixed oxides. JOURNAL OF HAZARDOUS MATERIALS 2021; 404:123936. [PMID: 33070004 DOI: 10.1016/j.jhazmat.2020.123936] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 08/14/2020] [Accepted: 09/02/2020] [Indexed: 06/11/2023]
Abstract
In this paper, the simultaneous removal of SO2 and NOx catalyzed by Fe-Mo mixed oxides at varying Mo/Fe atomic ratios was reported for the first time with the aim of reducing H2O2 consumption and elucidating the roles of Fe and Mo species in the catalytic process. Fe-Mo mixed oxides with varying Mo/Fe atomic ratios were synthesized and the catalytic performances were systematically studied. The catalyst with Mo/Fe atomic ratio of 2.0 exhibited the highest activity, with which removal efficiencies of 89.4 % for NOx and 100 % for SO2 can be attained at extremely low H2O2 dosage. Products analysis revealed that SO2 was mainly removed via wet scrubber, while the adequate oxidation resulting from OH radicals was the prerequisite for NOx removal. The redox pair of Fe2+/Fe3+ played a significant role in decomposing H2O2, while Mo species had double effect on catalytic activity. Higher Mo content resulted in abundant oxygen vacancies and stronger surface acidity, which favored OH formation. However, the excessive Mo content involved severe surface Mo enrichment and remarkably reduced the active sites of Fe species. The H2O2/Fe-Mo catalyst system showed excellent stability and had a promising prospect for simultaneously removing SO2 and NOx in coal-fired flue gas.
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Affiliation(s)
- Xuan Liu
- State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, PR China
| | - Chang'an Wang
- State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, PR China
| | - Tao Zhu
- State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, PR China
| | - Qiang Lv
- State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, PR China
| | - Defu Che
- State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, PR China.
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Hu M, Zhu J, Zhou W. Synthesis of oxygen vacancy-enriched N/P co-doped CoFe 2O 4 for high-efficient degradation of organic pollutant: Mechanistic insight into radical and nonradical evolution. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 270:116092. [PMID: 33333407 DOI: 10.1016/j.envpol.2020.116092] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/20/2020] [Accepted: 11/13/2020] [Indexed: 06/12/2023]
Abstract
Oxygen vacancy-enriched N/P co-doped cobalt ferrite (NPCFO) was synthesized using ionic liquid as N and P sources, and then the catalytic performance and mechanism of NPCFO upon peroxymonosulfate (PMS) activation for the degradation of organic pollutants were investigated. The as-synthesized NPCFO-700 exhibited excellent catalytic performance in activating PMS, and the degradation rate constant of 4-chlorophenol (4-CP) increased with the increase of OV concentration in NPCFO-x. EPR analysis confirmed the existence of ·OH, SO4·-, and 1O2 in the NPCFO-700/PMS system, in which OV could induce the generation of 1O2 by PMS adsorption and successive capture, and also served as electronic transfer medium to accelerate the redox cycle of M2+/M3+ (M denotes Co or Fe) for the generation of radical to synergistically degrade organic pollutants. In addition, the contribution of free radical and nonradical to 4-CP degradation was observed to be strongly dependent on solution pH, and SO4·- was the major ROS in 4-CP degradation under acid and alkaline condition, while 1O2 was involved in the degradation of 4-CP under neutral condition due its selective oxidation capacity, as evidenced by the fact that such organic pollutants with ionization potential (IP) below 9.0 eV were more easily attacked by 1O2. The present study provided a novel insight into the development of transition metal-based heterogeneous catalyst containing massive OV for high-efficient PMS activation and degradation of organic pollutants.
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Affiliation(s)
- Mingzhu Hu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jinyi Zhu
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Wenjun Zhou
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China; The Key Laboratory of Organic Pollution Process and Control, Zhejiang Province, Hangzhou, Zhejiang 310058, China.
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Zhang Y, Zhang BT, Teng Y, Zhao J, Kuang L, Sun X. Activation of persulfate by core–shell structured Fe3O4@C/CDs-Ag nanocomposite for the efficient degradation of penicillin. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117617] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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31
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Ti3+ doped V2O5/TiO2 catalyst for efficient selective catalytic reduction of NOx with NH3. J Colloid Interface Sci 2021; 581:76-83. [DOI: 10.1016/j.jcis.2020.07.131] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 07/24/2020] [Accepted: 07/26/2020] [Indexed: 01/27/2023]
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32
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Jia J, Liu D, Wang S, Li H, Ni J, Li X, Tian J, Wang Q. Visible-light-induced activation of peroxymonosulfate by TiO2 nano-tubes arrays for enhanced degradation of bisphenol A. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117510] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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33
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Xi H, Zhou S, Zhou J, Zhang Z. A novel combined system using Na 2S 2O 8/urea to simultaneously remove SO 2 and NO in marine diesel engine exhaust. JOURNAL OF HAZARDOUS MATERIALS 2020; 399:123069. [PMID: 32937716 DOI: 10.1016/j.jhazmat.2020.123069] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/26/2020] [Accepted: 05/26/2020] [Indexed: 06/11/2023]
Abstract
The novel combined system using Na2S2O8/urea was used to simultaneously absorb nitric oxide and sulfur dioxide emissions from marine diesel engines as well as inhibit the formation of nitrate in cleaning wastewater to meet the increasingly stringent requirements of regulations. The influences of reaction temperature, Na2S2O8 concentration, urea concentration, SO2 concentration, NO concentration and pH value on SO2 removal efficiency, NO removal efficiency and nitrate concentration were investigated. The experimental results showed that different reaction temperatures had different influences on SO2 removal efficiency, NO removal efficiency and nitrate concentration. An increase in Na2S2O8 could improve the absorption of NO. The addition of urea could effectively improve the removal efficiency of NO and reduce the nitrate concentration. The removal efficiencies of 1000 ppm NO and 1000 ppm SO2 achieved 100 % with 0.2 mol/L Na2S2O8 and 2 mol/L urea at 70℃, and the nitrate content was 8.56 mg/L which was far lower than the regulatory requirement of 60 mg/L. The acidic condition (pH ≤ 5.5) not only facilitated the absorption of NO but also reduced the generation of nitrate. According to the experimental results, the novel combined system was promising to be applied to the control technology of marine diesel engine exhaust.
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Affiliation(s)
- Hongyuan Xi
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China
| | - Song Zhou
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China.
| | - Jinxi Zhou
- School of Ocean, Yantai University, Yantai, 264005, China.
| | - Zhao Zhang
- College of Power and Energy Engineering, Harbin Engineering University, Harbin, 150001, China
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34
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Xiao Z, Li D. Simultaneous removal of NO and SO 2 with a micro-bubble gas-liquid dispersion system based on air/H 2O 2/Na 2S 2O 8. ENVIRONMENTAL TECHNOLOGY 2020; 41:3573-3583. [PMID: 31050602 DOI: 10.1080/09593330.2019.1615134] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Accepted: 03/24/2019] [Indexed: 06/09/2023]
Abstract
A novel environment-friendly process was proposed to conduct the simultaneous removal of NO and SO2. In this process, a micro-bubble generator was utilized to generate the micro-bubble gas-liquid dispersion system (MBGLS) by inhaling mixed gas (NO, SO2 and/or air) and absorption liquid. The MBGLS was then sprayed into an oxidation absorption column reactor, in which NO and SO2 were oxidized and absorbed. As the additives, air, H2O2 and/or Na2S2O8 were brought into the MBGLS to investigate their effects on the simultaneous removal of NO and SO2. In addition, the effects of initial pH and temperature of the absorption liquid on the simultaneous removal of NO and SO2 were also explored. The performance of the MBGLS in removing NO and SO2 was excellent. Even if the MBGLS was composed of tap water, NO and SO2, the removal efficiencies of NO and SO2 respectively reached 78% and 94.4%. The additives significantly improved the removal performance of the MBGLS. Under the conditions of pH = 8 and room temperature and the addition of air, SO2 was removed completely and the NO removal efficiency reached 99.5% when Na2S2O8 to H2O2 molar ratio was 0.005/0.05. The effect of the absorbent temperature on the removal of NO and SO2 was insignificant. With the increase in pH, the removal of NO in both H2O2 aqueous solution and Na2S2O8 aqueous solution firstly increased and then decreased, but pH had no effect on the removal of SO2.
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Affiliation(s)
- Zhengguo Xiao
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
| | - Dengxin Li
- College of Environmental Science and Engineering, Donghua University, Shanghai, People's Republic of China
- State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, People's Republic of China
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35
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Shan Y, Liu Y, Li Y, Yang W. A review on application of cerium-based oxides in gaseous pollutant purification. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117181] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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36
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Chen H, Wang C, Zhang J, Shi Y, Liu Y, Qian Z. NO x attenuation in flue gas by •OH/SO 4•--based advanced oxidation processes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:37468-37487. [PMID: 32681339 DOI: 10.1007/s11356-020-09782-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 06/16/2020] [Indexed: 06/11/2023]
Abstract
The combustion of fossil fuels has resulted in rapidly increasing emissions of nitrogen oxide (NOx), which has caused serious human health and environmental problems. NO capture has become a research focus in gas purification because NO accounts for more than 90% of NOx and is difficult to remove. Advanced oxidation processes (AOPs), features the little secondary pollution and the broad-spectrum strong oxidation of hydroxyl radicals (•OH), are effective and promising strategies for NO removal from coal-fired flue gas. This review provides the state of the art of NO removal by AOPs, highlighting several methods for producing •OH and SO4•-. According to the main radicals responsible for NO removal, these processes are classified into two categories: hydroxyl radical-based AOPs (HR-AOPs) and sulfate radical-based AOPs (SR-AOPs). This paper also reviews the mechanisms of NO capture by reactive oxygen species (ROS) and SO4•- in various AOPs. A HiGee (high-gravity) enhanced AOP process for improving NO removal, characterized by intensified gas-liquid mass transfer and efficient micro-mixing, is then proposed and discussed in brief. We believe that this review will be useful for workers in this field. Graphical abstract.
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Affiliation(s)
- Hongyu Chen
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Cuicui Wang
- College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jiahao Zhang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yijie Shi
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yuexian Liu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi Qian
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.
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37
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Hao R, Luo Y, Qian Z, Ma Z, Ding Y, Gong Y, Wang Z, Zhao Y. Simultaneous removal of SO 2, NO and Hg 0 using an enhanced gas phase UV-AOP method. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 734:139266. [PMID: 32464380 DOI: 10.1016/j.scitotenv.2020.139266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 04/27/2020] [Accepted: 05/05/2020] [Indexed: 05/26/2023]
Abstract
The core for simultaneous removal of SO2, NO and Hg0 is the oxidation of NO and Hg0. Radical induced oxidation of NO and Hg0 is considered to be the most efficient method. We develop a novel gas phase advanced oxidation process (AOP) of UV-Heat/H2O2-NaClO2 to simultaneously remove SO2, NO and Hg0 due to a great synergism between H2O2 and NaClO2 under thermal and ultraviolet (UV) co-catalysis. The results indicated that the SO2 removal was always good, while the removal of NO and Hg0 was affected by NaClO2 and UV. Higher catalytic temperature and longer flue gas residence time favored the removal of NO and Hg0. The presence of SO2 and NO facilitated Hg0 removal. Kinetics analyses were conducted to provide the reaction rate of removal of NO and Hg0 under different conditions. X-ray photoelectron spectroscopy (XPS) revealed the product composition as Cl-, Hg2+, NO3- and SO42-. Electron spin resonance (ESR) tests confirmed the generation of HO. Cost analyses demonstrated the better cost performance of the proposed method compared to SCR-ACI combined method. HO and ClO2 were proved to be the main oxidant. The reaction mechanism for removal of NO and Hg0 by using UV-Heat/H2O2-NaClO2 were proposed finally.
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Affiliation(s)
- Runlong Hao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
| | - Yichen Luo
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Zhen Qian
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Zhao Ma
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Yuqiao Ding
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Yaping Gong
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Zheng Wang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Yi Zhao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
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38
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Abstract
The emission of untreated environmental harmful gases such as sulfur and nitrogen oxide (SOx and NOx) emissions is considered old fashioned, since industries are compelled by governments and legislations to meet the minimum threshold before emitting such substances into the atmosphere. Numerous research has been done and is ongoing to come up with both cost-effective equipment and regenerable catalysts that are adsorbent—or with enhanced sorption capacity—and with safer disposal methods. This work presents the general idea of a monolith/catalyst for environmental application and the technicality for improving the surface area for fast and efficient adsorption–desorption reactions. The chemical reactions, adsorption kinetics, and other properties, including deactivation, regeneration, and the disposal of a catalyst in view of environmental application, are extensively discussed.
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39
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Wet flue gas desulfurization using micro vortex flow scrubber: Characteristics, modeling and simulation. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116915] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Zhao J, Zhang G, He J, Wen Z, Li Z, Gu T, Ding R, Zhu Y, Zhu R. Effect of preparation and reaction conditions on the performance of In/H-Beta for selective catalytic reduction of NO x with CH 4. CHEMOSPHERE 2020; 252:126458. [PMID: 32199163 DOI: 10.1016/j.chemosphere.2020.126458] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 02/15/2020] [Accepted: 03/04/2020] [Indexed: 06/10/2023]
Abstract
In/H-Beta catalyst was prepared by optimizing the support, concentration of ion exchange liquid and calcination temperature to investigate the effects of synthesis conditions on catalytic activity of selective catalytic reduction of NOx with CH4. The results showed that the In/H-Beta catalyst exhibited the superior activity when concentration of exchange liquid was 0.033 M and calcination temperature was 500 °C, the NOx removal ratio could reach 97.6%. In addition, reaction conditions could affect the catalytic performance. When O2 concentration was 10%, CH4:NO ratio was no less than one, space velocity was lower than 23600 h-1 and NO initial concentration was no more than 700 ppm, In/H-Beta could exhibit superior catalytic activity. Moreover, the catalytic performances of In/H-Beta catalysts were discussed after enduring H2O or/and SO2. This novel strategy could open the door for selective catalytic reduction of NOx with CH4.
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Affiliation(s)
- Jiuhu Zhao
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Gaige Zhang
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Jiansheng He
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China; Shanxi Academy of Analytical Sciences, Taiyuan, 030006, PR China
| | - Zhengzhong Wen
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Zhi Li
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Tingkun Gu
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Ran Ding
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Yongji Zhu
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Rongshu Zhu
- Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China.
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41
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Kermani M, Farzadkia M, Morovati M, Taghavi M, Fallahizadeh S, Khaksefidi R, Norzaee S. Degradation of furfural in aqueous solution using activated persulfate and peroxymonosulfate by ultrasound irradiation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 266:110616. [PMID: 32392147 DOI: 10.1016/j.jenvman.2020.110616] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Revised: 04/06/2020] [Accepted: 04/12/2020] [Indexed: 06/11/2023]
Abstract
Furfural is a toxic compound that can cause many problems for human health and the environment. In this study, we addressed the degradation of furfural in aqueous solution using the activated persulfate (SPS) and peroxymonosulfate (PMS) through the ultrasonic (US) wave. Besides, the effect of various parameters (pH, oxidizing dose, initial furfural concentration, US frequency, Inorganic anions concentration, and scavenger) on SPS + US (SPS/US) and PMS + US (PMS/US) processes were examined. The results showed, in order to furfural removal, the US had excellent efficiency in activating SPS and PMS, as in SPS/US and PMS/US processes, 95.3% and 58.4% of furfural (at 25 mg/L concentration) was decomposed in 90 min, respectively. The furfural degradation rate increased with increasing oxidizing dose and US frequency in both SPS/US and PMS/US processes. Considering the synergistic effect, the best removal rate has occurred in the SPS/US process. In the SPS/US and PMS/US processes, furfural removal increased at natural pH (pH 7), and the presence of inorganic anions such as NO3- and Cl- had negative effects on furfural removal efficiency. Also CO32- and HCO3- acted as a radical scavenger in the SPS/US process but these anions in the PMS/US process produced more SO4-° radicals, and subsequently, they increased the furfural degradation rate. The results also showed that the predominant radical in the oxidation reactions is the sulfate radical. This study showed that the SPS/US and PMS/US processes are promising methods for degrading organic pollutants in the environment.
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Affiliation(s)
- Majid Kermani
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Mehdi Farzadkia
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Maryam Morovati
- Department of Environmental Sciences & Engineering, Faculty of Agriculture & Natural Resources, Ardakan University, P.O.Box 184, Ardakan, Iran; Medicinal and Industrial Plants Research Institute, Ardakan University, Ardakan, Iran
| | - Mahmoud Taghavi
- Department of Environmental Health Engineering, Gonabad University of Medical Sciences, Gonabad, Iran
| | - Saeid Fallahizadeh
- Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Razieh Khaksefidi
- Department of Environmental Health Engineering, Faculty of Health, Zahedan University of Medical Sciences, Zahedan, Iran
| | - Samira Norzaee
- Department of Environmental Health Engineering, Iranshahr University of Medical Sciences, Iranshahr, Iran.
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Lei Z, Hao S, Zhang L, Yang J, Yusu W. MnOx-CuOx cordierite catalyst for selective catalytic oxidation of the NO at low temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:23695-23706. [PMID: 32297112 DOI: 10.1007/s11356-020-08785-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
Low-value solid waste cordierite honeycomb ceramics were used as carrier of SCO denitration catalyst, and the active component was supported by the impregnation method to improve the performance of the catalyst. Firstly, the effect of calcination conditions on the denitration performance of the Mn-loaded cordierite catalyst was studied for the cordierite-loaded active component MnOX. Secondly, the preferred catalyst was reloaded with another active component to further improve its denitration performance; the bimetal ratios were affected by the denitration performance, which was, finally, characterized by XRD, XPS, and SEM. The result shows the following: (1) Mn-loaded cordierite prepared at 450 °C for 3 h has a good denitration effect; (2) the MnOX-CuOX/CR catalyst is superior to MnOX-FeOX/CR, MnOX-CoOX/CR, and MnOX-CeOX/CR; (3) the MnO2 crystal form in the single metal-supported catalyst plays a major role, and Cu2Mn3O8 in the bimetallic catalyst affects the performance and activity of the catalyst. Graphical abstract.
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Affiliation(s)
- Zhang Lei
- School of Geology and Environment, Xi'an University of Science and Technology, Xi'an, 710054, China.
- Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Natural Resources, Xi'an, 710021, China.
| | - Shu Hao
- School of Water Resources and Hydroelectric Engineering, Xi'an University of Technology, Xi'an, 710048, China
| | - Lei Zhang
- China National Heavy Machinery Research Institute Co., Ltd., Xi'an, 710032, China
| | - Jia Yang
- School of Geology and Environment, Xi'an University of Science and Technology, Xi'an, 710054, China
| | - Wang Yusu
- Shaanxi Weihe Ecological Zone Protection Center, Xi'an, 710004, China
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Xiao Z, Li D, Wang F, Sun Z, Lin Z. Simultaneous removal of NO and SO2 with a new recycling micro-nano bubble oxidation-absorption process based on HA-Na. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.116788] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Nie Y, Dai J, Hou Y, Zhu Y, Wang C, He D, Mei Y. An efficient and environmentally friendly process for the reduction of SO 2 by using waste phosphate mine tailings as adsorbent. JOURNAL OF HAZARDOUS MATERIALS 2020; 388:121748. [PMID: 31796367 DOI: 10.1016/j.jhazmat.2019.121748] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 11/10/2019] [Accepted: 11/22/2019] [Indexed: 06/10/2023]
Abstract
The emission of SO2 and the disposal of waste phosphate mine tailings are generally regarded as two major environmental issues in phosphorus chemical activities. In this paper, an environmentally friendly and efficient route for removing SO2 from phosphorus chemical processes by using waste phosphate mine tailings as adsorbent was proposed. It was indicated that the desulfurization performance of the waste phosphate mine tailings was better than that of its raw ore. The characterization analysis illustrated that higher content of CaMg(CO3)2 was shown on the waste phosphate mine tailings, which played a dominant role in determining the better desulfurization activity. In contrast, the accumulation of PO43- and H+ ions resulted from the dissolution of Ca5(PO4)3F on the raw ore caused negative effect on SO2 removal. In the typical desulfurization system, the produced sulfuric acid from desulfurization process was used to decompose phosphate mine tailings, and these spent tailings can be subsequently applied as raw materials for the production of phosphorus products. As a result, the present approach can achieve the dual goal of reducing the cost of desulfurization process and recycling the waste tailings, which is of great environmental and economic significance.
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Affiliation(s)
- Yunxiang Nie
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China
| | - Jinfeng Dai
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China
| | - Yidong Hou
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China
| | - Yuanzhi Zhu
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China
| | - Chi Wang
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China
| | - Dedong He
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China.
| | - Yi Mei
- Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China; Yunnan Provincial Key Laboratory of Energy Saving in Phosphorus Chemical Engineering and New Phosphorus Materials, Kunming, 650500, PR China; The Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming, 650500, PR China.
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Wang Z, Yang Y, Liu J, Liu F, Yan X. Experimental and Theoretical Insights into the Effect of Syngas Components on Hg0 Removal over CoMn2O4 Sorbent. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00251] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhen Wang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yingju Yang
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jing Liu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Feng Liu
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xuchen Yan
- State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Hao R, Mao X, Ma Z, Qian Z, Luo Y, Zhao X, Yuan B. Multi-air-pollutant removal by using an integrated system: Key parameters assessment and reaction mechanism. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 710:136434. [PMID: 31923700 DOI: 10.1016/j.scitotenv.2019.136434] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Revised: 12/21/2019] [Accepted: 12/29/2019] [Indexed: 06/10/2023]
Abstract
How to cost-efficiently and cooperatively remove SO2, NO and Hg0 in flue gas is a hot topic in the field of air pollution control. This work developed an integrated system that consists of a dual-absorption system and a vapor oxidation system, in which Na2CO3 and H2O2/Na2S2O8 were used as the absorbent and oxidant. The results indicated that the efficiencies of SO2 removal and NO conversion reached 99.5% and 93% respectively. Rising the vaporization temperature and decreasing the pH of H2O2/Na2S2O8 could facilitate the NO conversion. The spent Na2CO3 after desulfurization was demonstrated to be a good absorbent for NO2 removal. The best conditions of pH and temperatures for the dual-absorber were determined as 10/8 and 60/60 °C, respectively. The presence of 1000 mg/m3 SO2 and 300 mg/m3 NO favored the Hg0 removal. TMT-15, an organic sulfur compound, was demonstrated to be useful in retaining Hg2+, with an efficiency of 92%. According to the analyses of electron spin resonance (ESR), ion chromatography (IC), atom fluorescence spectrometry (AFS) and X-ray photoelectron spectroscopy (XPS), SO4- and HO were proved to be the key radicals, and the existing forms of N- and Hg- species in the product were identified as NaNO2/NaNO3 and HgCl2.
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Affiliation(s)
- Runlong Hao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
| | - Xingzhou Mao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China
| | - Zhao Ma
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Zhen Qian
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Yichen Luo
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China
| | - Xu Zhao
- Key Laboratory of Environmental Nanotechnoloy and Health Effects, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Bo Yuan
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, PR China.
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Li X, Wang Z, Shi H, Dai D, Zuo S, Yao C, Ni C. Full spectrum driven SCR removal of NO over hierarchical CeVO 4/attapulgite nanocomposite with high resistance to SO 2 and H 2O. JOURNAL OF HAZARDOUS MATERIALS 2020; 386:121977. [PMID: 31911381 DOI: 10.1016/j.jhazmat.2019.121977] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 12/17/2019] [Accepted: 12/24/2019] [Indexed: 06/10/2023]
Abstract
Removal of hazardous NO at low temperature via photo-assisted selective catalytic reduction (photo-SCR) strategy is promising, however fully harvesting of solar energy and achieving high SO2/H2O tolerance still remain a challenge. Herein, the phosphoric acid modified natural attapulgite(P-ATP) was employed as a matrix to immobilize CeVO4 by microwave hydrothermal method. Results show that P-ATP provides abundant active sites facilitating the in situ grow of CeVO4 nanorods on its surface which hierarchically construct a dendritic-like photocatalyst. The near-infrared (NIR) light is upconverted to visible and UV light through CeVO4 which not only broaden the absorption range of solar light, but also build Z-scheme heterostructure with P-ATP enhancing the redox potential of charge carriers. The CeVO4/P-ATP nanocomposite can reach as high as 92 % for NO conversion under full-spectrum solar irradiation, while retaining nearly 60 % conversion under NIR light. Moreover, the catalyst exhibits outstanding tolerance with SO2 and H2O due to the presence of Ce species which can prevent NH3 from being sulfated, while ATP prevent catalyst from being corroded by H2O. This work may open up a new window for full-spectrum driven SCR of NO based on cost-effective mineral catalyst.
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Affiliation(s)
- Xiazhang Li
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China; Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA; Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, 243002 Maanshan, PR China.
| | - Zhendong Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China
| | - Haiyang Shi
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China
| | - Da Dai
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China
| | - Shixiang Zuo
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China
| | - Chao Yao
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou 213164, PR China
| | - Chaoying Ni
- Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA.
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48
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Liu B, Xu X, Xue Y, Liu L, Yang F. Simultaneous desulfurization and denitrification from flue gas by catalytic ozonation combined with NH 3/(NH 4) 2S 2O 8 absorption: Mechanisms and recovery of compound fertilizer. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 706:136027. [PMID: 31855635 DOI: 10.1016/j.scitotenv.2019.136027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 11/28/2019] [Accepted: 12/07/2019] [Indexed: 05/24/2023]
Abstract
An integrated method of simultaneous desulfurization and denitrification from flue gas by catalytic ozonation combined with NH3/(NH4)2S2O8 absorption was developed for the first time. It consisted of two parts: (1) the catalytic ozonation of NO over FeOx/SAPO-34 to study the effects of the various influencing factors, and (2) the absorption-oxidation of NOx and SO2 induced by ozone combined with a NH3/(NH4)2S2O8 solution in a bubble column reactor. In Part 1, results showed that under the optimal condition of a molar ratio of 0.5 for O3/NO, a residence time of 3 s, a water vapor volume fraction of 4%, a NO initial concentration of 536 mg/m3, and a SO2 initial concentration of 343 mg/m3, the oxidation rate of NO was 55%. The characterizations of poisoned catalyst are briefly discussed. In Part 2, as the gas passed sequentially through the ozonizing reactor and the absorber (NH3/(NH4)2S2O8 solution of 0.8% ammonia and 0.2 mol/L (NH4)2S2O8), a NO conversion rate of approximately 92.6% and SO2 conversion rate of 100% were obtained. The pH of the NH3/(NH4)2S2O8 solution had a significant impact on the NO conversion. According to the analysis of the composition of products under different pHs, a mechanism of desulfurization and denitrification based on NH3/(NH4)2S2O8 solutions was proposed. The reaction product as a compound fertilizer contained up to 24.5% nitrogen.
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Affiliation(s)
- Bing Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering (China Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China
| | - Xiaochen Xu
- Key Laboratory of Industrial Ecology and Environmental Engineering (China Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China.
| | | | - Lifen Liu
- Key Laboratory of Industrial Ecology and Environmental Engineering (China Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China
| | - Fenglin Yang
- Key Laboratory of Industrial Ecology and Environmental Engineering (China Ministry of Education), School of Environmental Science and Technology, Dalian University of Technology, Linggong Road 2, Dalian 116024, China
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Yuan B, Mao X, Wang Z, Hao R, Zhao Y. Radical-induced oxidation removal of multi-air-pollutant: A critical review. JOURNAL OF HAZARDOUS MATERIALS 2020; 383:121162. [PMID: 31520933 DOI: 10.1016/j.jhazmat.2019.121162] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 08/14/2019] [Accepted: 09/04/2019] [Indexed: 05/21/2023]
Abstract
Sulfur dioxide (SO2), nitric oxide (NO) and elemental mercury (Hg0) are three common air pollutants in flue gas. SO2 and NO are the main precursors for chemical smog and Hg0 is a bio-toxicant for human. Cooperative removal of multi-air-pollutant in flue gas using radical-induced oxidation reaction is considered as one of the most promising methods due to the high removal efficiency, low cost and less secondary environmental impact. The common radicals used in air pollution control can be classified into four types: (1) hydroxyl radical (OH), (2) sulfate radical (SO4-), (3) chlorine-containing radicals (Cl, ClO2, ClO, HOCl-, etc.) and (4) ozone. This review summarizes the generation methods and mechanism of the four kinds of radicals, as well as their applications in the removal of multi-air-pollutant in flue gas. The reactivity, selectivity and reaction mechanism of the four kinds of radicals in multi-air-pollutant removal were comprehensively described. Finally, some future research suggestions on the development of new technique for cooperative removal of multi-air-pollutant in flue gas were provided.
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Affiliation(s)
- Bo Yuan
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Xingzhou Mao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China
| | - Zheng Wang
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, PR China
| | - Runlong Hao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China.
| | - Yi Zhao
- Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding, 071003, PR China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing, 102206, PR China.
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50
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Liu Y, Shan Y, Wang Y. Novel Simultaneous Removal Technology of NO and SO 2 Using a Semi-Dry Microwave Activation Persulfate System. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:2031-2042. [PMID: 31894977 DOI: 10.1021/acs.est.9b07221] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
As it has a simple system and a small floor area, flue gas simultaneous desulfurization and denitrification technology has a good development prospect, and related research has become a hot topic in the field of flue gas purification. In this work, a novel simultaneous removal technology of NO and SO2 from flue gas using a semi-dry microwave activation persulfate system was developed for the first time. A series of experiments and characterization analyses had been implemented to research the feasibility of this new flue gas purification technology. The oxidation products, free radicals, and mechanism of NO and SO2 simultaneous removal were revealed. The effect of the main technological parameters on NO and SO2 simultaneous removal was also studied. Relevant results demonstrated that an increase in the microwave radiation power, persulfate concentration, and O2 concentration enhanced NO and SO2 simultaneous removal. The increase of NO and SO2 concentrations weakened NO and SO2 simultaneous removal. The reagent dosage, pH value of the solution, and reaction temperature showed a dual influence on NO and SO2 simultaneous removal. Free-radical capture experiments revealed that both SO4-• and •OH that were produced by microwave activation of persulfate were the major active species and played very key roles in NO and SO2 simultaneous removal. The main products (sulfate and nitrate) and byproducts (NO2) in the tail gas were found. The process application and product post-treatment routes were also proposed. The result may provide the necessary inspiration and guidance for the development and application of microwave-activated advanced oxidation technology in the flue gas treatment area.
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Affiliation(s)
- Yangxian Liu
- School of Energy and Power Engineering , Jiangsu University , Zhenjiang , Jiangsu 212013 , China
| | - Ye Shan
- School of Energy and Power Engineering , Jiangsu University , Zhenjiang , Jiangsu 212013 , China
| | - Yan Wang
- School of Energy and Power Engineering , Jiangsu University , Zhenjiang , Jiangsu 212013 , China
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