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Li J, Zhou W, Meng X, Su Y, Zhao Y, Zhang W, Xie L, Gao J, Sun F, Wang P, Zhao G. Heat and mass transfer simulation of the microwave-assisted toluene desorption for activated carbons regeneration. ENVIRONMENTAL RESEARCH 2024; 251:118671. [PMID: 38479719 DOI: 10.1016/j.envres.2024.118671] [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: 01/04/2024] [Revised: 03/05/2024] [Accepted: 03/09/2024] [Indexed: 03/17/2024]
Abstract
The low cost and high efficiency of microwave-assisted regeneration render it a viable alternative to conventional regeneration methods. To enhance the regeneration performance, we developed a coupled electromagnetic, heat, and mass transfer model to investigate the heat and mass transfer mechanisms of activated carbon during microwave-assisted regeneration. Simulation results demonstrated that the toluene desorption process is governed by temperature distribution. Changing the input power and flow rate can promote the intensity of hot spots and adjust their distribution, respectively, thereby accelerating toluene desorption, inhibiting readsorption, and promoting regeneration efficiency. Ultimately, controlling the input power and flow rate can flexibly adjust toluene emissions to satisfy the processing demands of desorbed toluene. Taken together, this study provides a comprehensive understanding of the heat and mass transfer mechanisms of microwave-assisted regeneration and insights into adsorbent regeneration.
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Affiliation(s)
- Junfeng Li
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Wei Zhou
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China.
| | - Xiaoxiao Meng
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China.
| | - Yanlin Su
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Yang Zhao
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Wenshuang Zhang
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Liang Xie
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Jihui Gao
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Fei Sun
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Pengxiang Wang
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
| | - Guangbo Zhao
- School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, People's Republic of China
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Song Y, Yu Y, Jin M, Hou C, Wang J, Wang X, Zhou X, Chen J, Shen Z, Zhang Y. Sulfadiazine removal efficiency with persulfate driven by electron-rich Cu-beta zeolites. CHEMOSPHERE 2023; 344:140300. [PMID: 37777089 DOI: 10.1016/j.chemosphere.2023.140300] [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: 06/02/2023] [Revised: 09/07/2023] [Accepted: 09/25/2023] [Indexed: 10/02/2023]
Abstract
Surface electron transport and transfer of catalysts have important consequences for persulfate (PS) activation in PS system. In this paper, an electron-rich Cu-beta zeolites catalyst was synthesized utilizing a straightforward solid-state ion exchange technique to efficiently degrade sulfadiazine. The X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR) results revealed that Cu element substitutes Al element and enters the beta molecular sieve framework smoothly. Furthermore, the X-ray photoelectron spectroscopy (XPS) measurements demonstrated that the Cu-beta catalyst is primarily Cu0. Cu-beta zeolites catalyst can exhibit excellent catalytic activity to degrade sulfadiazine with the oxidant of PS. The optimal sulfadiazine removal performance was explored by adjusting reaction parameters, including sulfadiazine concentration, catalyst dosage, oxidant dosage, and solution pH. The sulfadiazine removal efficiency in the Cu-beta zeolites/PS system could reach 90.5% at the optimal reaction condition ([PS]0 = 0.5 g/L, [Cu-beta zeolites]0 = 1.0 g/L, pH = 7.0) with 50 mg/L of sulfadiazine. Meanwhile, The degradation efficiency was less affected by anionic interference (Cl-, SO4-, HCO3-). The surface electron transport and transfer of the Cu-beta zeolites catalyst were significant causes for the remarkable degradation performance. According to electron paramagnetic resonance (EPR) and quenching studies, the Cu-beta zeolites/PS system was mostly dominated by SO4•- in the degradation of sulfadiazine. Furthermore, two possible pathways for sulfadiazine degradation were proposed according to the analysis of intermediate products detected by the liquid chromatography-mass spectrometry (LC-MS).
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Affiliation(s)
- Yuanbo Song
- Institute of New Rural Development, School of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China
| | - Yibiao Yu
- Institute of New Rural Development, School of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China
| | - Mengyu Jin
- Institute of New Rural Development, School of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China
| | - Cheng Hou
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Jiaqi Wang
- Institute of New Rural Development, School of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China
| | - Xiaoxia Wang
- Institute of New Rural Development, School of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China
| | - Xuefei Zhou
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Jiabin Chen
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Zheng Shen
- Institute of New Rural Development, School of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China; College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China.
| | - Yalei Zhang
- Institute of New Rural Development, School of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China; College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
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Li L, Li J, Yan Y, Ma R, Zhang X, Wang J, Shen Y, Ullah H, Lu L. Removal of organophosphorus flame retardant by biochar-coated nZVI activating persulfate: Synergistic mechanism of adsorption and catalytic degradation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023:121880. [PMID: 37236590 DOI: 10.1016/j.envpol.2023.121880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 04/21/2023] [Accepted: 05/23/2023] [Indexed: 05/28/2023]
Abstract
Triphenyl phosphate (TPhP) is a typical aromatic-based non-chlorinated organophosphorus flame retardant, which has been widely detected in a variety of environments and poses high environmental and human health risks. In this study, biochar coated nano-zero-valent iron (nZVI) was fabricated to activate persulfate (PS) to degrade TPhP from water. A range of biochars (BC400, BC500, BC600, BC700, and BC800) was prepared as potential support to coat nZVI by pyrolyzing corn stalk at 400, 500, 600, 700 and 800 °C. As outperformed other biochars in adsorption rate, adsorption capacity, and less reluctant to be influenced by environmental factors (pH, humic acid (HA), coexistence of anions), BC800 was to act as support to coat nZVI (labeled as BC800@nZVI). SEM, TEM, XRD and XPS characterization showed that nZVI was successfully supported on the BC800. Removal efficiency of 10 mg L-1 TPhP by BC800@nZVI/PS could reach to 96.9% with a high catalytic degradation kinetic rate of 0.0484 min-1 under optimal condition. The removal efficiency remained stable in a wide pH range (3-9) and moderate concentration of HA and coexistence of anions, demonstrated the promising of using BC800@nZVI/PS system to eliminate TPhP contamination. Results from the radical scavenging and electron paramagnetic resonance (EPR) experiments demonstrated radical pathway (i.e. SO4·- and HO·) and non-radical pathway via 1O2 both play important role in TPhP degradation. The TPhP degradation pathway was proposed based on the six degradation intermediates analyzed by LC-MS. This study illustrated the synergistic mechanism of adsorption and catalytic oxidation removal of TPhP by BC800@nZVI/PS system, and provided a cost-efficient approach for TPhP remediation.
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Affiliation(s)
- Liangzhong Li
- State Environmental Protection Key Laboratory of Environ Pollut Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, 510655, China
| | - Jianjun Li
- Longnan Ecology and Environment Bureau, Longnan, 746000, China
| | - Yile Yan
- State Environmental Protection Key Laboratory of Environ Pollut Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, 510655, China
| | - Ruixue Ma
- State Environmental Protection Key Laboratory of Environ Pollut Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, 510655, China
| | - Xiaohui Zhang
- State Environmental Protection Key Laboratory of Environ Pollut Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, 510655, China
| | - Jun Wang
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Environmental Science and Engineering, Tiangong University, Tianjin, 300387, China
| | - Yi Shen
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou, 310032, China
| | - Habib Ullah
- Department of Environmental Science, Zhejiang University, Hangzhou, 310058, China
| | - Lun Lu
- State Environmental Protection Key Laboratory of Environ Pollut Health Risk Assessment, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou, 510655, China.
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Influences of different surface oxygen species on oxidation of toluene and/or benzene and their reaction pathways over Cu-Mn metal oxides. J Colloid Interface Sci 2023; 630:301-316. [DOI: 10.1016/j.jcis.2022.10.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 10/13/2022] [Accepted: 10/20/2022] [Indexed: 11/06/2022]
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