APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xueting Zhao,Youyou Lan,Kai Yang,Ruoxi Wang,Lijuan Cheng,Congjie Gao
This study proposes a novel strategy to fabricate antifouling UF membrane with integrated zwitterionic and TiO 2 functionality via in situ mixed-charge copolymerization and TiO 2 mineralization. The mixing of positively and negatively charged monomers at the molecular level endows membrane surface with balanced mixed-charge zwitterionic functionality, and the in situ TiO 2 mineralization endows membrane surface with well-dispersed TiO 2 nanoparticles. Thanks to the unique hydrophilicity of mixed-charges and TiO 2 , the obtained PVDF/P(MAA-TA)-TiO 2 membrane shows greatly enhanced surface hydrophilicity. The outstanding hydrophilicity of the PVDF/P(MAA-TA)-TiO 2 membrane significantly improves permeability and protein rejection compared to that of the unmodified PVDF membrane. What's more, the PVDF/P(MAA-TA)-TiO 2 membrane exhibits excellent antifouling capability against protein with flux recovery rate and fouling removal efficiency about 100%. Results of detailed fouling analysis indicate that both surface fouling and pore fouling were limited on the PVDF/P(MAA-TA)-TiO 2 membrane. The antifouling performance is mainly attributed to the synergistic hydrophilicity of mixed-charges and TiO 2 , and meanwhile the decrease in the surface electronegativity and pore size also plays a role. Results of this study provide a facile and scalable method for designing antifouling UF membrane, and highlight the promising potential of mixed-charges and TiO 2 synergy for manipulating hydrophilic and antifouling modification of UF membranes.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Lei Wu,Menghan Liu,Yuting Chen,Ming Li,Tingting Yin,Cong Ma,Wei Fan
UF is widely used as a wastewater treatment and recycling technology. However, membrane fouling is still an important factor affecting the wide application. In this study, APIm with positive amino group was adsorbed to the surface of the carboxylated polyacrylonitrile (PAN) membrane by electrostatic force to reduce the fouling of sodium alginate (SA) caused by Ca 2+ . The results show that 1 v/v% APIm was selected as the optimal dosage, accompanied by the highest water flux of 330.5 L·m -2 h −1 bar −1 and bovine serum albumin (BSA) rejection rate of 91.0 %. When the concentration of Ca 2+ was increased to 10 mM, the Ca 2+ catch amount increased to 48.25 mg/cm 2 . The main anti-fouling mechanism was that APIm captured a certain amount of Ca 2+ in situ, destroyed the complex structure of sodium alginate (SA) and Ca 2+ . Then the fouling layer was easy to be removed by physical cleaning. At the concentration of 10 mM Ca 2+ , the membrane flux recovery rate of 1 v/v% APIm membrane was increased to 80.1 %. This study demonstrates a fouling control strategy for in-situ removal of Ca 2+ bound SA fouling, providing a new approach for the future development of UF membrane.
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
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 23
·4659
·
IF 2.468
Zhen Shen,Wei Chen,Hang Xu,Wen Yang,Qing Kong,Ao Wang,Mingmei Ding,Juan Shang
Membrane fouling is still a critical issue for the application of ultrafiltration, which has been widely used in water treatment due to its efficiency and simplicity. In order to improve the antifouling property, a new 2D material MXene was used to fabricate composite ultrafiltration membrane with the approach of in situ embedment during the phase inversion process in this study. Scanning electron microscopy (SEM), atomic force microscopy (AFM), thermogravimetric analysis (TGA), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), water contact angle, bovine serum albumin rejection and porosity measurements were utilized to characterize the prepared membranes. Due to the hydrophilicity of the MXene, the composite membranes obtained higher hydrophilicity, confirmed by the decreased water contact angle. All the modified membranes had a high bovine serum albumin rejection above 90% while that of the pristine polysulfone membrane was 77.48%. The flux recovery ratio and the reversible fouling ratio of the membranes were also improved along with the increasing content of the MXene. Furthermore, the highest flux recovery ratio could also reach 76.1%. These indicated the good antifouling properties of MXene composite membranes. The enhanced water permeability and protein rejection and excellent antifouling properties make MXene a promising material for antifouling membrane modification.Keywords:MXene (Ti3C2Tx);polysulfone;hydrophilicity;ultrafiltration membrane;antifouling
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
·
2020
·
IF 5.774
Jichao Wang,Jiayu Tian,Shanshan Gao,Wenxin Shi,Fuyi Cui
The low reactivity and poor compatibility of hydrophobic polymer base with hydrophilic additives poses a challenge for preparation of antifouling ultrafiltration (UF) membrane. In this work, the allyloxy nonylphenoxy propanol polyoxyethylene (SE-10N) ether ammonium sulfate (AHPS), which possessing excellent reactivity and amphiphilicity, was grafted onto PES membrane surface via dopamine triggered one-step polymerization and co-deposition process. Attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) confirmed that AHPS was easily anchored onto the membrane surface with the assistance of dopamine. Field emitting scanning electron microscope (FESEM) and atomic force microscopy (AFM) also demonstrated the formation of a new coating on membrane surface. The modified layer significantly enhanced the hydrophilicity of the ultrafiltration membrane, as confirmed by the decrease of contact angle from 77.2° to 55.8°. As a result, the modified membrane exhibited remarkably improved anti-fouling properties. The static adsorption of bovine albumin (BSA) on membrane surface was decreased from 77.2 to 34.3 µg/cm 2 . Furthermore, the modified membrane displayed higher flux recovery (95.9%) and fouling reversibility (51.6%) than unmodified membrane (56.7% and 23.0%, respectively). Besides, the modified membrane also showed better structural stability in acid and alkali solutions as compared with pure polydopamine coated membrane. Therefore, this study provided a facile approach for improving the anti-fouling performance of membranes.
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 RESEARCH & DESIGN
·
2022
·
IF 4.119
Yunwu Yu,Yan Wu,Chunyang Xie,Xiaowei Sun,Yongbin Wang,Peng Liu,Yan Wang,Changwei Liu,Ye Wan,Wenhao Pan,Tianwei Li
For the removal of textile dyes, an effective alternative to fabricate tight ultrafiltration membrane was adopted. A series of tight ultrafiltration membranes based on PEEKWC/PEI covalent crosslinking structure were prepared by phase inversion method and showed high-flux and good antifouling performance attributed to the enhancement of hydrophilicity by PEI. The top-surface of the UF membranes was with a water contact angle in range of 24.33° and 40.10° indicating the excellent hydrophilicity. These membranes containing PEI-based positively charged water channel showed high permeability for pure water and salt solutions. As the content of PEI in membrane reaching 20 wt%, the pure water permeability and pure water flux at 3 bar could reach 308 L·m −2 ·h −1 ·bar −1 and 925 L·m −2 ·h −1 , respectively. The pure water flux could even reach 1526 L·m −2 ·h −1 at 5 bar. At the operation pressure of 3 bar, all the UF membranes showed good single-component BBR rejection between 94.87 % and 97.73 %. The rejection of membranes for BBR in dye/salt mixtures was substantially higher than 94.0 % even at a high salt concentration of 60 g/L. The UF membranes with high-flux of pure water and dye solution were discussed, which could be a promising alternative for sustainable textile wastewater treatment and natural water recovery.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Hao Yang,Jiemei Zhou,Zhaogen Wang,Xiansong Shi,Yong Wang
Fouling resistance of ultrafiltration (UF) membranes is critical for their long-term usages in terms of stable performance, so convenient approaches to prepare fouling-resistant membranes are always anticipated. Herein, we demonstrate the facile fabrication of antifouling polysulfone- block -poly(ethylene glycol) (PSF- b -PEG, SFEG) composite membranes. SFEG layer was coated onto macroporous supports and cavitated by immerging them in acetone/ n -propanol following the mechanism of selective swelling induced pore generation. Thus-produced SFEG membranes possessed high permeance and excellent mechanical strength. Meanwhile, the structures and separation performances of the SFEG layers can be continuously tuned through simply changing swelling durations. More importantly, the hydrophilic PEG chains were spontaneously enriched onto the pore walls through swelling treatment, endowing intrinsic antifouling property to the SFEG membranes. Bovine serum albumin (BSA)/humic acid (HA) fouling tests proved the prominent fouling resistance of SFEG membranes, and the fouling resistance is expected to be long-standing because of the firm connection between PEG chains and PSF matrix by covalent bonding.
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
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 6
·2650-2657
·
IF 0
Zhen-Xing Wang,Cher-Hon Lau,Nai-Qing Zhang,Yong-Ping Bai,Lu Shao
Novel hybrid coatings with excellent wettability are architecturally constructed on the surfaces of different types of separation membranes via simultaneous polymerization of mussel-inspired dopamine and hydrolysis of commercially available and low-cost silane through a highly efficient one-step approach. After coating with the designed hybrid coatings, the ultrafiltration (UF) membranes possess high hydrophilicity and excellent dry storage ability while the microfiltration (MF) membranes are endorsed with superhydrophilicity and underwater superoleophobicity. Such unique UF and MF membranes can be deployed for treating protein-rich water with drastically enhanced functions and separating oily water (oil-in-water emulsion) under atmospheric conditions with ultrahigh water flux and superior antifouling abilities. This versatile strategy to tailor membrane surface wettability paves the way for separation membranes to be used in harsh water environmental remediation and greatly stimulates the rapid development of mussel-inspired pDA based hybrid materials for advanced applications.
研究领域:
材料科学
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环境科学
·
生物仿生学
✓ 已验证
DOI
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Cunyu Li,Yun Ma,Hongyang Li,Guoping Peng
With the rapid increase of water contamination, membrane separation technology and their corresponding molecular weight cut-off (MWCO) evaluation method become more necessary. In this study, Panax notoginseng saponins was used as a new standard marker to determinate ultrafiltration (UF) membrane MWCOs, series of Millipore membranes were selected as control group to analyze and calculate the relationship between retention rate and MWCOs with exponential or logarithmic equation. A new and convenient method was provided for determining the membrane MWCO by modeling analysis retention rate with MWCOs, and the regression coefficients ≥ 0.990. The feasibility and practicability of established method was verified by different manufactures' membrane and dextrans . In the detection progress, as the main ingredient of Panax notoginseng saponins , Notoginsenoside R 1 , Ginsenoside Rg 1 , Ginsenoside Rb 1 and Ginsenoside Rd with different surface activity, the MWCO range of UF membranes can be divided into two zones mainly due to the retention rate difference among Notoginsenoside R 1 , Ginsenoside Rg 1 , Ginsenoside Rb 1 and Ginsenoside Rd . Zone I, 1000–10000; and Zone II, 10000–100000. Thus, the new method would be helpful to improve the applicability of UF membrane in separation technology.
研究领域:
环境科学
·
药学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Dan Song,Lu Wang,Weikai Sun,Yingjie Zhang,Binghan Xie,Ying Zhao,Wei Wang,Peizhi Wang,Jun Ma,Wei Cheng
Ultralow pressure filtration system, which integrates the dual functionalities of biofilm degradation and membrane filtration, has gained significant attention in water treatment due to its superior contaminant removal efficiency. However, it is a challenge to mitigate membrane biofouling while maintaining the high activity of biofilm. This study presents a novel ceramic-based ultrafiltration membrane functionalized with tourmaline nanoparticles to address this challenge. The incorporation of tourmaline nanoparticles enables the release of nutrient elements and the generation of an electric field, which enhances the biofilm activity on the membrane surface and simultaneously alleviates intrapore biofouling. The tourmaline-modified ceramic membrane (TCM) demonstrated a significant antifouling effect, with a substantial increase in water flux by 60 %. Additionally, the TCM achieved high removal efficiencies for contaminants (48.78 % in TOC, 22.28 % in UV 254 , and 24.42 % in TN) after 30 days of continuous operation. The fouling resistance by various constituents in natural water was individually analyzed using model compounds. The TCM with improved electronegativity and hydrophilicity exhibited superior resistance to irreversible fouling through increased electrostatic repulsion and reduced adhesion to foulants. Comprehensive characterizations and analyses, including interfacial interaction energies, redox reaction processes, and biofilm evolutions, demonstrated that the TCM can release nutrient elements to facilitate the development of functional microbial community within the biofilm, and generate reactive oxygen species (ROS) on the membrane surface to the degrade contaminants and mitigate membrane biofouling. The electric field generated by tourmaline nanoparticles can promote electron transfer in the Fe(III)/Fe(II) cycle, ensuring a stable and sustainable generation of ROS and bactericidal negative ions. These synergistic functions enhance contaminant removal and reduce irreversible fouling of the TCM. This study provides fundamental insights into the role of tourmaline-modified surfaces in enhancing membrane filtration performance and fouling resistance, inspiring the development of high-performance, anti-fouling membranes.
研究领域:
环境科学
·
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Water
·
2025
·
IF 24.1
Chen Yuanmiaoliang,Wang Longchao,del Cerro Martina,Wang Li,Zhang Xuan,Elimelech Menachem,Wang Zhangxin
High-salinity organic wastewaters pose a major challenge for conventional wastewater treatment processes. Here we propose dialysis as an innovative solution to overcome this challenge. Dialysis uses an ultrafiltration (UF) membrane that allows the passage of salts while rejecting the organic substances, operating in a bilateral countercurrent flow mode without the application of hydraulic pressure. Using bench-scale experiments and a model for salt and water transport in leaky membranes, we demonstrate that dialysis can effectively desalinate high-salinity organic wastewaters without diluting the wastewater stream. By comparing the salt/organic selectivity of dialysis and UF using the same membrane, we show that dialysis can effectively fractionate salts and organic substances in high-salinity organic wastewaters. Additionally, we find that, unlike UF, dialysis is almost unaffected by membrane fouling, highlighting its excellent fouling resistance. We conclude by proposing potential high-salinity organic wastewater treatment schemes based on dialysis, paving the way for more sustainable and effective management of challenging wastewaters.
研究领域:
环境科学
·
水处理技术
·
膜分离技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Chunli Liu,Hongchao Mao,Jianhua Zhu,Suobo Zhang
The original quaternized cardo poly(arylene ether sulfone)s (QPES-I) ionomers was employed as the virgin polyelectrolyte and its counterions (I − ) were exchanged with F − and PF 6 − to prepare QPES with different anions(QPES-X, X = F, PF 6 ), then QPES-X/PSF blended ultrafiltration membranes was prepared by the nonsolvent induced phase inversion process. Scanning electron microscopy (SEM) was used to characterize the cross section morphology and surface morphology of blended membranes, and atom force microscopy (AFM) was employed for obtaining the three-dimensional images of QPES-X/PSF blended membranes, respectively. The surface chemical composition of the asymmetric membrane was investigated by X-ray photoelectron spectroscopy (XPS). Under similar preparation conditions, the water contact angle on membrane surface increased in the order of QPES-F < QPES-I < PSF < QPES-PF 6 , while the pure water flux of the membranes decreased with that order. The results revealed that the surface and cross section morphology, surface roughness, QPES-X content on membrane surface, as well as the hydrophilicity and performance of blended membranes were closely related to the counterions of QPES-X. Membrane prepared with QPES-F is hydrophilic and possesses outstanding performance among all the investigated materials, demonstrating a water flux of 2163 L m −2 h −1 and BSA rejection of 93% at an 18 wt% polymer concentration and 15% QPES-F content. Antimicrobial activity studies demonstrate that the blended membrane having 15% QPES-F possess a sterilization rate of 73% towards E . coli .
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xinyi Wang,Zezhen Zhang,Weishan Deng,Haolan Xiao,Liming Xia,Lili Wu
Carbon nanotube (CNT) is a promising raw material for membrane fabrication due to its good electrical conductivity, great specific surface area, and special piping structure. In this report, tannin (TA), CNT, and D-aspartic acid (DAS) were co -deposited on the surface of polyethersulfone (PES) ultrafiltration membrane to construct an electrically responsive coating. The membrane can maintain the high electrical conductivity while avoiding the membrane defects due to the accumulation of CNTs and the different lengths of chain segments in the process of CNT co-blending to form the membrane. The results show that the average pore size of the membrane is reduced from 19.55 nm to 8.165 nm, and the retention capacity is greatly improved, showing good separation efficiency (99.5 %) and hydrophilicity (water contact angle of 13°). Through adsorption and electric field deflection, CNT endows the membrane with the ability to selectively separate dyestuffs with different electrically charged properties. Long-term stability tests show that the modified membrane still maintains a high level of pure water flux and conductivity after seven days of operation. This paper is of exploratory significance in the field of electrically responsive smart membranes for dye separation. The membrane developed in this study exhibits unique selective separation performance and can dynamically adjust its separation efficiency by externally controlling the electric field strength. This demonstrates its excellent intelligence, making it highly promising for applications in electrically responsive intelligent separation membranes. Additionally, it offers a novel approach for treating dye-containing wastewater using electrically charged functional membranes.
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
危险品化学品经营许可证（带存储）