Photocatalytic inactivation of cyanobacteria with ZnO/γ-Al2O3 composite under solar light.
Loading...
Date
2011-05
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Cyanobacteria were inactivated by using zinc oxide (ZnO) coated on the surface of g-Al2O3 as a photocatalyst
and combining with sunlight. In vitro experiments indicate that axenic cultures of planktonic cyanobacteria lost
their photosynthetic activity after photocatalyzed with sunlight exposure exceeding 24 hr. As for Oscillatoria
tenuisa, nearly 92% of the cells lost their photosynthetic activity and the cell morphology was severely
damaged during 24 hr of the reaction. However, in the case of Microcystis aeruginosa, lower photocatalytic
inactivity efficiency was observed, which was attributed to extracellular polymeric secretions (EPSs) surrounding
the cells. With a high dosage ZnO catalyst, the dissolved organic carbon (DOC) concentration of the Oscillatoria
tenuisa suspension was increased by up to about 190% during photocatalysis. The increased suspension of
DOC was attributed to increase liberation of extracellular organic and cell-wall polysaccharides during
photocatalysis.
Description
Keywords
Cyanobacteria, Inactivation, Photocatalysis, ZnO film in γ-Al2O3
Citation
Huang Winn-Jung, Lin Tzu-Ping, Chen Jih-Sheng, Shih Fu-Hsiang. Photocatalytic inactivation of cyanobacteria with ZnO/γ-Al2O3 composite under solar light. Journal of Environmental Biology. 2011 May; 32(3): 301-307.