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    Robust, fluorine-free and superhydrophobic composite melamine sponge modified with dual silanized SiO2 microspheres for oil-water separation

    Year: 2021

    Journal: Chin. J. Chem. Eng., Volume 33, MAY, page 50–60

    Authors: Zhang, Ruilong; Zhou, Zhiping; Ge, Wenna; Lu, Yi; Liu, Tianshu; Yang, Wenming; Dai, Jiangdong

    Organizations: National Natural Science Foundation of China [21676127]; Natural Science Foundation of Jiangsu Province [BK20170532]; China Postdoctoral Science Foundation [2017M620194]; Jiangsu Planned Projects for Postdoctoral Research Funds [1701023A]; Natural Science Foundation Jiangsu Higher Education Institutions [17KJB430011]; Postgraduate Research& Practice Innovation Program of Jiangsu Province [KYCX19_1592]; Zhenjiang Natural Science Foundation of China [SH2017046, SH2017055]

    Keywords: Superhydrophobic sponge; Two-step sol-gel method; Oil-water separation; Dual silanized SiO2 microspheres

    Massive oily wastewater discharged from industrial production and human daily life have been an urgent environmental and ecological challenge. Superhydrophobic materials have attracted tremendous attention due to their unique properties and potential applications in the treatment of wastewater. In this study, a novel superhydrophobic/superoleophilic composite melamine sponge modified with dual silanized SiO2 microspheres was fabricated simply by a two-step sol-gel method using vinyltriethoxysilane and hexadecyltrimethoxysilane as functional agent, which exhibited a water contact angle of 1532 degrees and a water sliding contact angle of 4.8 degrees. Furthermore, the composite sponge showed the excellent oil adsorption performance and the compressive elasticity reaching up to 130 g.g(-1) of dichloromethane and 33.1 kPa of compressive stress. It was worth noting that the composite sponge presented the excellent separation efficiency (up to 99.5%) in the processes of continuous oil/water separation. The robust superhydrophobic composite melamine sponge provided the possibility with the practical application for oil-water separation. (C) 2020 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.
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