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Volume 13
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10.3390/separations13010030
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Study on the Performance of Bi2O3/BiOBrγIx Adsorptive Photocatalyst for Removal of 2,4-Dichlorophenoxyacetic Acid

by
Rixiong Mo
1,
Yuanzhen Li
1,
Bo Liu
1,
Yi Yang
2,
Yaoyao Zhou
1,
Yuxi Cheng
2,
Haorong Shi
2 and
Guanlong Yu
2,*
1
CCCC Guangzhou Dredging Co., Ltd., Guangzhou 524557, China
2
School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China
*
Author to whom correspondence should be addressed.
Separations 2026, 13(1), 30; https://doi.org/10.3390/separations13010030
Submission received: 21 November 2025 / Revised: 24 December 2025 / Accepted: 9 January 2026 / Published: 14 January 2026
Versions Notes

Abstract

In this study, a novel Bi2O3/BiOBr0.9I0.1 (BO0.9−BBI0.1) composite photocatalyst was successfully synthesized via a single-pot solvothermal method for the efficient degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) under visible light. The structure, morphology, and optical properties of the photocatalyst were characterized through X-ray diffraction (XRD), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), UV–vis diffuse reflectance spectra (DRS), Steady-state photoluminescence (PL), and Electrochemical Impedance Spectroscopy (EIS). The composite exhibits a 3D hierarchical morphology with increased specific surface area and optimized pore structure, enhancing pollutant adsorption and providing more active sites. Under visible light irradiation, BO0.9−BBI0.1 achieved a 92.4% removal rate of 2,4-D within 2 h, with a reaction rate constant 5.3 and 4.6 times higher than that of pure BiOBr and BiOI, respectively. Mechanism studies confirm that photogenerated holes (h+) and superoxide radicals (·O2−) are the primary active species, and the Z-scheme charge transfer pathway significantly promotes the separation of electron-hole pairs while maintaining strong redox capacity. The catalyst also demonstrated good stability over multiple cycles. This work provides a feasible dual-modification strategy for designing efficient bismuth-based photocatalysts for pesticide wastewater treatment.
Keywords: BiOBr; photocatalysis; solid solution; 2,4-dichlorophenoxyacetic acid; heterojunction BiOBr; photocatalysis; solid solution; 2,4-dichlorophenoxyacetic acid; heterojunction

Share and Cite

MDPI and ACS Style

Mo, R.; Li, Y.; Liu, B.; Yang, Y.; Zhou, Y.; Cheng, Y.; Shi, H.; Yu, G. Study on the Performance of Bi2O3/BiOBrγIx Adsorptive Photocatalyst for Removal of 2,4-Dichlorophenoxyacetic Acid. Separations 2026, 13, 30. https://doi.org/10.3390/separations13010030

AMA Style

Mo R, Li Y, Liu B, Yang Y, Zhou Y, Cheng Y, Shi H, Yu G. Study on the Performance of Bi2O3/BiOBrγIx Adsorptive Photocatalyst for Removal of 2,4-Dichlorophenoxyacetic Acid. Separations. 2026; 13(1):30. https://doi.org/10.3390/separations13010030

Chicago/Turabian Style

Mo, Rixiong, Yuanzhen Li, Bo Liu, Yi Yang, Yaoyao Zhou, Yuxi Cheng, Haorong Shi, and Guanlong Yu. 2026. "Study on the Performance of Bi2O3/BiOBrγIx Adsorptive Photocatalyst for Removal of 2,4-Dichlorophenoxyacetic Acid" Separations 13, no. 1: 30. https://doi.org/10.3390/separations13010030

APA Style

Mo, R., Li, Y., Liu, B., Yang, Y., Zhou, Y., Cheng, Y., Shi, H., & Yu, G. (2026). Study on the Performance of Bi2O3/BiOBrγIx Adsorptive Photocatalyst for Removal of 2,4-Dichlorophenoxyacetic Acid. Separations, 13(1), 30. https://doi.org/10.3390/separations13010030

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