Jia-Shan Gu
Anhui Normal University
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Featured researches published by Jia-Shan Gu.
Water Research | 2008
Hai-Yin Yu; Zhao-Qi Tang; Lei Huang; Gang Cheng; Wei Li; Jin Zhou; Meng-Gang Yan; Jia-Shan Gu; Xian-Wen Wei
To improve the antifouling characteristics of polypropylene hollow fiber macroporous membranes in a submerged membrane-bioreactor for wastewater treatment, the membranes were surface modified by H(2)O plasma treatment. Structural and morphological changes on the membrane surface were characterized by X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microscopy (FE-SEM). The change of surface wettability was monitored by contact angle measurement. The static water contact angle of the modified membrane reduced obviously with the increase of plasma treatment time. The total surface free energy and its dispersive component decreased, while the polar component increased with the increase of treatment time. The relative pure water flux for the modified membranes increased gradually with the increase of plasma treatment time. The tensile strength and the tensile elongation at break for the membranes decreased after plasma treatment. After continuous operation in a submerged membrane-bioreactor for about 68 h, flux recovery after water and caustic cleaning, flux ratio after fouling were improved by 2.0, 3.6 and 22.0%, while reduction of flux was reduced by 1.1% for the 1 min H(2)O plasma treated membrane, compared to those of the unmodified membrane.
Journal of Colloid and Interface Science | 2014
Yun Wang; Li-Li Wang; Xiao-Chun He; Zi-Jun Zhang; Hai-Yin Yu; Jia-Shan Gu
A copper (I)-catalyzed azide-alkyne cycloaddition (CuAAC) grafting-to method was used to tether alkyne-terminated poly(2-acrylamido-2-methyl propane sulfonic acid) (alkyne-PAMPS) to the azide functionalized macroporous polypropylene membrane (MPPM-N3). Alkyne-PAMPS was synthesized by the reversible addition-fragmentation chain transfer polymerization (RAFT) of AMPS with an alkyne-terminated trithiocarbonate served as a chain transfer agent. The combination of RAFT polymerization with click chemistry to graft polymer to the surface of polypropylene membrane produced relatively high grafting density and controllable grafting chain length. The structure and composition of the modified and unmodified MPPM surfaces were analyzed by attenuated total reflection-Fourier transform infrared spectroscopy (ATR/FT-IR), X-ray photoelectron spectroscopy (XPS); field emission scanning electron microscopy (FE-SEM) was employed to observe the morphological changes on the membrane surface. The permeation performances were tested by the filtration of protein dispersion. The experimental results show that with the grafting degree going up, the relative flux reduction decreases, while the relative flux recovery ratio increases, and the protein fouling is obviously mitigated by tethering PAMPS to the membrane surface. The modified membranes can be potentially applied for fouling reduction during the filtration of proteins.
Chinese Journal of Polymer Science | 2018
Jing-Jing Wu; Jin Zhou; Jing-Qiu Rong; Yao Lu; Hui Dong; Hai-Yin Yu; Jia-Shan Gu
Branch length and density have critical effects on membrane performances; however, it is regarded to be traditionally difficult to investigate the relationship due to the uncontrolled membrane modification methods. In this study, zwitterionic polymer with controlled grafting branch chain length (degree of polymerization) and grafting density (grafting chains per membrane area) was tethered to the microporous polypropylene membrane surface based on the combination of reversible addition-fragmentation chain transfer (RAFT) polymerization technique with click reaction. The modified membranes were tested by filtrating protein dispersion to highlight the correlations of branch chain length and grafting density with the membrane permeation performances. The pure water flux, the flux recovery ratio are positively and significantly, and the irreversible fouling negatively and significantly correlated with grafting density. These results demonstrate that the larger the coverage of the membrane with poly{[2-(methacryloyloxy)ethyl]-dimethyl-(3-sulfopropyl) ammonium hydroxide} (PMEDSAH), the higher the pure water flux and the higher the flux recover ratio, and the lower the irreversible fouling, which shows that high grafting density is favorable to fouling reducing.
Journal of Membrane Science | 2008
Hai-Yin Yu; Lan-Qin Liu; Zhao-Qi Tang; Meng-Gang Yan; Jia-Shan Gu; Xian-Wen Wei
Water Research | 2007
Hai-Yin Yu; Xiao-Chun He; Lan-Qin Liu; Jia-Shan Gu; Xian-Wen Wei
Materials Letters | 2004
Huaqiang Wu; Mingwang Shao; Jia-Shan Gu; Xian-Wen Wei
Journal of Membrane Science | 2008
Hai-Yin Yu; Lan-Qin Liu; Zhao-Qi Tang; Meng-Gang Yan; Jia-Shan Gu; Xian-Wen Wei
Chemical Engineering Journal | 2008
Meng-Gang Yan; Lan-Qin Liu; Zhao-Qi Tang; Lei Huang; Wei Li; Jin Zhou; Jia-Shan Gu; Xian-Wen Wei; Hai-Yin Yu
Journal of Membrane Science | 2009
Hai-Yin Yu; Wei Li; Jin Zhou; Jia-Shan Gu; Lei Huang; Zhao-Qi Tang; Xian-Wen Wei
Separation and Purification Technology | 2011
Song Yang; Jia-Shan Gu; Hai-Yin Yu; Jin Zhou; Shi-Feng Li; Xiu-Min Wu; Liang Wang