One stone three birds: Simultaneous detection, adsorption and photocatalysis, the novel coordinated treating strategy towards complicated pollution system and the mechanism analysis

摘要

Waste water is difficult to treat, mainly because of the co-existence of organic and inorganic contaminants, attracting much attention. Herein, a novel nanohybrid of TiO2/dicarboxylate 1,5-diphenyl-3-thiocarbazone(III) (denoted as TiO2/DAT) was facilely synthesized. TiO2/DAT was used to treat the waste water with the co-existence of tetracycline (TC) and Cd2+. The results indicated that TiO2/DAT can qualitatively/quantitatively detect Cd2+ via colorimetry, and the Cd2+ adsorption can boost the TC degradation by TiO2/DAT. It was found that the co-existence of TC does not affect the detection and adsorption of Cd2+. Furthermore, whether Cd2+ being adsorbed in advance or co-existent with TC, the TC degradation manners over TiO2/DAT were similar. A reasonable deduction for these phenomena is that Cd2+ was adsorbed by TiO2/DAT before TC, which was confirmed by density functional theory (DFT) calculations. So TC and Cd2+ will not compete the surface active sites of TiO2/DAT when treated simultaneously by TiO2/DAT, and that is why TiO2/DAT can effectively treat TC and Cd2+ co-existent waste water. Upon TiO2/DAT, the treating strategies of detection, adsorption and degra-dation are combined into one functional material. This one stone three birds strategy can simplify the treating process of complex pollution systems, exhibiting highly promising in practical applications.

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