Destruction of microcystins (cyanotoxins) by UV-254 nm-based direct photolysis and advanced oxidation processes (AOPs): influence of variable amino acids on the degradation kinetics and reaction mechanisms

Water Research
Xuexiang HeDionysios D Dionysiou

Abstract

Hepatotoxic microcystins (MCs) are the most frequently detected group of cyanobacterial toxins. This study investigated the degradation of common MC variants in water, MC-LR, MC-RR, MC-YR and MC-LA, by UV-254 nm-based processes, UV only, UV/H2O2, UV/S2O8(2-) and UV/HSO5(-). Limited direct photolysis of MCs was observed, while the addition of an oxidant significantly improved the degradation efficiency with an order of UV/S2O8(2-) > UV/HSO5(-) > UV/H2O2 at the same initial molar concentration of the oxidant. The removal of MC-LR by UV/H2O2 appeared to be faster than another cyanotoxin, cylindrospermopsin, at either the same initial molar concentration or the same initial organic carbon concentration of the toxin. It suggested a faster reaction of MC-LR with hydroxyl radical, which was further supported by the determined second-order rate constant of MCs with hydroxyl radical. Both isomerization and photohydration byproducts were observed in UV only process for all four MCs; while in UV/H2O2, hydroxylation and diene-Adda double bond cleavage byproducts were detected. The presence of a tyrosine in the structure of MC-YR significantly promoted the formation of monohydroxylation byproduct m/z 1061; while the presence of a second arg...Continue Reading

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Citations

Jan 7, 2016·Environmental Science & Technology·Shuwen YanWeihua Song
Dec 1, 2015·Analytical Chemistry·Susan D Richardson, Susana Y Kimura
Jul 29, 2015·Journal of Hazardous Materials·Carlos J PestanaLinda A Lawton
Jun 25, 2016·Environmental Science & Technology·Xinran ZhangErnest R Blatchley Iii
Aug 16, 2016·Environmental Science and Pollution Research International·Theodoti PapadimitriouChrysi Laspidou
May 6, 2017·International Journal of Environmental Research and Public Health·Xuewen JiangJiyoung Lee
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Mar 18, 2016·Journal of Phycology·Piotr Rzymski, Barbara Poniedziałek
Jan 26, 2021·Water Research·Tyler KurtzFernando L Rosario-Ortiz
Aug 4, 2021·Environmental Science & Technology·Davide Vione, Fernando L Rosario-Ortiz
Jun 20, 2018·Environmental Science & Technology·Xiaodi DuanDionysios D Dionysiou

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