Co-catalytic of aluminosilicate stabilized cobalt for peroxymonosulfate activation to degrade levofloxacin

Stabilization of Co was essential to address its pollution. In this work, geopolymerization was used to stabilize the Co 2+ in the presence of alumina-silicate under hydrothermal process, in which the Co 2+ is hypothesized to be a substitute of cation to balance the charge. Then the Co 2+ could be incorporated into the geopolymer stably being named as Al x Si y Co z -T. Interestingly, the Co 2+ stabilized Al x Si y Co z -T was recycled and reused for peroxymonosulfate (PMS) activation. The stability and catalytic activity of the Al x Si y Co z -T in PMS activation was evaluated. Results showed that the alumina and silicate geopolymerization played positive role in Co 2+ stabilization, what were determined by the molar ratio of alumina to silicate, hydrothermal process. Besides, the Al x Si y Co z -T performed favorable activity in PMS activation for LEV degradation with an efficiency of 98.84 % and rate constant of 0.1154 min −1 . In this case, the Co 2+ was the main catalyst in PMS activation, while the alumina-silicate geopolymerization not only contributed to Co 2+ stabilization, but also resulted in the formation of oxygen vacancy. Then the co-catalytic of alumina-silicate in PMS activation was understood by the synergy factor. The Co 2+ leaching efficiency of AlSi 2 Co 4 -200 is only 0.011 %, confirming the heterogeneous catalytic in PMS activation. The Al x Si y Co z -200 performed favorable stability that could be used for five cycles at least. 1 O 2 , SO 4 − • and •OH contributed to LEV degradation. Thus, the alumina and silicate geopolymerization could play important role in stabilization and co-catalytic for activating PMS, performing the dual effect on waste treatment and resource recycle.