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Photocatalysis by morphologically tailored mesoporous silica (SBA-15) embedded with SnO2 nanoparticles: Experiments and model

Paper ID Volume ID Publish Year Pages File Format Full-Text
39123 45807 2015 10 PDF Available
Title
Photocatalysis by morphologically tailored mesoporous silica (SBA-15) embedded with SnO2 nanoparticles: Experiments and model
Abstract

•Different morphologies of SBA-15 particles were synthesized by the same method.•Sphere-like SBA-15 with SnO2 nanoparticles showed the highest photocatalysis.•New pore-level model developed has identified best host for catalysis reactions.

Commonly obtained SBA-15 particles (fiber-like morphology), if used as a catalyst-host, has limitations in diffusion of reactant molecules (e.g. of a dye) inside the pores of the SBA-15 particle. The systematic synthetic approach developed here provides an easy control of SBA-15 particle morphology over a wide range (fiber, rod, and sphere), by only varying the HCl concentration. To assess its effect on molecular diffusion and reaction inside pores, SnO2 nanoparticles of 3.5 nm diameter were synthesized in situ, inside the 6.3 nm diameter pores of SBA-15. These hybrids were tested for photocatalytic degradation of rhodamine B dye. Sphere-like morphology of SBA-15 with SnO2 nanoparticle loading of 17.7 wt% showed the highest first-order degradation rate constant of 0.54 h−1, compared to other morphologies (rod—0.51 h−1, fiber—0.33 h−1). On incorporating rates of diffusion, adsorption, and degradation-reaction of the dye in a single pore-level mathematical model of the SBA-15 particle, we have predicted the experimentally measured temporal variation of dye concentration for different SBA-15 morphologies and SnO2-catalyst loadings. Therefore, the present work identifies the best SBA-15 particle morphology (sphere-like) for such reactions and provides a validated model to optimize such coupled problems of chemical transport and reaction.

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Keywords
Mesoporous silica; Morphology; Tin oxide; Rhodamine B; Photocatalysis; Dye degradation; Model
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 498, 5 June 2015, Pages 107–116
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