Recently perovskites-based inorganic compounds have been researched incredibly for their photocatalytic applications. In this work, rubidium tin chloride [Rb₂SnCl₆] and caesium-incorporated rubidium [(Rb_XCs_1-X)₂SnCl₆]-defect perovskites were synthesized for photocatalytic applications. This material is very useful for the degradation of dyes under UV irradiation among other photocatalysts, because of its superior properties such as nontoxicity, low cost, simple preparation methods and long-term thermal stability. The crystal structure, morphology and elemental composition of synthesized defect perovskite materials have been analysed using XRD, FESEM and EDAX mapping analysis. The UV studies reveal that the band-gap values were tuned (from 2.71 eV in Rb₂SnCl₆ to 3.78 eV in (Rb_0.5Cs_0.5)₂SnCl₆), resulting in a blue shift of the PL emission peak (from 458 to 328 nm) due to the incorporation of caesium in rubidium site. The thermal stability of (Rb_0.5Cs_0.5)₂SnCl₆ is enhanced over other synthesized defect perovskite materials because 76% of samples remained at the highest temperature of 750 °C. Synthesized defect perovskite materials were used in the photocatalytic degradation of methylene blue dye under UV light radiation. Furthermore, an excellent photocatalytic degradation is observed for (Rb_0.5Cs_0.5)₂SnCl₆ (78% to 85%) compared to other defect perovskite materials even after 120 min irradiation. The increase in photocatalytic efficiency of (Rb_0.5Cs_0.5)₂SnCl₆ is due to strong absorption of light, large separation of electron–holes pairs and the size of the nanoparticles. Also, the radical trapping experiment showed that the super oxide radicals (^.O₂⁻) and photo-generated holes (h⁺) were the predominant active species in the photocatalytic degradation of methylene blue dye process. This study concludes that the defect perovskites are the potential materials for photocatalytic application.

最近，基于钙钛矿的无机化合物因其光催化应用而得到了令人难以置信的研究。在这项工作中，铷氯化锡 [Rb ₂ SnCl ₆ ] 和掺铯铷 [(Rb _X Cs _1-X ) ₂ SnCl ₆]-缺陷钙钛矿被合成用于光催化应用。该材料具有无毒、低成本、制备方法简单和长期热稳定性等优异特性，在紫外光照射下降解染料等光催化剂非常有用。已使用 XRD、FESEM 和 EDAX 映射分析分析了合成缺陷钙钛矿材料的晶体结构、形貌和元素组成。UV 研究表明带隙值已调整（从 Rb ₂ SnCl _{6 中的}2.71 eV到 (Rb _0.5 Cs _0.5 ) ₂ SnCl _{6 中的}3.78 eV)，由于在铷位点掺入铯，导致 PL 发射峰蓝移（从 458 到 328 nm）。(Rb _0.5 Cs _0.5 ) ₂ SnCl ₆的热稳定性优于其他合成缺陷钙钛矿材料，因为 76% 的样品保持在 750 °C 的最高温度。合成的缺陷钙钛矿材料用于在紫外光辐射下光催化降解亚甲基蓝染料。此外，对于 (Rb _0.5 Cs _0.5 ) ₂ SnCl ₆观察到优异的光催化降解与其他缺陷钙钛矿材料相比，即使在 120 分钟照射后（78% 至 85%）。(Rb _0.5 Cs _0.5 ) ₂ SnCl ₆光催化效率的提高是由于光的强吸收、电子-空穴对的大分离和纳米颗粒的尺寸。此外，自由基捕获实验表明，超氧化物自由基（^. O ₂ ^-）和光生空穴（h ⁺）是亚甲基蓝染料光催化降解过程中的主要活性物质。该研究得出结论，缺陷钙钛矿是光催化应用的潜在材料。