CHEMOSPHERE
·
2023
·
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
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zijian Song,Ben Wang,Wu Yang,Tao Chen,Chuan Ma,Lushi Sun
Fe 2.5 M 0.5 O 4 (M = Mn, Ti and Cu) were investigated for the first time as the catalyst for simultaneous removal of NO and SO 2 through catalytic oxidation-absorption with vaporized H 2 O 2 . The physicochemical properties of as-prepared catalysts were comprehensively characterized by XRD, SEM, TEM, BET, XPS, TPR, VSM, TG and PL analyses. Activity test results showed that SO 2 can be completely removed under most conditions. However, NO removal was affected by catalyst, H 2 O 2 consumption, reaction temperature, GHSV and coexistence gases (i.e., H 2 O, O 2 , NO and SO 2 ). Mn, Ti and Cu doping in the magnetite can remarkably enhance NO removal. Redox pairs and oxygen vacancy of catalysts were considered as vital factors affecting OH generation. Base on the catalyst characterization and DFT calculation results, the main mechanism of Mn, Ti and Cu doping on the catalytic activity improvement was explained as follows: (a) Mn, Ti and Cu doping can increase the catalyst surface area; (b) Ti on the surface can directly promote the catalytic decomposition of H 2 O 2 ; and (c) Mn and Cu doping can promote the generation of oxygen vacancy and indirectly increase the activity. Moreover, two arrangement forms of an industrial simultaneous removal system for NO, SO 2 and Hg 0 were proposed.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xue-Meng Fan,Hou-Yong Yu,Duan-Chao Wang,Zhong-Hao Mao,Juming Yao,Kam Chiu Tam
A simple and eco-friendly Fe2+/H2O2 oxidation of microcrystalline celluloses (MCCs) to prepare cellulose nanocrystals (CNCs) with high carboxylation content is proposed. The effects of reaction times on the morphology, microstructure, and chemical and thermal properties of isolated carboxylated CNCs were investigated. The oxidative decomposition of Fe2+/H2O2 solution of MCC yielded CNCs with a size of 92–140 nm in length and 19–23 nm in width. The CNCs extracted at 6 h possessed the highest carboxyl content (2.2 mmol/g) with a zeta potential of −41 mV and a thermal decomposition temperature of greater than 325 °C. These CNCs are efficient adsorbents for dyes (methylene blue) and metal ions (copper ion) found in wastewater, with removal rates of up to 95.6 and 82.3%, respectively.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
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
FUEL
·
2025
·
IF 7.5
Kaiwei Wang,Hao Ruan,Fumin Wang,Yi Zhai,Mingshuai Sun,Yan Chen,Jiaxing Zhang,Yihao Wang,Xuyang Zou,Xubin Zhang
The construction of abundant TiO 6 active sites within the zeolite framework is essential for further enhancing the catalytic performance of TS-1 zeolite. Here, we employ a strategy involving treatment with a mixture of amines and ammonium salts to generate abundant TiO 6 species within zeolites synthesized with the assistance of N,N-dimethylformamide (DMF). It was observed that during the post-treatment process, the presence of amines and ammonium salts plays a key role for the formation of highly active TiO 6 species. The incorporation of DMF can significantly enhance the TiO 6 content in the post-treated zeolite, increasing it to 61.5 % compared with 28.5 % in the zeolite synthesized without DMF. The effect of the DMF/SiO 2 ratio in the synthesized gel on the morphology and catalytic performance was also examined. It is noteworthy that the incorporation of DMF influences the microenvironment of the Ti active sites following post-treatment. 1 H MAS NMR analysis reveals that the characteristic peaks corresponding to Ti-OH and isolated Si-OH groups in the DMF-synthesized catalyst are significantly intensified after treatment with amines and ammonium salts. When H 2 O 2 is employed as an oxidant, the optimal catalytic performance achieves a cyclohexene conversion of 51.1 % and a cyclohexene oxide yield of 39.4 %, with a high TOF value of 92.77 h −1 . Notably, the catalyst exhibits a significantly conversion rate of 79.4 % and a yield of 72.7 % using O 2 as the oxidant.
研究领域:
催化化学
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材料科学
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无机化学
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石油化工
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绿色氧化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
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2025
·
IF 6.7
Xiang Gong,Suqi Li,Xiulan Guo,Jiaqiao Yuan,Hongyu Lu,Shuming Wen,Pan Yu,Shaojun Bai,Dandan Wu
This work investigates the efficiency removal and mechanism of xanthate from flotation tailings wastewater through a coagulation-Fenton oxidation process by introducing Fe 2+ and Mn 2+ to activate H 2 O 2 . Under the conditions of initial 60 mg/L SBX concentration, 50 mg/L H 2 O 2 concentration, 25 mg/L Fe 2+ concentration, 25 mg/L Mn 2+ concentration, 3.5 initial pH, and 60 min reaction time, the degradation rate of xanthate was more than 98 %. The H 2 O 2 + Fe 2+ +Mn 2+ system exhibits markedly superior degradation efficiency for SBX. The results demonstrate that the Fe 2+ +Mn 2+ bimetallic system in simulated AMD facilitates the activation of H 2 O 2 to generate a greater abundance of hydroxyl radicals (•OH). Through characterization of degradation products and analysis of intermediates, two potential degradation pathways of SBX are proposed. In the first pathway, SBX initially undergoes conversion to BPX, which subsequently degrades into small molecular compounds including CO 2 , H 2 O, and SO 4 2− under sustained •OH radical attack. The secondary pathway involves the formation of precipitates composed of xanthates metal (Fe/Mn), iron oxides, and manganese oxides. This work presents a new strategy for efficiently degrading xanthate contaminants in mineral flotation wastewater. It also valorizes AMD by exploiting its intrinsic properties, thereby mitigating AMD's environmental hazards at the source.
研究领域:
环境工程
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化学工程
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矿物加工
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废水处理
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高级氧化工艺
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产品关联
DOI
高影响因子
Food & Function
·
2022
·Vol. 13
·期 3
·1472-1481
·
IF 6.317
Jiaxuan Li,Yu Li,Xuedi Zhang,Song Miao,Mingqian Tan,Wentao Su
Fruit juice is one of the most popular drinks, which requires strict processing conditions to ensure its quality, especially to prevent enzymatic browning and turbidity loss. In this work, a new strategy for the preparation of composite nanofibers for juice clarification and anti-browning control was proposed. The strategy used microfluidic spinning to combine Fucoxanthin (Fx), hydroxypropyl-γ-cyclodextrin (HP-γ-CD) and polyvinyl pyrrolidone (PVP) to prepare Fx/HP-γ-CD-PVP (PCF) nanofibers, which not only reflected the excellent antioxidant properties of cyclodextrin-wrapped Fx, but also achieved a more optimized juice clarification agent dosage. Molecular docking technique was used to prove that the stable inclusion complex of Fx and HP-γ-CD could be formed by hydrogen bonding when the molar ratio of Fx to HP-γ-CD was 1 : 2, and the binding energy was as low as −10.23 kcal mol−1. SEM, XRD, FT-IR and TGA were used to characterize the structure of the composite nanofibers, which showed that the thermal stability and water solubility of the embedded Fx were improved. Further studies showed that the apple juice with PCF nanofibers containing inclusion complexes of Fx and HP-γ-CD at a molar ratio of 1 : 2 (PCF 1 : 2) could significantly improve the DPPH and ABTS radical scavenging activity, and could significantly protect the cell membrane integrity of RAW264.7 cells against H2O2 oxidative damage. Finally, the effects of PCF nanofibers on the quality of fresh juice were studied, including clarification experiment and sensory evaluation. The results showed that the dosage of PVP in PCF 1 : 2 was only about 4% of the conventional dosage, and the browning index of fresh juice was significantly reduced with the best clarification. The available data provided in this study would provide a promising safety strategy for the food processing of fresh juice and the extension of its storage life.
研究领域:
食品科学
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纳米技术
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生物技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 10
·4437-4445
·
IF 2.7
Ran Zhang,Shaohong Zhang,Junhao Lu,Ying Wu,Jinjin Zhao,Zhijuan Wang
Nanozymes have attracted much attention as a new type of artificial enzyme with great development potential in recent years. Here, a cubic Co and N co-doped porous carbon material (Co-HPNC@NC) was synthesized through the calcination of PDA-modified bimetallic Co–Zn ZIFs. Co-HPNC@NC exhibits exceptionally high oxidase-mimicking activity and effectively oxidizes the colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue-colored oxidized TMB (oxTMB) without H2O2. However, the formation of oxTMB was inhibited by the addition of L-cysteine (L-Cys). Therefore, the blue color faded to colorless, causing a notable decrease in absorbance. Furthermore, Co-HPNC@NC showed good selectivity and anti-interference ability toward the detection of L-Cys. As a result, a sensitive and efficient colorimetric method has been developed to determine L-Cys with a low detection limit of 0.17 μM (3σ). It is believed that this colorimetric method for the detection of L-Cys based on Co-HPNC@NC will show potential applications in biosensors and medical diagnosis.
研究领域:
材料科学
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纳米技术
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分析化学
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生物传感
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医学诊断
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）