Quartz Sand Filter Media with Special Wettability for Continuous and Efficient Oil/Water Separation and Dye Adsorption

For continuous and efficient oil/water separation and adsorption of dyes, coconut shell powder was grafted onto the surface of quartz sand by dip-coating method to make coconut shell powder-covered quartz sand filter media (CSQS) with superhydrophilic and underwater superoleophobic properties and su...

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Veröffentlicht in:Processes 2020-09, Vol.8 (9), p.1083
Hauptverfasser: Wei, Bigui, Luo, Xuying, Song, Xiaosan, Guo, Hanyue, Dai, Liang, Zhang, Hongwei, Wang, Gang
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container_issue 9
container_start_page 1083
container_title Processes
container_volume 8
creator Wei, Bigui
Luo, Xuying
Song, Xiaosan
Guo, Hanyue
Dai, Liang
Zhang, Hongwei
Wang, Gang
description For continuous and efficient oil/water separation and adsorption of dyes, coconut shell powder was grafted onto the surface of quartz sand by dip-coating method to make coconut shell powder-covered quartz sand filter media (CSQS) with superhydrophilic and underwater superoleophobic properties and superoleophilic and underoil highly hydrophobic properties. The contact angles of the underwater oil and underoil water with CSQS were more than 151.2° and 134.2°, respectively. A continuous oil/water separation device was designed. The separation device filled with CSQS can separate oil/water mixture (whether heavy or light oil) into water and oil at the same time with a separation efficiency of above 99.92%. The filter layer can be recovered through reverse extrusion even after lyophobic liquid penetrated the filter layer; hence, the separation efficiency of the filter layer was still above 99.99% for diesel and water mixture. Simultaneously, CSQS can effectively adsorb methylene blue with the highest removal rate as 98.94%. CSQS can maintain stable wettability under harsh environment conditions. This paper provides a new idea on continuous and efficient oil/water separation and simultaneous dye adsorption.
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute
subjects Adsorption
Contact angle
Dip coatings
Dyes
Efficiency
Extrusion
Hydrophobic surfaces
Hydrophobicity
Immersion coating
Membrane separation
Methylene blue
Oil
Oxidation
Quartz
Research methodology
Sand
Sand filters
Separation
Stainless steel
Underwater
Water purification
Wettability
title Quartz Sand Filter Media with Special Wettability for Continuous and Efficient Oil/Water Separation and Dye Adsorption
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