Reaction of methylene blue with OH radicals in the aqueous environment: mechanism, kinetics, products and risk assessment.

Environmental lifetimes The attribute of environmental persistence of a compound is highly significant for its environmental safety as a lack of breakdown processes means a compound retains its toxicity allowing its transportation to distant regions. 72 In the presence of HO ̇ radicals in water at a temperature range of 273–373 K, with environmentally relevant pH values (pH > 2.0, MB > 99%), and with [HO ̇] = 10 −18 to 10 −15 M in natural water 25–27 and 10 −10 to 10 −9 M in AOP-treated wastewater, 76 the lifetime of MB was calculated ( Fig. 4 and Table S2, ESI † ).

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