Microwave assisted aqueous synthesis of organosilane treated mesoporous Si@ZnO nano architectures as dual-functional, photocatalysts

Autor: Vazhayal Linsha, M. Kiran, S. Anas, A. Peer Mohamed, K.B. Babitha, Solaiappan Ananthakumar
Rok vydání: 2015
Předmět:
Zdroj: Journal of Environmental Chemical Engineering. 3:1337-1345
ISSN: 2213-3437
DOI: 10.1016/j.jece.2014.12.010
Popis: A facile aqueous synthesis has been reported for the preparation of organosilane treated ZnO nano architectures (Si@ZnO) via microwave strategy. An in-situ addition of 3-aminopropyl trimethoxy silane (APTMS) resulted in the formation of polysiloxane network that effectively controlled the exaggerated growth of ZnO finally produced high surface area, mesoporous Si@ZnO nano clusters. The formation of a polysiloxane network was confirmed from the FTIR analysis. Reduction in the crystallite size was verified from the powder X-ray diffraction and TEM analyses. Silane treated ZnO shows highly stable dispersion, in aqueous medium. The quantum confinement effect of size controlled Si@ZnO was confirmed from the blue shift in UV–vis absorption spectra. As a function of APTMS concentration both surface charge and surface area was found to enhance from (−12) to (+35.5) mV and 18 to 80 m2 g−1, respectively. Such positively charged Si@ZnO nano architectures showed property highly receptive to anionic dyes for the adsorption as well as photodegradation. In this study, size controlled, surface engineered, dual-functional photoactive adsorbent is successfully designed which is potentially useful for the recovery and recycling of dye contaminated water.
Databáze: OpenAIRE
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