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Inactivation of Microcystis aeruginosa by hydrogen-terminated porous Si wafer: Performance and mechanisms

Paper ID Volume ID Publish Year Pages File Format Full-Text
29876 44445 2016 7 PDF Available
Title
Inactivation of Microcystis aeruginosa by hydrogen-terminated porous Si wafer: Performance and mechanisms
Abstract

•A new method to inactivate Microcystis aeruginosa is put forward.•H-PSi wafer can efficiently remove Microcystis aeruginosa.•H-PSi wafer has a good reusability.•The oxidation mechanism of H-PSi wafer against M. aeruginosa was expounded.

We proposed a method to inactivate Microcystis aeruginosa by using hydrogen-terminated porous Si (H-PSi) wafer. The influences of oxidation time on the removal of M. aeruginosa were investigated. Samples oxidized by H-PSi wafer were subsequently grown under illuminated culture conditions. The results demonstrated that the optimal oxidation time was about 1 h, which could control the growth of M. aeruginosa about 65%, after 3 days culture. Simultaneously, extracellular microcystins was decreased from 14.65 to 7.06 μg L− 1 and remain relative integrity of M. aeruginosa cells which could avoid secretion of large amounts of organic material. Multiple analysis techniques including fluorescence excitation–emission matrix (EEM) and fluorescence microscope were used to reveal the inhibition mechanisms of M. aeruginosa. Meanwhile, analyses of reactive oxygen level, malondialdehyde content, and superoxide dismutase activity indicated that the damage and inactivate of M. aeruginosa cells are mainly due to accumulation of lipid peroxidation and inhibition of normal physiological metabolism by free radicals produced by H-PSi wafer under visible light irradiation. In conclusion, these results suggest that H-PSi wafer may be useful in controlling growth and survival of M. aeruginosa in many large lakes and reservoirs, thus mitigating many of the economic, esthetic ecological impacts of the invasive alga.

Keywords
H-PSi wafer; Free radical; Algal removal; Microcystis aeruginosa; Toxin release and degradation
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Inactivation of Microcystis aeruginosa by hydrogen-terminated porous Si wafer: Performance and mechanisms
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 158, May 2016, Pages 23–29
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us