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Nanoscale β-Sn1−nWO4·nα-Sn—A highly efficient photocatalyst for daylight-driven degradation of organic dyes and its real “green” synthesis

Paper ID Volume ID Publish Year Pages File Format Full-Text
47117 46459 2011 6 PDF Available
Title
Nanoscale β-Sn1−nWO4·nα-Sn—A highly efficient photocatalyst for daylight-driven degradation of organic dyes and its real “green” synthesis
Abstract

The unique phase composition β-Sn1−nWO4·nα-Sn, including nanoscale incipient crystalline β-SnWO4 and α-Sn, turned out to be a very promising photocatalyst under simulated daylight. Since the nanomaterial is gained via a quick and simple precipitation in water without using toxic elements or solvents, the synthesis can be regarded as real “green”. Despite its simple preparation, the nanoparticles are of high quality, exhibiting an average diameter of 20 nm, a low degree of agglomeration, a high specific surface (71 m2 g−1) and an efficient electrostatic stabilization (ζ < −40 mV at pH = 3.5–9.5). As-prepared β-Sn1−nWO4·nα-Sn exhibits a strong absorption in the visible spectral range (554 nm, 2.2 eV) and a lasting high photocatalytic performance under simulated daylight. Various organic dyes (phenothiazine dye methylene blue, triphenylmethane dye basic green 4, azo-dye methyl red) are decomposed with significantly higher degradation rates (5–10) as compared to commercially available Degussa P25 (TiO2, 80% anatase, 20% rutile). Recycling experiments prove the phase stability and reusability of as-prepared β-Sn1−nWO4·nα-Sn.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Composite photocatalyst β-Sn1−nWO4·nα-Sn consisting of incipient crystalline β-SnWO4 and α-Sn. ▶ Simple water-based synthesis at ambient temperature. ▶ 20 nm sized nanoparticles with high specific surface and electrostatic stabilization. ▶ Photocatalytic activity under simulated daylight 5–10 times higher than TiO2. ▶ Recycling experiments prove reusability and stability.

Keywords
Tin tungstate; Tin; Nanoparticle; Photocatalysis; Daylight-driven; Green synthesis
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Nanoscale β-Sn1−nWO4·nα-Sn—A highly efficient photocatalyst for daylight-driven degradation of organic dyes and its real “green” synthesis
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 102, Issues 3–4, 22 February 2011, Pages 515–520
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