SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Yanyi Wang,Xianze Meng,Hui Wu,Shengjun Bian,Yunbo Tong,Congjie Gao,Guiru Zhu
In this study, carboxyl group-functionalized carbon nanospheres (CNs–COOH) and silver-coated products (CNs–COOH/Ag) were successfully realized and used as nanofillers to fabricate thin-film nanocomposite (TFN) membranes via the interfacial polymerization of m -phenylenediamine (MPD) and trimesoyl chloride (TMC) solutions. The structure of the functionalized CNs modified TFN membranes (TFN–Cs–COOH, TFN–Cs–COOH/Ag) was significantly different from that of the CNs modified TFN (TFN–Cs) and TFC membranes, as the carboxyl groups in the nanofillers strongly influence the process of interfacial polymerization. The permeability and anti-fouling performances of the TFN membranes were significantly enhanced owing to the changes in the membrane structure. The water fluxes of the TFN–Cs–COOH and TFN–Cs–COOH/Ag membranes were respectively 91.9% and 73.2% higher than that of the TFC membrane, with the NaCl rejection exceeding 96%. The nanofillers of CNs–COOH/Ag with monodispersed silver nanoparticles (NPs) resulted in outstanding anti-bacterial performance in the TFN–Cs–COOH/Ag membrane. Overall, this work demonstrates that, when functionalized carbon NPs are used as nanofillers, the practical performance of TFN membranes can be improved for reverse osmosis.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
Case Studies in Construction Materials
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2022
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IF 4.934
Linsong Wu,Mengjun Mei,Zhen Li,Shuhua Liu,Xingzhi Wang
Photocatalytic pervious concrete pavement is a potential and sustainable new method for treating urban air and water pollution, and there is now an increasing amount of research on TiO 2 pervious concrete due to its excellent photocatalytic properties. In this study, pervious concrete with varying nano-TiO 2 contents (0 %, 1 %, 2 %, 5 %, 8 %) was prepared and evaluated for its performance in purifying methyl orange (MO). The results show that as the TiO 2 content increased from 0 % to 8 %, the photocatalytic degradation efficiency increased and then decreased, with the highest MO degradation rate of pervious concrete with 5 % TiO 2 content was 42.8 % at 120 min. However, as the TiO 2 content increases, the compressive strength and TiO 2 utilization rate of pervious concrete gradually decrease, and the 28-day compressive strength decreases from 26.0 MPa to 13.5 MPa. Therefore, 2 % TiO 2 content was determined to be optimal for pervious concrete.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2022
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IF 7.693
Demei Yu,Yongtong Fan,Chao Feng,Yuchao Wu,Wendi Liu,Tengfei Fu,Renhui Qiu
Pervious concrete made from epoxy resin suffers from high cost and is prone to cracking due to its inherent brittleness and aging. In this study, wood tar and formaldehyde, both easily available and low in cost, were used to modify epoxy resins via Mannich reaction. The resultant water from the reaction could facilitate cement hydration to form better adhesion with coarse aggregates as framework. Pervious concrete with modified epoxy resins demonstrated 21.9% improved compressive strength and 52.5% increased abrasion resistance, with comparable aging and frost resistance performance. The enhancing mechanism of modified epoxy resin was investigated by FTIR spectroscopy, DSC , and NMR analyses.
研究领域:
土木工程
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Zuolong Yu,Guiwei Rao,Yunxiao Wei,Jie Yu,Sihong Wu,Yupei Fang
Of late, the demand for food-packaging materials, in particular, multifunction packaging materials that are biodegradable; antibacterial; have good mechanical and barrier properties; and are edible and transparent, has increased considerably. In this study, we prepared chitosan (CS)/ε-polylysine (PL) biofilms with different CS-to-PL ratios. We studied the preparation, mechanical properties, microstructures, thermal stability, transparency, water-vapor permeability, oil permeability, and antibacterial properties of the composite CS/PL biofilms. The results demonstrate that CS/PL biofilms are mechanically strong, have good thermal stability, high transparency, low water-vapor and oil permeability, and extensive antibacterial properties that act against Escherichia coli , Bacillus subtilis , and yeast. Therefore, we therefore conclude that CS/PL biofilms are promising food-packaging materials.
研究领域:
高分子材料科学
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食品科学
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包装工程
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生物医学工程
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应用微生物学
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材料表征
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食品安全
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Chengjia Dan,Yue Wang,Daikuan Huang,Yang Cao,Dabin Zhang
Leakages of electrolytic manganese slag (EMS) disposal sites pose a significant threat to soil and groundwater, necessitating effective in situ remediation technologies. This study presents a multi-scale analysis to elucidate the enhanced impermeability mechanism of EMS composite modified by sodium polyacrylate (PAAS). By integrating macroscopic performance testing (compressive strength, permeability, corrosion resistance, and pollutant leaching), molecular dynamics (MD) simulations, and advanced spectroscopic/microscopic techniques (FTIR, XPS, and EDS mapping), we establish a direct link between macroscopic properties and underlying molecular-level interactions. Results demonstrate that an optimal PAAS/EMS mass ratio of 0.2 significantly enhances compressive strength (12.3-fold increase), reaching 2.78 MPa, and reduces the permeability coefficient to 1.318 × 10 −8 cm/s, with leachate concentrations meeting relevant water quality standards. This performance improvement stems from a synergistic multi-scale effect: macroscopically, well-dispersed PAAS forms a crosslinked network, filling structural defects within the EMR matrix and encapsulating the CaSO 4 ·2 H 2 O hard phase; at the molecular level, MD simulations reveal that PAAS chains undergo ion exchange (Na + with Mn 2+ ) and chelation (between -COO - and Mn 2+ ), forming a multi-crosslinked polymer network that densifies the microstructure and effectively impedes contaminant migration. FTIR and XPS analyses corroborate these molecular interactions, confirming that the enhanced impermeability arises from the synergistic effects of polymerization, ion exchange, and chelation. This study provides a new approach for controlling environmental risks associated with EMS, demonstrating the efficacy of multi-scale analysis in optimizing material performance.
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Manman Li,Yuling Yang,Lijing Zhu,Gang Wang,Zhixiang Zeng,Lixin Xue
Currently, thin-film composite (TFC) forward osmosis (FO) membranes are widely developed for wastewater purification, although it is a pressing subject to further improve its permeability, selectivity , and fouling resistance. Here, the polyvinylidene fluoride (PVDF) membranes were modified with dopamine (DA) and polyethyleneimine (PEI) via surface segregation during non-solvent induced phase separation (NIPS). And then some residual amine groups on the as-prepared PVDF/DA-PEI membranes participated in the reaction with 1,3,5-benzenetricarboxylic acid chloride (TMC) by interfacial polymerization (IP), forming the TFC FO membranes. Furthermore, they were co-deposited by tannic acid (TA) and taurine, engineering the tTFC FO membranes. The introduction of DA and PEI in the substrate enhances the selectivity of the membrane having a low specific reverse solute flux ( J s /J w ), and the TA-taurine layer improves the anti-fouling of the surface. Especially, tTFC6 (6 represents the weight concentration of DA and PEI in the substrate) has an excellent performance has a large J w of 42.10 ± 0.86 L m −2 h −1 , a low J s /J w of 0.06 ± 0.02 g/L, and a high flux recovery ( FRR ) of more than 90% using bovine serum albumin (BSA), sodium alginate (SA), and SiO 2 nanoparticles as model contaminants. The results provide new insights into the preparation of highly permeable and anti-fouling FO membranes.
研究领域:
材料科学
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环境工程
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膜技术
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Wan Su,Yufeng Zhang,Wenjuan Zhang,Shuting Xie,Xiaobo Sun,Jianqiang Meng
In this study, a nanofiltration (NF) polyamide hollow fiber thin film composite membrane with a low rejection and a high flux was prepared in consideration of the “trade-off” relation between salt rejection and permeate flux of the membrane. The membrane was able to retain the beneficial minerals in tap water while keeping the body healthy. The membrane prepared had a thinner active skin layer (<100 nm) than those of commercial membranes. A permeability of 30.07 L/m 2 /h and a rejection rate of 79.68% for 1,000 mg/L MgSO 4 at 0.2 MPa were obtained. In addiiton, Fe 3+ , Cu 2+ , and Pb 2+ were used to evaluate the heavy metal removal performance of the NF membrane. It was found that as the concentration of heavy metal ions increased to three times of the Standards for Drinking Water Quality (SDWQ) (GB5749-2006), and the rejections to all heavy metal ions were more than 76%. In addition, the NF membrane had a good long-term rejection stability for the heavy metal ions over a 12-month dynamic filtration experiment. The results showed that the newly prepared NF membrane has a good application prospect for domestic water purification.
研究领域:
环境科学
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材料科学
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膜技术
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水处理
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纳米技术
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化学工程
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公共卫生工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2025
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IF 9
Xuewu Zhu,Wenxin Yan,Hong Peng,Zhe Yang,Zhiwei Zhou,Daoji Wu,Liping Qiu,Daliang Xu,Ning Wang,Feiyong Chen
Regulating the nanofiltration (NF) membrane structure for the simultaneous improvement in permeance and selectivity has attracted extensive attention. In this study, ultraviolet (UV) irradiation was integrated in situ into a typical interfacial polymerization (IP) process to modulate the IP reaction precisely and thus modify the microscopic architecture of NF membranes. UV irradiation was capable of activating trimesoyl chloride (TMC) and inducing photothermal effects. The optimized NF membranes presented thinner and rougher surfaces, as well as an increased negative charge and hydrophilicity. Compared with the control NF membrane (NFM-Con), the optimized NFM-UV40 achieved excellent performance, with 35.5 % greater water permeance and 186.6 % greater Cl − /SO 4 2− separation selectivity. Notably, the UV-assisted NF membranes had better anti-fouling properties than those of commercial NF270. This study proposes a novel strategy for the precise in situ regulation of NF membrane structure and performance, enabling the development of high-performance separation membranes for NF-based water desalination.
研究领域:
材料科学
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膜技术
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水处理
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
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2022
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IF 6.212
Xiaohong Yu,Mian Wang,Yiwen Zhang,Xiaochen Liu,Xiaoyang Zhang,Jinbin Liu,Dujun Wang,Wenbin Jin,Yongmei Lyu
The green and high-value recycling of shrimp shell and straw remains a worldwide problem. This study aimed to investigate the potential utilization of a fermentation broth (FB) which contains shrimp shell and straw as a new source for preparation of biodegradable films. Aureobasidium pullulans and Photobacterium sp. LYM-1 were used in the fermentation. The cellulase activity was 115.92 U/mL and chitinase activity was 17.89 U/mL in FB. The polysaccharides concentration in FB was 1.05 mg/mL after 7 days of fermentation. An eco-friendly PVA-reinforced FB biodegradable film (FBBF) was successfully prepared and the effect of different plasticizers and surfactants on the mechanical, structural, and impermeability properties of the film was determined. The formation of new bonds between PVA and FB was proved by FTIR spectroscopy. The FBBF containing 0.25 % ( w/v ) glycerol and 0.01 % ( v/v ) tween-20 showed better strength properties. Elongation and water-swelling properties were highly improved by adding 0.2 % ( m/v ) citric acid. According to FE-SEM images, the smooth and tight surface of citric acid added FBBF was observed. Interestingly, the FBBF film showed good heat/moisture capacity, antifungal, and degradation properties. This report reveals a new green, and high-value recycling of straw and shrimp shell by the co-fermentation with A. pullulans and Photobacterium sp. LYM-1. It is also a novel way for the preparation of biodegradable film.
研究领域:
生物技术
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环境科学
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材料科学
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微生物学
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废物管理
✓ 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）