Novel visible-NIR photocatalysts prepared via the hybridization of wide and small bandgap semiconductors involving silver indium diselenide (AgInSe₂) and titanium dioxide by thermal and microwave methods are presented. The process revealed the formation of new hybrid nanostructured materials with remarkably different properties than the parent semiconductors. New catalysts were characterized by various advanced analytical tools such as UV-visible diffuse reflectance, Raman spectroscopy, XRD, SEM, EDS, TEM, XPS, and BET. Changes in the optical properties in comparison to the parent compounds, namely, AgInSe₂ and TiO₂, resulted in a broad absorption band covering the entire UV-visible region, which confirmed successful coupling. The XRD pattern revealed the presence of diffraction peaks from both the parent semiconductors. TEM showed spherical morphology with the presence of small TiO₂ NPs on the surface of AgInSe₂ NPs. In situ-formed silver selenide can also generate useful AgInSe₂ in the hybridized form, which showed rather excellent photocatalytic performance. The so-prepared hybrid nanostructured materials were tested for photocatalytic activity against three organic dyes, namely, methylene blue (MB), methyl orange (MO), and rhodamine B (RhB). The photocatalytic degradation efficiency was 89% for AgInSe₂/Ag₂Se against MB, which was better than the parent semiconductors. AgInSe₂/TiO₂ showed almost no loss in the degradation efficiency even after reuse for five times, confirming its stability and effectiveness.

中文翻译：

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二氧化钛（TiO ₂）修饰的二硒化银铟（AgInSe ₂）：用于降解染料的新型纳米光催化剂†

提出了新型的可见光-NIR光催化剂，该催化剂是通过热和微波方法将涉及银铟二硒化物（AgInSe ₂）和二氧化钛的宽带隙和小型带隙半导体进行杂交而制备的。该过程揭示了新的杂化纳米结构材料的形成，其特性与母体半导体明显不同。新催化剂的特征在于各种先进的分析工具，例如紫外可见漫反射，拉曼光谱，XRD，SEM，EDS，TEM，XPS和BET。与母体化合物AgInSe ₂和TiO ₂相比，光学性质的变化产生了覆盖整个紫外可见区域的宽吸收带，这证实了成功的偶联。XRD图谱表明存在来自两个母体半导体的衍射峰。TEM显示球形形态与小的TiO存在_2周的NP AgInSe的表面上₂的NP。原位形成的硒化银还可以杂交形式生成有用的AgInSe ₂，表现出相当优异的光催化性能。测试了如此制备的杂化纳米结构材料对三种有机染料，即亚甲基蓝（MB），甲基橙（MO）和若丹明B（RhB）的光催化活性。AgInSe ₂ / Ag的光催化降解效率为89％₂ Se对MB，比母体半导体好。即使重复使用五次，AgInSe ₂ / TiO ₂的降解效率几乎没有损失，证实了其稳定性和有效性。