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Abstract
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Employing a simple hydrothermal approach, Sn-doped BiOI microspheres were successfully synthesized and demonstrated superior photocatalytic performance under visible light. A detailed investigation revealed that Sn-doped BiOI exhibited significantly enhanced photocatalytic activity in comparison with bare BiOI. To understand the origins of the enhanced catalytic behavior, a series of characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy (PL), UV-Vis diffuse reflectance spectroscopy (DRS), and electrochemical measurements were performed. These analyses demonstrated that Sn doping substantially modified the microscopic structure, morphology, and optical properties of BiOI, thereby greatly improving its photocatalytic efficiency. Further analysis of Sn doping effects demonstrated significant enhancement in transport and separation of photocarriers within BiOI microspheres, thereby leading to substantially improved photocatalytic performance under visible light.
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