Colored contaminants in wastewater need to be removed prior to discharge due to their negative impacts on public health and the environment. Herein, immobilized TiO₂ on termite hill (TiO₂/TH) and ZnO-promoted TiO₂/TH (ZnO-TiO₂/TH) were synthesized, evaluated by different characterization techniques (XRF, XRD, FTIR, UV-Vis DRS, N₂ adsorption-desorption analysis and SEM), and the possibility of using them as photocatalysts for methylene blue (MB) degradation under solar irradiation investigated. The influence of photocatalytic reaction parameters (initial MB concentration, photocatalyst dosage and solution pH) was studied at fixed irradiation time. XRD and SEM results, among other analyses revealed successful incorporation of ZnO and TiO₂ on structured support (TH), while UV-Vis analysis affirmed reduction in band gap energy due to immobilizing effect. The optimized photocatalytic degradation variables were 50 mg/L dye concentration, 1.2 g/L photocatalyst dosage and 6.0 pH. The ZnO-TiO₂/TH showed better photoactivity for MB degradation than TiO₂/TH under the same conditions which could be attributed to a reduction in band gap energy from 2.94 eV to 2.85 eV upon addition of ZnO. More than 80% degradation efficiency was achieved after the 7th cycle, depicting better stability. A pseudo-first-order Langmuir-Hinshelwood model with a rate constant of 0.0774 min⁻¹ and R² of 0.9971 at optimum dye concentration (50 mg/L) appeared to best describe the photocatalytic degradation kinetic data. The UV-Vis spectra changes and decrease in total organic carbon indicated that ZnO-TiO₂/TH photocatalyst has the prospect to degrade organic pollutants in industrial effluent completely.

由于废水中的有色污染物会对公众健康和环境产生负面影响，因此需要在排放前去除它们。在此，合成了白蚁山上的固定化 TiO _{2 (TiO 2} /TH) 和 ZnO 促进的 TiO ₂ /TH (ZnO-TiO ₂ /TH)，并通过不同的表征技术（XRF、XRD、FTIR、UV-Vis DRS、 N ₂吸附-脱附分析和SEM），以及将它们用作太阳辐照下亚甲基蓝（MB）降解的光催化剂的可能性。在固定辐照时间研究了光催化反应参数（初始 MB 浓度、光催化剂用量和溶液 pH 值）的影响。X射线衍射和除其他分析外，SEM 结果显示 ZnO 和 TiO ₂成功掺入结构化载体 (TH) 上，而 UV-Vis 分析证实由于固定效应导致带隙能量降低。优化的光催化降解变量为 50 mg/L 染料浓度、1.2 g/L 光催化剂用量和 6.0 pH。在相同条件下， ZnO-TiO _{2 /TH 表现出比 TiO 2} / TH 更好的 MB 降解光活性，这可归因于添加 ZnO 后带隙能量从 2.94 eV 降低到 2.85 eV。第 7 次循环后降解效率达到 80% 以上，稳定性更好。^{速率常数为 0.0774 min -1}和 R ²的伪一阶 Langmuir-Hinshelwood 模型在最佳染料浓度 (50 mg/L) 下为 0.9971 似乎最好地描述了光催化降解动力学数据。UV-Vis光谱的变化和总有机碳的减少表明ZnO-TiO ₂ /TH光催化剂具有完全降解工业废水中有机污染物的前景。