泡沫铜负载MgCoFe-LDO激活过一硫酸盐降解磺胺甲(口恶)唑OA

Layered double oxides(LDO)can activate peroxymonosulfate(PMS)and generate a large number of active species to efficiently degrade various organic micropollutants in water.However,the problems of metal ion leaching and difficult recovery during the catalytic reaction process of metal oxide catalysts affect their practical applications.Magnesium-cobalt-iron layered double oxides are synthesized by hydrothermal method and loaded onto copper foam(MgCoFe-LDO@f-Cu)to activate PMS for the degradation of sulfamethoxazole(SMX).The experimental results show that the copper foam loaded with MgCoFe-LDO with a specification of 80 PPI,a calcination temperature of 300 ℃,and a calcination time of 3 h,the catalyst activates the degradation of SMX by PMS better.When the dosage of MgCoFe-LDO@f-Cu is 10 g/L,the initial concentration of PMS is 1 mmol/L,and the initial pH value is 7,the 20 mg/L SMX degradation efficiency in 20 min can reach 96.04％,and the SMX degradation efficiency in the MgCoFe-LDO@f-Cu/PMS system is still up to 83.87％after five times of reuse.The ion leaching assay shows that the leaching rates of total magnesium,total cobalt and total iron in MgCoFe-LDO@f-Cu decrease respectively by 41.50％,28.84％and 30.81％compared with those in MgCoFe-LDO,which indicates that the MgCoFe-LDO@f-Cu catalyst is more stable and easier to be recycled.