Abstract This work, simple wet chemical route has been adapted to prepare calcium titanate (CaTiO3) catalyst nanopowders. The nature of crystalline structural, morphological, optical and textural properties of the products was monitored through XRD, SEM, TEM, Raman, UV, PL and BET analysis. Orthorhombic crystalline phase with clear spherical are found in the XRD and TEM results. There is no trace in the impurity of the products, which denotes that product purity nature. The optical band gap energies (3.03–2.82 eV) and rapid generation electron-hole with presence of light was identified through UV and PL results. Mesoporous nature (34.2 nm) with huge surface area (97.5 m2/g) was identified through BET analysis. The photocatalytic results exposed that the 900 °C annealed CaTiO3 catalyst shows fabulous degradation efficiency (88%), high apparent constant (0.0578 min−1) and long term stability towards MO dye under visible light illumination. The improved photocatalytic activity of CaTiO3 is due to the narrowing the band gap energy and prevent the recombination process of electron-hole pairs. The improved mechanism of the proposed photocatalyst was also discussed in detail.

中文翻译：

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退火温度对溶胶凝胶法合成CaTiO3催化剂结构、光学和可见光光催化性能的影响

摘要 本工作采用简单的湿化学方法制备钛酸钙（CaTiO3）催化剂纳米粉体。通过 XRD、SEM、TEM、拉曼、UV、PL 和 BET 分析监测产品的晶体结构、形态、光学和纹理特性的性质。在 XRD 和 TEM 结果中发现具有清晰球形的正交晶相。产品中无杂质，说明产品纯度性质。通过 UV 和 PL 结果确定了光学带隙能量 (3.03-2.82 eV) 和在光存在下快速生成的电子空穴。通过 BET 分析确定了具有巨大表面积 (97.5 m2/g) 的介孔性质 (34.2 nm)。光催化结果表明，900°C 退火的 CaTiO3 催化剂显示出惊人的降解效率（88%），在可见光照射下，对 MO 染料的高表观常数 (0.0578 min-1) 和长期稳定性。CaTiO3 光催化活性的提高是由于带隙能量变窄并阻止了电子-空穴对的复合过程。还详细讨论了所提出的光催化剂的改进机制。