The selective sono/photocatalytic degradation of methyl orange (MO) in a mixture of methylene blue (MB) by synthesized ZnO/Al₂O₃ nanocomposites via ultrasound-assisted sol-gel method was studied. The synthesized samples were analyzed by XRD, TEM, EDX, BET, FTIR, UV-vis and Zeta potential analysis. The results showed that the ZnO nanoparticles were hexagonal wurtzite structures that changed to a flake-like quadrilateral morphology by enhancing the Al₂O₃ dosage. To optimize the selective removal efficiency of MO, response surface methodology (RSM) based on the central composite design (CCD) was applied to study the influence of Al₂O₃ dosage, catalyst amount, dye concentration and reaction time. A reliability prediction based on a second-order model was achieved with a high coefficient of determination (R²) and adjusted R² of 0.9914 and 0.9834 for the optimized removal process, respectively. The MO optimal conditions of selective removal efficiency were found at 6.39 wt% of Al₂O₃ dosage, 32.2 mg catalyst amount, 7mg/L of dye concentration and reaction time of 150min to achieve 91.42% removal of MO dye. In the optimal conditions of selective removal, the advanced sono/photocatalytic technique was used to investigate the complete degradation of the adsorbed MO on the catalyst surface. The FTIR spectrum of the MO degradation shows complete removal of some bands compared to the initial control dye, which confirms the degradation of MO after ultrasonic (US) and ultraviolet (UV) irradiation. The use of ZnO/Al₂O₃ nanocomposites in sonocatalysis process leads to producing electron/hole pairs, whereby the production of reactive oxygen species, MO selected molecules were oxidized quickly.

研究了通过超声辅助溶胶-凝胶法合成的 ZnO/Al ₂ O ₃纳米复合材料对亚甲蓝 (MB) 混合物中甲基橙 (MO) 的选择性声/光催化降解。通过XRD、TEM、EDX、BET、FTIR、UV-vis和Zeta电位分析对合成的样品进行分析。结果表明，ZnO纳米颗粒为六方纤锌矿结构，通过增加Al ₂ O ₃用量而转变为片状四边形形态。为了优化 MO 的选择性去除效率，应用基于中心复合设计 (CCD) 的响应面法 (RSM) 来研究 Al ₂ O ₃的影响用量、催化剂用量、染料浓度和反应时间。基于二阶模型的可靠性预测是通过高决定系数 (R ² ) 和调整后的 R ^{2 分别}为 0.9914 和 0.9834 的优化去除过程实现的。发现选择性去除效率的 MO 最佳条件为 6.39 wt% Al ₂ O ₃用量、催化剂用量32.2mg、染料浓度7mg/L、反应时间150min即可实现91.42%的MO染料去除率。在选择性去除的最佳条件下，采用先进的声/光催化技术研究吸附在催化剂表面的 MO 的完全降解。与初始对照染料相比，MO 降解的 FTIR 光谱显示完全去除了一些波段，这证实了超声波 (US) 和紫外线 (UV) 照射后 MO 的降解。在声催化过程中使用 ZnO/Al ₂ O ₃纳米复合材料导致产生电子/空穴对，从而产生活性氧，MO 选择的分子被快速氧化。