Ag-Fe_(2)O_(3)活化过一硫酸盐降解水中磺胺甲唑

Activation of peroxymonosulfate by Ag-Fe_(2)O_(3) for degradation of sulfamethoxazole in water

采用沉淀—煅烧法制备了Ag掺加α-Fe_(2)O_(3)催化剂Ag-Fe_(2)O_(3),通过TEM、XRD和XPS等手段进行了表征,并将该催化剂用于活化过一硫酸盐(PMS)降解水中磺胺甲唑(SMX),考察了不同因素对SMX去除率的影响,探讨了Ag-Fe_(2)O_(3)+PMS体系降解SMX的机理。实验结果表明,Ag-Fe_(2)O_(3)催化剂呈均匀针状;在Ag-Fe_(2)O_(3)投加量为0.10 g/L、PMS浓度为0.10 mmol/L、初始pH为7.0、反应温度为25℃的条件下,反应20 min后,SMX的去除率为83.8%;该体系中催化降解SMX的主要活性物种为O_(2)^(-)·、1O2和SO_(4)^(-)·。

The Ag dopedα-Fe_(2)O_(3) catalyst(Ag-Fe_(2)O_(3))was prepared by a precipitation and calcination method and characterized by TEM,XRD and XPS.The catalyst was used to activate peroxymonosulfate(PMS)for degradation of sulfamethoxazole(SMX)in water.The factors affecting the SMX removal rate were investigated,and the mechanism of the Ag-Fe_(2)O_(3)+PMS system for SMX degradation was discussed.The results show that the Ag-Fe_(2)O_(3) catalyst possesses a unique needle-like shape;Under the conditions of Ag-Fe_(2)O_(3) amount 0.10 g/L,PMS concentration 0.10 mmol/L,initial pH 7.0,reaction temperature 25℃and reaction time 20 min,the SMX removal rate is 83.8%;The predominant active species for catalytic degradation of SMX in this system are O_(2)^(-)·,1O2 and SO_(4)^(-)·.