Silica Content and Structure from Corncob Ash with Various Acid Treatment (HCl, HBr, and Citric Acid)

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Gladys Ayu Paramita Kusumah Wardhani, Nurlela Nurlela, Mia Azizah


In this study, a simple method to obtain silica from corncob ash has been investigated using a nonthermal and thermal method. The Nonthermal method was done by various acid treatment with HCl, HBr and citric acid at room temperature. Thermal method was performed for HCl-leached, HBr-leached, and citric acid-leached corncob in the furnace at 750 ºC for 5 hours. Corncob ash was characterized by Energy Dispersive X-ray fluorescence spectroscopy (EDXRF), Fourier transforms infrared spectroscopy (FTIR), X-Ray diffraction (XRD), and Scanning electron microscope-electron dispersive X-ray (SEM-EDX). In this study silica content increase after acid treatment (leaching) and combustion at high temperatures. The result established that silica is most obtained with HCl treatment that is equal to 79,95% with lower metallic oxide impurity content. The FTIR spectra with different intensity shows silanol group at 1636 – 1641 cm-1, whereas siloxane group at 1037 – 1106 cm-1, 616–797 cm-1, and 459–469 cm-1. X-Ray diffractogram shows silica transition pf amorphous (2θ = 21 - 25º) to quartz crystalline (2θ = 26.66º) phase. The surface morphology of silica that characterized with SEM-EDX shows amorphous and crystalline silica corresponds to XRD result. The high intensity spectra of Si and O in EDX shows the presence of silica in corncob ash.


corncob ash, silica, acid treatment


Adesanya, D.A., and Raheem, A., 2009, Development of corncob ash blended cement, Construction and Building Materials, 23 (1) : 347–352, doi:10.1016/j.conbuildmat.2007.11.013.

Adesanya, D.A. and Raheem, A., 2010, A study of the permeability and acid attack of corncob ash blended cements, Construct. Build. Materials, 24 : 403-409, doi: 10.1016/j.conbuildmat.2009.02.001.

Amin, N., Khattak, S., Noor, S., and Ferroze, I., 2016, Synthesis and characterization of silica from bottom ash of sugar industry, Journal of Cleaner Production, 117 : 207-211.

Badan Pusat Statistik (BPS), 2015, Produksi Jagung Menurut Provinsi (ton), 1993-2015,, diakses 7 Mei 2016, pkl. 11.55 WIB.

Bragmann, C.P and Goncalves, M.R.F, 2006, Thermal Insulators Made With Rice Husk Ashes: Production and Correlation BetweenProperties and Microstructure, Department of Materials, School of Engineering, Federal University of Rio Grande Do Sul, Brasil.

Chakraverty, A. And Kaleemullah, S., 1991, Conversion of rice husk into amorphous silica and combustible gas, Energy Consers. Mgmt, 32 : 565 - 570.

Chandra A., Miryanti, A., Widjaja L., dan Pramudita A., 2012, Isolasi dan karakterisasi silika dari sekam padi, Engineering Science, 12.

Della, V.P, Kühn, I., and Hotza, D., 2002, Rice husk ash as an alternate source for active silica production, Material Letters, 57 : 818 – 821.

Faizul, C.P., Abdullah, C., and Fazhul, B., 2013, Extraction of Silica from Palm Ash via Citric Acid Leaching Treatment, Advances in Environmental Biology, 7 (12) : 3690 – 3695.

Fernandes, I.J, Calheiro, D., Kieling, A.G., Moraes, C.A.M., Rocha, T.L.A.C., Brehm, F.A., Modolo, R.C.E., 2016, Fuel, 165 : 351 -359.

Hou, X.X., Deng, Q.F., Ren, T.Z., and Yuan, Z.Y., 2013, Adsorption of Cu (2+) and methyl orange from aqueous solutions by activated carbons of corncob-derived char wastes, Environ. Sci. Pollut. Res. Int., 20 : 8521-8534.

Li, Y., Wang, T., Yin, X., Wu, C., Ma, L., Li, H., Lv, Y., and Sun, L., 2010, 100 t/a Scale demonstration of direct dimethyl ether synthesis from corncob-derived syngas, Renew. Energy, 35 : 583-587.

Rafiee, E., Shabnam S., Mostafa F., Mahdi S., 2012, Optimization of Synthesis and Characterization of Nanosilica Produced from Rice Husk (a Common Waste Material), International Nano Letters, 2 (29); 2-8

Sun, Y., Wei, J., Yao, M.S., and Yang, G., 2012, Preparation of activated carbon from furfural production waste and its application for water pollutants removal and gas separation. Asia-Pac. J. Chem. Eng., 7 : 547-554.

Umeda, J. and Kondoh, K., 2008, High-purity amorphous silica originated in rice husks via carboxylic acid leaching process, Journal of Materials Science, 43 (22) : 7084-7090.

Umiyasih, U., dan Wina, E., 2008, Pengolahan dan nilai nutrisi limbah tanaman jagung sebagai pakan ternak ruminansia. Wartazoa, 18 (3) : 127-136.

Velmurugan, P., Shim, J., Lee, K.J., Cho, M., Lim , S. S., Seo, S. K., Cho, K. M., K. Bang S., and Oh, B. T., 2015, Extraction, characterization, and catalytic potential of amorphous silica from corncobs by Sol-Gel method, J. Ind. Eng. Chem, 29 (25) : 298-303.

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Jurnal Ilmiah Kimia
Department of Chemistry, Faculty of Mathematics and Natural Sciences,
Universitas Jenderal Soedirman, Purwokerto, Indonesia

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