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- Title
Microcystin-LR degradation by hydrogen-terminated porous Si under visible light irradiation.
- Authors
Hangzhou Xu; Haiyan Pei; Hongdi Xiao; Wenrong Hu; Dezhong Cao
- Abstract
Microcystin-LR (MC-LR) produced by freshwater cyanobacteria is commonly detected in contaminated aquatic systems and their removal becomes an emerging field recently owing to the toxicity. In this paper, hydrogen-terminated porous Si (H-PSi) wafers, fabricated through a photo-electrochemical etching, were investigated as photocatalysts in MC-LR photodegradation systematically under visible light irradiation. Photoluminescence (PL) spectra and scanning electron microscope (SEM) images reveal that surface area and visible light availability of the etched samples increase with the etching times increasing, inducing that the degradation efficiency of MC-LR increases with prolonging the etching times. This degradation process can be well fitted with the pseudo-first-order kinetic model. To evaluate the optimum conditions of degradation, the relationship between the degradation efficiency of MC-LR and pH value, MC-LR concentration, or etching time is performed. We demonstrate that the maximum MC-LR degradation rate of 99% can be obtained within 2 h reaction under etching time of 10 min, initial pH of 5, and initial MC-LR concentration of 20 μg L–1. In addition, it was found that H-PSi wafer exhibits a good reusability and the removal rate could be about 80% after 6 times cycle.
- Subjects
VISIBLE spectra; MICROCYSTINS; PHOTOELECTROCHEMICAL etching; SCANNING electron microscopes; IRRADIATION
- Publication
Desalination & Water Treatment, 2017, Vol 59, p280
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2016.1675