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摘要
The p-type semiconductor red phosphorus (HRP) and the n-type semiconductor ZnO are combined to form a p-n type heterojunction composite semiconductor catalyst ZnO/HRP. Cr(Ⅵ) is selected as a model pollutant to investigate the effect of ZnO content on the photocatalytic reduction performance of the catalyst. It is found that the photocatalytic reduction speed of ZnO/HRP composite photo catalyst is enhanced with the increase of ZnO mass fraction in the catalyst, and decreases after reaching the highest value. When the mass fraction of ZnO is 0.25%, ZnO0.25/HRP composite photo catalyst exhibits the strongest photocatalytic reduction activity. Its reduction rate can achieve 5.5×10-2 min-1, 14.8 times that of HRP. It is found through studying the photocatalytic mechanism that a heterojunction formed by ZnO and HRP can inhibit the recombination of photogenerated electrons and holes, and enhance the light responsiveness, thus improving the photocatalytic activity of HRP. ? 2020, China National Chemical Information Center. All right reserved.
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