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Use of ultrafiltration membranes for the separation of TiO2 photocatalysts in drinking water treatment

Cited 162 time in Web of Science Cited 186 time in Scopus
Authors
Lee, Soo-Ah; Choo, Kwang-Ho; Lee, Chung-Hak; Lee, Ho In; Hyeon, Taeghwan; Choi, Wonyong; Kwon, Heock-Hoi
Issue Date
2001-04
Citation
Industrial and Engineering Chemistry Research, Vol.40 No.7, pp.1712-1719
Abstract
This study investigated the ability of cross-flow ultrafiltration (UF), combined with photocatalytic reactions, to separate TiO2 photocatalysts from treated water in photocatalytic drinking water treatment. The effect of natural organic matter (i.e., humic acids) and cross-flow velocities on UF fluxes and organic removal was explored with and without UV irradiation in the photocatalytic reactor. The interaction between the two solutes in the system, humic acids and TiO2 photocatalysts, played a significant role in the formation of dense cake layers at the membrane surface, leading to a greater flux decline during ultrafiltration of TiO2 particles. According to visual observations of the used membranes and the estimation of back-transport velocities of the solutes, a substantial amount of TiO2 deposited on the membrane induces more humic acids to accumulate at the membrane through the adsorption of humic acids onto TiO2 particles. The humic-acid-laden TiO2 particles offered more than four times higher specific cake resistance with a substantially increased compressibility coefficient than TiO2 particles alone. The higher the cross-flow velocities, the greater the UV254 removal achieved. This was because the rise of cross-flow velocities contributed to the reduction of concentration polarization at the membrane surface, thereby resulting in a decrease of the driving force for humic acids to pass through the membrane. When photocatalytic reactions took place with UV illumination, UV254 removal efficiencies of the permeate were improved markedly, and also the permeate flux was kept at a constant level without any sign of fouling. Although humic acids were not completely mineralized by photocatalysis, the degradation of the humic acids helped to enhance the UF flux, as they were transformed to less adsorbable compounds.
ISSN
0888-5885
URI
http://hdl.handle.net/10371/166106
DOI
https://doi.org/10.1021/ie000738p
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Chemical Convergence for Energy and Environment (에너지환경 화학융합기술전공)Journal Papers (저널논문_에너지환경 화학융합기술전공)
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