Bismuth-rich oxyhalide (Bi7O9I3?Bi4O5Br2) solid-solution photocatalysts for the degradation of phenolic compounds under visible light

Chachvalvutikul, Auttaphon, Luangwanta, Tawanwit, Inceesungvorn, Burapat and Kaowphong, Sulawan 2023. Bismuth-rich oxyhalide (Bi7O9I3?Bi4O5Br2) solid-solution photocatalysts for the degradation of phenolic compounds under visible light. Journal of Colloid and Interface Science 641 , pp. 595-609. 10.1016/j.jcis.2023.03.063

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Abstract

Hypothesis: The development of solid-solution photocatalysts with tunable bandgaps and band struc- tures, which are significant factors that influence their photocatalytic properties, is crucial. Experiments: We fabricated a series of novel bismuth-rich Bi7O9I3–Bi4O5Br2 solid-solution photocatalysts with controlled I:Br molar ratios (denoted as B-IxBr1-x, x = 0.2, 0.3, 0.4, or 0.6) via a rapid, facile, and energy- efficient microwave-heating route. The photodegradations under visible-light irradiation of the phenolic compounds (4-nitrophenol (4NP), 3-nitrophenol (3NP), and bisphenol A (BPA)), and the simultaneous photodegradation of BPA and rhodamine B (RhB) in a coexisting BPA ? RhB system were investigated. Findings: The B-I0.3Br0.7 solid solution provided the highest photocatalytic activity toward 4NP degrada- tion, with degradation rates 32 and 4 times higher than those of Bi7O9I3 and Bi4O5Br2, respectively. The photodegradation efficiency of the studied phenolic compounds followed the order BPA (97.5%) > 4NP (72.8%) > 3NP (27.5%). The RhB-sensitization mechanism significantly enhanced the photodegradation efficiency of BPA. Electrochemical measurements demonstrated the efficient separation and migration of charge carriers in the B-I0.3Br0.7 solid solution, which enhanced the photocatalytic activity. The B- I0.3Br0.7 solid solution effectively activated molecular oxygen to produce ?O2 ?, which subsequently pro- duced other reactive species, including H2O2 and ?OH, as revealed by reactive-species trapping, nitroblue tetrazolium transformation, and o-tolidine oxidation experiments.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	0021-9797
Date of First Compliant Deposit:	16 April 2024
Date of Acceptance:	9 March 2023
Last Modified:	09 Nov 2024 18:30
URI:	https://orca.cardiff.ac.uk/id/eprint/167991

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