Fabrication of Superhydrophobic-superoleophilic Cotton Fabric and Its Application in Water-oil Separation†

doi:10.7503/cjcu20150278

Abstract

Abstract:

ZnO colloids were firstly prepared by sol-gel method, and then, cotton fabric with superhydrophobicity and superoleophilicity was fabricated by dipping-coating ZnO colloids and subsequently modifying the surface with octyltrimethoxysilane, contact angles of water and oil droplet on the surface was about 152° and 0°, respectively. The cotton fabric with superhydrophobicity and superoleophilicity can be applied to separate oil or water from water-oil mixtures with high efficiency. The research are expected to offer references for the design of waterproof clothing, fabrication of superhydrophobic-superoleophilic material and its application in the separation of oil-water mixtures.

Key words: Superhydrophobic, Superoleophilic, Cotton fabric, ZnO colloid, Oil-water separation

CLC Number:

O647.5

TrendMD:

SHI Yanlong, YANG Wu, FENG Xiaojuan. Fabrication of Superhydrophobic-superoleophilic Cotton Fabric and Its Application in Water-oil Separation^†[J]. Chem. J. Chinese Universities, 2015, 36(9): 1724.

Figures/Tables 5

Fig.1 SEM images of superhydrophobic/superoleophilic cotton fabric treated by dip-coating ZnO colloids and surface modification with OTS Dip-coating times: (A) 1; (B) 1; (C) 2; (D) 3; (E) 4; (F) 5. Insets are images of water droplets on cotton fabric.

Fig.2 Correlations of dip-coating times with contact angles(CA) on superhydrophilic and superhydrophobic cotton fabric before(b) and after(a) modification with OTS

Fig.3 XPS spectra of cotton fabric with superhydrophobicity(A) Full spectrum of ZnO colloids modified by OTS; (B)Si2p; (C) Zn2p.

Fig.4 Schematic diagram of fabrication and formation mechanism of cotton fabric with superhydrophobicity and superoleophilicity

Fig.5 Separation process of water-oil mixture executed by superhydrophobic and superoleophilic cotton fabricDiesel oil was dyed with Oil Red. (A) Simple device for oil-water separation; (B) oil-water mixtures in cylinder before

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