Highly efficient cobalt-based amorphous catalyst for peroxymonosulfate activation toward wastewater remediation

摘要

Metallic glasses(MGs)are rising novae in the catalytic field,due to their unique amorphous structure,large residual stress,and high density of low coordination sites.However,there is still an absence of suitable MGs'catalysts for advanced oxidation processes(AOPs)with peroxymonosulfate(PMS),the most efficient and promising wastewater remediation technology.Herein,the cobalt-based MG(Co-MG)with a nominal composition of Co_(67)Fe_(4)-Mo_(1.5)Si_(16.5)B_(11)(at%)was utilized as an activator of PMS for azo dye degradation.The results demonstrated that the CoMG/PMS system had an order of magnitude higher efficiency on OrangeⅡ(OII)degradation than the Fe-MG/PMS system.For fundamental study and field application,the effect of adding inorganic anions(Cl^(-),HCO_(3)^(-),H_(2)PO_(4)^(-),SO_(4)^(2-),NO_(3)^(-)),environmental factors,and cycle experiments on the catalytic properties of Co-MG were investigated emphatically to evaluate overall degradation performance.It has demonstrated that the Co-MG with more stability,better corrosion resistance and durability contrasted to Fe-MGs.In addition,the excellent catalytic performance of Co-MG was analyzed based on the quenched experiment,electron paramagnetic resonance(EPR),and X-ray photoelectron spectroscopy(XPS)analysis.The present results provide not only a new candidate but also shed light on exploring a new kind of AOPs system based on Co-MGs for wastewater treatment.