Co/Sb修饰分子筛粒子电极用于电催化降解实验研究

Preparation of Co/Sb modified molecular sieve particle electrode for electrocatalytic degradation

为提高分子筛作为粒子电极的电催化降解效率,通过浸渍法将Co/Sb负载于MCM-41上制备粒子电极降解卡马西平(CBZ)。考察了初始pH、电压、电解质浓度等因素对CBZ降解率的影响,并对羟基自由基进行检测,分析了CBZ可能的降解路径。结果表明,当钴和锑体积比为2∶1时制得的粒子电极电催化效果最优,在初始pH为3、电压为8 V、电解质浓度为0.1 mol/L、粒子质量浓度为0.2 g/L时,初始浓度为20μmol/L的CBZ在120 min内降解率能达到100%,与二维电极相比其降解效率提高大约23%。CBZ的三维电催化降解反应符合拟一级动力学模型。

In order to improve the electrocatalytic degradation efficiency of molecular sieve as particle electrode,Co/Sb is doped and loaded on MCM-41 molecular sieve by impregnation method to prepare particle electrode for the degradation of carbamazepine.The effects of initial pH,voltage and electrolyte concentration on the degradation efficiency of carbamazepine are investigated,hydroxyl radicals are detected,and the possible degradation path is analyzed.The results show that the particle electrode prepared under a cobalt to antimony molar ratio of 2∶1 exhibits the best electrocatalytic effect,over which the degradation efficiency of carbamazepine reaches 100%within 120 min when the initial pH is 3,the voltage is 8 V,the electrolyte concentration is 0.1 mol·L-1,the dosage of particles is 0.2 g·L-1,and the initial concentration of carbamazepine is 20μmol·L-1.The degradation efficiency is about 23%higher than that over two-dimensional electrode.The three-dimensional electrocatalytic degradation of carbamazepine accords with the pseudo first-order dynamic model.