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Xie J, Yang C, Li X, Wu S, Lin Y. Generation and engineering applications of sulfate radicals in environmental remediation. CHEMOSPHERE 2023; 339:139659. [PMID: 37506891 DOI: 10.1016/j.chemosphere.2023.139659] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Revised: 07/20/2023] [Accepted: 07/25/2023] [Indexed: 07/30/2023]
Abstract
Sulfate radical (SO4•-)-based advanced oxidation processes (AOPs) have become promising alternatives in environmental remediation due to the higher redox potential (2.6-3.1 V) and longer half-life period (30-40 μs) of sulfate radicals compared with many other radicals such as hydroxyl radicals (•OH). The generation and mechanisms of SO4•- and the applications of SO4•--AOPs have been examined extensively, while those using sulfite as activation precursor and their comparisons among various activation precursors have rarely reviewed comprehensively. In this article, the latest progresses in SO4•--AOPs were comprehensively reviewed and commented on. First of all, the generation of SO4•- was summarized via the two activation methods using various oxidant precursors, and the generation mechanisms were also presented, which provides a reference for guiding researchers to better select two precursors. Secondly, the reaction mechanisms of SO4•- were reviewed for organic pollutant degradation, and the reactivity was systematically compared between SO4•- and •OH. Thirdly, methods for SO4•- detection were reviewed which include quantitative and qualitative ones, over which current controversies were discussed. Fourthly, the applications of SO4•--AOPs in various environmental remediation were summarized, and the advantages, challenges, and prospects were also commented. At last, future research needs for SO4•--AOPs were also proposed consequently. This review could lead to better understanding and applications of SO4•--AOPs in environmental remediations.
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Affiliation(s)
- Jun Xie
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
| | - Chunping Yang
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China; Academy of Environmental and Resource Sciences, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China; School of Environmental and Chemical Engineering, Nanchang Hangkong University, Nanchang, Jiangxi, 330063, China.
| | - Xiang Li
- Academy of Environmental and Resource Sciences, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China
| | - Shaohua Wu
- Academy of Environmental and Resource Sciences, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, Guangdong, 525000, China.
| | - Yan Lin
- College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, Hunan, 410082, China
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Liu J, Li C, Zhang X, Zhang H, Tang J, Dong Y. Modeling of NO mass transfer characteristics absorbed in sodium persulfate solution with a bubble reactor. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2023:1-9. [PMID: 37128141 DOI: 10.1080/10934529.2023.2206354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Sodium persulfate solution is considered as an effective wet denitrification medium, however, it is unclear that the influence of the operating conditions on mass transfer characteristics parameters during the absorption of NO with sodium persulfate solution. To determine the key mass transfer characteristics parameters, the specific interfacial area a and the mass transfer coefficients kL, kG, were determined based on the Danckwerts method during CO2 absorption in a bubble column. kL, kG and a were calculated by correlations between the mass transfer coefficients of NO and CO2. Results showed that the specific interfacial area increased 77.64 m-1, the liquid phase mass transfer coefficient increased 2.49 × 10-4 m·s-1, and the gas phase mass transfer coefficient increased 0.71 × 10-5 mol·Pa-1·s-1·m-2 with superficial gas velocity increasing from 0.6 to 1.4 L·min-1. With the temperature of sodium persulfate solution increasing from 293 to 333 K, the specific interfacial area decreased 42.66 m-1, while the liquid phase mass transfer coefficient and the gas phase mass transfer coefficient increased 3.89 × 10-4 m·s-1 and 1.18 × 10-5 mol·Pa-1·s-1·m-2, respectively. The experiments results determined the correlations of a, kL, and kG with the temperature of the absorption phase and the superficial velocity of the gas. It can serve as a guide to the enhancement of the sodium persulfate wet denitrification process.
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Affiliation(s)
- Jing Liu
- National Engineering Lab for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan, China
| | - Chang Li
- National Engineering Lab for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan, China
| | - Xiaoyang Zhang
- National Engineering Lab for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan, China
| | - Hao Zhang
- National Engineering Lab for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan, China
| | - Jiyun Tang
- National Engineering Lab for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan, China
- School of Energy and Control Engineering, Changji University, Changji, China
| | - Yong Dong
- National Engineering Lab for Coal-fired Pollutants Emission Reduction, Shandong University, Jinan, China
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3
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Wu J, Wang J, Liu C, Nie C, Wang T, Xie X, Cao J, Zhou J, Huang H, Li D, Wang S, Ao Z. Removal of Gaseous Volatile Organic Compounds by a Multiwalled Carbon Nanotubes/Peroxymonosulfate Wet Scrubber. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:13996-14007. [PMID: 36083161 DOI: 10.1021/acs.est.2c03590] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In this study, a wet scrubber coupled with a persulfate-based advanced oxidation process [carbocatalysts/peroxymonosulfate (PMS)] was demonstrated to efficiently remove gaseous volatile organic compounds (VOCs). The removal efficiency of a representative VOC, styrene, was stable at above 98%, and an average mineralization rate was achieved at 76% during 2 h. The removal efficiency of the carbocatalysts/PMS wet scrubber for styrene was much higher than that of pure water, carbocatalysts/water, or PMS/water systems. Quenching experiments, electron spin resonance spectroscopy, in-situ Raman spectroscopy and density functional theory (DFT) calculations indicated that singlet oxygen (1O2) and oxidative complexes are the main reactive oxygen species and that both contributed to styrene removal. In particular, carbonyl groups (C═O) in the carbocatalyst were found to be the active sites for activating PMS during styrene oxidation. The role of 1O2 was discovered to be benzene ring breaking and a possible non-radical oxidation pathway of styrene was proposed based on time-of-flight mass spectroscopy which was further verified by DFT calculations. In particular, the electron transfer process of multi world carbon nanotubes-PMS* in styrene oxidation was further studied in-depth by experiments and DFT calculations. The unstable vinyl on styrene was simultaneously degraded by the oxidative complexes and 1O2 into benzene, and finally oxidized by 1O2 into H2O and CO2. This study provides an effective method for VOC removal and clearly illustrates the complete degradation mechanism of styrene in a nonradical PMS-based process by a wet scrubber.
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Affiliation(s)
- Jieman Wu
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Jiangen Wang
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Chuying Liu
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Chunyang Nie
- School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China
| | - Teng Wang
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Xiaowen Xie
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Jiachun Cao
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Junhui Zhou
- Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, China
| | - Haibao Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China
| | - Didi Li
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
| | - Shaobin Wang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Zhimin Ao
- Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China
- Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China
- Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, China
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4
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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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5
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Li C, He L, Yao X, Yao Z. Recent advances in the chemical oxidation of gaseous volatile organic compounds (VOCs) in liquid phase. CHEMOSPHERE 2022; 295:133868. [PMID: 35131275 DOI: 10.1016/j.chemosphere.2022.133868] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/05/2022] [Accepted: 02/02/2022] [Indexed: 06/14/2023]
Abstract
The chemical oxidation of gaseous volatile organic compounds (VOCs) in liquid phase may possess great advantages in its high removal efficiency, mild conditions, good reliability, wide applicability, and little potential secondary pollution, which has aroused extensive research interests in the past decade. This Overview Article summarizes the latest achievements to eliminate VOCs by chemical oxidation in liquid phase including gas-liquid mass transfer, homogeneous/heterogeneous oxidation, electrochemical oxidation, and coupling technologies. Important research contributions are highlighted in terms of mass transfer, catalytic materials, removal/mineralization efficiency, and reaction mechanism to evaluate their potential industrial applications. The current challenges and future strategies are discussed from the viewpoint of the deep degradation of refractory VOC substrates and their intermediates. It is anticipated that this review will attract more attention toward the development and application of chemical oxidation methods to clear complex industrial organic exhaust gas.
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Affiliation(s)
- Changming Li
- School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China
| | - Li He
- School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China
| | - Xiaolong Yao
- School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China
| | - Zhiliang Yao
- School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China; State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing, 100048, China.
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6
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Tran T, Abrell L, Brusseau ML, Chorover J. Iron-activated persulfate oxidation degrades aqueous Perfluorooctanoic acid (PFOA) at ambient temperature. CHEMOSPHERE 2021; 281:130824. [PMID: 34044301 DOI: 10.1016/j.chemosphere.2021.130824] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/21/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
Perfluorooctanoic acid (PFOA, C8HF15O2) is an industrial surfactant that is highly resistant to natural breakdown processes such as those mediated by heat, hydrolysis, photolysis, and biodegradation. Many efforts have been developed to breakdown PFOA to less harmful species due to its widespread human exposure and potential toxicity. However, these methods require high temperature or specialized equipment with serious disadvantages of high energy cost for long-term use. We investigated the effectiveness of PFOA degradation by ferrous iron-activated persulfate oxidation (IAPO) under various aqueous geochemical conditions. Approximately 64% of PFOA (initial concentration = 1.64 μmol L-1) was degraded after 4 h under illuminated anoxic conditions at ambient temperature. This degradation rate and magnitude support the potential use of IAPO as a novel inexpensive and environmentally friendly method to remediate PFOA in soil and groundwater.
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Affiliation(s)
- Thien Tran
- Arizona Laboratory for Emerging Contaminants, The University of Arizona, Gould-Simpson Building #828 & 848, 1040 East 4th Street, Tucson, AZ, 85721, United States; Department of Environmental Science, The University of Arizona, 1177 E. 4th Street, P.O. Box 210038, Tucson, AZ, 85721, United States.
| | - Leif Abrell
- Arizona Laboratory for Emerging Contaminants, The University of Arizona, Gould-Simpson Building #828 & 848, 1040 East 4th Street, Tucson, AZ, 85721, United States; Department of Environmental Science, The University of Arizona, 1177 E. 4th Street, P.O. Box 210038, Tucson, AZ, 85721, United States.
| | - Mark L Brusseau
- Department of Environmental Science, The University of Arizona, 1177 E. 4th Street, P.O. Box 210038, Tucson, AZ, 85721, United States.
| | - Jon Chorover
- Arizona Laboratory for Emerging Contaminants, The University of Arizona, Gould-Simpson Building #828 & 848, 1040 East 4th Street, Tucson, AZ, 85721, United States; Department of Environmental Science, The University of Arizona, 1177 E. 4th Street, P.O. Box 210038, Tucson, AZ, 85721, United States.
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7
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Sun P, Hua Y, Zhao J, Wang C, Tan Q, Shen G. Insights into the mechanism of hydrogen peroxide activation with biochar produced from anaerobically digested residues at different pyrolysis temperatures for the degradation of BTEXS. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 788:147718. [PMID: 34022578 DOI: 10.1016/j.scitotenv.2021.147718] [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: 03/28/2021] [Revised: 05/06/2021] [Accepted: 05/08/2021] [Indexed: 06/12/2023]
Abstract
The disposal of large amounts of biogas residue from anaerobically digested waste is a burden on environment protection. Porous biochars (BCs) were synthesized from biogas residue at three pyrolysis temperatures (300 °C, 550 °C, and 800 °C) and used to catalyze H2O2 for the degradation of benzene, toluene, ethylbenzene, xylene isomers (ortho, para, and meta), and styrene (BTEXS) to develop a new use for biogas residues. The prepared BCs were characterized through scanning electron microscopy, Brunauer-Emmett-Teller method, Fourier transform infrared spectrometry, and X-ray photoelectron spectroscopy. Results showed that BC800/H2O2 had the highest BTEXS degradation performance over 6 h. The degradation kinetic data were most consistent with the pseudo-second-order model. The different catalytic effect of the three BCs pyrolyzed at different temperatures were attributed to the dominant active sites (C-O/C-OH/C=C/C=O groups, pyridinic N, and graphitic N) that induced the production of reactive oxygen species (ROS). ROS-quenching experiments indicated that the degradation of BTEXS by BC300/H2O2, BC550/H2O2, and BC800/H2O2 involved ∙OH, ∙O2-, and 1O2. ∙OH was the dominant ROS in BC300/H2O2 and BC550/H2O2, and 1O2 was the dominant ROS in BC800/H2O2. Our findings provided new insight into the different catalytic mechanisms for BC production at different pyrolysis temperatures and demonstrated that a porous BC catalyst with high utilization value could be prepared from biogas residue and could hold considerable potential for application in BTEXS treatment in the future.
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Affiliation(s)
- Peng Sun
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Yinfeng Hua
- Shanghai Liming Resources Reuse Co. Ltd., Shanghai 201209, PR China
| | - Jie Zhao
- Shanghai Pudong Agriculture Technology Extension Centre, Shanghai 201201, PR China
| | - Chen Wang
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Qiren Tan
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Guoqing Shen
- School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.
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8
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Dai Z, Li D, Ao Z, Wang S, An T. Theoretical exploration of VOCs removal mechanism by carbon nanotubes through persulfate-based advanced oxidation processes: Adsorption and catalytic oxidation. JOURNAL OF HAZARDOUS MATERIALS 2021; 405:124684. [PMID: 33307410 DOI: 10.1016/j.jhazmat.2020.124684] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 11/03/2020] [Accepted: 11/23/2020] [Indexed: 06/12/2023]
Abstract
Carbon-catalyzed persulfate activation for the removal of gaseous volatile organic compounds (VOCs) has not been reported yet, and the corresponding fundamental mechanisms of VOCs adsorption and the subsequent VOCs degradation remain controversial. In this work, theoretical chemistry calculations were carried out to explore the VOCs removal mechanism by the persulfate-based advanced oxidation processes (P-AOPs) for VOCs removal over single walled carbon nanotubes (SWCNT). This study provided detailed theoretical insights into the SWCNT/P-AOPs for VOCs treatment in terms of adsorption, activation, mineralization, and diffusion of VOCs or peroxymonosulfate (PMS). Various VOCs were found to be preferentially adsorbed onto SWCNT, and the adsorption strength of VOCs was found to be significantly dependent on their polarizability. On the other side, PMS adsorbed on SWCNT could be efficiently activated through accepting π electron in the sp2 carbon matrix of SWCNT rather than the electrons at dangling bonds to generate •OH radicals attributed to the strong interaction between PMS and SWCNT. Formaldehyde was then taken as an example to evaluate the catalytic degradation pathways via SWCNT/P-AOPs. Under the attack of •OH radicals, the ultrafast degradation pathway of formaldehyde with no byproduct CO was identified with ultralow reaction energy barrier and large energy release. In addition, factors affecting the adsorption of organic compounds were identified and the detailed PMS activation pathway was present directly in this work. Above all, this work extended the carbons/P-AOPs system to VOCs abatement and presented systematic evidences for the essential mechanisms associated with VOCs adsorption and PMS activation by SWCNT, and the corresponding removal pathway and mechanism were also understood.
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Affiliation(s)
- Zhenhua Dai
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 51006, China
| | - Didi Li
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 51006, China
| | - Zhimin Ao
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 51006, China.
| | - Shaobin Wang
- School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
| | - Taicheng An
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 51006, China
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9
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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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10
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Fedorov K, Plata-Gryl M, Khan JA, Boczkaj G. Ultrasound-assisted heterogeneous activation of persulfate and peroxymonosulfate by asphaltenes for the degradation of BTEX in water. JOURNAL OF HAZARDOUS MATERIALS 2020; 397:122804. [PMID: 32450502 DOI: 10.1016/j.jhazmat.2020.122804] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/25/2020] [Accepted: 04/25/2020] [Indexed: 05/23/2023]
Abstract
This study investigated - for the first time - the simultaneous degradation of benzene, toluene, ethylbenzene and o-xylene (BTEX) by persulfate (PS) and peroxymonosulfate (PMS) activated by asphaltenes (Asph) under ultrasound (US) irradiation. Advantageous properties such as high thermal stability, low production cost and extensive availability make asphaltenes as an appealing carbonaceous material for heterogeneous catalysis. The application of asphaltenes in PS/US increased the degradation of BTEXs from 31%, 34%, 35%, 32%-78%, 94%, 98% and 98%, while the removal of these compounds in PMS/US system was improved from 26%, 27%, 24%, 20%-76%, 91%, 97%, 97%, respectively. PS and PMS activation followed a typical sulfate-radical based advanced oxidation processes. In terms of activation of PS and PMS, the particles of asphaltenes intensified formation of reactive radicals by creating additional centers of cavitational events. Moreover, owing to π-π stacking interaction between asphaltenes and sp2-hybridized systems of BTEX, the contaminants undergo adsorption on the surface of asphaltenes and subsequent oxidation by formed radicals. The radical route of BTEX degradation in both PS/US/Asph and PMS/US/Asph systems was mainly contributed by sulfate (SO4•-) and hydroxyl radicals (HO•) and coexisting superoxide radical anions (O2•-) played a minor role.
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Affiliation(s)
- Kirill Fedorov
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233, Gdańsk, 11/12 Narutowicza Str., Poland
| | - Maksymilian Plata-Gryl
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233, Gdańsk, 11/12 Narutowicza Str., Poland
| | - Javed Ali Khan
- Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, 25120, Pakistan
| | - Grzegorz Boczkaj
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdańsk University of Technology, 80-233, Gdańsk, 11/12 Narutowicza Str., Poland.
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11
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Huang LW, Qiu PL, Chen JY, Chen AG, Liu YX. Removal of styrene in air stream by absorption combined with electrochemical oxidation. ENVIRONMENTAL TECHNOLOGY 2020; 41:2140-2145. [PMID: 30580665 DOI: 10.1080/09593330.2018.1556349] [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: 09/13/2018] [Accepted: 11/30/2018] [Indexed: 06/09/2023]
Abstract
Aqueous solution absorptions are widely used as an effective way for the treatment of noxious gases discharged from various industrial processes. However, this technology may encounter problems in removing gaseous pollutants with low Henry constants, such as styrene from contaminated air. In this study, a novel electrochemical absorption reactor was devised to remove these air pollutants. The reactor consists of five pairs of stacked mesh electrodes. Each pair of mesh electrodes consists of a Ti/RuO2 anode and a Ti cathode. The dimension of mesh electrode is 100 mm × 100 mm with 3 mm × 5 mm rhombic holes evenly distributed. The distance between two neighbouring electrodes is 25 mm. The simulated gas was introduced into the reactor from the bottom of the reactor by a gas distributor. The experimental result shows that styrene in the air was effectively removed by the electrochemical absorption reactor, and the removal increased with the increase of current density applied to the reactor. It was found that almost 100% styrene removal was achieved in 1% NaCl solution with 1 pH value and a current density of 0.04 A/cm2 applied to the reactor. The major liquid phase products from styrene oxidation were confirmed to be 1-Phenyl-1, 2-ethanediol and benzaldehyde.
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Affiliation(s)
- Li-Wei Huang
- College of Environmental, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Pan-Li Qiu
- College of Environmental, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Jin-Yuan Chen
- College of Environmental, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - An-Ge Chen
- College of Environmental, Zhejiang University of Technology, Hangzhou, People's Republic of China
| | - Ying-Xin Liu
- College of Environmental, Zhejiang University of Technology, Hangzhou, People's Republic of China
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12
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Adewuyi YG, Khan MA. Simultaneous NO and SO 2 removal by aqueous persulfate activated by combined heat and Fe 2+: experimental and kinetic mass transfer model studies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:1186-1201. [PMID: 29948722 DOI: 10.1007/s11356-018-2453-9] [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: 04/24/2018] [Accepted: 05/29/2018] [Indexed: 06/08/2023]
Abstract
This study evaluates the chemistry, kinetics, and mass transfer aspects of the removal of NO and SO2 simultaneously from flue gas induced by the combined heat and Fe2+ activation of aqueous persulfate. The work involves experimental studies and the development of a mathematical model utilizing a comprehensive reaction scheme for detailed process evaluation, and to validate the results of an experimental study at 30-70 °C, which demonstrated that both SO2 and Fe2+ improved NO removal, while the SO2 is almost completely removed. The model was used to correlate experimental data, predict reaction species and nitrogen-sulfur (N-S) product concentrations, to obtain new kinetic data, and to estimate mass transfer coefficient (KLa) for NO and SO2 at different temperatures. The model percent conversion results appear to fit the data remarkably well for both NO and SO2 in the temperature range of 30-70 °C. The conversions ranged from 43.2 to 76.5% and 98.9 to 98.1% for NO and SO2, respectively, in the 30-70 °C range. The model predictions at the higher temperature of 90 °C were 90.0 and 97.4% for NO and SO2, respectively. The model also predicted decrease in KLa for SO2 of 1.097 × 10-4 to 8.88 × 10-5 s-1 (30-90 °C) and decrease in KLa for NO of 4.79 × 10-2 to 3.67 × 10-2 s-1 (30-50 °C) but increase of 4.36 × 10-2 to 4.90 × 10-2 s-1 at higher temperatures (70-90 °C). This emerging sulfate-radical-based process could be applied to the treatment of flue gases from combustion sources. Graphical abstract.
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Affiliation(s)
- Yusuf G Adewuyi
- Chemical, Biological, and Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, NC, 27411, USA.
| | - Md Arif Khan
- Chemical, Biological, and Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, NC, 27411, USA
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13
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Djouider F. Kinetics and mechanism of the advanced oxidation process of Cr(III) to Cr(VI) by SO4
−˙ free radicals in slightly acidic simulated atmospheric water. RADIOCHIM ACTA 2019. [DOI: 10.1515/ract-2019-3134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
In a previous work, we showed that the oxidation of Cr(III) to Cr(VI) by OH˙ present in the atmospheric water droplets has the potential to threaten the people’s health since non-toxic species is transformed into environmental carcinogens. The same oxidation might be initiated by the SO4
−˙ free radicals. Here, we shed some light on the detailed mechanisms of this oxidation reaction occurring in ambient atmosphere. Steady state irradiation and pulse radiolysis technique were used to generate SO4
−˙. The advanced oxidation process mechanism was investigated at pH 4 and 6 selected as typical values of cloud water acidity. Our findings showed that the oxidation is pseudo-first order with respect to Cr(III) and is pH dependent. In the suggested reaction mechanism, the electron transfer proceeds via an inner sphere mechanism, with formation of the [Cr(III)–SO4
−˙] precursor adduct, followed by an electron transfer inside the adduct, from Cr(III) to SO4
−˙, to form Cr(IV):
Cr(III)
+
SO
4
−
·
⇌
[
C
r
(
III
)
–
SO
4
−
·
]
→
Cr(IV)
+
SO
4
2
−
.
$${\rm{Cr(III)}} + {\rm{S}}{{\rm{O}}_4}^{ - \cdot}[Cr({\rm{III}})-{\rm{S}}{{\rm{O}}_4}^{ -\cdot }] \to {\rm{Cr(IV)}} + {\rm{S}}{{\rm{O}}_4}^{2 - }.$$
At pH 4, the equilibrium constant and the rate constant are 7.52 × 104 M−1 and 2.47 × 104 s−1, respectively. At pH 6 these values become 1.90 × 105 M−1 and 1.41 × 104 s−1, respectively.
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Affiliation(s)
- Fathi Djouider
- Nuclear Engineering Department, Faculty of Engineering , King Abdulaziz University , Po Box 80204 , Jeddah, 21589 , Saudi Arabia , Tel.: +966 558822318, E-mail:
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14
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A study on simultaneous removal of NO and SO 2 by using sodium persulfate aqueous scrubbing. Chin J Chem Eng 2018. [DOI: 10.1016/j.cjche.2018.02.026] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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Ma J, Yang Y, Jiang X, Xie Z, Li X, Chen C, Chen H. Impacts of inorganic anions and natural organic matter on thermally activated persulfate oxidation of BTEX in water. CHEMOSPHERE 2018; 190:296-306. [PMID: 28992483 DOI: 10.1016/j.chemosphere.2017.09.148] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 09/16/2017] [Accepted: 09/30/2017] [Indexed: 05/06/2023]
Abstract
The present study investigated the impacts of water matrix constituents (CO32-, HCO3-, Cl-, Br-, PO43-, HPO42-, H2PO4-, NO3-, SO42- and natural organic matters (NOM) on the oxidation of a mixture of benzene, toluene, ethylbenzene, and xylenes (BTEX) by thermally activated persulfate (PS). In the absence of matrix constituents, the BTEX oxidation rates decreased in the following order: xylenes > toluene ≈ ethylbenzene > benzene. HCO3-/CO32- and NOM inhibited the BTEX oxidation and the inhibiting effects became more pronounced as the HCO3-/CO32-/NOM concentration increased. SO42-, NO3-, PO43- and H2PO4- did not affect the BTEX oxidation while HPO42- slightly inhibited the reaction. The impacts of Cl- and Br- were complex. Cl- inhibited the benzene oxidation while 100 mM and 500 mM of Cl- promoted the oxidation of m-xylene and p-xylene. Br- completely suppressed the benzene oxidation while 500 mM of Br- strongly promoted the oxidation of xylenes. Detailed explanations on the influence of each matrix constituent were discussed. In addition, various halogenated degradation byproducts were detected in the treatments containing Cl- and Br-. Overall, this study indicates that some matrix constituents such as NOM, HCO3-, CO32-, H2PO4-, Cl- and Br- may reduce the BTEX removal efficiency of sulfate radical-based advanced oxidation process (SR-AOP) and the presence of Cl- and Br- may even lead to the formation of toxic halogenated byproducts.
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Affiliation(s)
- Jie Ma
- State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China.
| | - Yongqi Yang
- State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China
| | - Xianchenghao Jiang
- State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China
| | - Zhuoting Xie
- State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China
| | - Xiaoxuan Li
- State Key Laboratory of Heavy Oil Processing, State Key Laboratory of Petroleum Pollution Control, Beijing Key Lab of Oil & Gas Pollution Control, China University of Petroleum-Beijing, Beijing 102249, China
| | - Changzhao Chen
- State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety & Environment Technology, Beijing 102206, China
| | - Hongkun Chen
- State Key Laboratory of Petroleum Pollution Control, CNPC Research Institute of Safety & Environment Technology, Beijing 102206, China
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16
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Liang C, Chen CY. Characterization of a Sodium Persulfate Sustained Release Rod for in Situ Chemical Oxidation Groundwater Remediation. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b00082] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chenju Liang
- Department of Environmental
Engineering, National Chung Hsing University, 250 Kuo-kuang Road, Taichung 402, Taiwan
| | - Cheng-Yu Chen
- Department of Environmental
Engineering, National Chung Hsing University, 250 Kuo-kuang Road, Taichung 402, Taiwan
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17
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Long A, Zhang H. Selective oxidative degradation of toluene for the recovery of surfactant by an electro/Fe²⁺/persulfate process. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:11606-11616. [PMID: 25847443 DOI: 10.1007/s11356-015-4406-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 03/18/2015] [Indexed: 06/04/2023]
Abstract
An electro/Fe(2+)/persulfate process has been conducted for toluene removal from surfactant (SDS) flushing solution, and the pseudo-second-order reaction rate constant (k2 value) of toluene removal has been optimized by a response surface methodology (RSM). The results indicated that in this process, the reaction between persulfate and externally added Fe(2+) generates sulfate-free radicals, and at the same time, Fe(2+) is electro-regenerated at the cathode by the reduction of Fe(3+). RSM based on Box-Behnken design (BBD) has been applied to analyze the experimental variables, of which the concentrations of persulfate and Fe(2+) showed a positive effect on the rate constant of toluene removal, whereas the concentration of SDS showed a negative effect. The interactions between pairs of variables proved to be significant, such as between SDS, persulfate, and Fe(2+) concentrations. ANOVA results confirmed that the proposed models were accurate and reliable for analysis of the variables of the electro/Fe(2+)/persulfate process. The shapes of the 3D response surfaces and contour plots showed that the SDS, persulfate, and Fe(2+) concentrations substantially affected the k2 value of toluene removal. The results indicated that increasing persulfate or Fe(2+) concentration increased the k2 value, whereas increasing SDS concentration decreased the k2 value. The reaction intermediates have been identified by GC-MS, and a plausible degradation pathway for toluene degradation is proposed.
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Affiliation(s)
- Anhua Long
- Department of Environmental Engineering, Wuhan University, Wuhan, 430079, China
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18
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Long A, Lei Y, Zhang H. Degradation of Toluene by a Selective Ferrous Ion Activated Persulfate Oxidation Process. Ind Eng Chem Res 2014. [DOI: 10.1021/ie402633n] [Citation(s) in RCA: 97] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anhua Long
- Department
of Environmental Engineering, Hubei Biomass-Resource Chemistry and
Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
- Jiangxi
Science and Technology Normal University, Jiangxi, 330013, China
| | - Yang Lei
- Department
of Environmental Engineering, Hubei Biomass-Resource Chemistry and
Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
| | - Hui Zhang
- Department
of Environmental Engineering, Hubei Biomass-Resource Chemistry and
Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan, 430079, China
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19
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Adewuyi YG, Khan MA, Sakyi NY. Kinetics and Modeling of the Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+. Ind Eng Chem Res 2013. [DOI: 10.1021/ie402801b] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yusuf G. Adewuyi
- Chemical, Biological and Bioengineering
Department, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, United States
| | - Md A. Khan
- Chemical, Biological and Bioengineering
Department, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, United States
| | - Nana Y. Sakyi
- Chemical, Biological and Bioengineering
Department, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, United States
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20
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Adewuyi YG, Sakyi NY. Removal of Nitric Oxide by Aqueous Sodium Persulfate Simultaneously Activated by Temperature and Fe2+ in a Lab-scale Bubble Reactor. Ind Eng Chem Res 2013. [DOI: 10.1021/ie4025177] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yusuf G. Adewuyi
- Chemical, Biological and
Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, United States
| | - Nana Y. Sakyi
- Chemical, Biological and
Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, United States
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21
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Adewuyi YG, Sakyi NY. Simultaneous Absorption and Oxidation of Nitric Oxide and Sulfur Dioxide by Aqueous Solutions of Sodium Persulfate Activated by Temperature. Ind Eng Chem Res 2013. [DOI: 10.1021/ie401649s] [Citation(s) in RCA: 119] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yusuf G. Adewuyi
- Chemical, Biological and Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, United States
| | - Nana Y. Sakyi
- Chemical, Biological and Bioengineering Department, North Carolina Agricultural and Technical State University, Greensboro, North Carolina 27411, United States
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22
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Yen CH, Chen KF, Kao CM, Liang SH, Chen TY. Application of persulfate to remediate petroleum hydrocarbon-contaminated soil: feasibility and comparison with common oxidants. JOURNAL OF HAZARDOUS MATERIALS 2011; 186:2097-102. [PMID: 21255917 DOI: 10.1016/j.jhazmat.2010.12.129] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 12/09/2010] [Accepted: 12/27/2010] [Indexed: 05/22/2023]
Abstract
In this study, batch experiments were conducted to evaluate the feasibility of petroleum-hydrocarbon contaminated soil remediation using persulfate oxidation. Various controlling factors including different persulfate and ferrous ion concentrations, different oxidants (persulfate, hydrogen peroxide, and permanganate), and different contaminants (diesel and fuel oil) were considered. Results show that persulfate oxidation is capable of treating diesel and fuel oil contaminated soil. Higher persulfate and ferrous ion concentrations resulted in higher diesel degrading rates within the applied persulfate/ferrous ion molar ratios. A two-stage diesel degradation was observed in the batch experiments. In addition, treatment of diesel-contaminated soil using in situ metal mineral activation under ambient temperature (e.g., 25°C) may be a feasible option for site remediation. Results also reveal that persulfate anions could persist in the system for more than five months. Thus, sequential injections of ferrous ion to generate sulfate free radicals might be a feasible way to enhance contaminant oxidation. Diesel oxidation efficiency and rates by the three oxidants followed the sequence of hydrogen peroxide>permanganate>persulfate in the limited timeframes. Results of this study indicate that the application of persulfate oxidation is a feasible method to treat soil contaminated by diesel and fuel oil.
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Affiliation(s)
- Chia-Hsien Yen
- Environmental Protection Bureau, Nantou County Government, No. 660, Zhongxing Rd., Nantou City, Nantou 54001, Taiwan
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23
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Liang C, Chen YJ. Evaluation of activated carbon for remediating benzene contamination: adsorption and oxidative regeneration. JOURNAL OF HAZARDOUS MATERIALS 2010; 182:544-551. [PMID: 20621415 DOI: 10.1016/j.jhazmat.2010.06.066] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2009] [Revised: 04/29/2010] [Accepted: 06/16/2010] [Indexed: 05/29/2023]
Abstract
This study investigated the potential usage of activated carbon (AC) as a permeable reactive barrier material for the adsorption of benzene contaminant. Sodium persulfate (SPS) or pyrite (FeS(2)) activated SPS oxidation was used for the regeneration of spent AC. Results indicate that persulfate oxidation of AC caused a loss of electrons and a reduction in adsorptive capacity due to the formation of acidic functional groups on the AC. Concerning the reactants that can be used for oxidation of the benzene contaminants, SPS/FeS(2)/AC, as oppose to SPS/AC, can achieve benzene destruction in both the aqueous and the sorbed phases. Furthermore, regeneration of benzene spent AC by SPS or SPS/FeS(2) revealed that SPS oxidation resulted primarily in desorption of benzene over direct oxidation of AC sorbed benzene. In contrast, the SPS/FeS(2) system achieved complete oxidation of desorbed benzene in the aqueous phase while also oxidizing sorbed benzene. Results of re-adsorption show that oxidative regeneration recovered around 70% of the AC adsorption sites and the remaining capacity was mostly occupied by the residual benzene on the AC. This study demonstrates that SPS or FeS(2) activated SPS oxidation is an effective alternative method for the regeneration of spent AC.
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Affiliation(s)
- Chenju Liang
- Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-kuang Road, Taichung 402, Taiwan.
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24
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Khan NE, Adewuyi YG. Absorption and Oxidation of Nitric Oxide (NO) by Aqueous Solutions of Sodium Persulfate in a Bubble Column Reactor. Ind Eng Chem Res 2010. [DOI: 10.1021/ie100607u] [Citation(s) in RCA: 113] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nymul E. Khan
- Department of Chemical and Bioengineering, North Carolina A&T State University, Greensboro, North Carolina 27411
| | - Yusuf G. Adewuyi
- Department of Chemical and Bioengineering, North Carolina A&T State University, Greensboro, North Carolina 27411
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