In this study, Bi2S3/g-C3N4 binary catalyst has been excellently prepared by a wet impregnation-calcination method to form Z-scheme heterojunction. The catalyst has been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS) and photoluminescence spectroscopy (PL). The physicochemical properties of the catalyst have been tested, such as crystal structure, morphology, optical properities, light absorption properties and luminescence properties. The results demonstrate that the photocatalytic activity is significantly increased when Bi2S3 with optimum weight percentage (5wt%) loaded into g-C3N4. Through photocatalytic degradation experiments, the optimal loading ratio, dosage and dye concentration of binary materials have been explored. At the same time, the effect of pH on the photocatalytic experiment under the optimal conditions is studied. Reactive blue 19 (RB19) is degraded by 97.77% in 2 h as the target pollutants. The trapping experiment further verified that ꞏO2 - is the main active species in photocatalytic degradation of RB19.

中文翻译：

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Bi2S3/g-C3N4的Z型异质结及其光催化效应

在本研究中，通过湿法浸渍-煅烧法良好地制备了Bi2S3/g-C3N4二元催化剂，形成Z型异质结。该催化剂已通过 X 射线衍射 (XRD)、透射电子显微镜 (TEM)、紫外-可见漫反射光谱 (UV-DRS) 和光致发光光谱 (PL) 进行了表征。对该催化剂的物理化学性质进行了测试，如晶体结构、形貌、光学性质、光吸收性质和发光性质。结果表明，当将最佳重量百分比（5wt%）的Bi2S3负载到g-C3N4中时，光催化活性显着提高。通过光催化降解实验，探索了二元材料的最佳负载比、用量和染料浓度。同时，研究了最佳条件下pH对光催化实验的影响。活性蓝19（RB19）作为目标污染物在2 h内降解97.77%。捕获实验进一步验证了ꞏO2-是光催化降解RB19的主要活性物种。