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Removal of triclosan in a Fenton-like system mediated by graphene oxide: Reaction kinetics and ecotoxicity evaluation

Peng, Jianbiao, Zhang, Yaozong, Zhang, Chaonan, Miao, Dong, Li, Jianhua, Liu, Haijin, Wang, Lianhong, Gao, Shixiang
The Science of the total environment 2019 v.673 pp. 726-733
Raman spectroscopy, X-ray photoelectron spectroscopy, activation energy, aqueous solutions, byproducts, chemical composition, ecotoxicology, graphene oxide, hydroxyl radicals, nanomaterials, oxidation, reaction kinetics, toxicity, transmission electron microscopy, triclosan
As a typical nanomaterial, graphene oxide (GO) can be easily dispersed in water and may affect the aqueous environment. In this paper, the degradation of triclosan (TCS) in a Fenton-like system Fe3+/H2O2 in GO aqueous solution was investigated. Interestingly, it was observed that GO at low concentration (2.0 mg/L) could exhibit significant catalytic effect on TCS removal. Meanwhile, results of XPS, Raman and TEM spectroscopy suggested the structure and chemical composition of GO did not exhibit significant change after the oxidation process within 30 min. As per the radical quenching experiments and ESR tests, hydroxyl radical (·OH) was mainly responsible for the decomposition of TCS. Further mechanism study indicated that the reaction activation energy (Ea) could be lowered and the production of ·OH be promoted in the presence of GO, respectively. A total of nine intermediates of TCS degradation were detected by TOF-LC-MS after SPE procedure. Finally, ecotoxicity assessment revealed that degradation of TCS by Fe3+/H2O2 system in GO aqueous solution could yield by-products of smaller toxicity compared with parent compounds.