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Modification of morphological engineering to enhance photocatalytic activity has been considered an effective strategy. However, effective modification of the catalyst nanosheet thickness remains a difficult challenge to control. Here, we have synthesized Sn-TiO 2 /BiOBr composite photocatalysts by a onepot method. With the addition of Sn-TiO 2 , the flakes of BiOBr gradually became thinner, resulting in more surface reaction site, and Sn-TiO 2 clearly increased the adsorption capacity of the composite catalyst. The degradation efficiency of the prepared Sn-TiO 2 /BiOBr (the atomic ratio of titanium/bismuth 1:1) was 98% and 80% for TC-HCl and CIP, respectively, showing good photocatalytic performance. Furthermore, the radical trapping experiments revealed that h + and •O 2 − play an important role in the Sn-TiO 2 /BiOBr system. Photoelectrochemical tests and photoluminescence confirm that the thin sheets can significantly improve carrier migration efficiency in Sn-TiO 2 /BiOBr heterojunctions. Finally, the degradation mechanism of the Sn-TiO 2 /BiOBr system was elucidated using UV-DRs and Mott−Schottky curves. Experimental analysis shows that modulating the thickness of BiOBr nanosheets with Sn-TiO 2 can promote the exposure of surface reaction sites, can enhance their light adsorption ability and carrier mobility, and is a promising method for improving photocatalytic efficiency.

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A novel strategy for fabricating C3N4/TiO2 Z-scheme heterojunctions based on C3N4 isotype heterojunctions is presented. This scheme exploits the structural plasticity of C3N4 to achieve a breakthrough in activity without adding new materials.

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