Iodine doped Z-scheme Bi2O2CO3/Bi2WO6 photocatalysts: Facile synthesis, efficient visible light photocatalysis, and photocatalytic mechanism

Abstract

The Bi-based hierarchical multi-component photocatalytic system is an important player in energy and environmental catalysis due to its full-spectrum light absorption and stable separation of photo-generated charges. In this study, a novel family of iodine doped Bi2O2CO3/Bi2WO6 heterojunctions was successfully developed by a facile ionic liquid assisted solvothermal method. A visible light photocatalytic H2 production rate of 664.5 μmol g -1 h -1 (0.3I-Bi2O2CO3/Bi2WO6 with 3% Pt) has been durably obtained, much higher than those of pristine and undoped counterparts. The photocatalysts are also capable for persistent pollutant and dye degradation. Through electrochemical and spectroscopic tests and density functional theory calculation, the enhanced photocatalytic activity is attributed to formation of the Z-scheme photocatalyst. Therein, the lowered and indirect bandgap and heterojunctional band alignment spontaneously benefit visible light harvesting, electron-hole pair separation, and proton reduction. Besides a facile synthesis for effective photocatalysis, the Z-scheme mechanism is hoped to facilitate the design and realization of similar systems for photocatalytic H2 evolution and organic hazards decontamination.

Synthesis of CdS-loaded (CuC10H26N6)3(PW12O40)2 for enhanced photocatalytic degradation of tetracycline under simulated solar light irradiation

“…The charge recombination is substantially inhibited on the CuPW-CdS-10. 51 PL, photocurrent and EIS are well consistent with the result of photocatalytic degradation experiment.…”

Harnessing photo/electro-catalytic activityvianano-junctions in ternary nanocomposites for clean energy

“…Whereas, VB holes of semiconductor (1) are usually involved in a water oxidation reaction. 94 It is to be noted that this clear distinction of various mechanisms is made for binary nanocomposites, wherein both the components used are semiconductors and usually take part in the generation of charge carrier (type-II, S-scheme). Whereas when it comes to ternary nanocomposites, three different components are involved with mainly one active component (i.e., semiconductor to generate charge carriers upon light irradiation) and two supportive (cocatalyst) components.…”

Facile In–Situ Construction of Granular–Polyhedral Ag2O–Ag2CO3/Lamellar Bi2O2CO3–Bi2MoO6 Spherical Heterojunction with Enhanced Photocatalytic Activity Towards Pollutants

“…Bismuth-based semiconductors are identi ed as one of the most promising materials for photocatalysis, which is due to their suitable energy band structure and low price [8][9][10]. Among them, the layered bibase materials have received much concern owing to their unique structural advantages and fast photogenerated electron-hole (e − -h + ) pair separation ability.…”