RRC ID 55531
著者 Negishi N, Sugasawa M, Miyazaki Y, Hirami Y, Koura S.
タイトル Effect of dissolved silica on photocatalytic water purification with a TiO2 ceramic catalyst.
ジャーナル Water Res
Abstract If photocatalytic water purification technologies will find practical applications, the impact of total dissolved solids in the source water on the activity of the photocatalyst must be evaluated. In this study, we evaluated the effects of SiO32- in water on a TiO2 ceramic photocatalyst; specifically, we determined the effects of SiO32- on the rate of photocatalytic degradation of formic acid (as a model contaminant) and on the rate of photocatalytic inactivation of Escherichia coli in an aqueous solution. Both the rate of formic acid degradation and the sterilization rate decreased with increasing SiO32- concentration. On the other hand, at a given SiO32- concentration, the activity of the photocatalyst did not decrease over the course of 120 h, and the surface structure of the photocatalyst did not change (i.e., no precipitate formed on the surface). The decreases in photocatalytic activity due to the presence of SiO32- could be recovered by flushing the experimental apparatus with distilled water. These results show that the reason for the lower photocatalytic activity in the presence of SiO32- than in its absence was due to adsorption of SiO32- onto the surface of the TiO2 photocatalyst and that SiO32- adsorption was an equilibrium process in water.
巻・号 150
ページ 40-46
公開日 2019-3-1
DOI 10.1016/j.watres.2018.11.047
PII S0043-1354(18)30976-X
PMID 30503873
MeSH Catalysis Ceramics Silicon Dioxide Titanium Water Purification*
IF 7.913
引用数 7
リソース情報
一般微生物 JCM 20135