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首页> 外文期刊>Journal of King Saud University >Preparation and characterization of novel CuBi2O4/SnO2 p–n heterojunction with enhanced photocatalytic performance under UVA light irradiation
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Preparation and characterization of novel CuBi2O4/SnO2 p–n heterojunction with enhanced photocatalytic performance under UVA light irradiation

机译：新型CuBi 2 O 4 / SnO 2 p–n异质结在UVA光照射下具有增强的光催化性能

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摘要

A novel p-CuBi 2 O 4 -SnO 2 heterostructure photocatalyst with different mass ratios was synthesized by the solid state technique, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–Vis diffuse reflectance spectroscopy (DRS). The photocatalytic activities of p-CuBi 2 O 4 -SnO 2 photocatalysts were assessed based on the photodegradation of Congo red (CR) dye as a probe reaction under UVA (365 nm) light irradiation. Experimental results showed that the phase composition, surface morphology of particles, and optical absorption of the sample were found to vary significantly with the mass ratios and pH medium. The p-CuBi 2 O 4 -SnO 2 photocatalyst exhibited higher photocatalytic performance as compared with CuBi 2 O 4 and SnO 2 . The photodegradation reactions were satisfactory correlated with the pseudo-first-order kinetic model. The optimum amount of doped CuBi 2 O 4 was 5 wt% as a result of 58.06% of photoactivity of CR within 100 min under UVA light at pH = 8 and 25 °C, which is about 2 times higher than that of pure SnO 2 . On the basis of the calculated energy band positions and the active species during photocatalytic process, the mechanism of the enhanced photocatalytic activity was discussed by solid state z-scheme photocatalysis system.
机译：采用固态技术合成了质量比不同的新型p-CuBi 2 O 4 / n-SnO 2异质结构光催化剂，并通过X射线衍射（XRD），扫描电子显微镜（SEM）和UV-Vis漫反射特性进行了表征。光谱（DRS）。基于刚果红（CR）染料在UVA（365 nm）光照下的探针反应，对p-CuBi 2 O 4 / n-SnO 2光催化剂的光催化活性进行了评估。实验结果表明，样品的相组成，颗粒的表面形态和光吸收率随质量比和pH介质的变化而显着变化。与CuBi 2 O 4和SnO 2相比，p-CuBi 2 O 4 / n-SnO 2光催化剂表现出更高的光催化性能。光降解反应与拟一级动力学模型令人满意。最佳的CuBi 2 O 4掺杂量为5 wt％，这是因为在pH = 8和25°C的UVA光照下100分钟内CR的光活性为58.06％，这是纯SnO 2的2倍左右。根据计算得到的能带位置和光催化过程中的活性种类，利用固态z-方案光催化系统探讨了增强光催化活性的机理。

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