钴氰化铜异质催化剂的制备及其在光电类芬顿降解左氧氟沙星中的应用

Preparation of copper hexacyanocobaltate heterogeneous catalyst and its application in degradation oflevofloxacin by photo-electro-Fenton-like process

采用循环伏安法在附有氨基化石墨烯(GNs)的ITO导电玻璃上电沉积钴氰化铜(Cu3[Co(CN)6]2,记为CuHCC),得到了多功能非均相催化电极CuHCC/GNs/ITO,并通过X射线衍射和扫描电镜对其进行了表征。研究了以CuHCC/GNs为光电类芬顿催化剂,在pH 7.0的含2 mmol/L N,N−二甲基−4−亚硝基苯胺(RNO)和0.1 mol/L Na2HPO4的氧饱和溶液中不同恒电位(−0.4、−0.6和−0.8 V,相对于饱和甘汞电极)下生成羟基自由基浓度的变化。最终选择在−0.8 V和300 W可见光照射下,在pH 7.0的0.1 mol/L Na2HPO4介质中降解10 mg/L的左氧氟沙星(LEVO),并通过紫外可见光谱图得出LEVO的降解率高达91%。

Copper hexacyanocobaltate(Cu3[Co(CN)6]2,coded as CuHCC)was electrodeposited on amino-functionalized graphene(GNs)-coated indium tin oxide(ITO)glass by cyclic voltammetry to form a multifunctional heterogeneous catalytic CuHCC/GNs/ITO electrode,which was characterized by X-ray diffractometry and scanning electron microscopy.The variation of the concentration of hydroxyl radicals generated in an oxygen-saturated solution(pH 7.0)containing N,N-dimethyl-4-nitrosoaniline(RNO)2 mmol/L and Na2HPO40.1 mol/L at different constant potentials(−0.4,−0.6,and−0.8 V,vs.saturated calomel electrode)was studied using the CuHCC/GNs as a photo-electro-Fenton-like catalyst.The degradation of levofloxacin(LEVO)with an initial mass concentration of 10 mg/L in a 0.1 mol/L Na2HPO4 medium(pH 7.0)was conducted at−0.8 V under 300-W visible light irradiation.The ultraviolet absorption spectra showed that the degradation efficiency of LEVO was as high as 91%.