Enhanced photocatalytic degradation of norfloxacin in aqueous Bi2WO6 dispersions containing nonionic surfactant under visible light irradiation

Journal of Hazardous Materials
Lin TangZhi Guo

Abstract

Photocatalytic degradation is an alternative method to remove pharmaceutical compounds in water, however it is hard to achieve efficient rate because of the poor solubility of pharmaceutical compounds in water. This study investigated the photodegradation of norfloxacin in a nonionic surfactant Triton-X100 (TX100)/Bi2WO6 dispersion under visible light irradiation (400-750nm). It was found that the degradation of poorly soluble NOF can be strongly enhanced with the addition of TX100. TX100 was adsorbed strongly on Bi2WO6 surface and accelerated NOF photodegradation at the critical micelle concentration (CMC=0.25mM). Higher TX100 concentration (>0.25mM) lowered the degradation rate. In the presence of TX100, the degradation rate reached the maximum value when the pH value was 8.06. FTIR analyses demonstrated that the adsorbed NOF on the catalyst was completely degraded after 2h irradiation. According to the intermediates identified by HPLC/MS/MS, three possible degradation pathways were proposed to include addition of hydroxyl radical to quinolone ring, elimination of piperazynilic ring in fluoroquinolone molecules, and replacement of F atoms on the aromatic ring by hydroxyl radicals.

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Citations

Oct 11, 2016·The Science of the Total Environment·Sindy D Jojoa-SierraRicardo A Torres-Palma
Dec 15, 2019·Environmental Science and Pollution Research International·Kazem GodiniJae-Kyu Yang
May 30, 2017·Bioprocess and Biosystems Engineering·Ruinan ZhaoYucheng Jiang
Aug 15, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Honghai XueXindong Wei
Aug 23, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Junjiao ZhangHong Li
Apr 14, 2017·Environmental Science and Pollution Research International·Anđelka TomaševićSlavica Gašić
Feb 3, 2021·Environmental Science and Pollution Research International·Yuancai LvMinghua Liu
Mar 19, 2019·Advances in Colloid and Interface Science·Hao-Peng FengJiang-Fang Yu
Dec 22, 2019·Journal of Hazardous Materials·Mohammad Chahkandi, Mahboobeh Zargazi
Aug 20, 2021·Journal of Colloid and Interface Science·Yue WangDa-Wei Li

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