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

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.

Fe-based metallic glass as heterogeneous Fenton-like catalyst for azo dyes degradation:effect of inorganic anions

Metallic glasses(MGs) are promising heterogeneous catalysts in water remediation,due to their superior efficiency,selectivity,reusability and corrosion resistance.However,few works are focused on the influence of inorganic anions that are abundant in wastewater.Herein,four common inorganic anions were added in a heterogeneous Fenton-like system(Fe-MG/H_(2)O_(2)) to study inorganic anions' influence on MGs' catalytic performance during methylene blue(MB) degradation.Evidence demonstrated that chloride ions and dihydrogen phosphate ions had an adverse effect on the catalytic performance of Fe-MG,whereas Fe-MG/H_(2)O_(2) system sustained high efficiency in the presence of sulfate ions and nitrate ions during the Fenton-like process.By studying the structure,surface morphology,and evolution of active species,it was found that inorganic anions had a significant effect on the surface morphology of Fe-MG and the generation of active species.This work will provide essential references for MGs as heterogeneous catalysts in practical applications.