JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Yantao Song,Meng Yan,Zixuan Xu,Benqiao He,Biao Wu,Jianxin Li,Zhenyu Cui
In this study, the 3-Aminopropyltriethoxysilane (APTES) was first grafted onto TiO 2 nanoparticles (APTES-TiO 2 nanoparticles), which were then introduced the membrane surface by reacting with anhydride on the membrane surface and Schiff base reaction with the PEI-TA. There are two types of hollow fiber hybrid membranes with varying nanoparticle distributions were constructed. The influence of hybrid mode on the ability of anti-oil fouling was researched. The results indicated that the PVDF@TiO 2 hybrid membrane has a flux recovery rate of 96.68 % and a total flux decline rate of 15.52 %, indicating a good anti-emulsified oil fouling performance. By characterizing the anti-oil droplets adhesion, water-binding capacity, surface charge of membrane and concentrate system coacervate size, the coalescence ability of the hybrid membrane to the oil droplets and the spreading behavior of oil droplets on the surface were uncovered. Ultimately, the anti-fouling mechanism “hydration layer &rigid layer obstruction-electrostatic coalescence” was proposed, which can reasonably explain the weakness of the interplay between the membrane surface and oil droplets, thus slowing down the attaching and spreading of emulsified oil droplets. This study laid the foundation for developing hybrid membranes with high resistance to emulsified oil fouling ability. The proposed anti-fouling mechanism can provide new ideas for the efficient purification of oily wastewater.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
FIBERS AND POLYMERS
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2020
·Vol. 21
·期 8
·1760-1766
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IF 1.797
Hu Jinyan,Wu Dingsheng,Feng Quan,Wei Anfang,Song Beibei
Currently, the preparation of novel efficient and recyclable photocatalysts for pollutant degradation in water has become a research hotpot. In this study, a TiO 2 -loaded non-woven polypropylene/bacterial cellulose (TiO 2 -loaded NPBC) composite film was prepared by a biological culturing method. The TiO 2 nanoparticles were spontaneously embedded into the prepared composite film. Then, the composite film was used to degrade methylene blue (MB) and its degradation effects were explored. The morphology of the composite film was investigated. It was clear that a large amount of TiO 2 nanoparticles were embedded into the composite membrane during the biological culturing method. The experimental results confirmed that the TiO 2 -loaded NPBC composite film had good degradation performance and reusability. When the reaction time was 120 min, the removal rate of MB by the film was 92.8 %. The removal rate remained above 85 % after 5 degradation cycles.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
Polymer-Plastics Technology and Materials
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2019
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IF 0
Linshuang Li,Yong Xu,Jianfei Che,Liu Xiaohong,Wei Zhao,Zhifeng Ye
A series of white fluorinated polyimide/TiO2 composite films were prepared by a solution mixing method. They showed high tensile strength beyond 95.1MPa and excellent insulting property with surface and volume resistances exceeding 1.9 × 1011Ω and 2.3 × 1012 Ω cm, respectively, coupled with water absorptions below 1.1%, water contact angles up to 95.9 and whiteness beyond 58.5. It was found that their optical transparency decreased dramatically with the increasing doping of TiO2. The thermal degradation of pure fluorinated polyimide (FPI) and representative polyimide/TiO2 composite film with 5 wt% of TiO2 (PI/TiO2-5 wt%) was also studied.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
RSC Advances
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2017
·Vol. 7
·期 66
·41838-41846
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IF 3.108
Yanqing Du,Yujiang Li,Tao Wu
Oil/water separation has become a worldwide challenge due to large volumes of industrial oily wastewater and frequent oil spill accidents, which constitute an enormous threat to human and biological safety. Herein, a superhydrophilic and underwater superoleophobic composite membrane was fabricated using the vacuum-assisted filtration technique of assembly of chitosan (CS) and titanium dioxide (TiO2) on a cellulose acetate membrane for emulsified oil separation. The hydrophilic chitosan–TiO2 (CST) composite and nanoscale hierarchical structure are beneficial for forming a water layer that can repel the infiltration of oil droplets into the membrane. The modified membrane demonstrated an excellent flux up to 6002.5 L m−2 h−1 for hexadecane-in-water emulsion, which is one order of magnitude higher than traditional filtration membranes. Furthermore, the separation efficiency for all of the emulsified oils is above 97%, indicating superior oil/water separation performance. Most importantly, the modified membrane can maintain underwater superoleophobicity even in corrosive aqueous media, including strongly acidic, strongly alkaline, and highly saline solutions. It is expected that the chitosan–TiO2 composite membrane can be potentially useful in treating oily wastewater from industry and daily life.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Yilin Wu,Chunxiang Li,Minjia Meng,Peng Lv,Xinlin Liu,Yongsheng Yan
Herein, the GO/TiO 2 -based molecularly imprinted nanocomposite membranes (GT-MIMs) with high selectivity and constitutionally structural stability were developed by by the incorporation of polydopamine (pDA) membrane modification technique and the simple vacuum filtering method. Instead of constructing imprinted polymers onto pristine membrane surfaces, a versatile filtering strategy was conducted on the membrane surfaces by using GO and TiO 2 as the nanocomposite structures. And the GT-MIMs were finally obtained after a two-step-temperature imprinting process by using propranolol as the template molecules. Moreover, attributing to the formation of this membrane-based multilevel nanocomposite surfaces, largely enhanced propranolol-rebinding capacities (53.44 mg/g), permselectivity (separation factors were all more than 16.5) and structural stability (still maintained 92% of the maximum adsorption capacity after 11 cycling operations) were easily achieved. These results strongly illustrated that this GO/TiO 2 -based imprinting membrane materials would achieve both the high rebinding capacity and the excellent permselectivity. All the synthesis processes were carried out at low temperature and ordinary pressure, which were energy-efficient and environmentally friendly for large-scale application.
研究领域:
材料科学
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环境科学
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生物医学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2015
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IF 2.711
Zhengyi Zhang,Jiajie Yu,Jingying Yang,Xiang Lv,Tianhe Wang
Porous Ag/TiO 2 composite films were prepared by spin coating of titania on normal glass slides and subsequent photochemical deposition of silver nanoparticles (AgNPs). The films were characterized by XRD and FESEM to reveal micro structural and morphological differences between films obtained under varied conditions. The SERS properties of these films were investigated using aqueous crystal violet (CV) as probe molecules. The results indicate that the content of polyethylene glycol (PEG) and photo-reduction time had significant influences on both the microstructure and SERS performance of Ag/TiO 2 films. The highest SERS sensitivity that allowed as low as 10 −10 M aqueous CV to be detected, was achieved with the PEG/(C 4 H 9 O) 4 Ti molar ratio being 0.08% and with 30 min of UV irradiation. With this film a linear relationship was established through experiment between SERS intensity and CV concentration from 10 −10 to 10 −5 M, which could be used as a calibration curve for CV concentration measurement. In addition, the film could be reused as a SERS substrate for up to four times without significantly losing SERS sensitivity if a simple regeneration was followed. It is visualized that the Ag/TiO 2 film on glass has potentials for being developed into a practical SERS substrate with high sensitivity and good reusability.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）