Inactivation of Bacteria by Kaolinite Photocatalysts in Water

Autor:	Shu-Lung Kuo, Chiu-Jung Liao
Rok vydání:	2008
Předmět:	inorganic chemicals biology Chemistry organic chemicals Inorganic chemistry biology.organism_classification Pollution Ion Catalysis Excited state Photocatalysis Valence band Environmental Chemistry Kaolinite heterocyclic compounds Irradiation Waste Management and Disposal Bacteria
Zdroj:	Environmental Engineering Science. 25:33-42
ISSN:	1557-9018 1092-8758
Popis:	Photocatalytic inactivation is mainly aimed at bacteria in surface water. Kaolinite is made to become the photocatalyst that has the inactivating capability with Ag+, Zn2+, and Ti4+ions. When the kaolinite catalyst is irradiated by a sodium lamp, it produces photocatalytic action to destroy bacteria. The photocatalytic inactivating result shows that kaolinite-Ti catalyst has 100% inactivation efficiency in 150 min, while the inactivation efficiency of kaolinite-Zn catalyst is more than 85% in 200 min. Photocatalytic inactivation of bacteria occurs because when kaolinite catalysts are irradiated by a sodium lamp, catalysts are excited to carry on photocatalytic reaction; irradiation of catalysts with photons of energy equal to or greater than its band-gap results in the promotion of electrons from the valence band to the conduction band of the catalyst particles. This study also compares the inactivation efficiency on bacteria. The result shows that kaolinite-Ti has the best inactivation efficiency, while ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::51eebc3845d9821e8b19bfa162fff583 https://doi.org/10.1089/ees.2006.0213 Zobrazit plný text záznamu