Journal of Water Process Engineering
·
2023
·
IF 7
Xiaolei Wang,Shurui Han,Yaxian Xue,Bing Zhang,Huan Zhang,Huicai Wang,Jing Feng,Junfu Wei
Polyester nanofiltration membranes with a loose selective layer are highly promising for separating dyes and salts. In this study, three anti-fouling polyester nanofiltration membranes were prepared by interfacial polymerization of xylitol (E967), xylitol/β-cyclodextrin (E967/β-CD), and xylitol/sodium alginate (E967/SA) with trimesoyl chloride on a polyethersulfone (PES) substrate. The chemical structure, morphology, pore size, hydrophilicity and zeta potential of three polyester membranes were characterized. The preparation conditions, separation performance for dyes and salts, and anti-fouling properties were studied. The results indicated that the addition of β-CD or SA inhibited the esterification reaction, resulting in a thin and loose polyester layer. The polyester layer thicknesses of the PES/E967/β-CD and PES/E967/SA membranes were 92 nm and 79 nm, respectively. In addition, the hydrophilicity and electronegativity of the polyester layer were enhanced. Three polyester membranes all showed a rejection of >99.5 % for Congo red. The permeance of the PES/E967/β-CD membrane was the highest (18.3 L·m −2 ·h −1 ·bar −1 ), whereas the NaCl rejection of the PES/E967/SA membrane was the lowest (9.1 %). Compared with the PES/E967 membrane, the fouled PES/E967/β-CD and PES/E967/SA membranes had longer wash cycles, suggesting an advantage in dye/salt separation.
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Yuanqing Luo,Xiaoyong Zhao,Pengfei Cai,Yuanjiang Pan
A facile one-pot synthetic method for preparing gold nanoparticles by employing sugammadex (SUG), a carboxylic acid functionalized γ -cyclodextrin derivative, as reducing-cum-stabilizing agent herein was reported for the first time. The SUG protected gold nanoparticles (SUG-AuNPs) can work as a colorimetric sensor for visual chiral recognition of α -amino acids enantiomers, especially for lysine (Lys) and asparagine (Asn) enantiomers. The chiral recognition assay was successfully applied to determining the enantiometric excess of L-Lys and L-Asn ranging from −100 % to 100 % respectively. Moreover, the prepared SUG-AuNPs was found to exhibit efficient catalytic activity towards the reduction of toxic 4-nitrophenol by NaBH 4 and the efficiency of the system was further demonstrated through the reduction of other typical nitroaromatics under mild condition. The as-synthesized SUG-AuNPs shows good performance for both chiral sensing and reduction activity and thus may facilitate the practical application in the area of both chiral discrimination and catalysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Chao Wu,Xiaoping Wang,Tongren Zhu,Pan Li,Shengji Xia
With the increasing demand of high water-quality, membrane filtration technologies are playing further important roles in water treatment owing to their small footprints, reduced use of chemicals and stable performances. However, the inherent permeability-selectivity trade-off is still a significant obstacle restricting the broad applications of membrane separation. Hydrophilic modification via doping nanoparticles into membranes is considered an effective solution to improve the permeability while maintaining selectivity . However, agglomeration of nanoparticles often results in inhomogeneity of the modified membranes. In this study, hybrid membranes with separated covalent organic framework (COF) particles that were uniformly embedded in the membrane surface pores were firstly fabricated via acetic-acid-catalyzed in situ synthesis . Owing to the ample hydrophilic chemical groups and tunable molecular transport channels in COFs, the modified membranes yielded almost twice higher water flux (about 200 L m −2 ·h −1 ·bar) than the pristine membranes with simultaneously enhanced rejection of water pollutants (i.e., dyes). In addition, the pure organic structure of COF improves the polymer-filler interaction of the mixed film, thereby reducing the risk of leakage . Therefore, the hybrid membranes also exhibited relatively high stability in long-term operations and different pH conditions, which makes them promising candidates in future membrane applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2020
·Vol. 20
·期 4
·1065
·
IF 3.275
Huihui Zhang,Wenqing Shao,Shanshan Qiu,Jun Wang,Zhenbo Wei
Aroma and taste are the most important attributes of alcoholic beverages. In the study, the self-developed electronic tongue (e-tongue) and electronic nose (e-nose) were used for evaluating the marked ages of rice wines. Six types of feature data sets (e-tongue data set, e-nose data set, direct-fusion data set, weighted-fusion data set, optimized direct-fusion data set, and optimized weighted-fusion data set) were used for identifying rice wines with different wine ages. Pearson coefficient analysis and variance inflation factor (VIF) analysis were used to optimize the fusion matrixes by removing the multicollinear information. Two types of discrimination methods (principal component analysis (PCA) and locality preserving projections (LPP)) were used for classifying rice wines, and LPP performed better than PCA in the discrimination work. The best result was obtained by LPP based on the weighted-fusion data set, and all the samples could be classified clearly in the LPP plot. Therefore, the weighted-fusion data were used as independent variables of partial least squares regression, extreme learning machine, and support vector machines (LIBSVM) for evaluating wine ages, respectively. All the methods performed well with good prediction results, and LIBSVM presented the best correlation coefficient (R2≥ 0.9998).Keywords:e-tongue;e-nose;rice wine;modified electrodes;smartphone
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2019
·
IF 2.155
Jinyi Zhang,Jing Zuo,Yinshan Jiang,Dandan Zhu,Jiupeng Zhang,Cundi Wei
Coal gasification slag is abundant of unburned carbon and inorganic matters such as silica , alumina and calcium oxide. The mesoporous structure of coal gasification slag can be produced by acid leaching of metal ions. Therefore, it is very important to study the acid leaching process of coal gasification slag. At the same time, in order to broaden the application fields of coal gasification slag, the thermal stability of the as-prepared pore structure should meet the requirements of various occasions. Using coal gasification coarse slag (CS) and coal gasification fine slag (FS) as raw materials, this study investigated the kinetic characteristics of mesoporous formation and optimized the acid leaching conditions. The results of BET, BJH, SEM, XPS and chemical tests showed that under the condition of acid-ash ratio (molar ratio) of 1.0, liquid-solid ratio (volume/mass) of 4:1 and acid leaching temperature of 90 °C, the formation of mesoporous structure by acid leaching was a process of first-order kinetic reaction. According to the analysis of XRD , it was found that the thermal stability of both CS and FS had been greatly improved after acid leaching because of the siliceous enrichment.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Fan Hu,Zhanghui Wang,Baoku Zhu,Liping Zhu,Youyi Xu
Energy-efficient and time-saving process for recovery of hazardous dyes from wastewater is highly desired in dyeing industry. In this work, poly( N -vinyl imidazole) (PVI) gel-filled membrane adsorbers were developed for highly efficient recovery of dyes through adsorption filtration. The membrane adsorbers were fabricated via dip-coating of Nylon macroporous membranes in PVI solutions followed by quaternization crosslinking with p-xylylene dichloride (XDC). Physicochemical characterizations indicated that PVI gel was successfully filled and fixed inside the Nylon matrix. In optimized conditions. The treating capacity of membrane adsorbers to typical dye sunset yellow (25 ppm of the feed concentration) reached up to 197 mg/g with the removal ratio >99%. Both the treating capacity and the removal ratio were kept steady even when the permeation flux was as high as 1000 L/m 2 h. The membrane adsorbers developed in this work were able to not only remove anionic dyes from water, but also separate anionic dyes from cationic ones. The zeta potential and adsorption tests showed that the electrostatic interaction between PVI gel and dye molecules was responsible for the high removal efficiencies to anionic dyes. The membrane adsorbers can be regenerated effectively with NaOH solution and demonstrated good stability in both acidic and alkaline conditions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 24
·13333-13343
·
IF 2.936
Zhenbo Wei,Yanan Yang,Luyi Zhu,Weilin Zhang,Jun Wang
In this paper, poly(acid chrome blue K) (PACBK)/AuNP/glassy carbon electrode (GCE), polysulfanilic acid (PABSA)/AuNP/GCE and polyglutamic acid (PGA)/CuNP/GCE were self-fabricated for the identification of rice wines of different brands. The physical and chemical characterization of the modified electrodes were obtained using scanning electron microscopy and cyclic voltammetry, respectively. The rice wine samples were detected by the modified electrodes based on multi-frequency large amplitude pulse voltammetry. Chronoamperometry was applied to record the response values, and the feature data correlating with wine brands were extracted from the original responses using the ‘area method’. Principal component analysis, locality preserving projections and linear discriminant analysis were applied for the classification of different wines, and all three methods presented similarly good results. Extreme learning machine (ELM), the library for support vector machines (LIB-SVM) and the backpropagation neural network (BPNN) were applied for predicting wine brands, and BPNN worked best for prediction based on the testing dataset (R2 = 0.9737 and MSE = 0.2673). The fabricated modified electrodes can therefore be applied to identify rice wines of different brands with pattern recognition methods, and the application also showed potential for the detection aspects of food quality analysis.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhiyun Kong,Bing Zhang,Xiaolei Wang,Zifei Qi,Chan Huang,Haike Li,Huan Zhang,Huicai Wang
To address the permeability-selectivity trade-off of organic solvent nanofiltration (OSN) membranes, a gel composite membrane was fabricated by the complexation of tannic acid (TA) and ferric ions (Fe 3+ ) on the surface of self-supported calcium alginate (CaAlg) gel membrane. The three-dimensional network of the CaAlg substrate serves as a channel for rapid solvent transport, while the dense TA/Fe 3+ metal-phenol network achieves solute rejection. The chemical structure, morphology, pore size, zeta potential and mechanical properties of the CaAlg substrate and the gel composite membrane were characterized. Dye/solvent separation and solvent resistance were investigated. The results indicate that the TA/Fe 3+ separation layer reduces the pore size, increases the negative charge and improves the mechanical properties of the gel membrane. By optimizing the TA/Fe 3+ complexation conditions, the gel composite membrane has an ethanol permeance of 19.5 L m −2 h −1 bar −1 and a congo red (CR) rejection of 99.0 %, and the separation performance is almost unchanged during 60 d of immersion in N, N -dimethlformamide (DMF). In addition, the composite membrane could separate CR from DMF and acetone, as well as cationic and anionic dyes in ethanol. This work provides a simple and environmentally friendly method to prepare an OSN membrane with high solvent permeance and harsh solvent stability, which is promising for solvent purification and recovery.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Haike Li,Zhiyun Kong,Huan Zhang,Xiaolei Wang,Xin Wei,Ruichao Yang,Xueyi Zhang
Organic solvent nanofiltration (OSN) membranes are suitable for separating drugs from solvents, especially heat-sensitive drugs. However, the trade-off effect between permeance and rejection limits the effective utilization of OSN membranes. In this study, a gel OSN membrane with high permeability-selectivity was prepared by bridging sodium alginate (SA) with HKUST-1 and then cross-linking with Ca 2+ ions. The interspersed distribution of HKUST-1 among the flexible polymer chains results in three-dimensional pores of the gel membrane, which enriches the solvent transport channels. Meanwhile, SA is cross-linked by Cu 2+ from HKUST-1 and Ca 2+ , which densifies the pore structure and enhances the solute rejection of the gel membrane. When the concentrations of HKUST-1, SA, and Ca 2+ are 2.5 wt%, the gel membrane (HKUST-1 2.5% -CaSA) has strong hydrophilicity (11.1°), a small pore size (0.59 nm), and a relatively high porosity (56.89 %). The ethanol permeance of the HKUST-1 2.5% -CaSA gel membrane reaches 43.8 L·m −2 ·h −1 ·bar −1 , with a tracycline (TC) rejection as high as 97 %. Moreover, the HKUST-1 2.5% -CaSA gel membrane is capable of achieving high rejection of TC in other organic solvents (acetone, ethyl acetate, and isopropanol). Even after being immersed in non-polar (n-hexane) and polar solvents (N,N-dimethylformamide, isopropanol, ethanol) for a period of 20 days, the separation performance of the gel OSN membrane remains consistent, confirming the excellent solvent resistance and potential in drug separation and solvent recovery.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2012
·Vol. 59
·期 11
·1415-1420
·
IF 0.678
Jinyun Peng,Keliang Nong,Lingping Cen
Acid chrome blue K (ACBK) was electropolymerized on the surface of a glassy carbon electrode (GCE) by cyclic voltammetric sweep in the potential range from –0.2 to 0.9 V. The characteristic of poly-ACBK film was studied by different methods such as electrochemical impedance spectroscopy (EIS) and cyclic voltammetry. This modified electrode showed excellent electrocatalytic response to curcumin with the increase of the electrochemical responses. Under the optimal conditions a good linear voltammetric response could be obtained over the range of 1.0 × 10 −7 -7.0 × 10 −5 M and the detection limit was got as 4.1 × 10 −8 M (S/N = 3). The method was successfully applied for the determination of curcumin in human urinev samples.
✓ 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）