COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Chunchao Chen,Min Yu,Liyao Zhang,Rou Wang,Kanglu Feng,Kangwei Gongsun,Changming Bu,Houyi Ma,Xiang Gao
This study introduces an efficient method to enhance the corrosion resistance of copper using a low-concentration silane conversion film activated by sodium hypochlorite. The native chemical passivity of copper surfaces hinders effective bonding with 3-aminopropyltriethoxysilane, limiting protective performance even at high concentrations. The incorporation of NaClO into the silane solution promotes micro-etching, generating active Cu + /Cu 2+ ions that facilitate strong coordination with APTES via Cu–N and Si–O–Cu bonds. Electrochemical tests revealed a corrosion inhibition efficiency of 98.63 %—nearly 50 % higher than pure APTES films—while structural analyses confirmed denser, hydrophobic layers. This strategy significantly improves economic efficiency and broadens the application potential of silane-based coatings on copper.
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高影响因子
Algal Research-Biomass Biofuels and Bioproducts
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2026
·
IF 5
Ziqi Yu,Shiying Tang,Ming Du,Yong Zhao,Xiangrong Li,Ruihan Xu,Qixiang Zhou,Hui Zhou,Dandan Ren,Xiaoting Yu,Long Wu
TEMPO/NaClO/NaBr is applied to controlled degradation of fucoidan. • TEMPO/NaClO/NaBr enables efficient LMWF production from fucoidan in 0.5 h. • Galactose changes are consistent with possible C6 oxidation under TEMPO mediation • The TEMPO-free system caused 18.97% fucose loss and 6.13% sulfate loss. Low-molecular-weight fucoidan (LMWF) is highly desirable for food and pharmaceutical applications, yet conventional degradation methods often compromise its bioactive sulfate content. In this study, we employed a TEMPO/NaClO/NaBr system to degrade fucoidan under mild alkaline conditions and systematically investigated the degradation kinetics, structural changes, and anticoagulant activity of the resulting LMWF products. The degradation process was monitored by NaOH consumption and molecular weight distribution analysis. The optimal reaction time was determined to be 0.5 h, during which the molecular weight decreased from 337.4 kDa to 24.3 kDa, yielding LMWF with a relatively narrow molecular weight distribution (PDI = 1.08). Structural characterization by monosaccharide composition analysis, FT-IR, and 1 H NMR suggested that TEMPO-mediated oxidation favored oxidation at C6 primary hydroxyl groups, as indicated by changes in galactose and galacturonic acid contents, while no significant loss of total sulfate content was observed. In contrast, the non-selective NaClO/NaBr system caused substantial losses of fucose (18.97%) and total sulfate content (6.13%). Notably, the TEMPO-derived LMWF retained potent anticoagulant activity in the APTT assay while exerting a minimal effect on the PT pathway, suggesting a potentially lower bleeding risk. This study provides a promising strategy for the controlled preparation of LMWF with minimal loss of total sulfate content and a potentially favorable safety profile. Download: Download high-res image (175KB) Download: Download full-size image
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NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 8
·6274-6282
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IF 3.201
Shuang Chen,Hao Wu,Jing-han Hua,Jing-wen Yang,Hong-bin Zhang,Xue-qin Hu
Dextran is a polysaccharide with a high medicinal value. Thus, the chemical modifications of dextran, and the structural and physicochemical properties of its derivatives should be given focus. Dextran (Mw 5000 Da to 7500 Da) can complex with iron. In this study, dextran (Mw 5400 Da) was modified at different pH levels (8–14) by using NaOH and NaClO/NaBr. The carboxyl groups of the modified dextran were determined using infrared spectroscopy, and the carboxyl contents were compared. The results of high-performance liquid chromatography indicated that dextran was degraded during the modification. The crystallization and the structure of the carboxyl-modified dextran were investigated using X-ray diffraction, nuclear magnetic resonance, and quadrupole time-of-flight mass spectrometry. The physicochemical properties, i.e., solubility, and granule morphology, of the carboxyl-modified dextran were carefully characterized and compared. This work provides a theoretical foundation for the accurate selection of carboxyl-modified dextran and the development of a novel strategy for the preparation of metal complexes.
研究领域:
生物化学
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材料科学
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Bioresource Technology Reports
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2024
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IF 0
Yi Zhang,Yuqi Zou,Qiuyue Tao,Mingfeng Yang,Marie Harder,Han Wang,Bo Liang,Ioanna Ntaikou,Georgia Antonopoulou,Gerasimos Lyberatos
Polyhydroxyalkanoate (PHA) is a kind of cellular biopolymers, and a renewable alternative to conventional plastics. To promote low-cost PHA production, this study developed a simple and scalable process to recover this polymer from a phenol-fed mixed culture. Cultures containing >50 % PHA were first acidified then treated with NaClO, leading to digestion of cellular materials by HClO. NaClO dosage, HCl/NaClO ratio, and treatment time were tested for their effects on product Purity and Recovery rate. Compared with NaClO alone which obtained 55–74 % Purity and 57–73 % Recovery, acidification improved the extraction efficiency to 62–83 % Purity and 75–97 % Recovery of cellular PHA. Statistical analysis was performed on dosage, ratio and treatment time. The chemical cost of obtaining 1 kg pure PHA ranged $7–10, but can be greatly reduced by applying a denser culture. However, HClO reduced the molecular weight of the PHA products, which needs to be addressed in future studies.
研究领域:
生物高分子材料
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微生物发酵
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生物降解塑料
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ENVIRONMENTAL RESEARCH
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2025
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IF 7.7
Yupeng Wang,Xiangyuan Yu,Shulong Wen,Yihu Sun,Huibin Wei
The effective and economical removal of heavy metal-organic complexes remain an urgent challenge in the field of industrial wastewater treatment. In this study, Ca-doped ferrihydrite composites and Ca/Al co-doped ferrihydrite composites were synthesized via a simple one-step co-precipitation method and applied for the oxidative removal of EDTA-Cu in a hypochlorite system. The incorporation of Al significantly enhanced the material's stability. The Fe-Ca-Al composite exhibited a catalytic degradation efficiency of 97 % after 4 reaction cycles, representing a 32 % improvement compared to the Ca-doped ferrihydrite (Fe-Ca). Mechanistic studies revealed that the Fe-Ca-Al composite demonstrated strong selective adsorption of the organic moieties in EDTA-Cu over a broad pH range. Moreover, the oxygen vacancies (Ov) induced by Ca and Al co-doping played a crucial role in the enhanced catalytic performance and efficient removal of EDTA-Cu. These abundant Ov promoted electron transfer and provided numerous surface adsorption sites, facilitating the conversion of O 2 · - to 1 O 2 . Given that 1 O 2 can rapidly degrade organic compounds containing amino and carboxyl groups, it shows excellent potential for the treatment of EDTA-Cu. This study presents a highly active and reusable catalyst based on a Ca-Al doping strategy, offering a promising approach for the removal of organic-heavy metal complexes.
研究领域:
环境科学
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材料科学
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化学工程
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水污染控制
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催化化学
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高影响因子
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
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2019
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IF 1.536
Xiaofeng Wang,Beihai Zhou,Xia Shao
Dimethylamine-based pharmaceutical personal care products (DMA-based PPCPs) are a group of N-nitrosodimethylamine (NDMA) precursors. The acid dissociation constant (pKa) values of four DMA-based PPCPs were determined by potentiometric titration over the pH range of 3–11. The pKa values of ranitidine, nizatidine, doxylamine and carbinoxamine corresponding to the DMA moiety were 8.4, 6.8, 9.4 and 9.1, respectively. Competition reaction kinetics and pseudo-first-order reaction kinetics were used to determine the reaction rate constant (k) of the DMA-based PPCPs with O3, NaClO, ClO2 and KMnO4. Comparing the degradation rate constants of the four DMA-based PPCPs, the results of ClO2 oxidation were close, and for the other three oxidants, the order was kranitidine ≈ knizatidine > kdoxylamine ≈ kcarbinoxamine. Comparing the reaction rate of the four oxidants, for ranitidine and nizatidine, the order was kNaClO > kO3 > kKMnO4 > kClO2, and for doxylamine and carbinoxamine, the order was kO3 > kNaClO > kClO2 > kKMnO4.
研究领域:
环境科学
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化学动力学
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高影响因子
Journal of Water Process Engineering
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2025
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IF 6.7
Yunfeng Tan,Jiangzhou Qin,Shengquan Chang,Shengqiang Ma,Linan Su,Nengsheng Liu,Quanlin Zhao,Xintao Wang,Chenxi Li,Jinmao Ma,Kun Wu,Zhengfang Ye
The treatment of wastewater containing sodium azide (NaN 3 ) poses a major challenge to environmental protection and public safety. In this study, a multi-scale analysis method integrating experimental optimization, machine learning modeling and theoretical calculation was proposed. The mechanism and optimal conditions of NaN 3 removal by sodium hypochlorite (NaClO) oxidation were systematically studied. Through the combination of single factor experiment design and response surface method (RSM), the optimum treatment conditions were determined as follows: dilution factor was 300, NaClO dosage was 3.5 mL, and pH value was 6.0. Under these conditions, the removal rate of NaN 3 reached 96.53 %. In addition, the developed BP-GA hybrid neural network model showed excellent prediction performance (R 2 = 0.98805). After further optimization of process parameters, the removal rate of NaN 3 increased to 98.2 %. Density functional theory (DFT) calculations revealed the significant effects of pH value and intermediate HOCl on the reaction efficiency, and clarified the microscopic mechanism of the reaction. This study optimizes the treatment process of wastewater containing NaN 3 , which provides a theoretical basis for the design of a new efficient oxidation system and is of great significance for promoting sustainable wastewater treatment.
研究领域:
环境科学
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化学工程
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计算化学
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高影响因子
MOLECULES
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2024
·Vol. 29
·期 21
·5166
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IF 4.2
Peng Wang,Xu Zhang,Xi Le,Junjun Chen,Guangyan Zhang,Junjian An,Nianjie Feng,Junxian Xie
A thorough understanding of the lignin–carbohydrate complex (LCC) structure has a significant meaning in the high-value utilization of lignocellulose. In this work, the complex (DHPKGC) was obtained by an addition reaction between konjac glucomannan (KGM) and quinone methides generated in the synthesis of dehydrogenation polymers (DHPs) to simulate the formation of LCCs. The effect of pH on the prepared DHPKGC was investigated. The structure of the DHPKGC was characterized by Fourier Transform Infrared (FTIR),13C-Nuclear Magnetic Resonance (13C-NMR), and two-dimensional Heteronuclear Single Quantum Coherence Nuclear Magnetic Resonance (2D HSQC NMR) analyses. The results indicated the pH of 4.0 was conducive to the polymerization reaction between DHPs and oxidized KGM by the TEMPO/NaClO/NaBr system. In addition, the resultant DHPKGC was connected by benzyl ester linkages. Overall, this study aims to gain greater insight into the process of LCC formation in plants.
研究领域:
化学
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材料科学
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生物化学
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高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2019
·Vol. 41
·期 3
·1545-1557
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IF 3.252
Ye Bin,Cang Yan,Li Ji,Zhang Xiaolei
Chlorine dioxide (ClO 2 ) has been widely used in the process of preoxidation and disinfection as an excellent water treatment reagent. However, the inorganic by-products produced by ClO 2 , such as chlorite (ClO 2 − ) and chlorate (ClO 3 − ) are harmful to human health, and this has become a potential problem when using ClO 2 in drinking water treatment. In this study, ClO 2 alone and a ClO 2 /NaClO combination process were carried out to evaluate the algae removal efficiency of the treatment and the formation of disinfection by-products (DBPs: chlorite, chlorate, trihalomethanes and haloacetic acids) for high algae-laden water with 124.16 µg L −1 chlorophyll a (Chl.a) content. The results show that disinfection with 1.5 mg L −1 ClO 2 alone results in a ClO 2 − concentration exceeding 0.7 mg L −1 . ClO 2 preoxidation/ClO 2 disinfection is applicable for the control of effluent quality, but the ClO 2 − concentration still has an excessive risk when using 0.8 mg L −1 and 0.6 mg L −1 ClO 2 for the two process, respectively. In the ClO 2 /NaClO combination process, the ClO 2 − concentration is below 0.6 mg L −1 , and trihalomethane (THM) and haloacetic acid (HAA) concentrations are lower than 60% of the maximum contaminant levels (MCLs) set by the World Health Organization (WHO). Further, the formation of ClO 2 − is more effectively controlled by NaClO preoxidation/ClO 2 disinfection than ClO 2 preoxidation/NaClO disinfection.
研究领域:
环境科学
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水处理工程
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PubMed
高影响因子
CHEMOSPHERE
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2019
·
IF 5.108
Hua Wei,Yunong Tang,Tamer Shoeib,Aimin Li,Hu Yang
The preoxidation effects of H 2 O 2 , NaClO, and KMnO 4 on the dewaterability of sewage sludge were compared by analyzing the changes in specific resistance to filtration (SRF), filter cake moisture content (FCMC), extracellular polymeric substance (EPS) fractions and components, and floc properties. The three oxidants varied in oxidation efficiency and exhibited distinctive mechanisms. NaClO not only destroyed sludge flocs and EPSs but also effectively caused cell lysis, resulting in release of a considerable amount of organic matters and subsequently significant deterioration of dewatering performance. The oxidation of H 2 O 2 and KMnO 4 was relatively mild and occurred mainly on the outer layers of the sludge flocs and cell-bound EPSs. By contrast, the SRF and FCMC of the sludge conditioned with a low dose of KMnO 4 were slightly improved, and a fraction of soluble EPS was compressed because of the coagulation effect of the oxidation product MnO 2 . The pH of the sludge conditioned with H 2 O 2 and KMnO 4 showed no considerable change. Meanwhile, NaClO evidently increased the alkalinity of the sludge because of the hydrolysis effect. After the pH of the NaClO-treated sludge was readjusted to 7.0, the partial protonation efficiency slightly alleviated the deterioration of sludge dewatering performance. The preoxidized sludge was then subjected to reflocculation treatment using FeCl 3 , polyacrylamide, and a cationic starch-based flocculant , respectively. The combined treatment of preoxidation and reflocculation showed a high dewatering efficiency owing to their synergistic effect.
研究领域:
环境工程
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水处理
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化学工程
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PubMed
高影响因子
TEXTILE RESEARCH JOURNAL
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2017
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IF 1.443
Liu Liu,Yeping Xiang,Ruiyun Zhang,Bei Li,Jianyong Yu
In this study, different dosages of NaClO were used in the 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)-laccase degumming system to remove non-cellulosic materials, and their effects on the structure of hemp fibers were analyzed and discussed. A scanning electron microscope was used to depict the surface morphology of fibers after oxidative degumming under various dosages of NaClO in the TEMPO-laccase degumming system. Chemical composition analysis was used to determine the content changes of the different components. Meanwhile, the content of functional groups was also discussed. Fourier transfer infrared spectroscopy, nuclear magnetic resonance spectroscopy, and X-ray diffraction were employed to evaluate the microstructural changes of degummed hemp fibers obtained from the degumming processes with different dosages of NaClO. The results showed that after the TEMPO-laccase system degumming process with a NaClO dosage of 16%, the cleanest and smoothest surface of degummed fibers could be observed and the non-cellulosic materials were significantly removed without any crystalline transformation or damage in the cellulose. This research could shed light on determining favorable operation parameters for hemp oxidation degumming and increasing the degumming efficiency, as well as in the oxidation control and quality assurance of hemp fibers for textile downstream end uses.
研究领域:
材料科学
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化学工程
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纺织科学
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yujie Cheng,Yujia Zou,Shiwen Yu,Jiaqi Ding,Ying Wan,Lisan Cao,Jingwen Wang,Zongping Wang,Siyang Yue,Pengchao Xie
NaClO has been extensively used for controlling membrane fouling in water and wastewater treatment processes , with bacteria being a common foulant in long-term ultrafiltration . However, the potential impact of NaClO cleaning on membrane structure and the formation of halogenated by-products remains unclear. This study comprehensively investigated the variation of membrane characteristics and formation of halogenated by-products during the chemical cleaning of Escherichia coli ( E. coli ) cell-fouled membrane using NaClO solution. The feed water containing E. coli cells resulted in severe membrane fouling by forming a dense cake layer, while NaClO cleaning achieved complete restoration of membrane flux under optimal conditions. The cleaning performance was compromised under high temperature and acidic conditions due to the lysis of E. coli cells and the limited oxidative capability of HClO. Excellent chemical resistance of polyethersulfone membrane against NaClO was confirmed under appropriate operational conditions. The biofouling and membrane materials played critical roles as precursors in the formation of halogenated chemicals during NaClO cleaning, and the generation pattern of by-products is highly dependent on the composition of membrane foulants. Increasing E. coli concentration, NaClO dosage, temperature and blending time led to the monotonical accumulation of almost all eleven representative by-products. As solution pH rose continuously, several by-products including trichloroacetic acid and chloral hydrate exhibited an initial increasing then decreasing trend, which could be attributed to the relative quantities between their formation and decomposition rates.
研究领域:
环境科学
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水处理工程
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微生物学
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高影响因子
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