WATER RESEARCH
·
2021
·
IF 11.236
Bingliang Zhang,Xuening Wang,Zhuoyao Fang,Shu Wang,Chao Shan,Si Wei,Bingcai Pan
ABSTRACT Ultraviolet-based advanced oxidation processes (UV-AOPs) are very promising in advanced treatment of municipal secondary effluents. However, the transformation of dissolved effluent organic matter (dEfOM) in advanced treatment of real wastewater, particularly at molecular level, remains unclear. In this study, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) coupled with multiple statistical analysis were performed to better understand the transformation of dEfOM in UV/H 2 O 2 , UV/persulfate (UV/PS), and UV/chlorine treatments. An obvious increase in oxygen content of dEfOM was observed after every UV-AOPs treatment, and the detailed oxygenation processes were further uncovered by mass difference analysis based on 24 types of typical reactions. Generally, UV/H 2 O 2 process was subjected to the most oxygenation reactions with the typical tri-hydroxylation one (+3O), whereas di-hydroxylation reaction (+H 2 O 2 ) was dominant in UV/PS and UV/chlorine processes. Additionally, the three UV-AOPs shared the majority of precursors, and more proportions of unique products were identified for each process. The precursors with lower H/C and higher aromaticity were readily degraded by UV/chlorine over UV/H 2 O 2 and UV/PS, with the products featuring lower molecular weight. Moreover, dEfOM of high aromaticity tended to produce chlorinated byproducts through addition reactions in chlorination and UV/chlorine processes. Among these UV-AOPs, the highest reduction of both acute toxicity and specific UV absorbance at 254 nm (SUVA 254 ) was observed for UV/chlorine, implying the potential for UV/chlorine process in advanced treatment of wastewater. In addition, acute toxicity was highly correlated with SUVA 254 and CHOS compounds. This study is believed to help better understand the different fates of dEfOM in real wastewater during UV-AOPs treatment.
研究领域:
环境科学
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废水处理
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Pengfei Gan,Yichun Sun,Yunyi Li,Wen Liu,Jiangyu Ye,Meiping Tong,Jialiang Liang
In this work, the different selectivity of SO 4 •- and • OH towards municipal solid waste incineration leachates (MSWILs) was studied by a comparative study of UV/persulfate (PS) and UV/H 2 O 2 . Results showed SO 4 •- preferentially mineralized carbon atoms of higher average oxidation state, while • OH showed a two-stage mechanism of partial oxidation and mineralization successively. Electron spin resonance (ESR) analysis showed SO 4 •- had superior selectivity towards MSWILs than • OH, and Fe(II) would significantly affect the selectivity via forming Fe-MSWILs complex. As the consequence, Fe(II) showed slightly negative effect on UV/PS, but greatly enhanced the performance of UV/H 2 O 2 /Fe(II). High concentration of Cl - affected the degradation of non-fluorescent substances by UV/PS, while SO 4 2 - and NO 3 - showed no effect. In contrast, anions showed no effect on UV/H 2 O 2 . In addition, • OH preferentially attacked large molecules, but SO 4 •- showed no selectivity. This study further revealed the selectivity of SO 4 •- and • OH in the treatment of hypersaline wastewater, and provided theoretical support for the development of targeted technology .
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2023
·
IF 11.4
Wenjun Sun,Yuanna Zhang,Zedong Lu,Yanchu Ke,Xuelin Wang,Jing Wu
Organic pollutants are toxic and are present in drinking water. The conventional processes of most water plants can basically meet the discharge standard. However, based on the improvement of the objective of organic pollutants control and the constant change of water characteristics, the results may not be ideal. This study evaluates the effectiveness of different treatments such as microfiltration, nanofiltration, reverse osmosis, activated carbon, and ultraviolet irradiation/H2O2 in terms of the removal of organic pollutants. Among the DOM results, nanofiltration, reverse osmosis, and activated carbon showed optimal performance due to the characteristics of processes and the compound properties. However, the risks of low-molecular-weight organic residue and byproduct formation are still present. Thirty-nine species of synthetic organic compounds (SOC) were qualitatively and semiquantitatively analyzed. Different technologies showed varying removal capabilities for SOC based on their properties and many substances coexisted leading to abnormal removal performances. These residual organics showed the characteristics of lower molecular weight, more hydrophilicity, further unknown impacts, and with risk of DBPs. Based on the above insights, possible methods can be rationally chosen for on-demand decontamination of organics in unconfined aquatic environment and long-time impact on water characteristics and human health also should be considered.
研究领域:
环境科学
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水处理工程
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公共卫生
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产品关联
DOI
PubMed
高影响因子
eFood
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2024
·Vol. 5
·期 3
·e147
·
IF 4
Biyang Zhu,Liuting Li,Kseniya Hileuskaya,Baojun Xu,Lijun You
Although ultraviolet (UV)/H 2 O 2 treatment could effectively improve the bioactivities of polysaccharides, the relationship between free radical-induced structural changes and the bioactivities of products remains unknown. Therefore, this work investigated the changes in the chemical characteristics and chain conformations of degraded dextrans by the UV/H 2 O 2 system as well as their antioxidant and anti-inflammatory activities. The apparent degradation efficiencies of dextrans under different UV/H 2 O 2 parameters were first investigated. UV/H 2 O 2 treatment effectively destroyed the pyranose rings and glycosidic bonds of dextrans and significantly improved their uronic acid and carboxy contents. Furthermore, conformational studies revealed that besides the rapid decrease in the molecular weight, the compact spherical conformation of dextrans was gradually depolymerized into the flexible random coil conformation. Moreover, the significant antioxidant and anti-inflammatory activities of the degraded dextrans were mainly attributed to their more extended random coil chains, increased quantity of reducing groups, and lower molecular sizes. This study contributes to investigating the structure–activity relationship of polysaccharides prepared by free radicals-mediated degradation.
研究领域:
化学
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药学
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生物化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2023
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IF 8.8
Jun Young Kim,Kang Hoon Lee,Jae Won Lee,Imtiaz Afzal Khan,Jong-Oh Kim
In this study, the removal efficiency of chemicals of emerging concerns (CECs) was evaluated under exposure to various doses of UV/H 2 O 2 -based oxidation processes in combination with membrane filtration for three cleaning cycles. Polyethersulphone (PES) and polyvinylidene fluoride (PVDF) materials based membranes were used for this study. The chemical cleaning of the membranes was performed by immersion of the membranes into 1 N HCl followed by adding 3000 mg.L −1 NaOCl for 1hr. Degradation and filtration performance was evaluated using Liquid Chromatography with tandem mass spectrometry (LC-MS/MS) and total organic carbon (TOC) analysis. Membrane fouling analysis for assessing the comparative performance of PES and PVDF membranes was determined by specific fouling and fouling indices evaluation. Membrane characterization results show that the alkynes and carbonyl group formation are due to dehydrofluorination and oxidation of PVDF and PES membranes under the attack of foulants and cleaning chemicals, which resulted in a reduction of fluoride percentage and an increase in sulfur percentage in the PVDF and PES membranes. A decrease in the hydrophilicity of the membranes in underexposed conditions was observed and is consistent with an increase in dose. Degradation results of CECs follow with the highest removal efficiency of chlortetracycline (CTC) followed by atenolol (ATL), acetaminophen (ACT), and caffeine (CAF) degradation due to attack on the aromatic ring and the carbonyl group of CECs by OH exposure. Membrane exposed at 3 mg.L-1 dose of UV/H 2 O 2 -based CECs shows minimum alteration with higher filtration efficiency and lower fouling, particularly in PES membranes.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Yulun Nie,Xiaofei Sun,Miao Wang,Xike Tian,Chao Yang,Chu Dai
UV-H 2 O 2 is the most widely used oxidizing system with established effectiveness and a high level of technical development for practical application. However, little attention was paid on the effect of suspended particles in natural water on organic contaminants removal via UV-H 2 O 2 technique. In this study, this effect of suspended particles to enhance the contaminant degradation was explored using silica/alumina-based oxides (MCM-41 and Al@MCM-41) as the representative. The results showed that MCM-41 had no effect on OFX degradation compared with UV-H 2 O 2 . While the degradation efficiency and reaction rate were greatly enhanced at a pH range of 3.0–9.0 especially at acidic pH values (3.0–5.0) in the presence of Al@MCM-41. The probe experiments proved that OFX adsorption followed by surface reaction process played an important role to enhance the performance of UV-H 2 O 2 . Based on the characterization results, the positive effect of suspended particles was not related to their surface area and pore size distribution, but dependent on the chemical composition and surface acid-base property. The suspended particles can provide an active surface composed of acid and base sites. The base site can create a local basic micro-environment by producing more • OH et al. While the dissociated acid sites in Al@MCM-41 with a negative charged surface favor OFX adsorption and then reaction with produced ROS . Our findings suggest that the enhanced performance of UVA-H 2 O 2 induced by suspended particles should be concerned.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Shaoyu Tang,Lei Xu,Xiaolong Yu,Shuona Chen,Huanyong Li,Ying Huang,Junfeng Niu
Degradation of capecitabine was conducted using electrochemical oxidation, UV/H 2 O 2 oxidation, and ozonation. Capecitabine was efficiently degraded by three advanced oxidation processes. The degradation rates of capecitabine achieved approximately 99.0% after 4 min of ozonation, 12 min of electrochemical oxidation, and 30 min of UV/H 2 O 2 oxidation. The mineralization rate obtained was merely 10.3% for ozonation at 60 min, compared to 91.7% for electrochemical oxidation and 55.3% for UV/H 2 O 2 oxidation. Capecitabine was degraded by oxidation, defluorination, hydrogenation, hydrolysis, ring and bond cleavage. Thus, multiple intermediates were generated during the degradation process, such as F - , formic acid, acetic acid, oxalic acid, and other intermediate metabolites with lager molecules. A total of eighteen metabolites, except for F - and carboxylic acids, were identified by QTOF-HRMS, where six of them could only be detected by the electrochemical oxidation process, two of them were by the UV/H 2 O 2 oxidation process, and one of them by the ozonation process. Electrochemical oxidation was the only process that could achieve over 90% removal of cytotoxicity and genotoxicity, and the metabolites were non-genotoxic after 60 min of reaction. The number of live cells decreased with the increasing reaction time in ozonation, demonstrating the higher toxicity of the intermediates in ozonation. Energy cost evaluation results suggested that the lowest energy consumption was achieved at 1.8 kWh/m 3 for 90% of capecitabine degradation with the O 3 dosage of 250 mg/h. Energy consumptions for 50% removal of cytotoxicity were 21.3 and 6.3 kWh/m 3 in electrochemical oxidation and UV/H 2 O 2 oxidation, respectively. The highest energy cost for 50% of genotoxicity removal was observed in electrochemical oxidation, while ozonation was identified as the most cost-effective process.
研究领域:
环境科学
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化学工程
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药学
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毒理学
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产品关联
DOI
高影响因子
Applied Sciences-Basel
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2020
·Vol. 10
·期 3
·894
·
IF 2.474
Jianhui Gu,Huimin Zang,Shun Yao,Xuejiao Wang,Minghui Zhu,Hang Song
Ionic liquids (ILs) are considered to be a new type of solvent due to their low vapor pressure, some unique properties and are expected to be used widely in the following days. Given their water solubility, stable chemical structure, and biological toxicity, ILs probably reach aquatic environments and become long-term pollutants. We studied the fate of benzothiazolium-based ionic liquids catalyzed by UV-H2O2in water. Due to the synergistic effect of UV and H2O2, the degradation efficiency can be significantly improved compared to any of them alone. Fitting results showed that the degradation reaction follows pseudo-first-order kinetics and reaction rate constants with hydroxyl radicals ranging from 0.0005 s−1to 0.0529 s−1. The experimental data showed that satisfactory results can be obtained at a temperature of 45 ℃, an initial concentration of ionic liquid of 0.1 M, and a hydrogen peroxide concentration of 0.1 M. We also explored the effects of chloride ions and pH on degradation reactions. In an appropriate situation, the degradation yield of [C4Bth]PF6could achieve 97% in 60 min and 99% in 90 min. The UV-H2O2combination process could provide an effective technique for the treatment of benzothiazolium-based ionic liquids in wastewater.Keywords:photocatalysis;degradation;benzothiazole ionic liquid;H2O2
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Marine Drugs
·
2024
·Vol. 22
·期 11
·499
·
IF 4.9
Biyang Zhu,Jiacheng Wang,Lijun You,Lianzhu Lin,Kuncheng Lin,Kseniya Hileuskaya
Calcium-chelated polysaccharides have been increasingly considered as promising calcium supplements. In this study, degraded fucoidans (DFs) with different molecular weights (Mws) were prepared after UV/H2O2treatment; their calcium-chelating capacities and intestinal absorption properties were also investigated. The results showed that the calcium-chelating capacities of DFs were improved with a decrease in Mw. This was mainly ascribed to the increased carboxyl content, which was caused by free-radical-mediated degradation. Meanwhile, the conformation of DF changed from a rod-like chain to a shorter and softer chain. The thermodynamic analysis demonstrated that DF binding to calcium was spontaneously driven by electrostatic interactions. Additionally, DF-Ca chelates with lower Mw showed favorable transport properties across a Caco-2 cell monolayer and could effectively accelerate the calcium influx through intestinal enterocytes. Furthermore, these chelates also exhibited a protective effect on the epithelial barrier by alleviating damage to tight junction proteins. These findings provide an effective free-radical-related approach for the development of polysaccharide-based calcium supplements with improved intestinal calcium transport ability.
研究领域:
食品科学
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营养学
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生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Yang Yu,Na Jiang,Yuanbo Zhou,Fei Huang,Yide He,Yongjun Zhang
Ofloxacin (OFX), commonly employed in the treatment of infectious diseases, is frequently detected in aquatic environments and poses potential ecological risks. UV/H 2 O 2 oxidation has been recognized as an efficient approach for removing antibiotics. In this study, Cu-doped waste-tire carbon was prepared and used as a UV/H 2 O 2 catalyst for the degradation of OFX. The results showed that the OFX removal was 89.3% within 90 min under the optimal reaction conditions. It was found that ZnO, used in the tire manufacturing to promote rubber vulcanization for enhanced stability and durability, played an important role in UV/H₂O₂ oxidation for OFX degradation. Toxicity experiments conducted with a microbial degradation respirometer demonstrated that the treated water exhibited low toxicity. This study introduces a sustainable catalyst derived from waste tires, and facilitating the development of metal-carbon catalysts for the effective removal of antibiotics from wastewater.
研究领域:
环境科学
·
生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Liwei Chen,Tianming Cai,Chuan Cheng,Zhuang Xiong,Dahu Ding
Acetamiprid (ACE) was degraded by using ultraviolet (UV) irradiation and UV based advanced oxidation processes (AOPs) including UV/hydrogen peroxide (UV/H 2 O 2 ) and UV/potassium persulfate (UV/PS). Among them, UV/PS process exhibited the best performance for the elimination of ACE and reduction of total organic carbon (TOC). The degradation kinetics was comprehensively compared in terms of dose of oxidants, solution pH, and water matrix species. A linear relationship was tentatively developed between the [Oxidant]/[ACE] ratio and the pseudo-first-order kinetic rate constant ( k ). The degradation was significantly inhibited at basic conditions no matter for UV/H 2 O 2 process or UV/PS process. The effects induced by the water matrix species including inorganic anions and natural organic matter (NOM) were also non-negligible. For UV/PS process, both SO 4 − and HO contributed to the ACE degradation, whereas only HO participated in the degradation in the UV/H 2 O 2 process. The corresponding second-order rate constants of ACE with HO and SO 4 − were determined to be 7.59 × 10 8 and 3.68 × 10 8 M −1 s −1 , respectively. Due to the different active radical species, different degradation products were detected through the HPLC-MS analysis. This work would be meaningful for the remediation of ACE from water by AOPs.
研究领域:
环境科学
·
化学
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DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2017
·Vol. 75
·期 12
·2935-2951
·
IF 1.197
Peng Mingguo,Li Huajie,Kang Xu,Du Erdeng,Li Dongdong
The removal of ibuprofen (IBP) in aqueous solution using UV/H 2 O 2 process was evaluated. The response surface methodology (RSM) and Box–Behnken design were employed to investigate the effects of process parameters on IBP removal, including the initial IBP concentration, H 2 O 2 dosage, UV light intensity, and initial pH value of solution. The RSM model developed herein fits well with the experiments, and provides a good insight into the OH radical irritated degradation mechanisms and kinetics. High resolution accurate mass spectrometry coupled with liquid chromatography was used to identify the degradation intermediates. A total of 23 degradation products were identified, including mono-hydroxylated products and dihydroxylated products. A series of OH radical-initiated reactions, including hydroxylation, dihydroxylation, decarboxylation, demethylation, ring break, lead to the final mineralization of IBP to CO 2 and H 2 O. UV/H 2 O 2 technology could be a promising technology for IBP removal in aqueous solution.
研究领域:
环境化学
·
水处理技术
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药物降解
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环境污染物治理
·
高级氧化技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）