普鲁士蓝衍生制得的C-Co活化过一硫酸盐处理亚甲基蓝废水的研究

Preparation of C-Co Derived From Co Prussian Blue Analogues as an Activator of Peroxymonosulfate for the Degradation of Methylene Blue.

利用普鲁士蓝为前驱体制备含钴碳催化剂C-Co,并用于活化过一硫酸盐(PMS)降解亚甲基蓝废水。该C-Co催化剂较Co 3 O 4表现出更高的催化PMS性能,反应40 min后30 mg·L^-1亚甲基蓝的降解率达90.0%。该反应过程符合二级反应动力学,反应速率常数达1.57×10^3 L·mol^-1·min^-1。该研究还考察了温度、pH值、PMS浓度和共存离子等对C-Co活化PMS降解亚甲基蓝的影响,并进一步通过自由基捕获实验探究了反应过程中的活性物种。结果证明该C-Co催化剂活化PMS产生的单线态氧在降解亚甲基蓝过程中起主导作用。此外,C-Co催化剂在该反应中表现出良好的稳定性,重复利用3次后仍然保持较高的降解效率。

A Prussian blue derived C-Co catalyst was synthesized and used to activate peroxymonosulfate(PMS)for the degradation of methylene blue.The C-Co catalyst exhibited higher catalytic performance than that of Co 3 O 4,reaching degradation rate of 90.0%for 30 mg·L^-1 methylene blue in 40 minutes.The reaction process was fitted by the pseudo-second order kinetic model,and the reaction rate constant was 1.57×10^3 L·mol^-1·min^-1.The effect of temperature,pH,PMS concentration and coexisting ions on methylene blue degradation rates were also investigated during the activation of PMS by C-Co.The reactive radicals in the reaction were further explored by free radical trapping experiments.The results demonstrate that the singlet oxygen produced by PMS activation played an important role in methylene blue degradation.Moreover,C-Co had a good reusability,keeping a high degradation rate after having been reused for three times.