JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Lijuan Yang,Xiaoyin Cao,Jie Cui,Yunjia Wang,Zhaoqi Zhu,Hanxue Sun,Weidong Liang,Jiyan Li,An Li
The accumulation of non-degradable microplastics (MPs) originated from the mass production and huge consumption of plastics of modern industry in the water environment has resulted in severe pollution problems globally. Herein, we report for the first time the preparation of holey Ti 3 C 2 Tx (h-Ti 3 C 2 Tx) membranes obtained by etching Co 3 O 4 nanoparticles embedded on Ti 3 C 2 Tx nanosheets followed by simple vacuum filtration using polymeric membranes as supporting matrix for efficient removal of MPs from wastewater. The h-Ti 3 C 2 Tx nanosheets exhibit a planar porous structure which present nano-holes with an average hole-size of 25 nm in diameter, which facilitated the construction of membranes with better water flux for the separation of MPs. Using fluorescent PS (FP) microspheres of different diameters as microplastic models, the obtained h-Ti 3 C 2 Tx membranes exhibited extremely high MPs removal performance (up to 99.3% under our conditions). Moreover, a large water flux of 196.7 L h −1 m −2 k Pa −1 can be obtained, which can compete or be larger than that of most of the membranes composed of untreated two-dimension nanomaterials. Due to the physicochemical stability, tremendous large water reflux, and the high MPs removal efficiency of h-Ti 3 C 2 Tx membranes, there may be a great potential for practical applications in the separation and removal of various contaminants such as MPs or suspended solids from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Manquan Fang,Haotian Zhang,Jinxun Chen,Tao Wang,Jie Liu,Xiang Li,Jiding Li,Xingzhong Cao
Bio-inspired polydopamine has been established as a facile and versatile surface modification agent in recent years, many applications have been found such as tailoring the wettability of membrane surfaces, constructing antifouling or antimicrobial surface and serving as a platform for further modifications. To our knowledge, these applications were almost all aimed at liquid systems. For gas separations, however, polydopamine (PDA) was rarely investigated and exploited in literature. In this work, we report a facile method to fabricate ultrathin reverse-selective gas separation membranes (bigger molecules permeate more) via self-polymerization and adhesion of polydopamine onto a thin PDMS interlayer (spin-coated on a porous substrate). The as-prepared hierarchical structured membranes (PDA@PDMS) were used to selectively collect hydrocarbons from nitrogen (propylene/nitrogen as a model gas pair) with considerably enhanced separation selectivity and high gas permeance. Evidence supported that in two ways polydopamine skin layer favorably promoted the overall separation performance. Firstly, polydopamine exhibits much better affinity with propylene than that with nitrogen as indicated by gas sorption test. Secondly, owing to the excellent adhesion property and the dense structure of polydopamine, the in-situ polymerized polydopamine contributes to reducing the overall membrane thickness as well as minimizing the possible microstructural defects. Furthermore, polydopamine provides abundant functional groups for further design of membrane surface chemistry, which we believe would have good potential in other possible gas applications ( e.g., carbon capture, olefin/paraffin).
研究领域:
材料科学
·
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
Ying Wang,Yuqing Zhang,Jiaqi Wang
To enhance the cleaning efficiency of the ultrafiltration membrane for wastewater, nano spinel CoFe 2 O 4 was synthesized on diatomite via hydrothermal reaction strategy to prepare nano spinel CoFe 2 O 4 deposited diatomite (CF/Dt) particles for activating peroxymonosulfate (PMS), and then used as a functional layer to form CF/Dtcatalytic separation membrane (CF/Dt-M) to remove small and medium molecular pollutants by precise separation and catalytical oxidation . CF/Dt particles and CF/Dt-M were characterized by SEM. The CF/Dt-M was used to deeply clean simulated wastewater containing oil and rhodamine B for investigating its separation and catalytic oxidation performances. The results show that nano spinel CoFe 2 O 4 particles with diameter of 20–100 nm are deposited on the surface of diatomite, and the thickness of CF/Dt-M functional layer is 44 μm. After cleaning simulated wastewater using CF/Dt-M, concentration of oil, RhB and COD in permeate reduces from 57 mg L −1 , 20 mg L −1 , 231 mg·L −1 to 8 mg·L −1 , 0 mg L −1 and 47 mg L −1 , respectively. Water yield of CF/Dt-M is 658 L m −2 h −1 under 0.06 MPa. Nano spinel CoFe 2 O 4 in CF/Dt-M can efficiently activate a small amount of PMS to release a lot of SO 4 •- , making CF/Dt-M perform properties of precise separation and catalytic oxidation. Therefore, CF/Dt-M is a promising candidate extensively applied for cleaning wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ao Tang,Zhuo Chen,Huijie Nie,Jie Dong,Xin Zhao,Xiuting Li,Qingsong Xu,Qinghua Zhang
A series of highly selective polyimide gas separation membranes were successfully synthesized by reacting the newly synthesized dianhydride monomers containing the amide unit and benzyl group with a commercial diamine, 1,3,5-trimethyl-2,4-phenylenediamine (DAM). The combination of the intermolecular hydrogen-bonding interaction from the amide-imide backbone and the thermo-oxidative cross-linking network induced by the benzyl units endows the membrane with a strong size-sieving capability with an ideal CO 2 /CH 4 selectivity > 125 (over six times higher than that of the commercial Matrimid 5218) with a moderate CO 2 permeability, ranking the top among that of the polyimide gas separation membranes reported so far. The comprehensive separation performance for the CO 2 /CH 4 gas pair surpasses the state-of-the-art 2008 upper bound. Moreover, the prepared membrane showed an increased stability toward high CO 2 pressure of 12 bar, demonstrating an excellent plasticization resistance due to the tightened molecular packing and confined molecular chain motion as well as the rigid nature of the polymer backbone, which also enabled high glass transition temperatures (>400 °C) and fine mechanical properties (tensile strength > 52 MPa) as well as an anti-aging property of the prepared membranes. This study provides a reliable route for constructing polymer membranes with an accurate gas molecular sieving ability and high durability.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 142
·期 2
·e56356
·
IF 2.7
Rongying Xia,Zhixiu Yang,Dayu Sun,Ziqi Wang,Mingzhu Yao,Huijun Liu,Lei Yang,Guanghui Ma,Lijing Gao,Ruiping Wei,Guomin Xiao,Xiaomei Pan
Achieving satisfactory separation of N, N-Dimethylformamide (DMF)/water is still challenging in industrial wastewater treatment. To address this issue, a novel method involving pervaporation (PV) separation using polyvinyl alcohol/chitosan (PVA/CS) blend films is proposed. Various characterization methods confirmed the strong compatibility between PVA and CS, and the blending improved their mechanical properties and thermal stability. Heat treatment significantly reduced the swelling degree of the membranes. In a binary aqueous system with low concentrations of DMF, controlled separation can be achieved by adjusting the blending ratio of PVA to CS. The membranes exhibited preferential selectivity for DMF when the CS content is 40–75 wt%, which allowed for the concentration and recovery of DMF. At 20 °C with a feed of 10 wt% DMF solution, 2 h heat-treated PVA/CS-50 membrane exhibited the best performance, which could be attributed to its strong hydrogen bonding force, with a total flux of 484.09 g m −2 h −1 and a separation factor of 5.41 for DMF. The PVA/CS blend membranes exhibit excellent acid and alkali resistant and are promising candidates for the separation and recovery of DMF from industrial wastewater by membrane technology.
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
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Mingrui He,Ziyue Wang,Yahong Zhang,Panpan Wang,Xu He,Jun Ma
Due to the problem of membrane fouling , the preparation of oil/water separation membranes with stable ultra-high flux is still a challenge. At present, ultra-hydrophilicity is the main antifouling strategy, which indeed renders ultra-high base flux and high flux recovery rate. However, the flux usually declines to a low level during the real oil/water separation. With the assist of low surface energy (LSE) strategy, the flux stability can be remarkably enhanced, but at the cost of the reduced base flux. In order to combine the advantages of hydrophilic and LSE strategies, and avoid the undesired side effects of the LSE strategy, the distribution of hydrophilic and LSE microdomains on membrane surfaces is rationally designed and accurately manipulated in this study. Membranes are prepared by the vacuum-assisted self-assembly of heterogeneous carbon nanotubes (HCNTs), which consist of fluorinated multi-walled carbon nanotubes (FMCNTs), amino multi-walled carbon nanotubes (AMCNTs) and carboxylic single-walled carbon nanotubes (CSCNTs). AMCNTs and CSCNTs form great-area continuous and high porous hydrophilic microdomains through membranes, providing high base flux. FMCNTs form discrete linear LSE microdomains, providing good flux stability via LSE antifouling strategy. Except for the ultra-hydrophilic strategy, this study provides a reasonably and accurately manipulated LSE strategy in the energy-efficient membrane water treatment.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 3
·416
·
IF 4.7
Tong Ji,Yuan Ji,Xiangli Meng,Qi Wang
Temperature-responsive separation membranes can significantly change their permeability and separation properties in response to changes in their surrounding temperature, improving efficiency and reducing membrane costs. This study focuses on the modification of polyvinylidene fluoride (PVDF) membranes with amphiphilic temperature-responsive copolymer and inorganic nanoparticles. We prepared an amphiphilic temperature-responsive copolymer in which the hydrophilic poly(N-isopropyl acrylamide) (PNIPAAm) was side-linked to a hydrophobic polyvinylidene fluoride (PVDF) skeleton. Subsequently, PVDF-g-PNIPAAm polymer and graphene oxide (GO) were blended with PVDF to prepare temperature-responsive separation membranes. The results showed that temperature-responsive polymers with different NIPAAm grafting ratios were successfully prepared by adjusting the material ratio of NIPAAm to PVDF. PVDF-g-PNIPAAm was blended with PVDF with different grafting ratios to obtain separate membranes with different temperature responses. GO and PVDF-g-PNIPAAm formed a relatively stable hydrogen bond network, which improved the internal structure and antifouling performance of the membrane without affecting the temperature response, thus extending the service life of the membrane.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Lijuan Yang,Xingyun Ye,Xiaoyin Cao,Zhaoqi Zhu,Hanxue Sun,Weidong Liang,An Li
The serious environmental issue caused by the rising levels of microplastics (MPs) pollution has aroused much more attention globally, therefore, an effective strategy needs to be established to eliminate MPs from the water. Herein, we first report the preparation of membranes based on holey reduced graphene oxide (h-rGO) nanosheets for efficient removal of MPs in wastewater. Compared with those untreated rGO, the h-rGO nanosheets show a porous structure with an average size of 27.3 nm, which is a benefit for construction membrane for separation of MPs with better water flux (37.19 L m −2 h −1 kPa −1 ). Employing the fluorescent polystyrene (FP) microspheres and PS beads as model MPs, the as-resulted h-rGO membranes exhibit extremely high MPs removal efficiency of 99.9%. In the case of treatment of the industrial MPs containing wastewater, almost all MPs could be captured by the h-rGO membranes which were confirmed by stereomicroscope. Taking advantage of their physicochemical stability and exceptional MPs removal efficiency, the h-rGO membranes may have great potentials for the removal of MPs in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Sisi Ma,Ligang Lin,Qi Wang,Yuhui Zhang,Honglei Zhang,Yixin Gao,Lin Xu,Fusheng Pan,Yuzhong Zhang
A three-dimensional (3D) strategy for the fabrication of ethylene vinyl alcohol (EVAL) membranes with a dynamic surface was developed based on sliding supramolecular polymer brushes (SSPBs). The SSPBs with a 3D hydrophilic structure were introduced into the alkyne–EVAL membrane matrix via an azide–alkyne click coupling reaction. The self-mobile hydrophilic slide-rings in the SSPB provided a proactive exclusion system. This resulted in reduced direct contact of the membrane surface with multiple pollutants such as bovine serum albumin (BSA) and oil droplets. The EVAL-SSPB membrane demonstrated increased surface hydrophilicity, underwater oleophobicity, and antifouling properties. More importantly, the abundant hydrophilic rings in the membrane matrix result in supramolecular assembly and efficient hydrophilic sliding channels. This resulted in a dramatic increase in the water flux [2000 L/(m2 h)] while retaining a 96% rejection of BSA and oil/water emulsions. The results of the study indicate that three effects of the cyclodextrins rings, i.e., the hydrophilic effect, the exclusion effect, and the sliding effect, enabled the improved membrane performance. The demonstrated 3D fabrication strategy is versatile, facile, and scalable, which allows for its application to various other membranes. The fabricated materials possess excellent permeability and separation efficiencies, which make them attractive candidates for use as separation membranes with novel functions.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Yue Feng,Xun Liu,Jingyi Wang,Xinyu Zou,Dianlin Wang,Lei Xie
Nanostructures have been commonly incorporated into oil-water separation membranes to improve their antifouling properties. However, the antifouling mechanism of the membrane with different nanostructures is still unclear. In this work, ZnO nanostructures, i.e., nanorods, hollow nanorods and randomly assemble nanosheets, were constructed on polyvinylidene fluoride (PVDF) membrane surfaces. The resulted membranes exhibited improved antifouling properties in comparison with the pristine PVDF membrane, and the hollow nanorods showed the best antifouling property. The antifouling mechanism was investigated through direct force measurements between oil drops and membrane surfaces using atomic force microscopy. The theoretical analysis of approach force curves indicated that the repulsive electrical double layer force was enhanced at higher pH and in the presence of ZnO nanostructures, which prevented the oil attachment on the membrane surface. The retraction force curves suggested that the adhesion between oil and membrane was significantly affected by the ZnO nanostructures, and the adhesion followed the trend of hollow nanorods < randomly assemble nanosheets < nanorods. Consequently, the oil drops on the membrane with hollow nanorods could be easily removed by water rinsing, which agreed with the flux recovery results. This work provided a fundamental understanding of the antifouling mechanism of the oil-water separation membranes with nanostructures, and a useful guidance for constructing suitable surface structures for efficient oil-water separation membranes.
研究领域:
材料科学
·
环境工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Chao Yu,Jian Lu,Zhiqiang Hou,Zhongfei Ma,Xinyu Lin,Zeqing Dong,Wendong Xing,Yongsheng Yan,Yilin Wu
Exposure and distribution of recognition sites are critical for membrane separation materials to enhance adsorption and separation efficiency toward rubidium ion. Herein, we prepared the rubidium (Rb) ion separation membranes (Rb-ISMs) through a delayed phase inversion method taking advantage of the different polarities between ethanol and water. Fabrication process was conducted through immersion of a poly (vinylidene fluoride)/graphene oxide (PVDF/GO) casting solution into coagulating bath containing 18-crown-6 (18C6) grafted mesoporous silica, ethanol and water. After phase inversion process, the as-prepared adsorbent materials were immobilized on membrane surface by strong electrostatic interaction force. The method could effectively avoid the embedding and aggregation recognition sites, and the coagulating bath only required the ethanol and water that was relatively healthy and environmental. The Rb-ISMs prepared at optimal conditions showed enhanced rebinding capacity (49.344 mg g −1 ) towards Rb ± , with a superior rebinding selectivity (11.8, 6.82, 9.08 for Rb ± /Ca 2+ , Rb ± /Cs ± , Rb ± /Mg 2+ , respectively). Importantly, Rb-ISMs showed remarkable perm-selectivity and regeneration performance, which further demonstrated its potentials in the rapid and effective separation field of Rb ions.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ting Wang,Hongyu Wu,Song Zhao,Wen Zhang,Muhammad Tahir,Zhi Wang,Jixiao Wang
Covalent organic frameworks (COFs) with crystalline imide structure achieved remarkable application in the field of water treatment membrane. In this work, 1,3,5-triformylphloroglucinol (Tp) and benzidine (Bd) or melamine (Me) monomers as the assemble units were firstly in-situ interfacial polymerized upon polysulfone (PSf) porous substrate to form COFs composite membrane with a thin and stable COFs selective layer. Furthermore, adding melamine monomer during interfacial polymerization between Tp and Bd monomers could further introduce a triazine ring type-keto-enol tautomeric type into COFs selective layer, and adjust the molecular network structure and crystallinity of the COFs layer with variable pore aperture. The results indicated that the as-prepared TpBd/PSf and TpBdMe/PSf membranes could be efficiently applied for dye separation process with congo red rejection above 99.0%. Compared with TpBd/PSf membrane, water permeability of TpBdMe/PSf membrane increased from 33.6 L·m −2 ·h −1 ·bar −1 to 62.2 L·m −2 ·h −1 ·bar −1 . Moreover, both TpBd/PSf and TpBdMe/PSf membranes exhibited excellent anti-fouling property, chemical and thermal stability. This work develops a facile method to prepare the imine-linked COFs membrane with variable pore aperture by changing reaction parameters and selecting appropriate amine monomers.
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
危险品化学品经营许可证（带存储）