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Ultrathin nanosheets of molecular sieve SAPO-5: A new photocatalyst for efficient photocatalytic reduction of CO2 with H2O to methane

Paper ID Volume ID Publish Year Pages File Format Full-Text
45081 46396 2016 8 PDF Available
Title
Ultrathin nanosheets of molecular sieve SAPO-5: A new photocatalyst for efficient photocatalytic reduction of CO2 with H2O to methane
Abstract

•2D SAPO-5 nanosheets with a thickness of about 3.0 nm are successfully prepared.•SAPO-5 nanosheets show superior activities for the photoreduction of CO2 into CH4.•The high activity is ascribed to ultrathin geometry and more surface active sites.•The surface CO2− is an active intermediate of CO2 reduction on SAPO-5 nanosheets.

Two-dimensional (2D) SAPO-5 nanosheets with a thickness of about 3.0 nm were fabricated successfully by a facile one-pot hydrothermal method for the first time. The structure and the physicochemical properties of the as-prepared SAPO-5 nanosheets were characterized in detail. The SAPO-5 ultrathin nanosheets have great potential applications for the highly efficient reduction of CO2 into a renewable hydrocarbon fuel. Compared with SAPO-5 microrods, the ultrathin SAPO-5 nanosheets show higher photocatalytic activity (about 6 times) for reducing CO2 into CH4. It is found that a large number of surface active sites on the nanosheets make it suitable for the catalytic reaction, and the ultrathin geometry of the nanosheets promotes the mass transfer of reactants and products. The normalized time-resolved fluorescence decay signals of the photo-induced absorption recorded from the SAPO-5 nanosheets and rod indicate that the excited state can survive longer on the nanosheets, which also contributes to its high photocatalytic activity. Meanwhile, high CO2 adsorption capacity may be one important reason for high photocatalytic activity of SAPO-5 nanosheets. The reaction intermediates are detected by in-situ FT-IR spectroscopy. Finally, a probable mechanism is proposed based on the experimental results. It is hoped that our work could facilitate the fabrication of molecular sieve materials for solar energy conversion of CO2.

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Keywords
SAPO-5; Molecular sieve; Nanosheet; CO2 reduction; Photocatalysis
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Ultrathin nanosheets of molecular sieve SAPO-5: A new photocatalyst for efficient photocatalytic reduction of CO2 with H2O to methane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 187, 15 June 2016, Pages 11–18
Authors
, , , , , , , ,
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