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    Study on the application of waste bricks in emulsified oil-water separation

    Year: 2020

    Journal: J. Clean Prod., Volume 251, APR 1

    Authors: Li, Zhangdi; Wu, Jieyi; Yue, Xuejie; Qiu, Fengxian; Yang, Dongya; Zhang, Tao

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21706100, 21878132]; Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRR F18003]; Natural Science Foundation of Hebei ProvinceNatural Science Foundation of Hebei Province [B2019108017]; Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX19_1158, SJKY19_25 77, SJKY19_2525]; Youth Talent Cultivation Programof Jiangsu University

    Keywords: Waste bricks; Special-wettability; Emulsions separation; Resource utilization; Trash to treasure

    Non-biodegradable waste brick (WB), as a major type of construction waste, is posing disastrous threat to our ecological environment and society. The effective treatment of WB is being demanded urgently, but it is very challenging to cost-effectively recycle WB. Herein, we presented a green resource utilization of WB turned into waste brick grain (WBG) layer by simple physical refining process. Specially, as-obtained WBGs with 100-400 mu m possess super-amphiphilicity and under-liquid special-wettability of approximate underwater superoleophobicity and underoil high-hydrophobicity. Notably, the accumulated WBG layer can be used for separating water-in-oil emulsions (WOE) and oil-in-water emulsions (OWE) only driven by gravity, even though interspaces between WBGs are larger than size of emulsified droplets, exhibiting high separation efficiency and higher filtrate flux than traditional membranes based on "sizesieving" mechanism. Besides, the WBG layer exhibits excellent chemical durability and cycling performance. Therefore, the low-cost WBG layer is anticipated to be an ideal candidate for high-efficient separation of emulsions in large-scale and harsh practical application. This work not only offers a new perspective for resource utilization of WB from construction waste, but also presents a promising material for emulsions separation, showing great potential and value in environmental protection and industrial applications. (C) 2019 Elsevier Ltd. All rights reserved.
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