The present study involves the removal of Astrazon Orange G dye from aqueous solutions by ZnO in a heterogeneous system of using UV-C light as a source of energy. Crystalline structure and BET surface area of the photocatalyst were characterized. The optimum conditions were determined as 200 mg dm^-3 of dye concentration, 4 g dm^-3 of catalyst amount, pH of 6, the temperature of 40 °C, and 0.2 dm³ min^-1 of the rate of airflow. Under these conditions, the dye and TOC removal efficiencies at 75 min were determined as 97.9 % and 54.7 %, respectively. Response surface methodology was also used to investigate the interactive effects of the selected parameters and the optimum conditions for maximum degradation of AOG dye. The kinetics of the Astrazon Orange G dye photodegradation by using ZnO represented by the first-order equation. The effect of the temperature on the AOG dye photodegradation was shown by using of the Arrhenius equation. The activation energy was found to be 4.28 kJ mol^-1. In addition, internal mass transfer effects on photodegradation of AOG dye were investigated with different sizes ZnO and effectiveness factors, Thiele modulus, and average effective diffusion coefficient were calculated. These results showed that the intraparticle mass transfer did not have much effect on the reaction rate and the chemical step largely controlled the rate. The potential performance of these photocatalytic processes on the synthetic wastewater was also tested.

本研究涉及在使用 UV-C 光作为能源的非均相系统中，通过 ZnO 从水溶液中去除 Astrazon Orange G 染料。表征了光催化剂的晶体结构和BET表面积。确定最佳条件为染料浓度200 mg dm ^{-3 、催化剂用量4 g dm -3}、pH 6、温度40℃、0.2 dm ³ min ^-1的气流速率。在这些条件下，75 分钟时染料和 TOC 的去除效率分别确定为 97.9 % 和 54.7 %。响应面法还用于研究所选参数的交互作用和 AOG 染料最大降解的最佳条件。使用 ZnO 光降解 Astrazon Orange G 染料的动力学由一级方程表示。通过使用 Arrhenius 方程显示了温度对 AOG 染料光降解的影响。发现活化能为4.28 kJ mol ^-1. 此外，研究了不同尺寸ZnO对AOG染料光降解的内部传质效应，并计算了有效性因子、蒂勒模量和平均有效扩散系数。这些结果表明，颗粒内传质对反应速率没有太大影响，化学步骤很大程度上控制了反应速率。还测试了这些光催化过程对合成废水的潜在性能。