CONSTRUCTION AND PHOTOCATALYTIC PERFORMANCE OF CARBON-DOPED FLOWER SPHERICAL Bi4O5Br1.87Cl0.13

PENG Lingzhi; LIU Jia; YANG Yang; TANG Senpei

doi:10.13205/j.hjgc.202305017

Volume 41 Issue 5

May 2023

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PENG Lingzhi, LIU Jia, YANG Yang, TANG Senpei. CONSTRUCTION AND PHOTOCATALYTIC PERFORMANCE OF CARBON-DOPED FLOWER SPHERICAL Bi₄O₅Br_1.87Cl_0.13[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(5): 125-133,171. doi: 10.13205/j.hjgc.202305017

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CONSTRUCTION AND PHOTOCATALYTIC PERFORMANCE OF CARBON-DOPED FLOWER SPHERICAL Bi₄O₅Br_1.87Cl_0.13

doi: 10.13205/j.hjgc.202305017

School of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China

Received Date: 2022-07-15

Abstract

Abstract

Bismuth halide oxide based photocatalytic materials have made rapid progress in recent years due to their excellent photocatalytic performace. In this project, in order to develop effective visible light responsive BiOX based photocatalyst, carbon-doped micro and nano-flower spherical solid solution (Bi₄O₅Br_1.87Cl_0.13) were successfully synthesized by combining the hydrothermal method and annealing treatment, with tetracycline hydrochloride as the chlorine and carbon sources. TEM, SEM, XPS, XRD and other analytical techniques were used to characterize its micro morphology, chemical structure, photoelectrochemical properties, and photocatalytic degradation performance. The results showed that Bi₄O₅Br_1.87Cl_0.13 was a spherical morphology of nanosheet assembly, in which the introduction of chlorine and carbon elements induced a high degree of hybridization in the valence and conduction band orbitals, resulting in a certain impurity energy level. This impurity energy level enhanced the absorption of visible light by the catalyst, while providing a channel for charge transport and promoting charge separation. Moreover, Bi₄O₅Br_1.87Cl_0.13 had a narrower forbidden bandwidth compared to the unmodified Bi₄O₅Br₂, which meant that a higher electron-hole excitation efficiency obtained in visible light. The Bi₄O₅Br_1.87Cl_0.13-300 with a carbon doping of 3.58% (mass fraction) was obtained by annealing at 300 ℃ with the most excellent photocatalytic performance. The degradation of methyl orange (10 mg/L) by Bi₄O₅Br_1.87Cl_0.13-300 could reach 88.29% in one hour under the light of 35 W halogen lamp, while the degradation of methyl orange by Bi₄O₅Br₂ under the same conditions was only 28.53%. The stepwise degradation study showed that the excellent photocatalytic degradation performance of Bi₄O₅Br_1.87Cl_0.13-300 mainly came from the nanosheet-like multistage structure on the spherical surface, which provided a large number of surface sites involved in the reaction. The present work provided a new reference for the enhancement of the photocatalytic performance of bismuth halide oxide materials.
- micro- and nano-flower spherical solid solution,
- visible light catalysis,
- bismuth halide oxide,
- carbon doping

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