期刊
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
卷 11, 期 5, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2023.110558
关键词
Polyoxometalates; Facetengineered-TiO2; C-C bond cleavage; Photocatalysts; Lignin model compound
Selective cleavage of C-C bond of lignin derivatives and models via oxidation is achieved using P2W17V/{001}-TiO2 heterogenous photocatalysts. The photocatalysts effectively transform lignin model compound to benzaldehyde and phenol, with a selectivity above 85%. This study provides a new approach to selectively break C-C bond in lignin under mild conditions.
Selective cleavage of C-C bond of lignin derivatives and models via oxidation is vital to realize value-added utilization of lignocellulosic biomass. Herein, based on the strategy of facet engineering and pseudo-heterojunction construction, a series of P2W17V/{001}-TiO2 heterogenous photocatalysts were constructed by loading monovanadium-substituted Dawson-type polyoxometalates P2W17V onto TiO2 with exposed {001} fac-ets. The morphologies, structures, photoelectrical properties, and photocatalytic performances of the nano -composites were researched. P2W17V/{001}-TiO2 could effectively photocatalyze the transformation of 2-phenoxy-1-phenylethanol, the lignin model compound with characteristic & beta;-O-4 structure, to benzaldehyde and phenol. Photogenerated electrons and O2 & BULL;-were disclosed critical to lignin model conversion that could induce C-C bond cleavage, with a selectivity above 85%, through a C & beta;-centered radical. Neither pure O2 nor precious metal was required in the photocatalysis. P2W17V acted as electron pools. The engineered facets of TiO2 and the pseudo-heterojunction between P2W17V and TiO2 suppressed electron-hole recombination, facilitated charge transfer, and promoted photocatalytic performance. This work paved a new avenue to convert lignin and lignin derivatives to high-value chemicals by selectively breaking C-C bond under mild conditions.
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