Research progress of single-atom catalysts in persulfate activation
In recent years,persulfate-based advanced oxidation processes(PS-AOPs)have emerged as effective strategies for treating refractory organic pollutants in sewage.The key to achieving efficient persulfate activation for degrading such pollutants lies in the search for high-performance,highly stable,and cost-effective catalysts.In comparison to traditional metal nanoparticle catalysts,single-atom catalysts(SAC)used in PS-AOPs offer several advantages,including ultra-fast reaction rate,low metal loading capacity,and strong metal-carrier interaction.SAC exhibit atomic-level distribution of active centers,enabling the study of structure-activity relationships and multiple reaction mechanisms in heterogeneous catalytic systems at the atomic or even electronic level.However,research on SAC in PS-AOPs is still in its infancy.The review focuses on the activation mechanism of SAC in PS-AOPs to produce oxidation active species.The correlation between structural regulation and catalytic performance was systematically summarized,the structure-performance relationship was deeply understood,and the strategy of precise adjustment of catalyst active site was pointed out.Finally,the review provides insights into the opportunities and challenges in related research fields.
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