Abstract:

This study used solvothermal method to synthesize two vanadium-doped bimetallic catalysts, and compared their heterogeneous Fenton degradation performance of Methylene blue. The samples were characterized by SEM, XRD, XPS, etc. The two catalysts showed good capacities for degradation of Methylene blue in both acidic to alkaline solutions (pH=3—10). The highest removal rate of Methylene blue by the Cu-V composite material was 95.60% at pH=10, while that by the Fe-V composite material reached 96.6% at pH=3. Both the Cu-V and Fe-V composite materials had good reusability. After six consecutive runs at pH=7, the removal rate of methylene blue remained at 79.16% and 68.22%, respectively. The mechanism of the catalytic reaction system has been preliminarily discussed. The hydroxyl radical is the main active species, but the catalytic mechanisms of the two catalysts are slightly different.

Key words: bimetallic catalyst, heterogeneous Fenton, synergy, waste water, mechanism

摘要：

为了合理设计有效的非均相芬顿催化剂，本研究采用溶剂热法合成了两种钒掺杂双金属催化剂，并比较了它们的非均相芬顿降解亚甲基蓝的性能。还通过扫描电子显微镜（SEM）、X射线衍射（XRD）、X射线光电子能谱（XPS）等技术手段对样品进行了表征。结果显示，两种催化剂对酸性到碱性（pH=3~10）的亚甲基蓝溶液均有较好的降解效果，Cu-V复合材料在pH=10时对亚甲基蓝的去除率最高，达到95.60%；Fe-V复合材料在pH=3时对亚甲基蓝的去除率最高，达到96.60%。Cu-V、Fe-V复合材料均具有良好的重复利用性，在pH=7的条件下连续运行六次后，对亚甲基蓝的去除率仍分别保持在79.16%和68.22%。对催化反应体系的机理进行了初步探讨，羟基自由基是主要的活性物种，两种催化剂的催化机理略有不同。

关键词: 双金属催化剂, 非均相 Fenton, 协同作用, 废水, 机制