Multifunctional Zinc Oxide-coated Mesh for Oil/Water Separation and Pollutant Degradation†

doi:10.7503/cjcu20130596

Abstract

Abstract:

With an operation of low-temperature hydrothermal treatment, a steel mesh was coated with hexagon-shaped nanorods of zinc oxide. The as-prepared mesh shows good wettability of underwater superoleophobicity to the droplet of 1,2-dichloroethane, making it possible for the use in oil/water separation. Mixture of water with various kinds of oil such as gasoline, diesel and petroleum ether can be separated rapidly with a high separation efficiency of 98%.The mesh could suffer an oil pressure of 1.4 kPa, with the oil thickness of 21 cm. Depending on the UV-response property of zinc oxide, the mesh can also be used in the degradation of methylene blue, which makes it a multifunctional material for water treatment.

Key words: Zinc oxide, Oil/water separation, Photo-degradation, Oleophobicity in water

CLC Number:

O644

TrendMD:

LU Fei, CHEN Yuning, LIU Na, CAO Yingze, FENG Lin. Multifunctional Zinc Oxide-coated Mesh for Oil/Water Separation and Pollutant Degradation^†[J]. Chem. J. Chinese Universities, 2014, 35(2): 368.

Figures/Tables 6

Fig.1 SEM images of the mesh coated with zinc oxide nanorods(A) and the magnified image of the framed area in (A)(B)

Fig.2 Contact angle images of zinc oxide-coated mesh(A) Water droplet in air; (B) 1,2-dichloroethane droplet in water.

Fig.3 Separation process of water/crude oil mixture(A) During separation; (B) after separation.

Fig.4 Separation efficiency of different kinds of oila. Petro-ether; b. hexane; c. gasoline;d. diesel; e. crude oil.

Fig.5 As-prepared mesh’s capacity for holding oil(A) Oil height(20 cm) with no permeation; (B) oil height(21 cm) with begining permeation through mesh; (C) oil height vs. number of separation.

Fig.6 Degradation efficiency-time curve of methylene blue

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