期刊
CATALYSIS TODAY
卷 375, 期 -, 页码 472-483出版社
ELSEVIER
DOI: 10.1016/j.cattod.2020.06.015
关键词
PbBiO2I; g-C3N4; Crystal violet; 2-Hydroxybenzoic acid; Composites; Photocatalysis
资金
- Ministry of Science and Technology of the Republic of China [MOST1082113M142001]
The study investigates the performance of PbBiO2I/g-C3N4 photocatalysts, demonstrating their high catalytic activity in degrading crystal violet and 2-hydroxybenzoic acid. The reactive O2 center dot plays a major role in crystal violet degradation.
An ecofriendly and cheap photocatalyst is crucial for realizing practical photocatalysis applications. Many inorganic materials have modular structures in which individual units are responsible for different functions. [Bi2O2]2+ slabs with an alpha-PbO-type structure and simple halide layers are effective spacers in some layered functional materials. Previous reports have mainly discussed electronic reasons for the different photocatalytic activities of layered PbBiO2X-type materials (X = Cl, Br, I). To the best of our knowledge, nanocomposite semiconductors consisting of PbBiO2I/g-C3N4 have not been reported in the literature. In this study, PbBiO2X/gC3N4 composites were isolated and characterized by FE-SEM-EDS, XRD, HR-XPS, TEM, PL, BET, FT-IR, and UV-vis-DRS. By degrading crystal violet (CV) and 2-hydroxybenzoic acid (HBA) in an aqueous solution under visible-light irradiation, the photocatalytic activities of PbBiO2I/g-C3N4 are discussed further. In particular, the catalytic performance illustrates the best reaction rate constants of 0.3259 h- 1 using the PbBiO2I/g-C3N4 composite as the photocatalysts; these are 13.7 and 9.1 times higher than those of PbBiO2I and g-C3N4, respectively. The quenching effects of different scavenger results demonstrate that reactive O2 center dot plays the major role and center dot OH, h+, and 1O2 play the minor role in CV degradation.
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