Facile synthesis of novel rGO-supported AgI decorated TiO2mesocrystals (AgI-TMCs-rGO) and their photocatalytic activity under visible light irradiation are reported. The catalysts were prepared by combining hydrothermal reaction process andin situdeposition-precipitation method. The structural features and chemical compositions of the prepared catalysts were investigated by HRTEM (high resolution transmission electron microscopy), XRD (X-ray powder diffraction), Raman spectra, XPS (X-ray photoelectron spectroscopy), UV-vis DRS (UV-vis diffuse reflectance spectra), PLS (photoluminescence spectra), and N2physisorption measurements. The AgI-TMCs-rGO catalysts featured large surface area, high adsorption capacity, enhanced photo-induced charge separation and strong absorbance of visible light. The intimate contact of various components and fast transfer of charge carriers can effectively suppress photolysis of AgI and do favor to structural stability of AgI-TMCs-rGO. The photocatalytic activity of the catalysts was evaluated by degrading Rhodamine B (RhB) in aqueous solution under visible light irradiation. Highest photocatalytic activity was observed in the sample 20%Ag-TMCs-rGO, attributed to the synergistic effects of lower band gap and charge carriers' recombination rate along with the higher surface area of the fabricated sample.

中文翻译：

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rGO负载AgI-TiO ₂介晶的合成具有增强的可见光光催化活性

报道了新型 rGO 支持的 AgI 装饰的 TiO2 介晶 (AgI-TMCs-rGO) 的简便合成及其在可见光照射下的光催化活性。该催化剂采用水热反应法和原位沉淀法相结合的方法制备。通过HRTEM（高分辨透射电子显微镜）、XRD（X射线粉末衍射）、拉曼光谱、XPS（X射线光电子能谱）、UV-vis DRS（UV-可见漫反射光谱）、PLS（光致发光光谱）和 N2 物理吸附测量。AgI-TMCs-rGO催化剂具有表面积大、吸附容量高、光致电荷分离能力强、可见光吸收强等特点。各种组分的紧密接触和电荷载流子的快速转移可以有效抑制 AgI 的光解，有利于 AgI-TMCs-rGO 的结构稳定性。通过在可见光照射下降解水溶液中的罗丹明 B (RhB) 来评估催化剂的光催化活性。在样品 20% Ag-TMCs-rGO 中观察到最高的光催化活性，这归因于较低带隙和电荷载流子复合率以及制造样品的较高表面积的协同效应。