Abstract A calcium titanate/calcium hydroxide (CaTiO3/Ca(OH)2) composite photocatalyst with enhanced activity towards the degradation of organic dyes was synthesized by a simple and direct hydrothermal route through controlling the Ca/Ti molar ratio within the reaction slurry. The photocatalytic performances indicated that the sample generated by Ca/Ti = 4 exhibited the highest photocatalytic activity, which was even higher than that of commercial P25. The enhanced performance of this composite photocatalyst was attributed to the hierarchical concave cuboid structure with high crystallization and high specific surface area, which inhibits the recombination of photogenerated electron and hole pairs, as well as to the combination of CaTiO3 and Ca(OH)2 which provides OH− to form OH with strong oxidizing properties to promote the separation of photogenerated electron and hole pairs.

中文翻译：

---

Ca/Ti比对CaTiO3/Ca(OH)2复合光催化剂形貌控制及光催化活性的影响

摘要 通过控制反应浆液中的Ca/Ti摩尔比，通过简单直接的水热途径合成了一种具有增强降解有机染料活性的钛酸钙/氢氧化钙(CaTiO3/Ca(OH)2)复合光催化剂。光催化性能表明，Ca/Ti=4 生成的样品表现出最高的光催化活性，甚至高于商业 P25。这种复合光催化剂的性能增强归因于具有高结晶度和高比表面积的分级凹长方体结构，抑制了光生电子和空穴对的复合，