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Isopropanol-assisted synthesis of highly stable MAPbBr3/p-g-C3N4 intergrowth composite photocatalysts and their interfacial charge carrier dynamics

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Abstract

Two phase photocatalysts can be intergrown with each other, resulting in superior photocatalytic properties. Herein, methylamine lead bromide (MAPbBr3) wrapped/entrapped protonated graphitic carbon nitride (p-g-C3N4) intergrowth microcrystals were fabricated by mixing a pervoskite precursor with p-g-C3N4 colloidal sol. A highly stable isopropanol (IPA) solvent based photocatalytic system for dye degradation was demonstrated. The composite with an optimal p-g-C3N4 mass percentage of 3.3 wt% (denoted as MAPbBr3/p-g-C3N4-1.0 mg) exhibited the highest photocatalytic degradation of malachite green (99.8%) within 10 min under visible light, which was 5.3-fold and 16-fold greater than that exhibited by its constituents separately. The strong chemical interaction and fundamental photophysical processes in MAPbBr3/p-g-C3N4 were systematically evaluated by spectroscopic and electrochemical techniques, confirming the effective separation of photogenerated electron–hole pairs and faster interfacial charge transfer behavior. Furthermore, active superoxide radicals (O2˙) played a vital role in the catalytic reaction, because of the significant photoinduced electron transfer rate (ket) in the inverted type-I core/shell MAPbBr3/p-g-C3N4 band configuration structure. In addition, MAPbBr3/p-g-C3N4 has good cycling stability for 10 cycles and versatility for other cationic (RhB) and anionic (MO) dye pollutants, indicating the great potential for solar energy conversion into chemical energy.

Graphical abstract: Isopropanol-assisted synthesis of highly stable MAPbBr3/p-g-C3N4 intergrowth composite photocatalysts and their interfacial charge carrier dynamics

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Publication details

The article was received on 08 Oct 2019, accepted on 20 Nov 2019 and first published on 21 Nov 2019


Article type: Paper
DOI: 10.1039/C9NA00634F
Nanoscale Adv., 2020, Advance Article
  • Open access: Creative Commons BY-NC license
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    Isopropanol-assisted synthesis of highly stable MAPbBr3/p-g-C3N4 intergrowth composite photocatalysts and their interfacial charge carrier dynamics

    Q. Wang, S. Yu, W. Qin and X. Wu, Nanoscale Adv., 2020, Advance Article , DOI: 10.1039/C9NA00634F

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