The degradation of carbamazepine (CBZ), a refractory contaminant frequently detected in different water sources, were studied with the combination of bismuth bismuth oxyhalides (BiOX, X = Cl, Br, I) + peroxide (H<sub>2</sub>O<sub>2</sub>, PMS, PS). The results showed that the combination of BiOBr + PMS exhibited better performance in the degradation of CBZ. It was found that CBZ degradation was primarily (67.3%) attributable to the attack by sulfate radical. Reaction parameters such as additional anions, HA concentration, solution pH, and water backgrounds on the degradation of CBZ were also investigated. The CBZ degradation by BiOX activated peroxide was caused by the attack of sulfate radicals, which was generated from the PMS with the help of Bi(III)−Bi(V)−Bi(III) redox cycle. Substitution of the hydroxyl groups and direct complexation with the Bi(III) on the surface of the catalyst particles were found to be involved in the decomposition of the PMS. Experiments on IC, EPR, XPS, and FT-IR further proved the mechanism. LC-MS was used to analyse the intermediates of CBZ in the degradation process and the possible degradation pathway of CBZ was proposed, which perfected the mechanism of CBZ degradation by BiOX activated peroxide.

Efficient degradation of carbamazepine in aqueous solution by bismuth oxybromide-activated peroxide oxidation

253rd National Meeting (2017)

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