The current study aimed to investigate the removal efficiency of acid orange-7 (AO7) using synthesized Cr/TiO₂ immobilized on pumice powder under visible light and UV irradiation. The characterization of synthesized nanocatalyst examined by scanning electron microscope, X-ray diffraction, and Fourier transforms infrared. The optimum of experimental parameters including catalyst dosage, dye concentration, time and pH, D-optimal Design (DOD) along with response surface methodology obtained by R software. The initial and outlet concentration was measured using a spectrophotometer. Besides, Analysis of variance results for the quadratic model showed simple linear regression with high significance and provided as a predicting model. The differences less than 0.2 between multiple and adjusted R² in two models indicate that two examined models fitted suitably. The highest removal efficiency of AO7 was 95 and 74% under visible and UV irradiation, respectively. Therefore, the higher removal efficiency in visible light reduces the costs and energy, moreover, offers an environmentally friendly method. The results showed that the removal efficiency of AO7 increased considerably with rising catalyst dosage and time, as well as minimizing dye concentration, and pH.

目前的研究旨在研究使用固定在浮石粉上的合成 Cr/TiO ₂在可见光和紫外线照射下对酸性橙 7 (AO7) 的去除效率。通过扫描电子显微镜、X 射线衍射和傅里叶变换红外检测合成纳米催化剂的表征。实验参数的优化包括催化剂用量、染料浓度、时间和 pH 值、D 最优设计 (DOD) 以及 R 软件获得的响应面方法。使用分光光度计测量初始浓度和出口浓度。此外，二次模型的方差分析结果显示简单的线性回归具有高显着性，并作为预测模型提供。倍数和调整后的 R ²之间的差异小于 0.2在两个模型中表明两个检查模型合适地拟合。在可见光和紫外线照射下，AO7 的最高去除效率分别为 95% 和 74%。因此，可见光中更高的去除效率降低了成本和能源，而且提供了一种环境友好的方法。结果表明，随着催化剂用量和时间的增加，以及染料浓度和 pH 值的降低，AO7 的去除效率显着增加。