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The three-dimensionally ordered microporous CaTiO 3 coupling Zn 0.3 Cd 0.7 S quantum dots for simultaneously enhanced photocatalytic H 2 production and glucose conversion.

Authors :
Bai FY
Han JR
Chen J
Yuan Y
Wei K
Shen YS
Huang YF
Zhao H
Liu J
Hu ZY
Li Y
Su BL
Source :
Journal of colloid and interface science [J Colloid Interface Sci] 2023 May 15; Vol. 638, pp. 173-183. Date of Electronic Publication: 2023 Jan 27.
Publication Year :
2023

Abstract

Glucose conversion assisted photocatalytic water splitting technology to simultaneously produce H <subscript>2</subscript> and high value-added chemicals is a promising method for alleviating the energy shortage and environmental crisis. In this work, we constructing type II heterojunction by in-situ coupling Zn <subscript>0.3</subscript> Cd <subscript>0.7</subscript> S quantum dots (ZCS QDs) on three-dimensionally ordered microporous CaTiO <subscript>3</subscript> (3DOM CTO) for photocatalytic H <subscript>2</subscript> production and glucose conversion. The DFT calculations demonstrate that substitution of Zn on the Cd site improves the separation and transmission of photogenerated carriers. Therefore, 3DOM CTO-ZCS composite exhibits best H <subscript>2</subscript> production performance (2.81 mmol g <superscript>-1</superscript> h <superscript>-1</superscript> ) and highest apparent quantum efficiency (AQY) (5.56 %) at 365 nm, which are about 47 and 18 times that of CTO nanoparticles (NPs). The improved catalytic performance ascribed to not only good mass diffusion and exchange, highly efficient light harvesting of 3DOM structure, but also the efficient charges separation of type Ⅱ heterojunction. The investigation on photocatalytic mechanism indicates that the glucose is mainly converted to gluconic acid and lactic acid, and the control reaction step is gluconic acid to lactic acid. The selectivity for gluconic acid on 3DOM CTO-ZCS is 85.65 %. Our work here proposes a green sustainable method to achieve highly efficient H <subscript>2</subscript> production and selective conversion of glucose to gluconic acid.<br />Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2023 Elsevier Inc. All rights reserved.)

Details

Language :
English
ISSN :
1095-7103
Volume :
638
Database :
MEDLINE
Journal :
Journal of colloid and interface science
Publication Type :
Academic Journal
Accession number :
36736118
Full Text :
https://doi.org/10.1016/j.jcis.2023.01.123