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Modified side-chain COFs construct built-in electric fields with low exciton binding energy for photo-reduced uranium by Xin Zhong; Qian Ling; Peiling Kuang; Baowei Hu is a Engineering article available to read on EtoBox.

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Photoreduction of uranium(U) is recognized as an effective U-enrichment method that converts soluble U(VI) into insoluble U(IV). However, deficient exciton dissociation and low charge mobility in COFs limit their photocatalytic activity. Excitonic dissociation and charge transfer in COFs could be regulated by grafting different polar functional groups, but the relevant studies are still insufficient. In this work, we constructed a series of donor-acceptor (D-A) COFs (TpBD-X, X = -OH, NH 2 , -OCH 3 , -NO 2 , -SO 3 H) materials with electric built-in fields by different functional groups for U(VI) adsorption-photoreduction. The research results showed that, due to the introduction of functional groups, the exciton dissociation energy was decreased to 22.91 m⋅eV, the carrier lifetime was prolonged to 3.109 ns, light-absorption capacity was significantly improved, the forbidden bandwidth was reduced and the carrier transfer impedance was lowered. Thereby, the U(VI) reduction efficiency was enhanced from TpBD (33.34 %) to TpBD-(NO 2 ) 2 (73.11 %), and the corresponding reduction reaction rate constants were 1.40-5.58 times higher than that of TpBD, among which TpBD-(OH) 2 and TpBD-(NO 2

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Author

Xin Zhong; Qian Ling; Peiling Kuang; Baowei Hu

Publisher

Elsevier BV

Published

2024

Language

EN

Field

Engineering (Physical Sciences)