4.7 Article

Hierarchical polypyrrole encapsulating Bi2O4 to enhance charge separation and light absorption with boosted visible light photocatalytic activity

Journal

CERAMICS INTERNATIONAL
Volume 47, Issue 8, Pages 10574-10581

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.12.169

Keywords

Bi2O4; Polypyrrole; Hierarchical structure; Heterojunction; Photocatalysis

Funding

  1. National Natural Science Foundation of China [21663012]
  2. Natural Science Foundation of Jiangxi Province [20181BAB203009]

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Hierarchical polypyrrole encapsulated Bi2O4 has been constructed to enhance visible light photocatalytic activity through improving charge separation efficiency and light absorption capacity. The optimal Bi2O4@PPy composite showed 2.43 times higher catalytic activity compared to Bi2O4 alone, with holes playing a vital role in the photocatalytic degradation process. The proposed reaction mechanism is based on characterization and experimental results.
Bi2O4, as a typical visible-light responsive photocatalyst (band gap similar to 2.0 eV), has aroused enormous attention in recent years. However, single Bi2O4 has the problem of high recombination probability of photogenerated electron-hole pairs, which inevitably hampers its photocatalytic performance. Herein, hierarchical polypyrrole encapsulated Bi2O4(Bi2O4@PPy) has been constructed via an in-situ vapor-phase polymerization method, producing PPy tightly coated Bi2O4 core-shell structure photocatalyst. Thanks to this full coating and hierarchical structure, the charges separation efficiency, and the light absorption capacity of Bi2O4@PPy hybrid are promoted, leading to obviously enhanced visible light photocatalytic activity. The optimal Bi2O4@PPy composite could be obtained through controlling the polymerization time for 9 h, whose catalytic activity is as 2.43 times as that of Bi2O4 alone. The active species trapping experiments suggest that holes play a vital role in the photo catalytic degradation process. A plausible reaction mechanism over the Bi2O4@PPy hybrid photocatalyst is also proposed based on the characterization and experimental results.

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