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Jin Y, Huang P, Chen X, Li LP, Lin CY, Chen X, Ding R, Liu J, Chen R. Ciprofloxacin degradation performances and mechanisms by the heterogeneous electro-Fenton with flocculated fermentation biochar. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 324:121425. [PMID: 36898645 DOI: 10.1016/j.envpol.2023.121425] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 03/08/2023] [Indexed: 06/18/2023]
Abstract
Antibiotic fermentation residue flocculated by polymeric ferric sulfate (PFS) has been classified as a "hazardous waste" in China. In this study, it was recycled into antibiotic fermentation residue biochar (AFRB) by pyrolysis and used as a heterogeneous electro-Fenton (EF) catalyst for ciprofloxacin (CIP) degradation. The results show that PFS was reduced to Fe0 and FeS during pyrolysis, which was beneficial for the EF process. The AFRB with mesoporous structures exhibited soft magnetic features, which were convenient for separation. CIP was completely degraded within 10 min by the AFRB-EF process at an initial concentration of 20 mg/L. Increasing the working current and catalyst dosage within a certain range could improve the degradation rate. ·OH and O2·- were the dominant reactive oxygen species that played critical roles for CIP degradation. The antibacterial groups of CIP have been destroyed by the heterogeneous electro-Fenton process and its toxicity was negligible. The AFRB showed satisfactory performance, even though it was recycled five times. This study provide new insights into the resourceful treatment of antibiotic fermentation residues.
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Affiliation(s)
- Yanchao Jin
- College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, 350007, China
| | - Peiwen Huang
- College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China
| | - Xiongjian Chen
- College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China
| | - Li-Ping Li
- Research and Development Center for Watershed Environmental Eco-Engineering, Beijing Normal University, Zhuhai, 519087, PR China
| | - Chun-Yan Lin
- School of Materials and Chemical Engineering, Minjiang University, Fuzhou, 350108, Fujian, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, 350007, China
| | - Xiao Chen
- College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, 350007, China
| | - Rui Ding
- College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, 350007, China
| | - Jianxi Liu
- College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, 350007, China
| | - Riyao Chen
- College of Environmental and Resource Sciences, Fujian Normal University, Fuzhou, 350117, Fujian, China; Fujian Key Laboratory of Pollution Control & Resource Reuse, Fuzhou, 350007, China.
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Pal P, Schafer MC, Hendrich MP, Ryabov AD, Collins TJ. The Mechanism of Formation of Active Fe-TAMLs Using HClO Enlightens Design for Maximizing Catalytic Activity at Environmentally Optimal, Circumneutral pH. Inorg Chem 2023; 62:5586-5592. [PMID: 36967523 PMCID: PMC10091481 DOI: 10.1021/acs.inorgchem.3c00104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/28/2023]
Abstract
Fe-TAML/peroxide catalysis provides simple, powerful, ultradilute approaches for removing micropollutants from water. The typically rate-determining interactions of H2O2 with Fe-TAMLs (rate constant kI) are sharply pH-sensitive with rate maxima in the pH 9-10 window. Fe-TAML design or process design that shifts the maximum rates to the pH 6-8 window of most wastewaters would make micropollutant eliminations even more powerful. Here, we show how the different pH dependencies of the interactions of Fe-TAMLs with peroxide or hypochlorite to form active Fe-TAMLs (kI step) illuminate why moving from H2O2 (pKa, ca. 11.6) to hypochlorite (pKa, 7.5) shifts the pH of the fastest catalysis to as low as 8.2. At pH 7, hypochlorite catalysis is 100-1000 times faster than H2O2 catalysis. The pH of maximum catalytic activity is also moderated by the pKa's of the Fe-TAML axial water ligands, 8.8, 9.3, and 10.3, respectively, for [Fe{4-NO2C6H3-1,2-(NCOCMe2NSO2)2CHMe}(H2O)n]- (2) [n = 1-2], [Fe{4-NO2C6H3-1,2-(NCOCMe2NCO)2CF2}(H2O)n]- (1b), and [Fe{C6H4-1,2-(NCOCMe2NCO)2CMe2}(H2O)n]- (1a). The new bis(sulfonamido)-bis(carbonamido)-ligated 2 exhibits the lowest pKa and delivers the largest hypochlorite over peroxide catalytic rate advantage. The fast Fe-TAML/hypochlorite catalysis is accompanied by slow noncatalytic oxidations of Orange II.
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MoS2 and MoS2 Nanocomposites for Adsorption and Photodegradation of Water Pollutants: A Review. Molecules 2022; 27:molecules27206782. [PMID: 36296375 PMCID: PMC9610774 DOI: 10.3390/molecules27206782] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/04/2022] [Accepted: 10/07/2022] [Indexed: 11/30/2022] Open
Abstract
The need for fresh and conveniently treated water has become a major concern in recent years. Molybdenum disulfide (MoS2) nanomaterials are attracting attention in various fields, such as energy, hydrogen production, and water decontamination. This review provides an overview of the recent developments in MoS2-based nanomaterials for water treatment via adsorption and photodegradation. Primary attention is given to the structure, properties, and major methods for the synthesis and modification of MoS2, aiming for efficient water-contaminant removal. The combination of MoS2 with other components results in nanocomposites that can be separated easily or that present enhanced adsorptive and photocatalytic properties. The performance of these materials in the adsorption of heavy metal ions and organic contaminants, such as dyes and drugs, is reviewed. The review also summarizes current progress in the photocatalytic degradation of various water pollutants, using MoS2-based nanomaterials under UV-VIS light irradiation. MoS2-based materials showed good activity after several reuse cycles and in real water scenarios. Regarding the ecotoxicity of the MoS2, the number of studies is still limited, and more work is needed to effectively evaluate the risks of using this nanomaterial in water treatment.
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Ding Y, Cui K, Liu X, Xie Q, Guo Z, Chen Y. Lignin peroxidase-catalyzed direct oxidation of trace organic pollutants through a long-range electron transfer mechanism: Using propranolol as an example. JOURNAL OF HAZARDOUS MATERIALS 2022; 431:128544. [PMID: 35228075 DOI: 10.1016/j.jhazmat.2022.128544] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 02/05/2022] [Accepted: 02/20/2022] [Indexed: 06/14/2023]
Abstract
In this work, lignin peroxidase (LiP) was extracted for the in vitro degradation of a persistent compound (propranolol, PPN). The results showed that 94.2% of PPN was degraded at 30 U L-1 LiP activity and 10 mg L-1 PPN. The PPN degradation rate increased from 33.5% to 94.2% when the veratryl alcohol (VA) concentration varied from 0 to 180 µM, but decreased to 73.1% with further VA addition. This phenomenon confirmed that VA was indispensable, however, it also acted as a competitive inhibitor of PPN oxidation. Computational analysis revealed that the Trp171…iron porphyrin (TRP-FeP) path was responsible for specific substrate (e.g., VA) transformation, and another long-range electron transfer (LRET) path through His-Asp…FeP (HSP-FeP) was discovered for non-specific substrate (e.g., PPN) degradation. These two electron-transfer routes shared one catalytic center, and VA protected the enzyme from H2O2-dependent inactivation. The HSP-FeP path transformed PPN through single electron transfer or H abstraction mechanisms. In addition, hydroxyl radicals generated in the LiP/H2O2 system were involved in the hydroxylation of the PPN intermediates. Possible degradation pathways were deduced using these degradation mechanisms and mass-spectrometry analysis. The multipath degradation mechanism endowed LiP with a remarkable capacity for removing various recalcitrant pollutants in environmental remediation.
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Affiliation(s)
- Yan Ding
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei 230009, China
| | - Kangping Cui
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei 230009, China.
| | - Xueyan Liu
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei 230009, China
| | - Qijun Xie
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei 230009, China
| | - Zhi Guo
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei 230009, China
| | - Yihan Chen
- School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei 230009, China
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Tomek J, Wang ZJ, Burton RAB, Herring N, Bub G. COSMAS: a lightweight toolbox for cardiac optical mapping analysis. Sci Rep 2021; 11:9147. [PMID: 33911090 PMCID: PMC8080775 DOI: 10.1038/s41598-021-87402-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 03/22/2021] [Indexed: 12/14/2022] Open
Abstract
Optical mapping is widely used in experimental cardiology, as it allows visualization of cardiac membrane potential and calcium transients. However, optical mapping measurements from a single heart or cell culture can produce several gigabytes of data, warranting automated computer analysis. Here we present COSMAS, a software toolkit for automated analysis of optical mapping recordings in cardiac preparations. COSMAS generates activation and conduction velocity maps, as well as visualizations of action potential and calcium transient duration, S1-S2 protocol analysis, and alternans mapping. The software is built around our recent 'comb' algorithm for segmentation of action potentials and calcium transients, offering excellent performance and high resistance to noise. A core feature of our software is that it is based on scripting as opposed to relying on a graphical user interface for user input. The central role of scripts in the analysis pipeline enables batch processing and promotes reproducibility and transparency in the interpretation of large cardiac data sets. Finally, the code is designed to be easily extended, allowing researchers to add functionality if needed. COSMAS is provided in two languages, Matlab and Python, and is distributed with a user guide and sample scripts, so that accessibility to researchers is maximized.
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Affiliation(s)
- Jakub Tomek
- Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, UK. .,Department of Computer Science, University of Oxford, Oxford, UK.
| | | | | | - Neil Herring
- Department of Physiology, Anatomy, and Genetics, University of Oxford, Oxford, UK
| | - Gil Bub
- Department of Physiology, McGill University, Montréal, Canada
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