Boosting peroxymonosulfate activation via Co-based LDH-derived magnetic
catalysts: a dynamic and static state assessment of efficient
radical-assisted electron transfer processes
Abstract
Heterogeneous catalysts promoting efficient production of reactive
species and dynamically stabilized electron transfer mechanisms for
peroxomonosulfates (PMS) still lack systematic investigation. Herein, a
more stable magnetic layered double oxides (CFLDO/N-C), was designed
using self-polymerization and high temperature carbonization of
dopamine. The CFLDO/N-C/PMS system effectively activated PMS to remove
99% (k=0.737 min-1) of tetracycline (TC) within 10 min. The
CFLDO/N-C/PMS system exhibited favorable resistance to inorganic anions
and natural organics, as well as satisfactory suitability for multiple
pollutants. The magnetic properties of the catalyst facilitated the
separation of catalysts from the liquid phase, resulting in excellent
reproducibility and effectively reducing the leaching of metal ions. An
electronic bridge was constructed between cobalt (the active platform of
the catalyst) and PMS, inducing PMS to break the O-O bond to generate
the active species. The combination of static analysis and dynamic
evolution confirmed the effective adsorption of PMS on the catalyst
surface as well as the strong radical-assisted electron transfer
process. Eventually, we further identified the sites where the reactive
species attacked the TC and evaluated the toxicity of the intermediates.
These findings offer innovative insights into the rapid degradation of
pollutants achieved by transition metals in SR-AOPs and its mechanistic
elaboration.