AICHE JOURNAL
·
2017
·Vol. 64
·期 3
·993-1000
·
IF 2.836
Huimin Liu,Yuliang Jiang,Jincheng Ding,Wenhui Shi,Jiefeng Pan,Congjie Gao,Jiangnan Shen,Bart van der Bruggen
Surface modification of anion exchange membranes (AEMs) by attaching a negatively charged layer is the main method for preparing monovalent anion selective membranes. However, tremendous increase of membrane resistance and poor long-term stability of the modified membranes face great challenges. In this work, a photosensitive molecule (4,4-diazostilbene-2,2-disulfonic acid disodium salt [DAS]) was infiltrated into the membrane surface and immobilized in the structure by cross-linking under UV irradiation. This method introduced negative charge to the surface layer of the AEMs without increasing membrane thickness, leading to high performance membrane with high monovalent anion selectivity. The optimized membrane (D-5) shows the highest perm-selectivity of 11.21, which is superior to the commercial selective membrane Selemion ® ASV and previously reported monovalent anion selective AEMs. Furthermore, the newly developed membrane exhibits excellent long-term stability, which can maintain constant selectivity during the 80 h ED experiment. © 2017 American Institute of Chemical Engineers AIChE J , 64: 993–1000, 2018
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Guiliang Li,Yang Liu,Jiaping Chen,Shuting Xu,Na Lu,Haibo Lin,Fu Liu
Fouling is the pending issue of conspicuous two-dimensional membranes for complex wastewater treantment. Here, we first report a hybrid-dimensional cosubstantial [0D+2D] covalent triazine framework (CTF) membrane to sort out the membrane fouling via solar-cleaning strategy. The intersertal 0D CTF-0 in lamellar membrane as “pillar” offers interspacing pathways for selective separation of sub/micrometer oily emulsions and nanometer dyes. It also acts as cosubstantial “joint” to improve electron/hole separation efficiency under sunlight irradiation, which activated peroxymonosulfate to achieve effective membrane solar-cleaning via free and non-free radical way. Both the surfactant adsorbed on the membrane and the oil and dye molecules trapped on the membrane surface by the pore sieving could all be efficiently removed via the photocatalytic degredation. The interfacial solar-thermal effect also contributed to the removal of volatile oils. This featured photocatalytic membrane prepared via hybrid-dimensional and cosubstantial CTF nanomaterials offers a promising way for sustainable fouling alleviation.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Shiqiang Liang,Jinghui Wu,Chi Wang,Xiaoxuan Zhao,Chuang Wang,Xia Yang,Hongliang Huo,Tong Wang,Zhi Geng,Xianze Wang
The emerging self-supporting symmetric membrane has shown great promise in the field of forward osmosis (FO) separation due to the elimination of internal concentration polarization (ICP). The selective permeability and mechanical properties of membrane materials are the keys to determining the comprehensive properties of such ultra-thin membranes. In this study, a series of carboxylated poly (aryl ether sulfone) (PAES-COOH) materials were designed and synthesized for the fabrication of high performance self-supporting symmetric FO membranes. Owing to the superior character of polymer materials and the introduction of hydrophilic charged carboxylic groups in their molecular structure, these prepared self-supporting symmetric FO membranes with a thickness of ~2.5 μm exhibited excellent mechanical robustness and outstanding permselectivity , so that they could maintain structural integrity and show a high water/salt selectivity in the process of long-term forward osmosis separation. The series of fabricated PAES-COOH membranes displayed the Young's modulus surpass 1.76 GPa, the tensile strength exceed 72.6 MPa, and the elongation at break overtop 70.2%. Additionally, the optimal PAES-COOH-80 membrane sample demonstrated a remarkable H 2 O/Na 2 SO 4 selectivity of 1673.8 L mol −1 . This study provides an effective strategy for conveniently fabricating high-performance self-supporting symmetric FO membrane.
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
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Siyu Cao,Akshay Deshmukh,Li Wang,Qi Han,Yufei Shu,How Yong Ng,Zhongying Wang,John H. Lienhard
The demand for highly permeable and selective thin-film composite (TFC) nanofiltration membranes, which are essential for seawater and brackish water softening and resource recovery, is growing rapidly. However, improving and tuning membrane permeability and selectivity simultaneously remain highly challenging owing to the lack of thickness control in polyamide films. In this study, we fabricated a high-performance interlayered TFC membrane through classical interfacial polymerization on a MoS2-coated polyethersulfone substrate. Due to the enhanced confinement effect on the interface degassing and the improved adsorption of the amine monomer by the MoS2 interlayer, the MoS2-interlayered TFC membrane exhibited enhanced roughness and crosslinking. Compared to the control TFC membrane, MoS2-interlayered TFC membranes have a thinner polyamide layer, with thickness ranging from 60 to 85 nm, which can be tuned by altering the MoS2 interlayer thickness. A multilayer permeation model was developed to delineate and analyze the transport resistance and permeability of the MoS2 interlayer and polyamide film through the regression of experimental data. The optimized MoS2-interlayered TFC membrane (0.3-inter) had a 96.8% Na2SO4 rejection combined with an excellent permeability of 15.9 L m–2 h–1 bar–1 (LMH/bar), approximately 2.4 times that of the control membrane (6.6 LMH/bar). This research provides a feasible strategy for the rational design of tunable, high-performance NF membranes for environmental applications.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2021
·
IF 9.501
Chong Wang,Zhi Wang,Fengrui Yang,Jixiao Wang
Thin-film composite (TFC) reverse osmosis (RO) membranes whose ultrathin selective layer is composed of polyamide (PA) have been extensively employed in desalination and purification of water. However, the poor permeability , selectivity , and antifouling properties have limited their application, thus prompting several studies. In this study, a semi-interpenetrating polymer network (semi-IPN) based on PA and poly (N-vinyl-2-pyrrolidone) (PVP) was fabricated via in situ polymerization to enhance the permselectivity and antifouling property of RO membrane. The successfully fabricated PA/PVP semi-IPN was characterized using Fourier transform infrared (FT-IR), zeta potential , and X-ray photoelectron spectroscopy, X-ray diffraction measurements. Atomic force microscopy and water contact angle measurement showed that the hydrophilicity of the membrane was substantially improved. The optimal resultant membrane (0.5–10s-NVP) showed 43.2% and 0.2% increments in water flux and salt rejection, respectively. Furthermore, the antifouling performance was substantially improved; the 0.5–10s-NVP exhibited a lower decline ratio in the normalized water flux after the bovine serum albumin fouling process. Furthermore, the good stability of the semi-IPN was revealed via FT-IR after a 7-d continuous crossflow test. This work provides a guideline for physicochemical properties and microstructural design of novel RO membranes.
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
危险品化学品经营许可证（带存储）