A new nanohybrid photocatalyst named cerium (IV) oxide (CeO₂)/TiO₂ (titania)/silicon dioxide (SiO₂) was firstly synthesized employing the co-precipitation technique to elaborate the degradation efficiency of chlorpyrifos (CPS) as a relatively indelible organophosphorus pesticide in deionized water in photocatalytic and sonophotocatalytic processes. The influence of various parameters, including photocatalyst dosage, the CPS pesticide concentration, pH, and irradiation time, was investigated, and the optimal parameters for photodegradation and sonophotodegradation were determined. The activity and the electrical energy of this photocatalyst in the photodegradation and sonophotodegradation processes were compared, and it was revealed that the sonophotocatalytic process was superior to the photocatalytic one (about 15%). Results depicted that it can be employed four times for the photocatalytic reactions with the same yield of CPS degradation. Besides, the CPS degradation efficiency at the optimum conditions was found to be 81.1% and 90.8% for the photo-degradation and sonophotodegradation, respectively. Pursuant to the kinetic studies, the kinetics models that govern these processes are leaner with acceptable accuracy.

中文翻译：

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CeO2/TiO2/SiO2纳米催化剂用于光催化和声光催化降解毒死蜱

一种新型纳米混合光催化剂，命名为氧化铈 (IV) (CeO ₂ )/TiO ₂ (二氧化钛)/二氧化硅 (SiO _{2 )}) 首次采用共沉淀技术合成，阐述了毒死蜱 (CPS) 作为去离子水中相对不易去除的有机磷农药在光催化和声光催化过程中的降解效率。研究了光催化剂用量、CPS农药浓度、pH值和辐照时间等各种参数的影响，确定了光降解和声光降解的最佳参数。比较了该光催化剂在光降解和声光降解过程中的活性和电能，结果表明声光催化过程优于光催化过程（约 15%）。结果表明，它可以用于光催化反应四次，CPS 降解率相同。此外，在最佳条件下，光降解和声光降解的 CPS 降解效率分别为 81.1% 和 90.8%。根据动力学研究，控制这些过程的动力学模型更精简，具有可接受的准确性。