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Yan F, Xu X, An L, Du W, Shen W, Yang KL, Ye J, Dai R. Highly efficient treatment of tetracycline using coupled electro-Fenton and electrocoagulation process: Mechanism and toxicity assessment. CHEMOSPHERE 2024; 362:142664. [PMID: 38901704 DOI: 10.1016/j.chemosphere.2024.142664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 06/13/2024] [Accepted: 06/18/2024] [Indexed: 06/22/2024]
Abstract
In this study, a novel carbon fiber brush (CFB) electrode was designed using carbon fiber filaments and conductive metals. It was used as the cathode to construct an efficient coupled electro-Fenton and electrocoagulation (EF-EC) process for tetracycline (TC) treatment. An optimal 97.9% removal rate of 10 mg L-1 TC was achieved within 20 min. The coupled process is less pH-dependent and more effective in treating TC compared to the traditional individual electro-Fenton (EF) or electrocoagulation (EC) process, achieving efficient TC removal under neutral pH conditions. The removal rate of 10 mg L-1 TC consistently remained above 92% at 20 min after ten cycle experiments using the same electrodes in a Fe-CFB system (92.7-97.9%), indicating excellent reusability and stability of the CFB cathode. Mechanism analysis showed both EF and EC processes were involved in the system. Radicals (such as •OH and SO4-•) generated by EF contributed to the degradation of TC, yielding nine intermediates. Coagulants (such as Fe(OH)3) generated by EC contributed to the removal of TC. Toxicity prediction results indicated that over half of the nine intermediates exhibited lower biotoxicity compared to TC. This study provides a feasible alternative cathode for the efficient treatment of TC using EF-EC process.
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Affiliation(s)
- Feng Yan
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China; Shanghai Energy Construction Engineering Design & Research Co., Shanghai, 200135, China
| | - Xin Xu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Lili An
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Wenjun Du
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Wendi Shen
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Kun-Lin Yang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117576, Singapore
| | - Jianfeng Ye
- School of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Ruihua Dai
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China.
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Gu X, Li J, Feng X, Qu W, Wang W, Wang J. Efficient removal of norfloxacin from water using batch airlift-electrocoagulation reactor: optimization and mechanisms analysis. RSC Adv 2023; 13:8944-8954. [PMID: 36936850 PMCID: PMC10021078 DOI: 10.1039/d3ra00471f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Accepted: 03/13/2023] [Indexed: 03/19/2023] Open
Abstract
In this study, we developed an airlift-electrocoagulation (AL-EC) reactor to remove norfloxacin (NOR) from water. Six parameters influencing NOR removal were investigated, and the possible removal mechanism was proposed based on flocs characterization and intermediates analysis. The performances for treating different antibiotics and removing NOR from 3 types of water were also evaluated. The best NOR removal efficiency was obtained with the iron anode and aluminum cathode combination, a current density of 2 mA cm-2, an initial pH of 7, a treatment time of 32 minutes and an air flow rate of 200 mL min-1, the supporting electrolyte type was NaCl, and the initial NOR concentration was 10 mg L-1. Flocs adsorption and electrochemical oxidation were the main ways to remove NOR from water. The average removal efficiency of the AL-EC reactor exceeded 60% of the different antibiotic concentrations in artificial and real water. The highest NOR removal rate reached 93.48% with an operating cost of 0.153 USD m-3. The present work offers a strategy for NOR removal from water with high efficiency and low cost, showing a huge potential for the application of the AL-EC in antibiotic contaminated water treatment.
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Affiliation(s)
- Xuege Gu
- College of Water Conservancy and Architectural Engineering, Shihezi University Shihezi 832000 PR China
| | - Junfeng Li
- College of Water Conservancy and Architectural Engineering, Shihezi University Shihezi 832000 PR China
| | - Xueting Feng
- College of Water Conservancy and Architectural Engineering, Shihezi University Shihezi 832000 PR China
| | - Wenying Qu
- College of Water Conservancy and Architectural Engineering, Shihezi University Shihezi 832000 PR China
| | - Wenhuai Wang
- College of Water Conservancy and Architectural Engineering, Shihezi University Shihezi 832000 PR China
| | - Jiankang Wang
- College of Water Conservancy and Architectural Engineering, Shihezi University Shihezi 832000 PR China
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Karungamye P, Rugaika A, Mtei K, Machunda R. A Review of Methods for Removal of Ceftriaxone from Wastewater. J Xenobiot 2022; 12:223-235. [PMID: 35997364 PMCID: PMC9397013 DOI: 10.3390/jox12030017] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Revised: 07/09/2022] [Accepted: 07/27/2022] [Indexed: 11/16/2022] Open
Abstract
The presence of pharmaceuticals in surface water and wastewater poses a threat to public health and has significant effects on the ecosystem. Since most wastewater treatment plants are ineffective at removing molecules efficiently, some pharmaceuticals enter aquatic ecosystems, thus creating issues such as antibiotic resistance and toxicity. This review summarizes the methods used for the removal of ceftriaxone antibiotics from aquatic environments. Ceftriaxone is one of the most commonly prescribed antibiotics in many countries, including Tanzania. Ceftriaxone has been reported to be less or not degraded in traditional wastewater treatment of domestic sewage. This has piqued the interest of researchers in the monitoring and removal of ceftriaxone from wastewater. Its removal from aqueous systems has been studied using a variety of methods which include physical, biological, and chemical processes. As a result, information about ceftriaxone has been gathered from many sources with the searched themes being ceftriaxone in wastewater, ceftriaxone analysis, and ceftriaxone removal or degradation. The methods studied have been highlighted and the opportunities for future research have been described.
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Affiliation(s)
- Petro Karungamye
- Department of Chemistry, The University of Dodoma (UDOM), Dodoma P.O. Box 338, Tanzania
- School of Materials Energy Water and Environmental Sciences, The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania; (A.R.); (K.M.); (R.M.)
- Correspondence: or ; Tel.: +255-763750792
| | - Anita Rugaika
- School of Materials Energy Water and Environmental Sciences, The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania; (A.R.); (K.M.); (R.M.)
| | - Kelvin Mtei
- School of Materials Energy Water and Environmental Sciences, The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania; (A.R.); (K.M.); (R.M.)
| | - Revocatus Machunda
- School of Materials Energy Water and Environmental Sciences, The Nelson Mandela African Institution of Science and Technology, Arusha P.O. Box 447, Tanzania; (A.R.); (K.M.); (R.M.)
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