DESALINATION
·
2024
·
IF 8.3
Kun Wang,Zihao Ge,Mianliang Ji,Jian Li
Block copolymer-based porous materials have found extensive applications across a broad spectrum of industries. Their customized structures and scalable production capabilities have provided numerous possibilities to design membranes with precise separation properties. In this study, mPEGx-b-PAN block copolymers have been synthesized by incorporating mPEG of varying molecular weights in order to improve the selectivity and the antifouling properties of the resulting ultrafiltration membranes. Microphase separation within mPEG and PAN blocks was dependent on mPEG chain length and block concentration, ultimately leading to the controlled creation of pores in the mPEGx-b-PAN ultrafiltration membrane. Simultaneously, the surface layer thickness of the composite membrane was considerably reduced after adding the block copolymer. The optimized UF 2000 – 1.0 membrane, prepared by blending 1 % mPEG 2000 -b-PAN with PAN, exhibited a high permeability of 340.75 ± 22.17 L m −2 h −1 bar −1 and a BSA rejection rate of over 99 %, effectively separating organic pollutants such as HA, CR, and CB-G250. Furthermore, antifouling tests showed that the mPEG 2000 -b-PAN/PAN composite membranes exhibited a gradual degradation of permeability during the antifouling stage, with high permeability recovery after backwashing. Therefore, mPEGx-b-PAN block copolymers demonstrate promising potential for membrane separation applications and pave the way for significant advancements in filtration technology.
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
DESALINATION
·
2022
·
IF 11.211
Wenxin Zhang,Yaqi Zhang,Yuze Wang,Shiwei Tian,Na Han,Wei Li,Wei Wang,Hongwei Liu,Xuhuan Yan,Xingxiang Zhang
Membrane fouling remains a significant restriction for the long-time operation. In this paper, fluffy-like amphiphilic graphene oxide (f-GO) was prepared by simple grafting silane coupling agent (KH-570) onto the graphene oxide matrix, and thus featured with good dispersion behavior in organic solution. The f-GO was further incorporated into the PAN-based (poly(acrylonitrile-methyl acrylate), P(AN-MA)) copolymer during the phase inversion process. Compared with the P(AN-MA) membrane, the resistance of the f-GO/P(AN-MA) composite membrane reduced from 4.49 × 10 −12 m −1 to 1.78 × 10 −12 m −1 . The pure water flux increased from 200 to 326 L/m 2 h, while the water contact angle declined from 92.8° to 68.3°. It is worthy to note that the fouling mode changed from irreversible fouling to reversible fouling , with the total fouling rate showing a half decay. The fouling recovery rate reached 98.16% and the BSA rejection rate increased from 70.59% to 99.33% as 0.5 wt% f-GO was incorporated. The f-GO is easily scaled up and can be widely applied in other polymer matrices , showing potential application prospects in the membrane separation and purification area. The f-GO/P(AN-MA) composite membranes with excellent water flux, BSA rejection and FRR, are candidates for further employment in wastewater purification applications.
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
RSC Advances
·
2016
·Vol. 6
·期 33
·27485-27493
·
IF 3.289
Yunze Wang,Haibo Lin,Zhu Xiong,Ziyang Wu,Xuemin Yu,Yi Wang,Fu Liu
An interesting PVDF membrane with unusual thermoresponsive behavior was prepared by the incorporation of P(OEGMA-co-VTMOS). The P(OEGMA-co-VTMOS) copolymer was first in situ synthesized in a PVDF/triethyl phosphate (TEP) casting solution. A P(OEGMA-co-VTMOS) network was assembled in the PVDF membrane through hydrolysis and condensation during phase inversion. PVDF/P(OEGMA-co-VTMOS) in organic solvent demonstrated a typical LCST around 35 °C, reflecting the reversible transition of the coil-to-globule conformation. Microphase separation was responsible for the appearance of turbidity of the casting solution. FTIR, XPS, TGA and SEM confirmed the surface enrichment of the copolymer, especially in the membrane bottom. The hydrophilicity and protein anti adsorption were improved despite the temperature variation. In particular, AFM in aqueous media was conducted to determine the reversible morphology and water channel variation under heating and cooling. Different from common thermoresponsive membranes, the so-modified PVDF membranes exhibit a reversible abnormal change of pure water flux and BSA rejection with temperature. The intriguing thermoresponsive behavior and mechanism of the modified PVDF membrane was thoroughly investigated from the aspects of PVDF/TEP casting solution, membrane morphology in aqueous media and water/BSA filtration performance.
研究领域:
材料科学
·
膜技术
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 30
·期 2
·351-359
·
IF 2.137
Jinying Du,Yu Tian,Ning Li,Jun Zhang,Wei Zuo
In order to improve the antifouling performance of PVDF membrane, a novel zinc sulfide/graphene oxide/polyvinylidene fluoride (ZnS/GO/PVDF) composite membrane was prepared by immersed phase inversion method. The surface morphology, crystal structure, photocatalytic activity, and antifouling property of the as-prepared membranes were systematically studied. Results showed that the ZnS/GO/PVDF hybrid membranes were successfully fabricated with uniform surface. The hybrid membrane surface possessed higher hydrophilicity with water contact angle decreasing from 77.1° to 62.2°. The permeability of the hybrid membrane was therefore enhanced from 222.9 to 326.1 L/(m 2 hour). Moreover, bovine serum albumin (BSA) retention experiment showed that the hybrid membrane separation was also promoted by 7.2%. The blending of ZnS and GO enhanced the hydrophilic and photocatalytic performances of PVDF membrane, which mitigated the membrane fouling effectively. This novel hybrid membrane could accelerate the practical application of photocatalytic technology in membrane separation process.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Zhong-Kun Li,Wan-Zhong Lang,Wei Miao,Xi Yan,Ya-Jun Guo
Graphene oxide (GO), one of the most promising filter materials, is intensively employed to prepare the membranes via non-solvent induced phase separation(NIPS) method, but it has not been found to modify polymeric membranes via thermally induced phase separation (TIPS) method. In this work, the derivative of GO, SiO 2 @GO nanohybrid , is fabricated and employed to synthesize PVDF/SiO 2 @GO nanohybrid membranes via TIPS method for the first time. The results indicate that the PVDF/SiO 2 @GO nanohybrid membranes experience liquid-liquid phase separation mechanism, and exhibit bi-continual and asymmetric structure. The included SiO 2 @GO nanohybrid is uniformly dispersed in the membrane matrix. With the addition of SiO 2 @GO, the top surface becomes denser and the pore size decreases; but overhigh SiO 2 @GO addition for membrane M-5 triggers in the adverse trend. This is caused by the combined actions of nucleation and growth of PVDF and viscosity increase of cast solution due to the addition SiO 2 @GO nanohybrid. The BSA rejection of membrane gradually increases with the addition of PVDF/SiO 2 @GO nanohybrid accompanied with the decline of pure water permeation flux. As the SiO 2 @GO content increases to 0.9 wt%, the PVDF/SiO 2 @GO nanohybrid membrane M-4 presents the highest BSA rejection of 91.7% and the lowest permeation flux of 182.6 L m −2 h −1 bar −1 . However, the overhigh SiO 2 @GO addition (1.2 wt%) leads to the outstanding pure water permeation flux of 679.1 L m −2 h −1 bar −1 and a much lower BSA rejection. The addition of PVDF/SiO 2 @GO nanohybrid evidently improves the surface hydrophilicity and antifouling ability of resultant membranes. The XRD patterns and FTIR spectra of membranes verify the exclusive α-phase of PVDF, and the melting temperature( T m ) and crystallinity( x c ) evidently increase with the addition of SiO 2 @GO nanohybrid up to 0.9 wt% in the dopes. Overhigh SiO 2 @GO addition (1.2 wt%) leads to small decline for these parameters.
研究领域:
材料科学
·
膜技术
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhimeng Sun,Yiyong Yang,Zhongguo Zhang,Yue Shan,Zhifeng Hu,Jindi Yang,Xiaojing Ren
A highly crystalline phase g-C 3 N 4 , namely poly (heptazine imide) (PHI) was synthesized using molten salts. A high-performance ultrafiltration membrane was prepared by blending PHI nanosheets with Poly( m -phenylene isophthalamide) (PMIA) to obtain casting solution, and further prepared by phase conversion method. Hybrid PMIA membranes were prepared by incorporating 0.02–0.10 wt% of PHI, which were further characterized by SEM, AFM, XRD, FTIR, XPS, TGA and surface zeta potential. The hydrophilicity, water flux, and rejection of bovine serum albumin (BSA) of the membrane significantly increased. For instance, the water permeability of M4 (264.6 Lm −2 h −1 bar −1 ) was about 2.3 times that of bare PMIA membrane (113.6 Lm −2 h −1 bar −1 ), while maintaining a BSA rejection of 94.7 % for a 1000 mgL −1 BSA feed solution. Moreover, the M4 membrane showed excellent antifouling performance with a flux recovery rate of up to 88.7 % and lower irreversible fouling of 11.3 %. This study may provide reference for the modulation of highly crystalline g-C 3 N 4 structure and its application in membrane fabrication for water treatment.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 25
·15231-15244
·
IF 3.361
Qi Wang,Fengna Dai,Shangying Zhang,Mengxia Wang,Chunhai Chen,Youhai Yu
Zwitterionic nano-silica (SiO2 NPs) obtained by lysine surface modification was used as a hydrophilic inorganic filler for preparing a poly(aryl ether nitrile) (PEN) nanocomposite membrane via an immersion precipitation phase inversion method. The effects of zwitterionic SiO2 NPs addition on the morphology, separation and antifouling performance of the synthesized membranes were investigated. Zwitterionic surface modification effectively avoided the agglomeration of SiO2 NPs. The PEN/zwitterionic SiO2 NPs composite membranes exhibited improved porosity, equilibrium water content, hydrophilicity and permeability due to the introduction of hydrophilic SiO2 NPs in the casting solution, and the optimal pure water flux was up to 507.2 L m−2 h−1, while the BSA rejection ratio was maintained at 97.4%. A static adsorption capacity of 72.9 μg cm−2 and the FRR up to 85.3% in the dynamic antifouling experiment proved that the introduction of zwitterionic SiO2 NPs inhibited irreversible fouling and enhanced the antifouling ability of the PEN 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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Di Zhou,Guolong Rong,Sa Huang,Jinhui Pang
In order to mitigate the selectivity-permeability trade-off for ultrafiltration membranes, a series of polyphenylene sulfone (PPSU) with flexible negative charged sulfonated side chains (SPPSU-SC) were synthesized applied in ultrafiltration (UF) field. And tests results showed that the ultrafiltration performance was enhanced greatly. In short, the water flux increased to 380 L · m −2 · h −1 at the sulfonation degree of 20%, which was as two and a half times high as PPSU membranes. However, the membrane SPPSU-SC20 still held a relatively high BSA rejection of 91.6%, which should be attributed to the enrichment of negative charged sulfonic groups on the membrane surface. More importantly, the antifouling properties were also promoted. The total fouling ratio (R t ), reversible fouling ratio (R r ), irreversible fouling ratio (R ir ) and flux recovery ratio (FRR) were all improved to some degree. Besides, compared to the main-chain sulfonated PPSU with the sulfonation degree of 20% (SPPSU-MC20) membranes, SPPSU-SC20 had a better separation structure caused by better phase separation during the membrane preparation period at the sane high sulfonation degree. In a word, the results showed that side-chain sulfonated PPSU possessed a potential bright horizon in ultrafiltration field.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Han Feng,Jun Liu,Yongfeng Mu,Nan Lu,Shuling Zhang,Mei Zhang,Jiashuang Luan,Guibin Wang
Metal organic frameworks (MOFs) have raised considerable interest because of their favorable impacts on the performance of water treatment membranes. Herein, the novel nanocomposite based on both nanoporous MOFs and hydrophilic carbon quantum dots (CQDs) was exploited as a novel dopant for the fabrication of PES ultrafiltration (UF) membranes. CQDs were synthesized via pyrolysis of citric acid, and UiO-66-NH 2 @CQDs were synthesized via the condensation reactions of CQDs and UiO-66-NH 2 using EDC and NHS as the condensating agents. The properties of resulting membranes on the porosity, membrane morphology, hydrophilicity, permeability and anti-fouling performance were adequately investigated. The membranes incorporated with UiO-66-NH 2 @CQDs exhibited significantly improved water flux (up to 358.5 Lm −2 h −1 ), which was ~1.82 times that of pristine PES membrane. Additionally, the BSA rejections rates for the hybrid membranes were all maintained above 95.0%. Furthermore, the hybrid membranes exhibited enhanced anti-fouling performance and the highest flux recovery ratio ( FRR ) of the hybrid membrane with 0.5% UiO-66-NH 2 @CQDs reached 77.6%. The membranes incorporated with UiO-66-NH 2 @CQDs exhibited better permeability and anti-fouling performance than those incorporated with CQDs or UiO-66-NH 2 . This work reveals that the novel hydrophilic nanofillers combining CQDs and MOFs exhibit great potential for application in water treatment membranes.
研究领域:
材料科学
·
环境工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Ziyun Yang,Qiaohong Liu,Qianru Zhang,Yue Shen,Yijie Shi,Yushan Sun,Yaqian Li,Yuelian Peng,Quan-Fu An
Incorporating zwitterionic materials into polymer matrix is an effective method to fabricate high-performance ultrafiltration membranes, which can improve the surface hydrophilicity while optimizing the internal structure of the membrane. In this study, a series of zwitterionic copolymers, 4VP-MPC, were synthesized using 4-vinylpyridine (4VP) and 2-methylacryloxyethyl phosphocholine (MPC), and their impact on the phase inversion process of polysulfate (PSE) was investigated thoroughly by changing the addition amount and altering the copolymer composition. The addition of 4VP-MPC accelerated the phase inversion rate, reduced the skin layer thickness and improved the membrane porosity. Moreover, the hydrophilicity of the membrane surface is enhanced due to the segregation of the zwitterionic copolymer during the membrane formation process. A novel PSE/4VP-MPC membrane with good separation performance and antifouling property was fabricated, with a pure water flux of 221 L/(m 2 h bar), a BSA rejection rate of 93.3 %, and a flux recovery rate of 94.6 %. Additionally, when filtering the mixed simulated dialysate, the optimized membrane showed clearance rates of 71.3 % and 97.0 % for lysozyme and urea respectively, while maintaining a high BSA rejection. This PSE/4VP-MPC blend membrane demonstrated potential applications in the field of ultrafiltration, including hemodialysis.
研究领域:
材料科学
·
膜技术
·
化学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Xingyuan Wang,Xiansong Shi,Yong Wang
Covalent organic frameworks (COFs) are increasingly utilized as doping agents for the design of advanced ultrafiltration mixed matrix membranes, thanks to their prominent nanoporosity and excellent polymer compatibility. However, current strategies are largely limited in the complicated postaddition of neutral COF particulates. Herein, cationic COFs, namely, TpEB, with sizes down to ∼39 nm are in situ synthesized in polyacrylonitrile (PAN) solution as crystalline fillers for the production of highly permeable TpEB–PAN ultrafiltration membranes. After the condensation of monomer pairs, the growth of cationic TpEB crystallites is restrained due to the electrostatic interaction with negatively charged PAN chains, leading to the formation of a homogeneous TpEB-incorporated casting solution. During the subsequent nonsolvent-induced phase separation process, TpEB crystallites facilitate exchange between the solvent and the nonsolvent because of their hydrophilic and nanoporous nature, accelerating the rate of phase inversion to form a highly porous membrane surface. Thus-prepared TpEB–PAN membranes deliver a tight rejection of BSA with water permeance of up to 380 L m–2 h–1 bar–1, which is 35.6% higher than that of the original PAN membranes prepared without TpEB. The TpEB–PAN membranes also exhibit enhanced operation stabilities and fouling resistances. This in situ growth strategy suggests a new avenue for the preparation of advanced mixed matrix membranes.
研究领域:
材料科学
·
化学工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2016
·Vol. 17
·期 11
·1820-1828
·
IF 1.022
Yang Xue,Liu Hui,Zhao Yanjiao,Liu Lifang
Cellulose nanocrystals (CNCs) extracted from corn husks were used as additive to modify the hydrophilicity and anti-fouling properties of polysulfone (PSf) membrane. The PSf/CNCs blend membranes were prepared via an immersion phase inversion method. The influence of CNCs content on the morphology, structure, and performances of PSf membrane were carefully investigated by SEM, TG, DTG, DSC, break strength, elongation-at-break, Young modulus, contact angle and filtration experiment. The results showed that the isolated CNCs from corn husks were a promising additive for modifying the properties of PSf membrane. CNCs can improve mechanical property, thermal stability, hydrophilicity and anti-fouling performance of the pure PSf membrane. The PSf/CNCs blend membrane reached optimal properties at 2 wt% CNCs content, which was 2.76 and 1.57 times in pure water flux and FRR values respectively as compared to pure PSf membrane. Meanwhile, PSf-2 also can maintain a relatively high BSA rejection.
研究领域:
材料科学
·
纳米技术
·
膜技术
·
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）