钴锰硫化物活化过硫酸盐强化降解盐酸四环素

Enhanced degradation of tetracycline hydrochloride by cobalt-manganese sulfide activated peroxymonosulfate.

采用简单两步法制备了钴锰双金属硫化物(MnCo_(2)S_(4)).通过扫描电子显微镜,X射线衍射,X射线光电子能谱等表征手段对MnCo_(2)S_(4)的形貌,晶体结构,组成成分等进行分析.探究了MnCo_(2)S_(4)/PMS体系中盐酸四环素的降解效能和降解路径,结果表明,MnCo_(2)S_(4)和PMS投加量为0.1g/L,TC的降解率在30min达到88%,在较宽的pH值范围内(3~9)均具有较高的降解率,这归因于MnCo_(2)S_(4)中金属活性位点Mn^(2+),Co^(2+)的持续供应和钴锰的协同作用.淬灭实验和电子顺磁共振(EPR)技术表明MnCo_(2)S_(4)/PMS体系主要是SO_(4)•-,•OH和^(1)O_(2)共同作用降解TC.本研究为PMS的活化和抗生素等难降解污染物的去除提供了新的催化剂构建策略.

Manganese and cobalt bimetallic sulfide(MnCo_(2)S_(4))was prepared by a simple two-step method.The morphology,crystal structure and composition of MnCo_(2)S_(4)were analyzed by scanning electron microscope,X-ray diffraction and X-ray photoelectron spectroscopy,respectively.Degradation efficiency and pathways of tetracycline hydrochloride in MnCo_(2)S_(4)/PMS system were explored.The degradation efficiency of TC reached 88%in 30min when concentrations of MnCo_(2)S_(4)and PMS were both 0.1g/L.The degradation efficiency of TC remained high in wide pH value range(3~9),which was attributed to the continuous supply of metal active sites of Mn^(2+)and Co^(2+)in MnCo_(2)S_(4)and the synergistic effect of cobalt and manganese.Quenching experiment and electron paramagnetic resonance(EPR)technology provided that SO_(4)•-,•OH and^(1)O_(2)were the main active species in MnCo_(2)S_(4)/PMS system.This research gives a new strategy for bimetallic sulfide catalyst construction to activate PMS and treat refractory pollutants.