Photocatalytic degradation of microcystin-LR by modified high-energy {001} titanium dioxide: Kinetics and mechanism study of HF8

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Wu , L , Pflugmacher , S , Yang , A & Esterhuizen-Londt , M 2018 , ' Photocatalytic degradation of microcystin-LR by modified high-energy {001} titanium dioxide: Kinetics and mechanism study of HF8 ' , SDRP Journal of Earth Sciences & Environmental Studies , vol. 3 , no. 2 , pp. 1-9 . https://doi.org/10.25177/JESES.3.2.4

Title: Photocatalytic degradation of microcystin-LR by modified high-energy {001} titanium dioxide: Kinetics and mechanism study of HF8
Author: Wu, Laiyan; Pflugmacher, Stephan; Yang, Anping; Esterhuizen-Londt, Maranda
Other contributor: University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
University of Helsinki, Ecosystems and Environment Research Programme



Date: 2018-09
Language: eng
Number of pages: 9
Belongs to series: SDRP Journal of Earth Sciences & Environmental Studies
ISSN: 2472-6397
DOI: https://doi.org/10.25177/JESES.3.2.4
URI: http://hdl.handle.net/10138/296511
Abstract: Background: Uniquely synthesised titanium dioxide (TiO2) with high-energy {001} exposed facets denoted HF8 was used for the photocatalytic degradation of microcystin-LR (MC-LR) under ultraviolet irradiation at 365 nm. Methods: The influence of various conditions including environmental pH, nutrient anions, TiO2 dose, and MC-LR concentration was studied, and concentration of MC-LR measured using liquid chromatography-tandem mass spectrometry. Results: Within 120 min, 72.6% of an environmentally relevant MC-LR concentration (120 µg/L) was degraded under pH conditions ranging from 3 to 11. Stability tests revealed no loss of TiO2 activity after four applications of the same dose, indicating its stability, reusability, and potential to be re-used for sustainable remediation of MC-LR in eutrophic waters. Mechanism studies suggested that the reaction obeyed the pseudo-first-order equation and that hydroxyl radicals are the major reactive intermediate contributing to the reaction. The structure elucidation of intermediates suggested that hydroxylation and bond cleavage between the Adda chain and Mdha site could be the initiation of reactions in the degradation of MC-LR by HF8 TiO2. Conclusion: The results present a fast, sustainable, and practical method using modified TiO2 to improve MC-LR remediation.
Subject: 116 Chemical sciences
photocatalysis
titanium dioxide
1181 Ecology, evolutionary biology
Microcystin
degradation
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