Desalination and Water Treatment
·
2024
·
IF 1
Kaizhen Wang,Danrong Cai,Die Zou,Ruxue Duan,Wentao Yan,Yong Zhou,Congjie Gao
Developing ultrafiltration (UF) membranes with excellent anti-biological fouling and overcoming the hydrophobicity of membrane material itself has been a major challenge. While exposing a major drawback of being unstable and easily lost from the membrane, silver nanoparticles (AgNPs) are still used as bactericidal substances in membranes. Polyamic acid (PAA) is a flexible hydrophilic polymer that exhibits strong complexing ability and considerable steric hindrance effect on metal cations. Herein, using PAA as a stabilizer to modify the size and dispersion of silver nanoparticles (AgNPs), we developed a polyethersulfone (PES) UF membrane featuring both hydrophilic and antibacterial dual functions. The AgNPs in the as-prepared membrane were small in size (around 3–10 nm) and highly dispersed in the membrane, exhibiting highly efficient antibacterial ability with 96.82% and 98.29% inhibition towards Escherichia coli and Staphylococcus aureus , respectively. Meanwhile, the partially covered AgNPs by PAA and the high surface energy made them less susceptible to lose in the membrane. The developed membrane retained about 4.5 times more AgNPs than the original membrane for the same membrane area. Moreover, the favorable hydrophilic and pore structure endowed the membrane with high water flux and acceptable rejection of bovine serum albumin (BSA). The PES/PAA-Ag membrane exhibited an excellent water flux, which was 421.47 (L/m 2 ·h) under 1 bar pressure, about 1.4 times of PES and 3.4 times of PES-Ag membrane (with a high BSA rejection, around 90%). This work provided a reference for the development of hydrophilic and antimicrobial membranes, as well as having considerable potential practical value.
研究领域:
材料科学
·
化学工程
·
纳米技术
·
环境科学
·
膜技术
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xuzhao Shi,Wei Song,Tao Wei,Kui Zhang,Zhigang Shao
The anode Pt catalyst of a proton-exchange membrane fuel cell (PEMFC) is susceptible to poisoning by trace amounts of CO in hydrogen, which restricts its large-scale commercialisation. Therefore, developing PEMFC catalysts with CO tolerance is crucial as it would reduce the requirement for hydrogen purity. In this study, we present a CO-tolerant catalyst for the PEMFC anode synthesised by loading Pt onto a polyaniline-modified conductive carbon composite support (Pt/C-PANI). The results showed that the catalyst containing 5% PANI in the composite support (Pt/C-PANI-5) exhibited optimal hydrogen oxidation reaction activity and CO tolerance. Electrochemical tests showed that the current drop of Pt/C-PANI-5 was 6.8%, compared to 20% and 12% for Pt/C-sys and commercial PtRu/C catalysts, respectively. Furthermore, results of the single-cell test confirmed improved CO tolerance. These findings provide a potential solution for developing cost-effective fuel cell catalysts with improved CO tolerance.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Siming Huang,Jianqiao Xu,Xuan Tao,Xiao Chen,Fang Zhu,Ying Wang,Ruifen Jiang,Gangfeng Ouyang
Polyaniline/silver (PANI/Ag) composites were prepared with a one-step synthesis method, and fabricated into solid-phase microextraction fiber coatings through three different means, i.e. in situ growth, gluing and chemical bonding. This work explored the utility of the as-fabricated PANI/Ag SPME fibers as dual-functional platforms for microextraction and matrix-free laser desorption/ionization (LDI) of the target analyte. The results showed that after incorporating Ag into the PANI polymer , the LDI efficiency was improved by over two times, which was 92.8% the LDI efficiency of the commercial LDI plate. In addition, the in situ grown fiber coatings were observed the most sensitive as dual platforms for the analysis of bifenthrin . The signal intensity was increased over twenty times by using in situ grown fiber, comparing to direct analysis with commercial LDI plate, which were attributed to the excellent extraction ability of PANI backbone, as well as the high LDI efficiency of the PANI/Ag composites. Low detection limit (lower than 10 ng L −1 ) and good fiber-to-fiber repeatability (relative standard deviation 11.0%, n=3) were obtained by using the in situ grown coating for the analysis of bifenthrin , and bifenthrin in real water samples was successfully analyzed. The work successfully coupled SPME with matrix-free LDI, which greatly simplified the analytical process and improved the analytical sensitivity.
研究领域:
分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Jun Lv,Chen Chen,Chao Qian,Wanyi Chen,Yang Xiang,Juan Zhang
A colorimetric sensing method has been proposed for the detection of β-lactamase (β-Lac) activity and the screening of the inhibitors in this work. The method is based on the aggregation of AuNPs induced by 2-amino-3-mercapto-3-methylbutanoic acid (AMMBA) through the formation of Au-S bond and electrostatic interaction . Since AMMBA can form through β-Lac catalyzed hydrolysis and Cu(II)-mediated redox with penicillin as enzyme substrate, β-Lac activity is related to the extent of AuNPs aggregation. The enzyme activity can be determined at levels as low as 0.556 U/mL and over a linear detection range as wide as from 0 U/mL to 30 U/mL. Furthermore, the inhibitory effects of clavulanic acid and sulbactam on the activity of β-Lac have also been tested and given IC 50 values of 0.92 μM and 0.06 μM, respectively. The proposed method can be not only used for the detection of β-Lac activity but also the screening of the inhibitor.
研究领域:
生物化学
·
医学诊断
·
分析化学
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2019
·Vol. 79
·期 9
·1648-1656
·
IF 1.624
Wang Fei,Lü Hongmei,Wang Xiujun,Jing Bo,Duan Ming,Xiong Yan,Fang Shenwen
There are residual polymers in the oily wastewater produced from polymer flooding (OWPF); keeping the residual polymer in the water during the flocculation is meaningful and challenging. In this paper, a selective flocculant (denoted as PDC10) which can remove the oil while keeping partially hydrolyzed polyacrylamide (HPAM) in water was prepared by copolymerization of decyl two methyl vinylbenzyl ammonium chloride (C10MVBA) and dimethyl aminopropyl methacryamide (DMAPMA). By using oil removal and HPAM retention as evaluation indexes, the synthesis condition of PDC10 was optimized. The optimum PDC10 exhibited oil removal of 98.0% and HPAM retention of 80.5%. Its HPAM retention is much higher than that of a regular cationic flocculant. Measurements of zeta potential, interfacial tension, interfacial dilational modulus and a dual polarization interferometry (DPI) test were carried out for investigating the flocculation mechanism of PDC10. The mechanism of PDC10 was that it can bridge and flocculate oil droplets by electrostatic interaction and hydrophobic interaction. It also preferred to distribute at the interface, and its interaction with HPAM in bulk water was weak, which confirms its selective flocculation properties.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2020
·Vol. 221
·期 13
·2000145
·
IF 2.335
Bo Zhang,Xiaoxiao Li,Yumeng Tian,Jie Wang,Xiaoli Zhao,Xiaoniu Yang
The use of low molecular weight (LMw) aliphatic diamines for the synthesis of polyurethane-urea elastomers (PUUEs) is an effective method for introducing abundant, strong hydrogen bonds with the aim of improving the thermal and mechanical properties of PUUEs. However, the reaction between isocyanates and LMw aliphatic diamines is too rapid to produce PUUEs. In this study, PUUEs incorporating LMw aliphatic diamines as chain extenders are prepared via the reversible reaction of CO 2 with diamines. The phase separation, thermal properties, and thermomechanical and mechanical properties of polyurethane materials are investigated as the chain extender changed from diol to diamine. Replacing the diol chain extenders with diamine results in the formation of more abundant and stronger hydrogen bonds in PUUEs, which enables the assembly of long range ordered structures and improved microphase separation. The tensile strengths of PUUEs, from 8.4 to 13 MPa, are much higher than their corresponding polyurethanes, owing to the physical crosslinks formed by the more and stronger hydrogen bonds in the PUUEs.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 4.1
Li Ying,Pan Chen,Gan Feng,Lin Zhi-Xun,Yu Jin-Chao,Wei Zhen-Zhen,Zhao Yan
Electrospun nanofibrous separators, despite lacking superior mechanical strength, have gained widespread attention with high porosity and facile processing. Herein, utilizing the fact that thermal imidization temperature of poly(amic acid) (PAA) into polyimide (PI) coincides with the pre-oxidation temperature of polyacrylonitrile (PAN) into carbon fiber, we proposed a new cross-electrospinning strategy to obtain a composite nanofibrous separator (PI/oPAN) randomly interwoven by PI and pre-oxidized PAN (oPAN) nanofibers, via synchronously electrospinning the PAA and PAN onto the same collector and then heat-treating for 2 h at 300 °C. The resultant PI/oPAN separator was able to preserve high porosity (71.7%), electrolyte wettability and thermal stability of PI nanofibrous membrane, and surprisingly exhibited high mechanical strength, being 3 times of PI, which mainly because of the numerous adhesion points generated by the melting of PAN in the pre-oxidation process. Meanwhile, the polar groups of oPAN and 3D fibrous network enhanced the PI/oPAN separator’s ionic conductivity and Li + transference number, rendering the corresponding cell with more stable cycling performance than cells assembled with pure PI, PAN or commercial PP separator. Therefore, this work might provide a new avenue for the ongoing design and further development of LIB separators capable of high safety and high performance.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF RAMAN SPECTROSCOPY
·
2017
·Vol. 49
·期 2
·245-255
·
IF 2.969
Xiu Liang,Xiao-Juan Zhang,Ting-Ting You,Nan Yang,Guang-Sheng Wang,Peng-Gang Yin
MoS 2 , a novel inorganic graphene analogues with typical two-dimensional structure, has attracted increasing interest in various fields. MoS 2 -based hybrid plasmonic structures have been extensively investigated as higher quality surface enhanced Raman scattering (SERS) substrates. Herein, we have designed a three-dimensional (3D) MoS 2 nanospheres (NSs) based hybrid nanostructure as SERS sensor by decorating Au nanoparticles (NPs) on the surface of 3D MoS 2 -NSs (3D MoS 2 -NS@Au-NPs). 3D MoS 2 -NSs acts as (a) a stable scaffold for Au NPs decoration via microwave-irradiation hydrothermal process, (b) a chemical mechanism source for Raman enhancement, and (c) a 3D spatial structure for generation of more effective hot spots due to Au coupling effect and supply larger surface area for adsorbing probe molecules. The 3D MoS 2 -NS@Au-NPs hybrid structure exhibits 56-fold improvement on enhancement factor compared to two-dimensional MoS 2 -NST@Au-NPs hybrid structures. SERS performance was easily and effectively optimized with the tuning of the density and sizes of Au NPs. The optimized 3D MoS 2 -NS@Au-NPs was applied as SERS sensor for melamine detection in milk. Quantitative detection was realized in the range of 1 ppb–10 ppm with a linear coefficient of .997. Excellent sensitivity of 1 ppb and uniformity of 10.12% relative standard deviation was achieved, which could meet the demand for melamine detection as prescribed by the U.S. Food and Drug Administration.
研究领域:
材料科学
·
分析化学
·
食品安全
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Shoutao Ma,Qiang Yu,Yafei Hou,Jinfang Li,Yuan Li,Zhanhua Ma,Lanyi Sun
Coal tar is a byproduct of low temperature coal carbonization. The separation of the compounds has great significance since its main component is the mixture of phenols and hydrocarbons. In this paper, the separation of specific phenolic compounds from model coal tar (phenols + hexane) was studied. The solvent was screened by empirical analysis, the universal quasichemical functional group activity coefficient (UNIFAC), and conductor-like screening model COSMO-SAC (segment activity coefficient). COSMO-SAC was used to calculate the capacity, selectivity, and performance index of solvents. Finally, the monoethanolamine (MEA) was selected as the solvent to extract the phenols. The liquid–liquid equilibrium for the ternary mixture of phenols + hexane + MEA was measured at 303.15 K and 323.15 K under atmospheric pressure, and the results showed that MEA provided a high distribution coefficient, efficiency, and selectivity for phenols. Meanwhile, the extraction process of phenols was simulated based on the nonrandom two-liquid (NRTL) model, for which binary interaction parameters were obtained through calculations of phase equilibrium. The results showed that the purity of phenols can achieve more than 99.5 wt % using MEA as a solvent.
研究领域:
化学工程
·
分离科学
·
热力学
·
燃料化学
·
环境化工
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Fei Li,Ying Wang,Ri-Sheng Bai,Xiao-Xue Wang,Ma-Lin Li,Ji-Jing Xu
The issue of cathode passivation during cycling resulting in rapid capacity fading and premature battery death is a major challenge that hinders the applications of lithium–oxygen (Li–O 2 ) batteries. Here, a facile strategy of introducing a functional separator based on flexible amination SiO 2 /TiO 2 inorganic woven film (STON WF) is proposed to suppress the cathode passivation problem. The by-products, i.e. HCOOLi, CH 3 COOLi and Li 2 CO 3 can be selectively adsorbed on the STON WF separator preferably compared with the cathode and further proved by the density functional theory (DFT) calculations. Thus, benefiting from the separator, the Li–O 2 cells with super P carbon and catalyst-free cathode show enhanced electrochemical performance (5645 mA h g −1 at a current density of 200 mA g −1 ), good rate capability (discharge voltage of 2.43 V at a current density of 1.5 A g −1 ) and especially superior cycle stability up to 268 cycles. These findings present a promising approach to prevent the premature battery death.
研究领域:
电化学
·
能源材料
·
纳米材料
·
表面化学
·
电池技术
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Xi Quan Cheng,Zhen Xing Wang,Jing Guo,Jun Ma,Lu Shao
Multifunctional coatings derived from bioinspired dopamine (DA) have attracted a lot of attention for water environmental remediation recently. Nevertheless, the high cost of DA monomers seriously hampers their broad application. Herein, an elegant multifunctional coating, which could be deployed as a selective adsorbent or loose nanofiltration membrane for removing of dyes and antibiotics from water, was designed based on the Michael-addition and Schiff-base reactions between cost-effective plant-derived gallic acid (GA) and branched polyethylenimine (PEI) at room temperature. Aside from the extremely low cost of GA (about 5% of that of DA), the resultant GA/PEI coatings possessed much better performance than DA/PEI coatings. When deployed as a dye adsorbent, the bioinspired GA/PEI coatings exhibited much higher selectivity, showing 40% increase in anionic dye adsorptive capability and 30% decline in cationic dye adsorptive capability compared with DA/PEI coatings. When applied as a nanofiltration membrane to separate antibiotic solutions, the multifunctional coatings demonstrated solution flux as high as 41.3 L m–2 h–1 at 5 bar alongside 96.2% azithromycin (AH) rejection, showing a 20% increase in flux and 10% increase in rejection compared with DA/PEI nanofiltration membranes. Therefore, our cost-effective multifunctional GA/PEI coatings show promise for use in sustainable water remediation applications.
研究领域:
环境科学
·
材料科学
·
水处理技术
·
可持续发展
·
表面化学
·
功能材料
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zhuan-nian Liu,A.-ping Fan,Xiao-gang Han,Habiba Shapour,Qing-yun Zhang
The chelating adsorbent PEI-MIL-101(Cr) was prepared by introducing polyethyleneimine (PEI) into the MIL-101(Cr) channel in this paper. X-ray diffractometer, Fourier transform infrared spectrometer and scanning electron microscope were applied to characterize the structure and morphology of MIL-101(Cr) and PEI-MIL-101(Cr). The adsorption properties and mechanism of the MIL-101(Cr) and PEI-MIL-101(Cr) to Cr(VI) were studied. The results showed that adsorption capacity of PEI-MIL-101(Cr) for Cr(VI) was obviously better than MIL-101(Cr). The adsorption isotherm of Cr(VI) onto MIL-101(Cr) and PEI-MIL-101(Cr) can be described by Langmuir model. The maximum adsorption amount for Cr(VI) onto MIL-101(Cr) and 30% PEI-MIL-101(Cr) was 61.99 and 40.34 mg/g. The adsorption kinetic data of the two adsorbents followed the pseudo second-order model. The negative values ΔH and ΔG illustrate that the process is spontaneous and exothermic. PEI-MIL-101(Cr) can be reused for four times.
研究领域:
环境化学
·
材料科学
·
污染控制
·
吸附技术
·
功能材料
·
水污染治理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）