Burcu KARAKUZU, Tülay Merve TEMEL, Sevil YÜCEL, Pınar TERZİOĞLU, Yeliz ELALMIŞ

EFFECT OF ACID TYPE AND GELATION pH ON THE STRUCTURAL PROPERTIES OF SILICA AEROGELS PREPARED BY USE OF RICE HULL BIOSILICA

In this study, the experimental results of the surface area, morphology, and density of silica aerogels obtained at different preparation conditions are reported. The aerogels have been produced by sol-gel process followed by ambient pressure drying. Rice hull ash silicate solution was used as an inexpensive precursor. The type of acids and gelation pH has strongly affected the structural properties of the final products. The silica aerogels have a well-developed nanoporous structure and a high specific surface area. The densities, pore sizes and specific surface areas of the silica aerogels were in the range of 0.273-0.849 g cm-3, 3.24-10.22 nm, and 238-726 m2g-1, respectively.

Keywords:

Ambient pressure drying, rice hull, silica aerogel.,

PDF

___

[1] Wang J., Zhou Q., Song D., et.al., “Chitosan–silica composite aerogels: preparation, characterization and Congo red adsorption”, J Sol-Gel Sci Technol, 76,501–509, 2015.
[2] Pierre A.C., Pajonk G.M. “Chemistry of aerogels and their applications”. Chem Rev., 102, 11, 4243–4265, 2002.
[3] Yücel S., Terzioğlu P., Aydın-Sinirlioğlu Z., et al., “Synthesis, Characterization, In Vitro Degradability and Bioactivity of Strontium Substituted Rice Hull Ash Silica Based Melt Derived 45S5 Bioactive Glass”, Journal of Engineering and Natural Sciences, Sigma 33, 23-32, 2015.
[4] Tzong-Horng L., Chun-Chen Y., “Synthesis and surface characteristics of nanosilica produced from alkali-extracted rice husk ash”, Mater. Sci. Eng., B, 176, 521–529, 2011.
[5] Shi F., Wang L., Liu J., “Synthesis and characterization of silica aerogels by a novel fast ambient pressure drying process”, Mater Lett, 60, 29–30, 3718–3722, 2006.
[6] Shewale P. M., Rao A. V., Rao A. P., “Effect of different trimethyl silylating agents on the hydrophobic and physical properties of silica aerogels”, App Surface Sci, 254, 6902–6907, 2008.
[7] Tadjarodi A., Haghverdi M., Mohammadi V., “Preparation and characterization of nano-porous silica aerogel from rice husk ash by drying at atmospheric pressure”, Mater. Res. Bull., 47, 2584–2589, 2012.
[8] Leofanti G., Padovan M., Tozzola G., et al., “Surface area and pore texture of catalysts”, Catal. Today, 41, 207–219, 1998.
[9] Bhagat S.D., Kim Y.H., Moon M.J., et al., “A cost-effective and fast synthesis of nanoporous SiO2 aerogel powders using water-glass via ambient pressure drying route”, Solid State Sci., 9, 628–635, 2007.
[10] Yan X. X., Deng H. X., Huang X. H., et al., “Mesoporous bioactive glasses. I. Synthesis and structural characterization”, J. Non-Cryst. Solids, 351, 40, 3209-3217, 2005.
[11] Sinkó K., “Influence of Chemical Conditions on the Nanoporous Structure of Silicate Aerogels”, Materials, 3, 704-740, 2010.
[12] Lee S., Cha Y. C., Hwang H. J., et al., “The effect of pH on the physicochemical properties of silica aerogels prepared by an ambient pressure drying method”, Mater Lett, 61, 3130–3133, 2007.
[13] Kim C. E., Yoon J. S., Hwang H. J., “Synthesis of nanoporous silica aerogel by ambient pressure drying” J Sol-Gel Sci Technol, 49,47–52,2009.
[14] Kocon L., Despetis F., Phalippou J., “Ultralow density silica aerogels by alcohol supercritical drying”, J Non-Cryst Solids, 225, 1998, 96–100.
[15] Zhang H., Hong C., Qiao Y., “Synthesis, Structural and Thermal Properties of Nano-porous SiO2-based Aerogels, Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications”, ISBN: 978-953-307-165-7, InTech, 2011.
[16] Chao X., Jun S., Bin Z., “Ultralow density silica aerogels prepared with PEDS”, J Non-Cryst Solids 355 (2009) 492–495.

Sigma Mühendislik ve Fen Bilimleri Dergisi-Cover

ISSN: 1304-7191
Yayın Aralığı: Yılda 4 Sayı
Yayıncı: Yıldız Teknik Üniversitesi

Arşiv