Cu-Zn-Ce催化剂紫外辅助CWPO工艺降解活性艳红X-3B

Degradation of Reactive Brilliant Red X-3B by UV-CWPO process with Cu-ZnCe catalyst

采用浸渍法制备具有较高催化活性的催化剂CuO-ZnO-CeO2/γ-Al2O3,并利用扫描电子显微镜(SEM)、X射线衍射(XRD)等不同表征手段对催化剂进行了表征.结果表明,稀土Ce的掺杂较好地改善了催化剂表面颗粒的形态,有利于催化剂活性的提高和在非晶体形态下具有更好的催化性能.紫外辅助CWPO工艺对活性艳红X-3B有较好的降解效果,采用紫外/可见分光光度计(UV-Vis)对染料降解过程进行跟踪和分析,结果表明,染料褪色的主要原因是羟基自由基(·OH)攻击偶氮键使其断裂.同时,本文对紫外辅助CWPO降解机理进行了研究,并通过叔丁醇羟基捕获剂进一步证明了紫外辅助CWPO降解活性艳红X-3B过程产生了·OH,且降解过程遵循自由基反应机理.对降解过程进行动力学研究,发现其符合伪一级动力学模型,表观活化能为32.79 kJ·mol-1,说明降解过程是化学控制过程.

The catalyst CuO-ZnO-CeO2/γ-Al2O3with high catalytic activity was prepared by impregnation,and examined by SEM and XRD. The results showed that doping Ce could preferably improve the morphology of particles on the surface of catalyst,which improved the catalyst activity and catalytic performance in non-crystalline form. The prepared catalyst was employed to degrade Reactive Red X-3B wastewater by the UV assisted CWPO process.The tracking and analysis of the degradation process by UV-Vis showed that the main reason of the dye fading was that hydroxyl radicals（ ·OH） attacked azo bond and made it broken. The degradation mechanism of UV-assisted CWPO process was also studied in this paper. Tert-butanol hydroxyl trapping agent was taken to prove the ·OH generation in the degradation process and the degradation process followed the radical mechanism. Degradation kinetics fitted well to pseudo-first-order kinetics model. The apparent activation energy was 32. 79 kJ·mol-1,which indicated a chemically controlled reaction process.