Applied Chemistry Department, Faculty of Chemistry, Bu-Ali Sina University, Hamedan, 65178-38683, Iran.
Environ Sci Pollut Res Int. 2022 Nov;29(52):78444-78456. doi: 10.1007/s11356-022-21249-z. Epub 2022 Jun 11.
The performance of novel hybrid advanced oxidation, ozone-sono-Fenton process in degradation of acid orange 7 (AO7), as a model of azo dyes was modelled and optimized using response surface methodology (RSM) based on central composite design (CCD). Utilizing a bubbling reactor equipped with an ultrasound probe and in the presence of Fenton reagents, a promising hybrid homogeneous AOP, ozone-sono-Fenton, was investigated. According to the experimental results, the variation trend of degradation efficiency (DE%) with pH, reaction time and Fe/HO molar ratio was modelled with the reduced quadratic model. Additionally, the suitability of the model was indicated with close to unity regression coefficient [Formula: see text]. Furthermore, the comparative study of degradation efficiency and COD removal for the individual methods including ozonation, sonication and Fenton reagents as well as their hybrid processes reveals that the novel proposed technique, ozone-sono-Fenton process, is able to rapid and complete degradation of acid orange 7 with initial concentration of 300 mg L, 100% in only 12 min. The complete degradation was obtained under optimum conditions such as pH = 6, reaction time = 12 min and Fe/HO molar ratio = 0.0040. The kinetics evaluation of the acid orange 7 concentration during the processing implied the first-order reaction. Considering the synergetic effect and cost-effectiveness of the hybrid method, the promising ozone-sono-Fenton method could effectively degrade using a wide range of organic contaminants.
采用基于中心复合设计（CCD）的响应面法（RSM）对新型混合高级氧化、臭氧-声-Fenton 工艺降解酸性橙 7（AO7）（偶氮染料模型）的性能进行了模拟和优化。在芬顿试剂存在下，利用配备超声探头的鼓泡反应器，研究了一种很有前途的混合均相 AOP，即臭氧-声-Fenton。根据实验结果，采用降二次模型对降解效率（DE%）随 pH、反应时间和 Fe/HO 摩尔比的变化趋势进行了建模。此外，接近 1 的回归系数[公式：见文本]表明了模型的适用性。此外，对单独方法（包括臭氧化、声化学和芬顿试剂以及它们的混合工艺）的降解效率和 COD 去除率的比较研究表明，新型提出的技术，臭氧-声-Fenton 工艺，能够快速完全降解初始浓度为 300 mg L 的酸性橙 7，仅需 12 分钟即可达到 100%。在最佳条件下（pH=6、反应时间=12 分钟和 Fe/HO 摩尔比=0.0040）可实现完全降解。在处理过程中酸性橙 7 浓度的动力学评估表明该反应为一级反应。考虑到混合方法的协同效应和成本效益，有前途的臭氧-声-Fenton 方法可以有效地降解广泛的有机污染物。
