JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Sikuai Xue,Chengcai Li,Jiuming Li,Hailin Zhu,Yuhai Guo
To improve hydrophilicity and anti-fouling property of the polytetrafluoroethylene (PTFE) flat microfiltration (MF) membrane, a facile method was developed to modify the membrane via the co-deposition of catechol (CA) and polyethyleneimine (PEI) followed by surface mineralization of γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH560). The surface chemical composition, surface morphology, hydrophilicity and filtration performance of the PTFE flat membrane were investigated by ATR-FTIR, XPS, FESEM, WCA and pure water flux measurements, respectively. After using this low-cost and simple modification method, the PTFE flat membrane was endowed with excellent hydrophilicity, high water permeation flux and superior anti-fouling property. Then, the oil/water separation tests were conducted using the modified PTFE flat membranes. The size distribution of the oil droplets is between 0.12–1.44 µm and the mean pore size of pristine PTFE flat MF membrane is 0.22 µm. The as-prepared hydrophilized PTFE flat membranes possess an excellent oil resistant ability with oil rejection ratio near 99%. Finally, the surface stability of the modified membrane was studied and the mineralized membrane showed excellent acid resistant ability. Therefore, this facile strategy holds attractive potential practical application in water environmental remediation.
研究领域:
材料科学
·
环境工程
·
膜技术
·
表面化学
·
水处理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jingying Xu,Teng Hou,Jing Zhou,Hao Ye,Yaru Wang,Lvzhu Cheng,Xianglong Li,Bin Yang
Photocatalytic fibrous membranes are regarded as one of the most proficient materials for environmental remediation because of their excellent photocatalytic activity, porous structure, and outstanding recyclability. However, the poor dispersion performance of photocatalysts in the polymer matrix and the low migration ability to the surface constrain the development of this technology. In this study, a versatile strategy was developed to facilitate the design of hydrophilic nanofibrous membranes with promising photocatalytic activity and robust recyclability by combining the loaded rare earth element La 3+ modified TiO 2 photocatalyst, introducing hyperbranched polymers as dispersants within electro-centrifugal spinning, and applying post-treatment to construct hydrophilic sites. Significantly, the removal efficiency of the fibrous membrane materials on the dye wastewater was as high as 89.34 %, and the treatment efficiency can still reach 81.68 % after five cycles. In addition, the photocatalytic mechanism for the degradation of organic pollutants was also analyzed. This work provides a new method for building advanced photocatalytic nanofibrous membranes, which is expected to be used in the treatment and remediation of environmental wastewater.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
化学工程
·
光催化
·
高分子材料
·
水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
He Chen,Liang Kong,Yong Wang
Activation by nitric acid oxidation has been combined with atomic layer deposition (ALD) to modify microporous polypropylene (PP) membranes. Nitric acid oxidation with prewetting of t -butanol generates active groups on the inert surface of PP membranes. Metal oxides including Al 2 O 3 and TiO 2 are subsequently ALD-deposited on the activated membrane. Nitric acid oxidation is a mild approach to activate PP membranes. A short immersion in nitric acid for 10 min is able to generate oxygen/nitrogen-containing active species on the membrane surface , which leads to an evident increase (38%) in the membrane permeability. The mechanical stability and the integrity of the porous structure are well preserved after activation. Surface elemental analyses and microscopy observations confirm the successful deposition of metal oxides thin layers onto the activated membranes. In the deposition of either Al 2 O 3 or TiO 2 , the hydrophilicity of the deposited membranes is continuously improved with increasing ALD cycles, resulting in further increase in water flux. After 100 ALD cycles, the flux is doubled compared to that of the bare membrane. Al 2 O 3 is more efficient in enhancing the hydrophilicity and permeation than TiO 2 under identical deposition conditions because of the faster growth of Al 2 O 3 on the activated PP surface.
研究领域:
材料科学
·
膜技术
·
表面化学
·
高分子化学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Hashim Sliman,Xue Dong,Tao Zhao
In recent years, increasing environmental awareness and human skin protection from harmful radiation of the sun has attracted attention amongst numerous researchers. Here, a simple strategy was developed to enhance the hydrophilicity and ultraviolet (UV) protection of polyethylene terephthalate (PET) knitted fabric surface via grafting green cowpea protein (CP) with gum arabic modified epoxy (GAE) as a cross-linking agent. Chemical grafting between pretreated PET and GAE as well as between GAE and CP improved the hydrophilicity and UV protection of PET knitted Fabric. The enhanced surface wettability was confirmed by the decreased water contact angle from 135° to zero °. Moreover, the UV protection factor rating of modified PET knitted fabric was higher, indicating that the modifier layer caused scattering and absorbance of UV light. This approach has shown promising results for improving hydrophilicity and UV protection with sustained mechanical durability of 7 washing cycles.
研究领域:
材料科学
·
纺织化学
·
表面工程
·
生物高分子
·
功能纺织品
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Tao Zhang,Zhiyuan Ling
Architecture construction of electrode is one key factor for hydrogen generation from electrochemical water splitting. To enhance the efficiency of oxygen evolution reaction (OER) at high current density , the architecture construction must be designed skillfully to prevent the surface blanketed by gas bubbles. In this work, we developed a three-level hierarchical surface with cluster-like nickel (Ni) nanowire array. The contact angle measurement indicates the surface having excellent hydrophilicity . The OER performance characterization reveals that after the surface is loaded with NiFe-based catalyst the Ni nanowire array electrode can deliver 500 mA cm −2 at an overpotential of 297 mV in 1 M KOH solution and can survive for over 24 h under 500 mA cm −2 operation. All the results demonstrate that the cluster-like nanowire array is beneficial for the spatial pathway separation for electrolyte supply and gas bubbles departure and the enhancement of OER efficiency.
研究领域:
材料科学
·
电化学
·
能源材料
·
纳米技术
·
催化化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2012
·Vol. 213
·期 20
·2192-2200
·
IF 2.361
Xiao-Hui Dai,Chun-Yan Hong,Cai-Yuan Pan
A novel double-hydrophilic block copolymer P(MEO 2 MA- co -OEGMA)- b -PAMA has been successfully synthesized by two-step RAFT polymerization. Then, the amino groups of PAMA blocks in the copolymers react with 1-pyrenecarboxaldehyde via a “Schiff-base” reaction, and the resulting copolymers are self-assembled to form spherical micelles in aqueous solution. Because the “Schiff-base” linkage is pH sensitive, the release rate of pyrene depends upon the pH of solution. Complete release is achieved at pH 1, and the control release is much faster at pH 5.5 than that at pH 7.4. With progress of pyrene release, the micelles are disassembled gradually and disappeared completely at last. This double-hydrophilic copolymer is a promising candidate of drug carrier for the aldehyde- containing hydrophobic drugs.
研究领域:
高分子化学
·
药剂学
·
纳米医学
·
生物材料
·
药物递送系统
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 43
·34199-34205
·
IF 3.84
Ren Liu,Junchao Zheng,Zhiquan Li,Jingcheng Liu,Xiaoya Liu
A facile method to prepare surface self-concentration antibacterial coating with contact-killing mechanism was developed. Photo curable quaternary ammonium compound QAC bearing a 16-carbon alkyl chain and a terminal methacrylate was synthesized as reactive antibacterial additive. After UV irradiation, QAC was crosslinked in the soy-based coating matrix. With proper amounts of QAC, the UV cured coatings exhibited good properties such as high glossiness, good hardness and fine adhesion to cherrywood substrates. The self-concentration property of QAC on the cured coating surface, which is beneficial to reserve the physical properties of the bulk materials and to improve the surface antibacterial activity, was confirmed by fluorescence and X-ray photoelectron spectroscopy. Moreover, the introduction of QAC provided the coatings with superhydrophilicity property as well as good anti-fog capacity. The coatings with 8 wt% of QAC (charge density = 8.6 mol cm−2) exhibited almost 100% antibacterial activity against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli by 5 log reduction. The contact-killing mechanism of coatings was confirmed via the zone of inhibition tests. The straightforward preparation combined with excellent antibacterial property makes the QAC containing coatings quite promising in antibacterial coatings realm and is suitable for industrial-scale manufacturing.
研究领域:
材料科学
·
高分子化学
·
表面工程
·
抗菌材料
·
涂层技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 24
·16383-16392
·
IF 2.993
Wu Yadong,Wang Fang,Li Xianglong,He Jinmei,Huang Yudong
The synergic effect between each component in composite membrane has created a new concept to fabricate membrane materials and widen their applications. Previous trials have suggested that micrometer-scale aramid fiber (MAF) could be effectively split into nanoscale aramid fiber (NAF) by dissolution in DMSO/KOH. Addressed herein is a time-saving approach to incorporate graphene oxide (GO) together with NAF to fabricate composite membranes through π–π stacking interactions. NAF–GO composite membranes (GO/NAF) containing gradient contents of GO have been prepared using absolute ethanol as proton donor, making the drying process facile and fast. The obtained composite membranes exhibit excellent hydrophilicity and enhanced mechanical performance. The chemical structure, morphology, crystallization and mechanical strength of GO/NAF composite membranes are characterized, respectively, and the hydrophilicity of GO/NAF is also evaluated by static water contact angle measurements. In the case of medium GO content (1 wt%) used in this study, the composite membrane possesses both optimal mechanical performance and better hydrophilicity compared to other supplementations, indicating that absolute ethanol is a promising proton donor for flocculation, which makes the post-treatment process more economic.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
膜科学
·
表面科学
✓ 已验证
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2020
·Vol. 217
·期 6
·1900536
·
IF 1.759
Parisa Zeaiean Firouzabadi,Hajar Ghanbari,Nafiseh Mahmoudi,Seyed Mohammad Amin Haramshahi,Jafar Javadpour
Polymer-based composites are used for wound healing applications. This work aims to prepare an inorganic-polymer nanocomposite based on bentonite, poly(vinyl alcohol), and bacterial cellulose by electrospinning for wound healing. The nanocomposite is synthesized using a solution intercalation technique, with 1–2 wt% nanobentonite concentration variation. The effects of commercial and laboratory-synthesized nanobentonite as well as the extract of the green walnut shell (EGWS) are examined and characterized by different techniques. The addition of nanobentonite increases the average size of fibers and tensile strength up to 200 nm and more than 15 MPa, respectively, due to the presence of hydrogen bonding formed between the nanobentonite sheets and polymer matrix. By the addition of synthetic nanoclay and EGWS, moderate elongation and strength are achieved. The hydrophilicity shows a decreasing trend up to 2 wt% of commercial nanobentonite; however, the laboratory-synthesized nanobentonite is not significantly effective. Effects of extracts on the viability of cultured human adipose tissue–derived mesenchymal stem cells (ADSCs) are quantitated, where the samples containing 1–2 wt% of commercial nanobentonite have less toxicity than others. Antibacterial activity is tested against both Escherichia coli and Staphylococcus aureus bacteria according to the agar diffusion test for 72 h, in which EGWS-based mats exhibit strong antimicrobial activity.
研究领域:
生物材料学
·
组织工程
·
纳米医学
·
再生医学
·
药剂学
·
微生物学
·
高分子科学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2014
·
IF 2.822
Fu Liu,Bi-rong Ma,Dong Zhou,Li-Jing Zhu,Yin-Yi Fu,Li-xin Xue
A novel positively charged loose nanofiltration (NF) membrane was fabricated feasibly by UV-induced photografting polymerization of diallyl dimethyl ammonium chloride (DADMAC) on Polysulfone ultrafiltration membrane. A possible reaction mechanism was proposed that a linear chain structure and/or pyrrole like five-membered nitrogen heterocycles structure on the side chain were grafted to form the active barrier layer. NF membrane demonstrated a looser average pore size of 8.6 nm and positive charges surface. Owing to the nanoscale ultrathin nanoscale barrier layer and the combination of Donnan exclusion and steric hindrance , NF membrane exhibited good hydrophilicity , a high pure flux of 60 L/m 2 h (0.5 MPa), a good salt rejection to Mg 2+ (90.8%), Al 3+ (94.0%), Ca 2+ (91.5%), and a high dye rejection to methylene blue (99.4%) and congo red (100.0%) respectively. The salts rejection of NF membrane to different salts followed the order of AlCl 3 > CaCl 2 > MgCl 2 > NaCl > LiCl > MgSO 4 > Na 2 SO 4. NF membrane showed certain fouling resistance to seawater and BSA solution. The grafting polymerization kinetics were comprehensively investigated including irradiation time, monomer concentration and irradiation intensity. X-ray Photoelectron Spectroscopy (XPS), scanning electron microscopy (SEM), atomic force microscopy (AFM) and contact angle measurement were employed to investigate membrane chemistry, morphologies, and hydrophilicity.
研究领域:
材料科学
·
环境工程
·
膜分离技术
·
高分子化学
·
水处理
✓ 已验证
DOI
高影响因子
DESALINATION
·
2012
·
IF 2.59
Lei Ling,Yuming Zhou,Jingyi Huang,Qingzhao Yao,Guangqing Liu,Peixin Zhang,Wei Sun,Wendao Wu
In an attempt to control Ca 3 (PO 4 ) 2 , CaCO 3 , and CaSO 4 deposits in industrial recycling water systems, an acrylic acid (AA)-allyloxy poly(ethylene glycol) polyglycerol carboxylate (APEG-PG-COOH) copolymer was synthesized as a nonphosphorus inhibitor. The synthesized polymer was characterized by 1 H NMR. The performance of PAA/APEG-PG-COOH on inhibition of Ca 3 (PO 4 ) 2 , CaCO 3 and CaSO 4 precipitation was studied through static scale inhibition tests. It was shown that PAA/APEG-PG-COOH exhibited excellent ability to control inorganic minerals, with approximately 100% CaSO 4 inhibition and 99.89% Ca 3 (PO 4 ) 2 inhibition at levels of 3 and 6 mg/L PAA/APEG-PG-COOH, respectively. PAA/APEG-PG-COOH also displayed ability to prevent the formation of CaCO 3 scales. The effects on formation of Ca 3 (PO 4 ) 2 , CaCO 3 and CaSO 4 were investigated with combination of Scanning electronic microscopy (SEM), Transmission electron microscopy (TEM), and X-ray powder diffraction (XRD) analysis, respectively.
研究领域:
环境化学
·
材料科学
·
工业水处理
·
高分子化学
·
腐蚀与防护
·
矿物结垢控制
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Qiang Xu,Yang Yang,Jie Yang,Xiaozu Wang,Zhaohui Wang,Yong Wang
Conformal and smooth TiO 2 thin layers were coated on the surface of porous PTFE membranes subjected to a plasma activation process by atomic layer deposition (ALD). In contrast, TiO 2 was deposited on the PTFE surface as globular particulates without plasma activation due to the inert chemical nature of PTFE surface. X-ray photoelectron spectrometry confirmed the formation of functional groups on the plasma-activated PTFE surface which served as active sites for the homogeneous adsorption and reaction of ALD precursors. Scanning and transmission electron microscopy revealed the uniformity of the deposited layer and the precise control of its thickness by changing ALD cycle numbers. The water contact angle measurement showed that the hydrophobic surface gradually turned to be near superhydrophilic with the increment of ALD numbers. Also, the membrane mean pore size was progressively reduced by simply altering the ALD numbers. At proper deposition conditions , the modified membranes gained an increase of pure water flux of more than 150% and simultaneously a doubled retention compared to the original unmodified membrane. This research provides an efficient approach devoid of any harsh treatments to modifying PTFE membranes for achieving specific functions, which also can be applied to other organic materials especially with chemical inert surface.
研究领域:
材料科学
·
膜科学与技术
·
表面工程
·
高分子化学
·
环境工程
·
纳米科技
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）