JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2014
·
IF 0.705
Yiwei Li,Raymond Seekell,Sihui Zhan,Jie Cao,Jing Jing,Yi Li
In this article, positively charged GVs were electroformed in a binary system of quaternary ammonium salts and egg phosphatidylcholine (EggPC) under an alternative current (AC) electric field. The diameter and charge density of the GVs is controlled by doping suitable cationic quaternary ammonium molecules into the EggPC bilayer. By developing positively charged GVs, there will be expanded the applications for phospholipids vesicles, especially the investigation of charge-induced interactions between cationic lipid membranes and macromolecules, such as colloidal particles or proteins.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Shuqing Cao,Jingjing Wang,Qin Cheng,Yi Wu,Jia Xu,Ming Xia,Ke Liu,Shanshan He,Dong Wang
With the development of new energy powered vehicles, the shortage of lithium resources has become more urgent. The recovery and extraction of lithium resources from waste lithium iron phosphate batteries can achieve the sustainable development of the new energy industry, alleviate the imbalance between the supply of and demand for lithium resources, and greatly reduce the environmental pressure brought by the future battery retirement tide. In this work, a poly(ethylene vinyl alcohol) nanofiber was employed to construct a positive interlayer via co-crosslinking with PEI and sprayed on a PES substrate, on which a positive polyamide nanofiltration layer was formed via interfacial polymerization with 1,3,5-benzenetricarbonyl chloride. The abundant interconnected pores of nanofibers provided high water flux. Meanwhile, the dual positively charged layer had a synergistic effect on cation rejection. The nanofiber interlayer greatly improved the roughness and effectively enhanced the hydrophilicity of the membrane surface. The optimized nanofiltration membrane exhibited a pure water flux of 36.73 L m−2 h−1, a high Fe3+ rejection of 99.36%, and a Li+/Fe3+ separation factor of up to 115. Its excellent separation performance was maintained under acidic conditions, revealing its great potential in recycling lithium from waste batteries.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Zhiming Mi,Zhixiao Liu,Sizhuo Jin,Dawei Zhang,Daming Wang
Novel positively charged nanofiltration membranes were facilely prepared by polydopamine (PDA) deposition followed by crosslinking on the polyethersulfone (PES) ultrafiltration (UF) membrane substrate. Specifically, small molecules DMAPA and 1,3-dibromopropane were separately selected as the bridge agent and crosslinking agent, which can not only realize the moderate crosslinking and densification of the loose structure of the PDA layer, but also further improve the hydrophilicity and positive charges of the PDA layer. Under the optimized conditions of DMAPA concentration (2 g/L), 1,3-dibromopropane concentration (10 wt%) and reaction time (9 h), the composite membrane had the surface pore size as low as 1.1 nm, water contact angle as low as 35.1° and zeta potential as high as +63.8 mV at pH = 6. As a result, the optimized positively charged NF membrane (M3) showed an outstanding permeance up to 15.7 L m −2 h −1 bar −1 while maintaining a high rejection above 95% for MgCl 2 . Meanwhile, M3 also showed good environmental adaptability when facing complex feeding or operating conditions. This work provided new situation in the design and construction of positive charged NF membranes for high efficiency cation separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Li Zhang,Nanxi Di,Zhi Wang,Song Zhao
Nanofiltration (NF) has the potential to achieve the efficient effluent separation. However, conventional polyamide-based NF membranes face several challenging issues, including negatively charged surface, insufficient water permeance and low selectivity of organic micropollutants. Herein, we designed a novel polyamine membrane generated from the nucleophilic substitution reaction between 1,4,7,10-tetraazacyclododecane (Cyclen) and 1,3,5-tris(bromomethyl)benzene (TBB), and proposed its fabrication via oligomer triggered interfacial polymerization (OT-IP). As the crucial component of the polyamine membrane, the amine-linked Cyclen-TBB selective layer was assembled onto a porous substrate through interfacial polymerization between alkaline aqueous solution and organic solution consisting of Cyclen and TBB premixed in n-hexane. The resultant Cyclen-TBB composite membrane possessed an effective pore size of ∼1.6 nm and strongly positively charged surface with a zeta potential of +18.4 mV in a neutral solution. Owing to these characteristics, the Cyclen-TBB composite membrane exhibited a high water permeance of 77.0 L·m −2 ·h −1 ·bar −1 , and high rejections to positively charged dyes and drugs with molecular weights above 500 Da. Moreover, the composite membrane possessed splendid chemical resistance under both acidic or alkaline conditions, and operational stability during continuous filtration. These results demonstrate that novel highly permeable and positively-charged polyamine NF membranes are potential candidates for selective separation of molecules, and provide a feasible alternative for application in the treatment of industrial and pharmaceutical effluents.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 10
·5382-5387
·
IF 2.936
Yong Qin,Fan Li,Peng Tu,Yanling Ma,Wenlong Chen,Fenglei Shi,Qian Xiang,Hao Shan,Lifu Zhang,Peng Tao,Chengyi Song,Wen Shang,Tao Deng,Hong Zhu,Jianbo Wu
We have demonstrated Ag3PO4 as an active non-Pt electrocatalyst with enhanced activity compared with Ag for oxygen reduction reaction (ORR). Density functional theory reveals that better ORR performance of Ag atoms on Ag3PO4 surface than that on pure silver surface originates from more appropriate oxygen adsorption on positively charged Ag atoms. Further study of the surface geometry of Ag3PO4 including tetrahedron, rhombic dodecahedron and cube indicates that the highest density of Ag and appropriate oxygen adsorption on {110} surface of rhombic dodecahedral Ag3PO4 lead to the highest ORR activity, which is about 12 times that of Pt catalysts from a commercial perspective. It may be applicable for developing low-cost and highly active non-Pt catalytic materials from a broader range of material systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yongxiao Tuo,Ying Meng,Chen Chen,Dong Lin,Xiang Feng,Yuan Pan,Ping Li,De Chen,Zhanning Liu,Yan Zhou,Jun Zhang
Platinum group metals hold pronounced potential for the dehydrogenation process of liquid organic hydrogen carriers (LOHCs) such as decalin, but the strong adsorption of dehydrogenation product has suppressed the moving forward of these catalysts. Herein, we described that the strong interactions between Pt and MgAl 2 O 4 trigger partial positively charged Pt, which mitigates the adsorption of naphthalene on highly active Pt sites, thus achieving an outstanding decalin dehydrogenation activity that is nearly twice that of state-of-the-art Pt/CNF catalysts. As revealed by various characterization outcomes and DFT calculations, the strong electronic interactions between Pt and spinel oxygen surface resulted in partial positively charged Pt on MgAl 2 O 4 , which inhibits the electron transfer from Pt to unsaturated carbon of naphthalene, thus weakening the bond strength between Pt and naphthalene. As a result, the combination of small-sized Pt nanoparticles and facile desorption of products endows tremendous dehydrogenation activity of Pt/MgAl 2 O 4 . This study may shed new light on the rational construction of highly efficient metal catalysts for the application of LOHCs.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Qian Nan,Pei Li,Bing Cao
Highly positively charged nanofiltration (NF) membranes have been prepared via a layer-by-layer (LbL) self-assembly technique using graphene oxide (GO) and polyethyleneimine (PEI). The high aspect ratio and unique 2D structure of GO nanosheets enabled them to be easily assembled on the membrane surface, and the intrinsic low resistant channels within the GO nanosheets resulted in a high water flux of the membrane. By assembled a PEI layer on the membrane outer surface, the composite membrane exhibited high positive charge and resulted in the high rejections to multivalent ions. The effects of deposition time, PEI and GO concentrations on separation performance of the NF membranes were detailed studied. The best performance among all the membranes was achieved with salt rejections of 93.9% and 38.1% for Mg 2+ and Na + , and a water flux of 4.2 L/m 2 h bar at 30 °C and 0.5 MPa. The attractive performance of these NF membranes showed a great potential in the industrial application of water softening.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lunqiang Jin,Haifeng Ji,Yusha Gao,Tao Xu,Shengde Xu,Xiang Zhang,Xiaoling Liu,Feng Liang,Weifeng Zhao,Changsheng Zhao
Developing high-efficiency adsorbents by facile approaches for sewage treatment is high demand but challenging, numerous scientists have made great efforts to fabricate such adsorbents by controlling the structures and functional groups. However, simultaneously improving the adsorption amounts and rates for the microcontaminants seems to be incompatible, which has been puzzling researchers for a long time. To face this challenge, herein, we provided a solution from a strategic perspective instead of only developing a material. We conceived that the key to realize this target was achieving instantaneous diffusion of microcontaminants, and then used regenerative carboxylated sponge ( RCS ) to verify our supposition. As a result, just by simply swelling and squeezing, the sponge could instantaneously clean the positively-charged microcontaminants at a high concentration (1000 μmol/L) and high clearance ratios (the ratios for methylene blue, methyl violet, Cu 2+ , Cr 3+ and Co 2+ were 99.2%, 99.1%, 92.1%, 68.4% and 60.2%, respectively), what’s more, only in one second. Additionally, the sponge could also fulfill large-scaled water purification via suction filtration, and a fast flux of up to 45,000 L/m 3 ·h with ultrahigh clearance ratios (as for positively-charged dyes, the clearance ratios were more than 99%; as for heavy metal ions, the clearance ratios were more than 90%) could be achieved. Additionally, with the advantages of the high adsorption capacity and excellent recyclability, the sponge exhibited long-term purification ability, which might be promising for both small and large-scaled sewage treatment. More importantly, we believed that this strategy might not only be applied in the field of sewage treatment, but also be referenced in the field of bacterial eradication and blood purification, etc.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Xiaohui Zhang,Qingqing Gu,Yanfu Ma,Qiaoqiao Guan,Rui Jin,Hengwei Wang,Bing Yang,Junling Lu
For supported metal catalysts, the underlying support not only disperses and stabilizes metal particles, but also modulates their electronic structures remarkably, and even directly participates in catalytic reactions. Here we report that Pd nanoparticles (NPs) supported on oxygen-functionalized carbon black (Pd/O-C) show an unexpected inverse trend of selectivity on Pd particle size in chemoselective hydrogenation of para -chloronitrobenzene ( p -CNB), compared to those on carbon black (Pd/C). In situ X-ray photoemission spectroscopy reveals that the Pd NPs are more positively charged with decrease of particle size in both samples, while the Pd NPs in Pd/O-C have relatively higher fractions of positive Pd δ+ species than those in Pd/C with similar sizes. Fourier transform infrared spectroscopy shows that the balance of positive Pd δ+ species strongly modulates the competitive adsorption of -NO 2 and -Cl group in p -CNB according to their different electronegativities. As a consequence, we, for the first time, demonstrate that a moderate positive charge of Pd NPs is essential to improve the p- chloroaniline ( p -CAN) selectivity, while too high or too low positive charge could impel the adsorption of the less negatively charged -Cl group, thus generating the dehalogenated aniline by-product. These findings suggest that precise tailoring of the electronic structures of metal NPs could be essential for design of high chemoselective metal catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Xiaomin Ren,Yingying Chen,Yu Wang,Hongyan Fu,Dan Hu,Xudong Feng
The positively charged nanofiltration membrane (NF) has a strong repulsive effect on divalent magnesium ions, thus could be applied for the separation of Mg 2+ /Li + . Chemical grafting modification is an effective way to prepare positively charged membranes. However, it is difficult to achieve chemical modification on the surface of polyamide membrane as the chemical stability of polyamide. By introducing hydroxyl rich monomers (3-[n-tris(hydroxymethyl)methylamino]−2-hydroxypropanesulfonic, HMAH) as active sites in the interfacial polymerization process, the olefin monomers containing quaternary ammonium salt functional groups (acryloxyethyl trimethyl ammonium chloride, ATA) were reacted onto the surface of NF membrane through radical polymerization initiated by cerium ions to obtain positively charged NF membrane. The successful grafting reaction of quaternary ammonium salt monomer onto the surface of NF membrane was verified by Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The membrane with dense and smooth surface layer showed C-N + characteristic peak in XPS N1s spectra and high isoelectric point. Meanwhile, the as-prepared membrane achieved high MgCl 2 rejection of 95.74% and low LiCl rejection of 18.1%, with pure water permeance of 9.43 L·m −2 ·h −1 ·bar −1 . After 60 hours of mixture filtration experiment, the membrane exhibited good long-term stability, maintaining the ionic separation selectivity over 30, which indicated that the positively charged membrane prepared by grafting method has potential application in the separation of Mg 2+ /Li + .
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yawei Qi,Lifang Zhu,Xin Shen,Arcadio Sotto,Congjie Gao,Jiangnan Shen
The performance of nanofiltraton (NF) membranes are characterized by a high selectivity for multivalent anions, whereas poor selective separation capacity for multivalent cations and heavy metal ions. In this work, a new positively charged NF membrane was prepared by using 2-chloro-1-methyliodopyridine as an active agent to graft polyimide polymer onto the membrane surface via covalent bonding with surface carboxylic groups. The results showed that the prepared membranes had a high selective separation for divalent and monovalent salts (MgCl 2 97.1%, CaCl 2 96.8%, Na 2 SO 4 83.5%, MgSO 4 87.3%, NaCl 49%, LiCl 32%), and also exhibited a high removal efficiency for toxic heavy metal ions and dyes (CuCl 2 96%, NiCl 2 95.8%, CrCl 3 98.0%, Tropaeolin O 98.3%, Victoria blue B 99.2%, Semixylenol orange 99%, Neutral 98.2%).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2016
·
IF 5.583
Jingyi Gao,Mingzhi Wang,Fangyingkai Wang,Jianzhong Du
Antimicrobial resistance is an increasingly problematic issue in the world and there is a present and urgent need to develop new antimicrobial therapies without drug resistance. Antibacterial polymers are less susceptible to drug resistance but they are prone to inducing serious side effects due to high positive charge. Herein we report a peptide-grafted hyperbranched polymer which can self-assemble into unusual nanosheets with highly effective intrinsically antibacterial activity but weak positive charges (+ 6.1 mV). The hyperbranched polymer was synthesized by sequential Michael addition-based thiol–ene and free radical mediated thiol–ene reactions, and followed by ring-opening polymerization of N-carboxyanhydrides (NCAs). The nanosheet structure was confirmed by transmission electron microscopy (TEM) and atomic force microscopy (AFM) studies. Furthermore, a novel “wrapping and penetrating” antibacterial mechanism of the nanosheets was revealed by TEM and it is the key to significantly decrease the positive charges but have a very low minimum inhibitory concentration (MIC) of 16 μg mL–1 against typical Gram-positive and Gram-negative bacteria. Overall, our synthetic strategy demonstrates a new insight for synthesizing antibacterial nanomaterials with weak positive charges. Moreover, the unique antibacterial mechanism of our nanosheets may be extended for designing next-generation antibacterial agents without drug resistance.
研究领域:
材料科学
·
生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）