Synthesis, characterization and activity of an immobilized photocatalyst: natural porous diatomite supported titania nanoparticles

Wang, Bin, de Godoi, Fernanda Condi, Sun, Zhiming, Zeng, Qingcong, Zheng, Shuilin and Frost, Ray L. (2015) Synthesis, characterization and activity of an immobilized photocatalyst: natural porous diatomite supported titania nanoparticles. Journal of Colloid and Interface Science, 438 204-211. doi:10.1016/j.jcis.2014.09.064

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Author Wang, Bin
de Godoi, Fernanda Condi
Sun, Zhiming
Zeng, Qingcong
Zheng, Shuilin
Frost, Ray L.
Title Synthesis, characterization and activity of an immobilized photocatalyst: natural porous diatomite supported titania nanoparticles
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 1095-7103
0021-9797
Publication date 2015-01-15
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.jcis.2014.09.064
Open Access Status
Volume 438
Start page 204
End page 211
Total pages 8
Place of publication Maryland Heights, MO United States
Publisher Academic Press
Collection year 2015
Language eng
Formatted abstract
Diatomite, a porous non-metal mineral, was used as support to prepare TiO2/diatomite composites by a modified sol–gel method. The as-prepared composites were calcined at temperatures ranging from 450 to 950 °C. The characterization tests included X-ray powder diffraction (XRD), scanning electron microscopy (SEM) with an energy-dispersive X-ray spectrometer (EDS), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption/desorption measurements. The XRD analysis indicated that the binary mixtures of anatase and rutile exist in the composites. The morphology analysis confirmed the TiO2 particles were uniformly immobilized on the surface of diatom with a strong interfacial anchoring strength, which leads to few drain of photocatalytic components during practical applications. In further XPS studies of hybrid catalyst, we found the evidence of the presence of Ti–O–Si bond and increased percentage of surface hydroxyl. In addition, the adsorption capacity and photocatalytic activity of synthesized TiO2/diatomite composites were evaluated by studying the degradation kinetics of aqueous Rhodamine B under UV-light irradiation. The photocatalytic degradation was found to follow pseudo-first order kinetics according to the Langmuir–Hinshelwood model. The preferable removal efficiency was observed in composites by 750 °C calcination, which is attributed to a relatively appropriate anatase/rutile mixing ratio of 90/10.
Keyword Diatomite
TiO2
Adsorption
Photocatalysis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online ahead of print 5 Oct 2014

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
Official Audit
School of Chemistry and Molecular Biosciences
 
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