Thermo-responsive functionalized PNIPAM@Ag/Ag3PO4/CN-heterostructure photocatalyst with switchable photocatalytic activity

doi:10.1016/S1872-2067(20)63554-9

Abstract

Abstract: It is extremely important for photocatalysts to exhibit intelligent responsiveness to their environment. Herein, a poly N-isopropyl acrylamide (PNIPAM)-modified Ag/Ag₃PO₄-20/CN hybrid material with excellent convertible photocatalytic activity is prepared. PNIPAM has good hydrophilicity below the lower critical solution temperature (LCST); this increases the capacity of the photocatalyst for adsorbing tetracycline (TC) molecules. In addition, the PNIPAM-modified Ag/Ag₃PO₄-20/CN can prevent the loss of Ag₃PO₄. The dispersity is improved by loading g-C₃N₄ nanosheets (CN) for enhancing the efficiency of photocatalytic activity. Furthermore, a Z-scheme heterostructure is formed between CN and Ag₃PO₄, accelerating the separation efficiency of the holes and electrons. Ag nanoparticles can be used as electron-shuttle mediators, and electrons receiving more energy are transferred via the localized surface plasmon resonance (LSPR) effect. Furthermore, the PNIPAM@Ag/Ag₃PO₄-20/CN photocatalyst exhibits an excellent degradation rate for the degradation of TC when the temperature is lower than the LCST. The photoluminescence spectra and photocurrent curves prove that the carrier-separation efficiency of PNIPAM@Ag/Ag₃PO₄-20/CN is higher than those of Ag/Ag₃PO₄/CN and CN. The main active species of·O₂^- and h⁺ are detected to reveal the plausible mechanism of the PNIPAM@Ag/Ag₃PO₄-20/CN hybrid material system. This work provides a way to develop intelligent materials for switchable photocatalytic applications.

Key words: Intelligent responsiveness, g-C₃N₄ nanosheets, Ag₃PO₄, Ag, Poly N-isopropyl acrylamide

Linlin Sun, Yaju Zhou, Xin Li, Jinze Li, Dong Shen, Shikang Yin, Huiqin Wang, Pengwei Huo, Yongsheng Yan. Thermo-responsive functionalized PNIPAM@Ag/Ag₃PO₄/CN-heterostructure photocatalyst with switchable photocatalytic activity[J]. Chinese Journal of Catalysis, 2020, 41(10): 1573-1588.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63554-9

https://www.cjcatal.com/EN/Y2020/V41/I10/1573

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Thermo-responsive functionalized PNIPAM@Ag/Ag₃PO₄/CN-heterostructure photocatalyst with switchable photocatalytic activity

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