Cu<sub>2</sub>O@ZnO复合光催化剂对难生物降解有机物的光降解

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Abstract

Cu₂O@ZnO composite photocatalyst was successfully prepared by improved impregnation-reduction-air oxidation method, and the photocatalytic activity and degradation mechanism of the Cu₂O@ZnO was investigated by the degradation of two different chemical pollutants (p-nitrophenol (PNP) and polyacrylamide (PAM)). Cu₂O@ZnO composite photocatalyst expressed the best photocatalytic degradation performance under the simulated sunlight when the molar ratio of copper to zinc was 0.15, the photocatalytic degradation rates of p-nitrophenol and polyacrylamide arrived at 98.2% and 99.7%, respectively. The results of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy (PL), ultraviolet-visible (UV-Vis) absorption spectroscopy and so on showed that Cu₂O and ZnO formed type Ⅱ heterojunction, then the recombination of photogenerated electron hole pairs was inhibited effectively. Superoxide radicals and holes were the main active species by free radical trapping experiments, and the photocatalyst still expressed high photocatalytic activity after four cycles of reaction.

Key words： Cu₂O@ZnO photocatalysis heterojunction p-nitrophenol polyacrylamide

Received: 17 December 2018

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X52

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