Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 27
·10410-10423
·
IF 0
Yang Yang,Lei Miao,Jiwen Hu,Guojun Liu,Yuanyuan Tu,Shudong Lin,Feng Liu,Fei Li,Yan Wu,Ganwei Zhang,Hailiang Zou
An amphiphilic binary graft copolymer polysulfone-graft-[poly(methyl methacrylate)-random-poly(acrylic acid)], PSf-g-(PMMA-r-PAA), was synthesized via a combination of atom transfer radical polymerization (ATRP) and click chemistry. This copolymer and polysulfone (PSf) were used to prepare porous membranes through the phase inversion method, which involved dissolving the polymers in a common solvent N-methyl pyrrolidone (NMP), casting the solution onto a glass plate to obtain a film, and subsequently immersing this film into a coagulant (a mixture of dimethylformamide and water at a given pH). The surfaces of the membrane and its pore walls were covered by the copolymer, and these surfaces were enriched with PAA domains due to the immiscibility of PAA and PSf and the miscibility of PMMA and PSf. More specifically, while the hydrophobic PMMA component served as an anchor to fix the graft copolymer onto the PSf bulk substrate, the hydrophilic PAA component assembled and became exposed at the surfaces of the membrane and the pore walls. Factors influencing this surface AA concentration or carboxyl group content (CGC) enrichment and the surface and pore morphologies of the membranes include the ratio between the amount of the copolymer and PSf in the mixture, the solvent quality of the coagulant for PSf, and the temperature as well as the pH of the coagulant. These factors have been systematically adjusted to optimize the hydrophilization of the PSf membrane and the resultant membranes have been characterized by water contact angle (WCA) measurements, scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). Optimization of the phase inversion process yielded membranes with nearly complete surface coverage by PAA, even when the graft copolymer represented only 8 wt% of the membrane's composition. The hydrophilized membranes exhibited increased water flux and even pH-responsive water flow without adversely affecting their mechanical properties. In addition, these hydrophilic membranes exhibited long-term stability. Therefore, this novel binary amphiphilic graft copolymer-based approach for membrane modification may be of commercial value.
研究领域:
材料科学
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化学工程
·
膜技术
✓ 已验证
DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chaofeng Huang,Yingshuang Zhang,Hongru Jiang,Chongqing Wang,Hui Wang,Wanyuan Li,Fei Nie,He Lin
Polyester plastics, constituting a substantial segment of the global plastic market, offer considerable potential market for the polyesters recycling. This study proposed an efficient separation technology for waste polyesters through flotation assisted by alkaline-catalyzed alcoholysis modification. The alkaline-catalyzed alcoholysis modification facilitates the selective hydrophilization of waste polyesters, regulating their float-sink behavior in flotation. According to the polyester floatability, the hydrophilicity of the modified polyesters is in order of PA6 > PET ≈ PU > PC > PMMA. Due to the different C–O and C–N bond strength, the modification selectively induced alcoholysis on the polyesters surface, enhancing their hydrophilicity by increasing the number of rough structure and hydrophilic functional groups on surfaces rather than introducing heteroatoms. The sinking products in flotation, including polyamide 6 (PA6), polyethylene terephthalate (PET), and polyurethane (PU), could be separated from the floating products, such as polycarbonate (PC), and polymethyl methacrylate (PMMA). The binary separation was achieved under optimum conditions. The recovery and purity of PA6, PET, and PU could reach 100.0 % and 100.0 %, 100.0 % and 85.7 %, 79.9 % and 83.1 %, respectively. Consequently, the heterogeneous alcoholysis reactivity contributes to the selective hydrophilization of waste polyesters. This study established a hydrophilicity order of modified polyesters, and promoted flotation separation of waste polyesters.
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
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Xiaobin Yang,Lincheng Yuan,Yuanyuan Zhao,Linlin Yan,Yongping Bai,Jun Ma,Songwei Li,Pavel Sorokin,Lu Shao
Advanced energy-water systems demand fabrication of high-performance water purification membranes. Polymeric membranes are typically hydrophobic, not amenable to conventional surface functionalization methods. Mussel adhesive proteins have inspired numerous adhesive polymer coatings via the structure-function simulation. Nonetheless, research about maximizing membrane interface hydrophilization and relevant concept guidance are still far from enough. Here, we put forward a “split-and-adjust” concept and proof it using a simplified catechol/silane biomimetic composite coating system for boosting interface hydrophilization. As a result, the hierarchically nanostructured silicified hydrophilic membranes were fabricated. The hydrophilicity could be tailored via tuning reagent dose recipes. The as-fabricated hydrophilic membrane presented benign fouling resistance in oil-in-water emulsion filtration tests. In addition, the rinsing examination indicates the coating is well stabilized. The as-developed “split-and-adjust” concept for the composite coating system provides promising guidance to broaden and optimize the customized biomimetic interface functionalization toolbox.
研究领域:
材料科学
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环境工程
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jianchao Wang,Chunhui Wang,Zikun Cheng,Chenshuo Wang,Dongbei Yue,Hui Wang,Hongru Jiang,Bo Jiang,Lingyue Zhang
Plastic recycling is a promising technology, as it can both contribute to circular economy goals and reducing plastic pollution; however, it faces significant challenges due to the lack of effective separation methods. Herein, we studied the flotation separation of polycarbonate (PC), a major component of plastic waste, from multi-plastic mixtures after hydrophilization by Fe(VI). First, the effect of Fe(VI) treatment on the surface properties of the plastics was studied. Fe(VI) induced hydrophilization of PC, with a decreased contact angle of about 19°; this was attributed to the introduction of hydrophilic moieties by surface oxidation and hydrolysis reactions. Then, the effect of operating conditions in both hydrophilization and flotation on the flotability of plastics was investigated. In both binary and multi-plastic mixtures, hydrophilization selectively suppressed the flotability of PC from 100% to about 0.0%. Numerical simulation was performed using the population balance model of computational fluid dynamics to determine the gas-liquid flows during flotation. It was found that the flow rate affected flotation of plastics via bubble formation rather than flow fields. Finally, the optimization of hydrophilization was performed using the Box Behnken design of response surface methodology. The results showed that PC was separated from multi-plastic mixtures with recovery and purity of 100.0% under the optimum conditions. These results would greatly facilitate the development of plastic recycling.
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
CHEMICAL ENGINEERING & TECHNOLOGY
·
2020
·Vol. 44
·期 2
·265-272
·
IF 1.543
Yue Feng,Ning Guo,Shaojie Ren,Xuan Xie,Juan Xu,Yunkun Wang
Membrane fouling is a major hindrance to the effective application of polyethersulfone (PES) membranes. Synthetic silver nanoparticles @ zeolitic imidazolate framework-8 (AgNPs@ZIF-8) hybrid crystals were used to modify the PES microfiltration membranes for mitigating membrane fouling and better water permeability. The surface modification of AgNPs@ZIF-8 hybrid crystals improved the antifouling property of the membranes. The number of live bacteria in the bacteria suspension was over 90 % less than that of control membranes. Furthermore, after surface modification, the membrane permeability was enhanced, which was due to increased surface hydrophilization of the membranes which could partly explain the improved antifouling property. The results demonstrate that the use of AgNPs@ZIF-8 hybrid crystals is a feasible and attractive approach for the development of antifouling membranes.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2022
·
IF 5.999
Zidan Luo,Mengfei Tian,Naveed Ahmad,Wu Qiu,Yu Zhang,Chunying Li,Chunjian Zhao
In this study, a switchable temperature-responsive ionic liquid-based surfactant-free microemulsion (TRIL-SFME) for extraction and in-situ separation of hydrophilic and lipophilic compounds from Camptotheca acuminata was firstly developed and systematically characterized. This TRIL-SFME was obtained using 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM][BF 4 ]), 1,2-propanediol and H 2 O. The prepared TRIL-SFME presented low viscosity and rapid response to temperature. Firstly, the effect of temperatures on TRIL-SFME phase behavior was studied followed by determination of effect of liquid/solid ratio and extraction time on the extraction yields of the targeted compounds. The TRIL-SFME demulsified rapidly by thermal stimulus, resulting in in-situ separation and enrichment of compounds with varying polarity. The results of present study revealed that TRIL-SFME had higher extraction yields (1.50–5.79 folds) compared to traditional solvents and individual components of TRIL-SFME. Besides, in-situ separation and enrichment of hydrophilic compounds (phenolic acids) and lipophilic compounds (alkaloids) was accomplished in short time (within 3 min) by cooling the system to 4 ℃. Furthermore, the mesoscopic behavior between TRIL-SFME and targeted compounds was simulated by dissipative particle dynamics (DPD) to explore the extraction mechanism for the first time. The results illustrated the formation of W/IL structure of TRIL-SFME and clarified solubilization mechanism of TRIL-SFME system for targeted compounds, which is related to its special "water pool" structure. This novel and switchable TRIL-SFME is an environmentally friendly and promising alternative to simultaneously extract, in-situ separate and enrich the natural active compounds with different polarity from plant matrices.
研究领域:
植物化学
·
分离科学
·
药物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Wan-Long Li,Ping Fu,Cheng-Ye Zhu,Di Zhou,Xiao-Jun Huang,Zhi-Kang Xu,Ling-Shu Wan
Nanofiltration membranes have been widely used in many fields owing to their high separation efficiency and low energy assumption. However, traditional substrates for thin-film composite (TFC) nanofiltration membranes, such as polysulfone or polyethersulfone ultrafiltration membranes, suffer from low surface porosity and poor stability in organic solvents. A microporous polypropylene membrane (MPPM) possesses high organic solvent resistance, high porosity, but poor hydrophilicity. Herein, MPPMs were surface hydrophilized for the preparation of TFC membranes by interfacial polymerization. A green, fast, and stable deposition system based on ferulic acid and Fe3+ was employed for surface hydrophilization of MPPM, and thus, the aqueous solution of piperazine can homogeneously distribute on the substrate surface, which was directly visualized by confocal laser scanning microscopy. The nanofiltration membranes show rejection of 98.1% to Na2SO4 and water permeation flux of about 16 L/m2·h·bar. Moreover, the membranes are stable in a variety of common organic solvents, demonstrating the potential in organic solvent nanofiltration. The proposed strategy expands the selection of porous substrates for interfacial polymerization and harsh application environments for nanofiltration.
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
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-10
·
IF 5.228
Hu H. W.,Tang G. H.,Niu D.
Recovery of both latent heat and condensate from boiler flue gas is significant for improving boiler efficiency and water conservation. The condensation experiments are carried out to investigate the simultaneous heat and mass transfer across the nanoporous ceramic membranes (NPCMs) which are treated to be hydrophilic and hydrophobic surfaces using the semicontinuous supercritical reactions. The effects of typical parameters including coolant flow rate, vapor/nitrogen gas mixture temperature, water vapor volume fraction and transmembrane pressure on heat and mass transfer performance are studied. The experimental results show that the hydrophilic NPCM exhibits higher performances of condensation heat transfer and condensate recovery. However, the hydrophobic modification results in remarkable degradation of heat and condensate recovery from the mixture. Molecular dynamics simulations are conducted to establish a hydrophilic/hydrophobic nanopore/water liquid system, and the infiltration characteristics of the single hydrophilic/hydrophobic nanopore is revealed.
研究领域:
热能工程
·
膜科学与技术
·
化学工程
·
能源高效利用
·
环境工程
·
材料科学
·
传热传质学
✓ 已验证
DOI
高影响因子
ANALYTICAL BIOCHEMISTRY
·
2017
·
IF 2.334
Yuan-Yuan Xue,Wen-Tao Zhang,Meng-Yue Zhang,Li-Zhi Liu,Wen-Xin Zhu,Ling-Zhi Yan,Jing Wang,Yan-Ru Wang,Jian-Long Wang,Dao-Hong Zhang
Microfluidic paper-based analytical devices (μPADs) have a significant potential in developing portable and disposable point-of-care testing (POCT). Herein, a facile, rapid, cost-effective and environment friendly strategy for μPADs fabrication is proposed. Specifically, the substrate paper was hydrophobized by coating with trimethoxysilane (TOS), and then the selected area was hydrophilized by treating with surfactant. The whole fabrication process was implemented within 7 min, with no need for complex pre-treatment, high-temperature and special equipment. As a proof-of-concept application, the as-prepared μPAD was applied to determination of the glucose content in human serum samples. The results agreed well with those obtained by a glucometer. We believe that the μPADs fabrication method proposed here could provide a facile, rapid and low-cost reference for other related studies.
研究领域:
分析化学
·
生物医学工程
·
即时诊断
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Kefei Zhao,Guangchun Xu,Leng Wang,Tianyue Wu,Xingyu Zhang,Chenhui Zhang,Yuhang Zhao,Zilu Li,Yuxia Gao,Fengpei Du
Various strategies have been developed to improve the applicability of hydrophobic pesticides for better effectiveness in agriculture. However, existing formulations of hydrophobic pesticides still suffer from complicated processing, abused organic solvents, indispensable surfactants, or inescapable ecotoxicity, which strictly limit their applications. Herein, a dynamic covalent bond tailored pesticide (fipronil) amphiphile is constructed to address the above issues, which accomplishes the nanodispersion, full wetting, and precise delivery without organic solvents, surfactants, and materials simultaneously. By introducing a hydrophilic ligand on the hydrophobic fipronil through an imine bond, the cleavable fipronil amphiphile (FPP) exhibits superior water solubility and can even self-assemble into micelles at higher concentrations, which can be directly applied in powder form without organic solvents. Attributed to the suitable hydrophilic/hydrophobic ratio, FPP achieves full wetting and effective deposition on superhydrophobic rice leaves without surfactants. Moreover, benefiting from the unique dynamic nature of the imine bond, FPP maintains good storage stability while sensitively releasing back to fipronil under the humidity and pH trigger, consequently implementing the precise delivery for nontarget Apis cerana and target Chilo suppressalis without materials. To our knowledge, this dynamic covalent bond tailored amphiphile strategy is the first idea that simultaneously takes the dispersibility, wettability, and responsiveness of hydrophobic pesticides into account, providing a possibility to control the entire journey of field application and even promising to be incorporated into the synthesis process, thus paving the way for modern sustainable agriculture.
研究领域:
农业科学
·
材料科学
·
化学
·
环境科学
✓ 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）