Abstract
Advanced oxidation methods (AOPs) based on persulfate (PS) for the degradation of organic pollutants in water have the advantages of mild conditions, green efficiency, and so on. However, its activation often requires input of energy or the introduction of other chemical substances, resulting in high energy consumption and easy secondary pollution. The Z-scheme heterojunction photocatalyst (sometimes also known as S-scheme heterojunction), one hand, the built-in electric field formed between the two phases can promote the separation of photo generated electron hole pairs, transfer and form various free radicals, which can efficiently degrade organic pollutants; On the other hand, the photo generated electrons generated by Z-scheme heterojunctions have certain reducibility and can capture persulfate ions and activate them. Therefore, the use of Z-scheme heterojunction photoactivation for persulfate degradation of organic pollutants has great potential. Based on this, this review first elaborates on the principle and progress of photocatalytic activity for the degradation of antibiotics by persulfate. Secondly, the construction of Z-scheme heterojunctions, the mechanism of activating persulfates, and their applications in photodegradation were reviewed. Furthermore, a detailed discussion was given on the photocatalytic degradation of organic pollutants using Z-scheme heterojunctions based on hydrotalcite. Finally, five prospects were proposed regarding the structure, degradation targets, and mechanisms of the materials.
Published Version
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