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Int. J. Environ. Res. Public Health 2015, 12(12), 15819-15833; doi:10.3390/ijerph121215023

An Environmentally Friendly Method for Testing Photocatalytic Inactivation of Cyanobacterial Propagation on a Hybrid Ag-TiO2 Photocatalyst under Solar Illumination

1
Kuang-Tien General Hospital, No. 117, Satien Road, Shalu District, Taichung 43303, Taiwan
2
Department of Safety, Health and Environmental Engineering, Hungkuang University, No. 1018 Sec. 6, Taiwan Boulevard, Shalu District, Taichung 43302, Taiwan
3
Department of Electronics and Communication Engineering, Peking University, No. 5, Zhuangyuan Road, Binhu District, Wuxi 214125, China
*
Author to whom correspondence should be addressed.
Academic Editors: Nicholas Frederick Gray and Panagiotis Karanis
Received: 3 October 2015 / Revised: 3 December 2015 / Accepted: 4 December 2015 / Published: 11 December 2015
(This article belongs to the Special Issue Water Microbial Pollution and Disinfection)
View Full-Text   |   Download PDF [2282 KB, uploaded 11 December 2015]   |  

Abstract

Cyanobacteria were inactivated under sunlight using mixed phase silver (Ag) and deposited titanium dioxide (TiO2) coated on the surface of diatomite (DM) as a hybrid photocatalyst (Ag-TiO2/DM). The endpoints of dose-response experiments were chlorophyll a, photosynthetic efficiency, and flow cytometry measurements. In vitro experiments revealed that axenic cultures of planktonic cyanobacteria lost their photosynthetic activity following photocatalyzed exposure to sunlight for more than 24 h. Nearly 92% of Microcystis aeruginosa cells lost their photosynthetic activity, and their cell morphology was severely damaged within 24 h of the reaction. Preliminary carbon-14 (14CO3−2) results suggest that the complete inactivation of cyanobacteria arises from damage to cell wall components (peroxidation). A small concomitant increase in cell wall disorder and a consequent decrease in cell wall functional groups increase the cell wall fluidity prior to cell lysis. A high dosage of Ag-TiO2/DM during photocatalysis increased the concentration of extracellular polymeric substances (EPSs) in the Microcystis aeruginosa suspension by up to approximately 260%. However, photocatalytic treatment had a small effect on the disinfection by-product (DBP) precursor, as revealed by only a slight increase in the formation of trihalomethanes (THMs) and haloacetic acids (HAAs). View Full-Text
Keywords: photocatalysis; silver; titanium dioxide; cyanobacteria; extracellular polymeric substances; disinfection by-products photocatalysis; silver; titanium dioxide; cyanobacteria; extracellular polymeric substances; disinfection by-products
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chang, S.-Y.; Huang, W.-J.; Lu, B.-R.; Fang, G.-C.; Chen, Y.; Chen, H.-L.; Chang, M.-C.; Hsu, C.-F. An Environmentally Friendly Method for Testing Photocatalytic Inactivation of Cyanobacterial Propagation on a Hybrid Ag-TiO2 Photocatalyst under Solar Illumination. Int. J. Environ. Res. Public Health 2015, 12, 15819-15833.

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