TiO 2 Photocatalytic Degradation of Diclofenac: Intermediates and Total Reaction Mechanism
作者： Edgar Moctezuma , Elisa Leyva , Carmen Lara-Pérez , Saúl Noriega , Antonio Martínez-Richa
DOI: 10.1007/S11244-020-01262-7
关键词:
摘要: Diclofenac (DCF) photocatalytic degradation with TiO2-P25 illuminated UV-A light in aqueous media was investigated. The photodegradation rate assessed by HPLC and UV–vis spectroscopy, while the mineralization obtained total organic carbon measurements. formation of intermediate compounds were investigated UV–vis, IR 1H NMR spectroscopy GC/MS analysis. absorbance results indicated that DCF is completely transformed into some aromatic after several hours irradiation. TOC analysis are degraded slowly since 90% achieved FT-IR studies demonstrated a rapid conversion diclofenac lactam, which converted compounds. initial photoproducts two lactams anilines phenols. degrades rather simple mechanism generating recalcitrant acid, namely 2-hydrophenyl acetic acid oxidized steps hydroxyl radicals. also an oxidation route via quinone actually very minor pathway. Based on this previous investigations, for presented, first involving radical reactions to generate phenols, all polyhydroxylated eventually low molecular saturated unsaturated amines carboxylic acids. Basic about required future applications process removal other structurally related pharmaceutical from any water body.
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