1
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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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2
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Liu X, Geng R, Li B, Ning P, Zhu T. Sodium ascorbate as additive in red mud slurry for simultaneous desulfurization and denitrification: Insights into the multiple influence factors and reaction mechanism. CHEMOSPHERE 2022; 307:135683. [PMID: 35843437 DOI: 10.1016/j.chemosphere.2022.135683] [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: 01/09/2022] [Revised: 06/27/2022] [Accepted: 07/10/2022] [Indexed: 06/15/2023]
Abstract
Based on the ultra-low emission demand of SO2 and NOx in flue gas, a new absorption method was proposed to improve the desulfurization and denitrification efficiency and reduce the amount of ozone by using sodium ascorbate as an additive in red mud slurry. Compared with pure red mud slurry, the red mud (RM) + sodium ascorbate (SA) slurry significantly improved the denitrification efficiency from 24% to 84% and the desulfurization efficiency to 98%. Meanwhile, the effects of RM, SA concentration, reaction time and O3/NO molar ratio on desulfurization and denitrification efficiencies were studied. The results showed that the RM + SA composite slurry maintained high efficiencies of desulfurization and denitrification for 240 min under the optimized conditions. As an antioxidant, the introduction of SA inhibited the excessive oxidation of sulfite, and itself could easily react with NO2 through the redox reaction, greatly promoting the absorption of NO2. In addition, the reaction mechanism of the simultaneous removal of SO2 and NO2 by red mud and sodium ascorbic mixed slurry combined was proposed.
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Affiliation(s)
- Xiaolong Liu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China
| | - Ran Geng
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, China
| | - Bin Li
- 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
| | - Tingyu Zhu
- CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, Beijing, 100190, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
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3
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Yang J, Song L, Deng C, Sui H, Dionysiou DD, Han Z, Xu M, Pan X. A new multi-component marine exhaust cleaning method using combined hydrodynamic cavitation and chlorine dioxide. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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4
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Ma L, Li G, Wang Y, Chai S, Zhang G. Study on NO Removal Characteristics of the Fe(II)EDTA and Fe(II)PBTCA Composite System. ACS OMEGA 2022; 7:27918-27926. [PMID: 35990463 PMCID: PMC9386696 DOI: 10.1021/acsomega.2c01641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Fe2+ complexation wet denitrification technology has become a research hotspot. It is very important to achieve efficient regeneration of the absorbent and increase NO absorption in the Fe2+ complexation system. They are the key to the industrial application of the Fe2+ complexation absorption process. In this paper, 2-phosphonate-butane-1,2,4-tricarboxylic acid and ethylenediamine tetraacetic acid were used as ligands to prepare a composite system for the first time. The characteristics of NO removal were investigated under different temperatures, pHs, Fe2+ concentrations, O2 contents, NO concentrations, CO2 contents, and SO2 concentrations. Compared with the single ligand, the results show that the denitrification performance of the solution with a complex ligand is significantly improved. In this system, pH 9, 40 °C temperature, and 20 mmol/L Fe2+ concentration are the economic ideal conditions for NO removal. The system can realize simultaneous removal of NO and SO2, but SO2 in flue gas has a dual effect on the NO removal reaction.
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5
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Adewuyi YG, Arif Khan M. Modeling the Synchronous Absorption and Oxidation of NO and SO2 by Activated Peroxydisulfate in a Lab-scale Bubble Reactor. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121841] [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]
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6
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Li S, Huang W, Xu H, Liu K, Wang JN, Sun Y, Qu Z, Yan N. Enhanced simultaneous absorption of NO x and SO 2 in oxidation-reduction-absorption process with a compounded system based on Na 2SO 3. J Environ Sci (China) 2022; 111:1-10. [PMID: 34949339 DOI: 10.1016/j.jes.2021.03.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 03/02/2021] [Accepted: 03/04/2021] [Indexed: 06/14/2023]
Abstract
Oxidation of sulfite and competitive absorption existed in Na2SO3 solution for simultaneous removal of NOx and SO2, inhibited the long-term high-efficiency when used for practical applications. A matching strategy was developed to solve these problems. Antioxidants combination was used to retard the oxidation of antioxidant and enhance inhibition of S(IV) (tetravalent sulfur) oxidation. Hydroquinone (HQ) and sodium thiosulfate (ST) showed a positive synergistic effect on inhibition of S(IV) oxidation. When SO2 concentration was 500 and 2000 ppmV, the addition of 0.1 wt.% HQ and 1 wt.% ST decreased the percentage of S(IV) oxidized by oxygen by over 30% and 40%, respectively. Alkali (Na2CO3) alleviated the competitive absorption between NOx and SO2. Moreover, Na2CO3 exhibited an enhancement effect on the absorption of NOx and SO2 when coupled with anti-oxidants. While the increase of oxygen pressure accelerated the oxidation of S(IV), the anti-oxidants can retard the oxidation. The measurement of pH suggested the removal efficiency of NOx highly depended on SO32⁻ concentration rather than pH. The further investigation of the mechanism suggested the match effect was related to the interaction between ST and the intermediate product of HQ. The match strategy holds a potential for application of SO32⁻ to denitration.
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Affiliation(s)
- Sichao Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Wenjun Huang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Haomiao Xu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Kai Liu
- Jinan Motor Vehicle Pollution Prevention and Control Center (Jinan Ecological Environment Information Center), Jinan 250000, China
| | - Jia-Nan Wang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yaning Sun
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zan Qu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Naiqiang Yan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
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7
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Genç N, Durna E, Kacıra E. The preference of the most appropriate radical-based regeneration process for spent activated carbon by the PROMETHEE approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:5240-5255. [PMID: 34417697 DOI: 10.1007/s11356-021-15833-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 08/02/2021] [Indexed: 06/13/2023]
Abstract
In this study, regeneration of spent granular activated carbon (GAC) with reactive dye by hydroxyl and sulfate radical-based advanced oxidation processes (microwave (MW) +persulfate (PS)), (Fe(II)+ PS), and (O3 + H2O2) were evaluated. The adsorption of the dye to the GAC surface was characterized by chemisorption and Langmuir isotherm. Regeneration processes have been optimized by the response surface methodology to determine the operating conditions that will provide the highest adsorptive capacity. The optimum conditions of (MW + PS), (Fe (II) + PS), and (O3 + H2O2) processes were process PS anion of 45.52 g/L, pH of 11.4, MW power of 126 W, and duration of 14.56 min; Fe (II) of 3.58 g/L, PS anion of 73.5 g/L, duration of 59.8 min, and pH of 10.9; and H2O2 of 2.8 mole/L, flow rate of 8.14 mg ozone/L, duration of 32.8 min, and pH of 5.3, respectively. For (MW + PS), (Fe (II) + PS), and (O3 + H2O2) processes, the adsorptive capacity under optimum conditions was found as 4.36, 8.89, and 8.12 mg dye/g GAC, respectively. For (Fe (II) + PS) and (O3 + H2O2) processes, these values are approximately equal to the adsorptive capacity of raw GAC (8.01 mg dye/g GAC). The predicted values of the adsorption capacities by the obtained models were in good agreement with the actual experimental results. Preference Ranking Organization Method for Enrichment Evaluation approach was used in the preference of the appropriate regeneration process. The adsorptive capacity of regenerated GAC, operating cost of the regeneration process, change in the adsorptive capacity during the regeneration cycle, and carbon mass loss criteria were taken into account. The order of preference of regeneration processes was determined as (Fe (II) + PS)> (MW + PS)> (O3 + H2O2) considering all criteria.
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Affiliation(s)
- Nevim Genç
- Department of Environmental Engineering, Faculty of Engineering, Kocaeli University, 41380, Kocaeli, Turkey.
| | - Elif Durna
- Department of Environmental Engineering, Faculty of Engineering, Kocaeli University, 41380, Kocaeli, Turkey
| | - Esin Kacıra
- Department of Environmental Engineering, Faculty of Engineering, Kocaeli University, 41380, Kocaeli, Turkey
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8
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Nikzad S, Amooey AA, Alinejad-Mir A. High effective removal of diazinon from aqueous solutions using the magnetic tragacanth-montmorillonite nanocomposite: isotherm, kinetic, and mechanism study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:20426-20439. [PMID: 33405103 DOI: 10.1007/s11356-020-12238-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 12/25/2020] [Indexed: 06/12/2023]
Abstract
Health and environmental impact of pesticide contamination of groundwater has been reported repeatedly in many studies. The removal of diazinon from agricultural wastewater is still of great interest due to using widely in many developing countries. In the presented study, the magnetic tragacanth-montmorillonite nanocomposite was utilized as an adsorbent to remove diazinon from an aqueous solution. The adsorbent properties were characterized using FE-SEM, EDX, FTIR, XRD, BET, and VSM techniques. The influence of adsorbent dosage, pH, contact time, and initial concentration of diazinon was studied in a batch system. Different adsorption kinetics and isotherm models were used to describe the kinetic and equilibrium data. The results indicated that the adsorption kinetic was fitted better with a Elovich kinetic model, and the adsorption isotherm was well described by the Langmuir-Freundlich model, and the maximum adsorption capacity was 416 mg g-1. According to Weber and Morris's model and Boyd plot, the results demonstrated that the adsorption kinetic was controlled simultaneously by film diffusion and intraparticle diffusion. Besides, a thermodynamic study showed that the removal of diazinon is an endothermic process. Considering the results, magnetic tragacanth-montmorillonite nanoadsorbent has a high capability to remove diazinon from aqueous solution.
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Affiliation(s)
- Sadaf Nikzad
- Department of Chemical Engineering, University of Mazandaran, Babolsar, Iran
| | - Ali Akbar Amooey
- Department of Chemical Engineering, University of Mazandaran, Babolsar, Iran.
| | - Ali Alinejad-Mir
- Department of Chemical Engineering, University of Mazandaran, Babolsar, Iran
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9
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Chen X, Wang Y, Hu X. Novel strategy of using a C/C electrodes electro-activated peroxymonosulfate to remove NO from simulated flue gas. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.117859] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Ding J, Shen L, Yan R, Lu S, Zhang Y, Zhang X, Zhang H. Heterogeneously activation of H 2O 2 and persulfate with goethite for bisphenol A degradation: A mechanistic study. CHEMOSPHERE 2020; 261:127715. [PMID: 32717514 DOI: 10.1016/j.chemosphere.2020.127715] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/23/2020] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
Advanced oxidation processes (AOPs) based on the activation of hydrogen peroxide (H2O2) and persulfate (PS) by minerals have received increasing interest for environmental remediation. Herein, H2O2 and PS activation systems employing goethite as a catalyst were discovered for the rapid degradation of BPA with the generation of reactive oxidation species (ROS) and for the reduction of total organic carbon (TOC) in aqueous solutions. The morphology of goethite were characterized by XRD, SEM, BET, TEM, etc. As a result, the oxidant efficiency of the goethite/H2O2 system (75.9%) was higher than that of the goethite/PS system (61.4%) after 240 min due to the restricted radical scavenging. According to the results of electron paramagnetic resonance (EPR) and radical quenching experiments, the main active ROS during the BPA degradation process were OH and SO4-. The two reaction systems were all pH-dependent that BPA can be effectively degraded in the goethite/PS system under acidic, neutral and weakly alkaline conditions, while the most inefficient degradation under alkaline conditions in the goethite/H2O2 system. Moreover, goethite showed good structural stability in the two systems. Several reaction products were detected using LC-MS, and the mechanisms for three systems were proposed. Density functional theory (DFT) was employed to study the conceivable degradation pathways of BPA in the two processes. This work reveals novel mechanistic insights regarding H2O2 and PS activation over goethite and implies the great potential application of the PS/mineral process in water and wastewater treatment.
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Affiliation(s)
- Jiafeng Ding
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, China
| | - Lilai Shen
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, China
| | - Ruopeng Yan
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, China
| | - Shihuan Lu
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, China
| | - Yinan Zhang
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, China
| | - Xiaofang Zhang
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, China
| | - Hangjun Zhang
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 311121, China.
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11
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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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12
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Xu ZH, Xiao X, Jia Y, Fang P, Huang JH, Wu HW, Tang ZJ, Chen DY. Simultaneous Removal of SO 2 and NO by O 3 Oxidation Combined with Wet Absorption. ACS OMEGA 2020; 5:5844-5853. [PMID: 32226864 PMCID: PMC7097996 DOI: 10.1021/acsomega.9b04031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 03/03/2020] [Indexed: 06/10/2023]
Abstract
The effects of ozone concentration, NaOH concentration, type and concentration of additives, initial pH, temperature, and NO and SO2 concentration on simultaneous removal of NO and SO2 were studied through ozone oxidation combined with wet absorption. Results indicated that ozone concentration and the type and concentration of additives had the most significant effect on NO removal. The optimal ozone concentration was 250 ppm (NO/NO2 = 1), and the best additive was KMnO4. The removal efficiency of NO x was as high as 97.86% when NO/NO2 = 1, and the concentration of KMnO4 was 0.025 mol/L. Considering economic and other factors, the KMnO4 concentration was selected to be 0.006 mol/L. At this time, the removal efficiencies of NO x and SO2 were 81.35 and 100%, respectively. This method has potential application prospects for simultaneous removal of SO2 and NO in the industrial flue gas.
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Affiliation(s)
- Zheng-Hui Xu
- Guangzhou
Huake Environmental Protection Engineering CO., LTD, Guangzhou 510655, China
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
- Key
Laboratory of Poyang Lake Environment and Resource Utilization, Ministry
of Education, School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China
| | - Xiang Xiao
- Guangzhou
Huake Environmental Protection Engineering CO., LTD, Guangzhou 510655, China
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
| | - Yan Jia
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
| | - Ping Fang
- Guangzhou
Huake Environmental Protection Engineering CO., LTD, Guangzhou 510655, China
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
| | - Jian-Hang Huang
- Guangzhou
Huake Environmental Protection Engineering CO., LTD, Guangzhou 510655, China
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
| | - Hai-Wen Wu
- Guangzhou
Huake Environmental Protection Engineering CO., LTD, Guangzhou 510655, China
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
| | - Zi-Jun Tang
- Guangzhou
Huake Environmental Protection Engineering CO., LTD, Guangzhou 510655, China
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
| | - Dong-Yao Chen
- Guangzhou
Huake Environmental Protection Engineering CO., LTD, Guangzhou 510655, China
- South
China Institute of Environmental Sciences, Ministry of Ecology and
Environment, Guangzhou 510655, China
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13
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Wang Y, Han X, Liu Y. Removal of Carbon Monoxide from Simulated Flue Gas Using Two New Fenton Systems: Mechanism and Kinetics. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:10387-10397. [PMID: 31389232 DOI: 10.1021/acs.est.9b02975] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two novel removal processes of carbon monoxide using two new Fenton systems (i.e., Cu2+/Fe2+ and Mn2+/Fe2+ coactivated H2O2 systems) were developed. The effect of several process parameters (concentrations of H2O2, Fe2+, Cu2+, and Mn2+, reagent pH value, solution temperature, and simulated flue gas components) on CO removal was studied in a bubbling reactor. The mechanism and kinetics of CO removal were also revealed. Results show that adding Cu2+ or Mn2+ obviously enhances the removal process of CO in new Fenton systems. The measured results of free radical yield demonstrate that the enhancing role is derived from producing more ·OH (they are produced due to the synergistic activation role of Cu2+/Fe2+ or Mn2+/Fe2+ in new Fenton systems. The removal efficiency of CO is raised by increasing concentrations of Fe2+, Cu2+, and Mn2+ and is reduced by raising concentrations of CO, NO, and SO2. Increasing H2O2 concentration, reagent pH, and solution temperature demonstrates a dual impact on CO absorption. Three oxidation pathways are found to be responsible for CO removal in new Fenton systems. Results of mass-transfer reaction kinetics reveal that CO removal processes are located in a fast-speed reaction kinetics region (the CO removal process is controlled by the mass transfer rate).
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Affiliation(s)
- Yan Wang
- School of Energy and Power Engineering , Jiangsu University , Zhenjiang 212013 , China
| | - Xuan Han
- School of Energy and Power Engineering , Jiangsu University , Zhenjiang 212013 , China
| | - Yangxian Liu
- School of Energy and Power Engineering , Jiangsu University , Zhenjiang 212013 , China
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14
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Wei J, Gu J, Guo J, Li W, Wang C, Zhang J. Simultaneous removal of nitrogen oxides and sulfur dioxide using ultrasonically atomized hydrogen peroxide. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:22351-22361. [PMID: 31154651 DOI: 10.1007/s11356-019-05531-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 05/21/2019] [Indexed: 05/24/2023]
Abstract
A new method was developed for denitrification and desulfurization using hydrogen peroxide with the aid of an ultrasonic nebulizer to obtain high removal efficiency of NOx and SO2. Comparing with the atomizing nozzles having the aperture size of 0.01~0.02 mm, the droplets generated using the ultrasonic nebulizer show the smallest d50 value of 7.2 μm, with 72% possessing the size less than 10 μm. Based on the numerical simulation of the vaporization rate of droplets, it is indicated that the droplets with the size of 7.2 μm can be vaporized totally at very short residence time (0.11 s) under 130 °C. Effects of influence factors including the reaction temperature, the initial H2O2 concentration, pH value, and the flue gas flow rate were studied on the removal efficiencies of NO and SO2. Using the in-series double-oxidation subsystems with H2O2 concentration of 6 wt%, pH 5.0, and the reaction temperature of 130 °C, the removal efficiencies of SO2 and NO are respectively 100% and 89.3% at the short residence time of 1.8 s, and the removal efficiency of NO can be increased to 100% as the residence time is longer than 3.7 s. It is confirmed that the ultrasonically atomized H2O2 can indeed enhance the removal efficiencies of NO and SO2 at the optimal temperature, owing to the fast vaporization rate of fine droplets as well as the formation of more active radicals to be captured by NO and SO2 simultaneously. The results here provide a promising route to remove effectively the emissions of NO and SO2 simultaneously. Graphical abstract.
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Affiliation(s)
- Jiaqi Wei
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Junjie Gu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Junheng Guo
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Wei Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Chenglong Wang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China
| | - Jinli Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People's Republic of China.
- School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, 832003, People's Republic of China.
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15
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Zhao Y, Yuan B, Zheng Z, Hao R. Removal of multi-pollutant from flue gas utilizing ammonium persulfate solution catalyzed by Fe/ZSM-5. JOURNAL OF HAZARDOUS MATERIALS 2019; 362:266-274. [PMID: 30243249 DOI: 10.1016/j.jhazmat.2018.08.071] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 08/20/2018] [Accepted: 08/21/2018] [Indexed: 06/08/2023]
Abstract
A nano-sized iron loaded ZSM-5 zeolite (Fe/ZSM-5) catalyst was firstly used to activate (NH4)2S2O8 solution for the simultaneous removal of multi-pollutant from flue gas. The simultaneous removal efficiencies 100% of SO2, 72.6% of NO and 93.4% of Hg° were achieved under the condition that the catalyst dose was 0.8 g/L, concentration, pH and temperature of (NH4)2S2O8 solution were 0.03 mol/L, 5 and 65 °C, respectively. The stability of catalyst was checked by a continuous test, proving that the catalytic activity was maintained for 4 h and the leached iron reached low levels. Based on the catalyst characterizations, product analysis and literatures, the removal mechanism was speculated preliminarily, during which, OH and SO4- played key roles for oxidizing NO and Hg° into NO3- and Hg2+.
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Affiliation(s)
- Yi Zhao
- School of Environmental Science & Engineering, North China Electric Power University, Beijing 102206, People's Republic of China.
| | - Bo Yuan
- School of Environmental Science & Engineering, North China Electric Power University, Beijing 102206, People's Republic of China
| | - Zehui Zheng
- School of Environmental Science & Engineering, North China Electric Power University, Beijing 102206, People's Republic of China
| | - Runlong Hao
- School of Environmental Science & Engineering, North China Electric Power University, Beijing 102206, People's Republic of China
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