Bismuth oxyhalide BiOX (X=Cl, Br, I) as a new photocatalyst, its series of BiOX, and composite photocatalyst materials have attracted much attention. In this paper, we used Bi(NO3)(3).5H(2)O, NaOH, and WS2 as raw materials to prepare WS2/BiOCl heterojunction composite materials by in situ construction method, and using X-ray diffraction, EDS element mapping, and other analytical means found the crystallization of WS2/BiOCl composite materials. With the increase of the mass ratio of WS2, the XRD peak of WS2 in the composite became sharp gradually. The visible light response range of BiOCl increased, and the band gap became narrow. The recombination probability of photogenerated electron-hole pair decreased. BiOCl (1-2 mu m) was stacked on the WS2 (2-5 mu m) layer, and formed the WS2/BiOCl heterostructure. The results showed that 7%-WS2/BiOCl had the best adsorption effect, and the degradation efficiency reached 95.83% at 240 min. At the same time, the active groups in the photocatalytic degradation process are .OH and h(+). Through the first-order kinetic simulation, the reaction rate constant of 7%-WS2/BiOCl was 0.0155 min(-1), which was 4.2 times that of BiOCl. After four cycles of experiments, it still had stable photocatalytic activity.
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