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Saturday, 15 October 2016
Extraction and physical characterization of amorphous silica made from corn cob ash at variable pH conditions via sol gel processing
Published Date 25 October 2015, Vol.30:249–253,doi:10.1016/j.jiec.2015.05.029 Author
Jaehong Shim a
Palanivel Velmurugan b
Byung-Taek Oh b,,
aSchool of Natural Resources, University of Nebraska-Lincoln, Lincoln, NE 68583-0817, USA
bDivision of Biotechnology, Advanced Institute of Environment and Bioscience, College of Environmental and Bioresource Sciences, Chonbuk National University, Iksan 570-752, Jeonbuk, South Korea
Received 2 March 2015. Revised 27 May 2015. Accepted 30 May 2015. Available online 5 June 2015.
Herein, we disclose a novel approach for the synthesis of nano-silica using corn cob ash (CCA). Also, we identify that silica is amorphous at pH 7 and crystalline at pH 10 at the critical salt concentration for monovalent NaOH. A zeta potential study was used to characterize the surface charge of nanoparticles. The silica nanoparticles were characterized by SEM-EDS, XRD, FTIR, TEM and XRD confirmed the crystalline nature and TEM images showed spherical silica nanoparticles. Brunauer–Emmett–Teller, cation exchange capacity, and N2 analyses showed excellent support material for catalysis at pH 7. The CCA-mediated synthesized particles showed excellent stability at pH 7.