Current time in Korea 13:10 Apr 18 (Thu) Year 2024 KCS KCS Publications
KCS Publications
My Journal  Log In  Register
HOME > Search > Browsing(BKCS) > Archives

Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 11
BKCSDE 33(11)
November 20, 2012 
 
Title
 The Effect of SiO2 Shell on the Suppression of Photocatalytic Activity of TiO2 and ZnO Nanoparticles
Author
 Min Hee Lee, Umakant Mahadev Patil, Saji Thomas Kochuveedu, Choon Soo Lee, Dong Ha Kim*
Keywords
 Key Words :TiO2@SiO2, ZnO@SiO2, Sol-gel synthesis, Photocatalysis, UV-shielding agents
Abstract
 In this study, we investigate the potential use of TiO2@SiO2 and ZnO@SiO2 core/shell nanoparticles (NPs) as effective UV shielding agent. In the typical synthesis, SiO2 was coated over different types of TiO2 (anatase and rutile) and ZnO by sol-gel method. The synthesized TiO2@SiO2 and ZnO@SiO2 NPs were characterized by UV-Vis, XRD, SEM and TEM. The UV-vis absorbance and transmittance spectra of core@shell NPs showed an efficient blocking effect in the UV region and more than 90% transmittance in the visible region. XRD and SAED studies confirmed the formation of amorphous SiO2 coated over the TiO2 and ZnO NPs. The FESEM and TEM images shows that coating of SiO2 over the surface of anatase, rutile TiO2 and ZnO NPs resulted in the increase in particle size by ~30 nm. In order to study the UV light shielding capability of the samples, photocatalytic degradation of methylene blue dye on TiO2@SiO2 and ZnO@SiO2 NPs was performed. Photocatalytic activity for both types of TiO2 NPs was partially suppressed. In comparison, the photocatalytic activity of ZnO almost vanished after the SiO2 coating.
Page
 3767 - 3771
Full Text
 PDF

How to access to the WOL for The Bulletin of the Korean Chemical Society ?

The Bulletin of the Korean Chemical Society will be co-published with Wiley-VCH from 2015 towards. The online version of the Journal will thus be available on Wiley Online Library, Wiley(-VCH)'s global online platform.

KCS members can get a free online access to the Bulletin of the Korean Chemical Society in WOL.

Close