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Water Permeates in Ceramic Membrane Modified with Nano Inorganic Coating

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Abstract:

Membrane surface modification is the important method to decrease membrane fouling. The hydrophilic modification of ceramic membrane with nano-sized inorganic coating is prepared by the wet chemical methods. The thin nano coating is not a separating top layer but distributes uniformly on the surface of the membrane pore wall. The coating does not change the structure of the membrane pores. Therefore, water flows on not the pore wall but the nano coating surface. The results show that the water flux of the modified membrane is higher than that of the unmodified membrane despite that the mean pore size of the modified membrane decreases. The “boundary slip” is used to explain this special phenomenon. What generates the slippage The slippage is relative with the molecular layer adhered tightly on the hydrophilic pore wall, the roughness and the surface charge of the nano coating, the interaction between the ions in water and the nano coating, et al.

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Advanced Materials, CEAM 2011 View Preview

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Periodical:

Advanced Materials Research (Volumes 239-242)

Pages:

27-30

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.239-242.27

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Online since:

May 2011

Authors:

Jian Er Zhou, Qi Bing Chang, Ying Chao Dong, Xue Bing Hu, Yong Qing Wang, Stuart Hanpshire

Keywords:

Membrane Modification, Nano Coating, Surface Charge, Water Permeation

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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