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Nanocomposite polymer hydrogels Reinforced by Carbon Dots and Hectorite Clay

Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 287-292页

作者： MA Shuai ZHENG Hang CHEN Yanjun ZOU Jincheng ZHANG Chaocan WANG Yifeng School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Herein, two nanoparticles with different dimensions, spherical carbon dots (C-dots) and sheetlike hectorite clay, were used as physical crosslinkers to fabricate C-dots-clay-poly(N-isopropylacrylamide)nanocompositehydrogels (coded as C-dots-clay-PNIPAm hydrogels). The mechanical properties, fluorescence features and thermal-responsive properties of the C-dots-clay-PNIPAm hydrogels were evaluated. The experimental results indicate that synergistic effects of C-dots and hectorite clay nanoparticles are able to significantly enhance mechanical properties of the hydrogels. The hydrogels can be stretched up to 1730%with strength as high as 250 kPa when the C-dots concentration is 0.1wt%and the clay concentration is 6wt%. The hydrogels exhibit complete self-healing through autonomic reconstruction of crosslinked network a damaged interface. The hydrogels show favorable thermal-responsive properties with the volume phase transition around 34℃. In addition, the hydrogels are endowed with fluorescence features that are associated with C-dots in the hydrogels. It can be expected that the as-fabricated C-dots-clay-PNIPAm hydrogels are promising for applications in sensors, biomedical carriers and tissue engineering.

关键词： polymer hydrogels nanocomposite reinforcement carbon dots hectorite clay

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Preparation of pH-sensitive Composite Nanofiltration Membrane

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Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 44-48页

作者：刘建立王薇 Key Laboratory of Hollow Fiber Membrane Materials and Membrane Process Tianjin Polytechnic University Tianjin Motian Membrane Engeering and Technology Co. Ltd.

Positively charged composite nanofiltration （NF） membranes were prepared through interfacial polymerization of poly[2-（N,N-dimethyl amino）ethyl methacrylate]（PDMAEMA） on porous polysulfone （PSF） substrate membranes. The effects of pH on swelling ratio （SR） of the pure crosslinked PDMAEMA membrane and on separation performances of the composite NF membrane were investigated. The results show that the quaternized amino groups produced through interfacial polymerization technique are soluble in both phases, which accelerate the crosslinking reaction as self-catalysts. The swelling/contracting behavior of the pure crosslinked PDMAEMA exhibited a well reversible pH sensitive property. Importantly, the rejection and flux of the composite NF membrane show pH-sensitive behavior in NF process. Furthermore, with the help of a relatively novel method to measure membrane conduction, the true zeta potentials calculated on the basis of the streaming potential measurements proved the pH-sensitive behavior of the NF membrane.

关键词： polymer hydrogels intelligent membrane nanofiltration membrane charged membrane pH-sensitivity

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Magnetic poly(acrylic acid)-based hydrogels for rapid ammonium sorption and efficient sorbent separation from sewage

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Environmental Science and Ecotechnology 2021年第2期6卷 21-27页

作者： Heidy Cruz Miriam Yap Gabon Sirajus Salehin Thomas Seviour Bronwyn Laycock Ilje Pikaar School of Civil Engineering The University of QueenslandBrisbaneQueensland4072Australia School of Chemical Engineering The University of QueenslandBrisbaneQueensland4072Australia WATEC Aarhus University Centre for Water Technology Nørrebrogade 44Bldg 17838000AarhusDenmark Advanced Water Management Center The University of QueenslandBrisbaneQueensland4072Australia Department of Civil and Environmental Engineering National University of Singapore1 Engineering Drive 2Singapore117576Singapore

Ammonium sorption and recovery processes typically take place in conventional packed columns,with a configuration that enables maximum sorption by the ***,batch or semi-continuous operations in packed columns have associated issues such as scaling and frequent backwashing requirements,which are economically *** an alternative,ammonium sorption could occur in well-mixed continuously stirred tanks,which would allow for the ammonium sorption process to be retrofitted in existing wastewater treatment plants,provided that efficient sorbent separation can be *** study demonstrates,for the first time,the preparation of magnetic poly(acrylic acid)-based(PAA)ammonium sorbents through the incorporation of magnetic(Fe_(3)O_(4))nanoparticles(MNP)produced via scalable and cost-effective electrochemical *** MNP and PAA hydrogels were synthesized independently and the MNPs subsequently integrated into the PAA hydrogel network by particle diffusion and physical *** adverse effects on swelling and ammonium sorption following immersion in either synthetic or real sewage were observed after MNPs were incorporated into the ***,PAA-MNP hydrogels demonstrated high ammonium sorption efficiencies(80-93%)in real sewage and achieved rapid ammonium recovery of 73±1.1% within 15 min of mild acid washing(pH 4)15 min at a maximum recovery.

关键词： Sewage Wastewater treatment Resource recovery polymer hydrogels Ammonium recovery Magnetic nanoparticles

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