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TiO2 mesocrystal with exposed (001) facets and CdS quantum dots as an active visible photocatalyst for selective oxidation reactions

Paper ID Volume ID Publish Year Pages File Format Full-Text
45093 46396 2016 7 PDF Available
Title
TiO2 mesocrystal with exposed (001) facets and CdS quantum dots as an active visible photocatalyst for selective oxidation reactions
Abstract

•Combined solvothermal alcoholysis and subsequent ion-exchange.•Mesoporous single-crystal TiO2 (mesocrystal) with exposed (001) facets.•CdS quantum dots decoration.•Selective alcohol oxidation via visible light induced photocatalysis.•Synergetic effect of photosensitization and heterojunction.

CdS quantum dots decorated TiO2 mesocrystals with exposed (001) facets were synthesized by solvothermal alcoholysis and subsequent ion-exchange. The as-prepared photocatalyst exhibited high activity and selectivity in selective oxidations of various alcohols to their corresponding aldehydes under visible light irradiation. The high photocatalytic efficiency could be ascribed to the CdS quantum dots with enhanced photosensitizing effect and CdS-TiO2 heterojunction, the mesoporous structure with high surface area, and the exposed (001) facets with high surface energy and large number of oxygen vacancies, which promoted the light-harvesting, photocatalyst activation by visible lights, photoelectron-hole separation, reactant molecule adsorption and activation. Moreover, it also showed strong durability owing to the excellent stability against structural collapse and either CdS leaching or CdS corrosion.

Graphical abstractCdS quantum dots decorated TiO2 mesocrystal with exposed (001) facets was synthesized via solvothermal alcoholysis and subsequent ion-exchange. It exhibited high activity and stability in visible photocatalysis for selective alcohol oxidations owing to photosensitizing effect of CdS quantum dots, CdS-TiO2 heterojunction, mesoporous structure with high surface area, exposed (001) facets with high surface energy and large number of oxygen vacancies.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
TiO2 mesocrystals; Exposed (001) facets; CdS quantum dots; Visible photoactivity; Selective oxidation reactions
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TiO2 mesocrystal with exposed (001) facets and CdS quantum dots as an active visible photocatalyst for selective oxidation reactions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 187, 15 June 2016, Pages 115–121
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us