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TiO2 as a photocatalyst for control of the aquatic invasive alga, Cladophora, under natural and artificial light

Journal of Photochemistry and Photobiology A: Chemistry

By:
, , , , , and
DOI: 10.1016/j.jphotochem.2006.08.009

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Abstract

Cladophora, a nuisance and invasive, filamentous algae (Chlorophyta), massively accumulates along the shores of the lower Great Lakes each summer causing great economic damage and compromising recreational opportunity and perhaps public health. In vitro experiments showed that Cladophora samples were physically and biologically degraded when subjected to TiO2-mediated photocatalysis. For the most successful photocatalytic process, TiO2 was immobilized on a glass surface and used in combination with either sunlight or artificial UV light. The loss of vital algal pigments was monitored using UV-vis spectrophotometry, and cell structural changes were determined by microscopic observation. Cladophora, in the presence of TiO2-covered glass beads, experienced a loss of chloroplast pigments after 2 h of UV lamp light irradiation. In a separate experiment, sunlight exposure over 4 days (???24 h) resulted in the complete oxidative degradation of the green chloroplast pigments, verified by the UV spectra of the algal extracts. These results suggest that TiO2, mobilized on sunlit silicates may be useful in controlling growth and survival of this alga in the Great Lakes, thus mitigating many of the economic, aesthetic ecological impacts of this invasive alga. ?? 2006 Elsevier B.V. All rights reserved.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
TiO2 as a photocatalyst for control of the aquatic invasive alga, Cladophora, under natural and artificial light
Series title:
Journal of Photochemistry and Photobiology A: Chemistry
DOI:
10.1016/j.jphotochem.2006.08.009
Volume
186
Issue:
2-3
Year Published:
2007
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Photochemistry and Photobiology A: Chemistry
First page:
212
Last page:
217