This work presented the preparation and characterization of TiO₂/termite hill soil (TiO₂-THS) and its photocatalytic application for cationic dye (methylene blue, MB) degradation in an aqueous solution. The TiO₂-THS was prepared using the impregnation method. The material properties were characterized using techniques such as gas sorption, SEM, FTIR, XRF and XRD. Optimization of photocatalytic degradation of MB under visible light irradiation was carried out using Taguchi design approach. The effects of parameters affecting the photocatalytic degradation process, pH, initial concentration, irradiation time and photocatalyst loading, were examined. It was identified that the optimum values of the concentration, pH, time and photocatalyst loading were 50 mg/L, 6.0, 90 min and 0.5 g/L, respectively. At these optimum conditions, the predicted and experimental decolorization efficiencies were 96.31% and 95.76%, respectively. MB dye was almost completely mineralized after 90 min of visible light irradiation in the presence of the TiO₂-THS catalyst. The prepared photocatalyst exhibited better stability and maintained its initial activity after being reused for six successive runs with a decolorization efficiency of 86.62%.

这项工作介绍了TiO ₂ /白蚁丘陵土壤（TiO ₂ -THS）的制备，表征及其在阳离子染料（亚甲基蓝，MB）在水溶液中降解中的光催化应用。TiO ₂-THS是用浸渍法制备的。使用气体吸附，SEM，FTIR，XRF和XRD等技术表征材料的性能。使用Taguchi设计方法对可见光照射下MB的光催化降解进行了优化。研究了影响光催化降解过程，pH，初始浓度，辐照时间和光催化剂负载量的参数的影响。可以确定浓度，pH，时间和光催化剂负载量的最佳值分别为50 mg / L，6.0、90 min和0.5 g / L。在这些最佳条件下，预计的脱色效率和实验的脱色效率分别为96.31％和95.76％。在TiO ₂存在下90分钟的可见光照射后，MB染料几乎完全矿化-THS催化剂。所制备的光催化剂在连续六次重复使用后脱色效率为86.62％，显示出较好的稳定性并保持其初始活性。