Confined catalytic with yolk-shell nanoreactor boosting the efficient removal of antibiotic by low temperature plasma-catalytic degradation: Reaction kinetics and mechanisms

Confined catalytic provides a novel approach to achieve efficient removal of pollutants, however, the tedious preparation process and lower catalytic activity of catalysts are the main restrict for their widespread use. Here, the in-situ doping and reaction kinetics regulation strategy have been proposed to prepare yolk-shell Fe3O4/Co3O4/[email protected]2 nanoreactors (YSFNs) for plasma-catalytic degradation of organic pollutant. In the preparation process, on the one hand Fe(acac)3 was in-suit doped into ZIF-67, on the other hand the nucleation/growth rate of ZIF-67 is faster than the hydrolysis/polycondensation rate of tetraethyl silicate (TEOS), and thus generated Fe/[email protected]2 precursor. To present the advantages of YSFNs, dielectric barrier discharge (DBD) plasma for tetracycline (TTCH) degradation was chosen as the model reaction. The results indicate that YSFNs-2 display excellent TTCH degradation performance over only DBD, YSCNs-1/2/3 and Fe3O4/Co3O4/C nanoparticles (FNs). The enhanced catalytic performance is ascribed to two aspects: (i) confinement effect of yolk-shell structure improves the utilization rate of active species (structure advantage); (ii) graphitized carbon increases electrical conductively while dispersing the active sites, and thus improves the reaction kinetics (composition advantage). This work indicates that MOFs-derived catalysts with confined catalytic have a promising application prospect for environmental remediation via DBD plasma.