Rodlike AgI/Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> Heterojunctions\nwith Enhanced Visible-Light-Driven Photocatalytic\nActivity
Zhongyi Jiao (6653669)Zhendong Liu (1235259)Zhen Ma (281909)
Abstract
Novel\nAgI/Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> heterojunctions\nwere prepared by reacting Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> microrods with an aqueous KI solution at room temperature. The composite\nmaterials, compared with neat AgI and Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub>, showed much higher activities in the photocatalytic\ndegradation of aqueous rhodamine B, methyl orange, tetracycline hydrochloride,\nand levofloxacin solutions under visible-light irradiation. The structures,\nmorphologies, and other physicochemical properties of AgI, Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub>, and AgI/Ag<sub>2</sub>Mo<sub>2</sub>O<sub>7</sub> composites were studied via various characterization\ntechniques. The active species involved in the photocatalytic process\nwere examined via radical-capturing experiments and electron spin\nresonance. Superoxide anion radicals (<sup>•</sup>O<sub>2</sub><sup>–</sup>) and photogenerated holes (h<sup>+</sup>) were\nfound to be the main active species. Photocatalytic mechanisms were\nproposed and reasons for the enhanced photocatalytic activity were\nexplained.
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