Performance and mechanism of degradation of bisphenol A by cobalt-based catalysts loaded on silicate-calcium solid waste activating peroxymonosulfate
The efficient and clean utilization of bulk silicate-calcium solid wastes is always a hot topic.Due to the complex problems such as their diverse phase types and large microstructure differences,silicate-calcium solid wastes are mainly taken for the low-value resource utilization such as building materials and road construction materials,which lacks market competitiveness and handling capacity,so it is very important to realize green high-value utilization of silicate-calcium solid wastes.In this study,two catalysts,such as Co@SS-CSH-700 derived from steel slag and Co@FA-CSH-700 derived from fly ash,were prepared to degrade bisphenol A(BPA)in wastewater.The results showed that Co@FA-CSH-700 exhibited a fluffier structure than Co@SS-CSH-700,and provided more active sites for peroxymonosulfate(PMS),which promoted the degradation of BPA.The study demonstrated that the degradation efficiency of BPA in PMS/Co@SS-CSH-700 system exceeded 99.9％within 30 minutes,while in PMS/Co@FA-CSH-700 system,BPA could be completely degraded within 5 minutes,showing a very high catalytic efficiency.Furthermore,the study also found that SO4·-free radicals were key active species for BPA degradation,whereas OH and 1O2 had slight effects.Based on the above studies,the mechanism of BPA degradation by cobalt-based catalysts loaded on silicate-calcium solid waste activating PMS was proposed.This study provides a new technical path for the preparation of high efficient catalysts from industrial solid wastes to treat organic pollutant wastewater.
steel slagcoal fly ashhydrated calcium silicatecobalt-contaminated wastewaterperoxymonosulfatebisphenol A
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