Preparation of glycine–modified silica nanoparticles for the adsorption of malachite green dye

Rachel Fran Mansa, and Coswald S. Sipaut, and Ismail A. Rahman, and Nur Sabrina M. Yusof, and Mohammad Jafarzadeh, (2016) Preparation of glycine–modified silica nanoparticles for the adsorption of malachite green dye. Journal of Porous Materials, 23 (1). pp. 35-46. ISSN 1380-2224


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Organo-functionalized silica nanoparticles were prepared using an in situ modified sol–gel process (hydrolysis–esterification–condensation). This was accomplished under basic conditions by the addition of glycine as a modifier. Evidence of glycine presence was supported by Fourier Transform Infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). The addition of 10 wt% glycine into the silica precursor(tetraethoxysilane), in ethanol or methanol media, resulted in a small particle size with a narrow particle size distribution and a high surface area. This is known as a mesoporous structure with a high adsorption volume. Adsorption behavior of the glycine-modified silica nanoparticles was then investigated using a malachite green (MG) dye. Adsorption capacity was raised by increasing the amount of glycine modified silica, MG concentration, and contact time. The Langmuir adsorption isotherm gave the best fit to the experimental data, suggesting monolayer adsorption on a homogenous surface. Adsorption kinetics were predicted by the pseudo-first order kinetic model rather than the pseudo-second order kinetic model, in which the values of adsorption capacity between the theoretical and experimental were more consistent. © 2015, Springer Science+Business Media New York.

Item Type: Article
Uncontrolled Keywords: Amino acids; Carbonate minerals; Dyes; Fourier transform infrared spectroscopy; Kinetic parameters; Kinetic theory; Kinetics; Nanoparticles; Particle size; Particle size analysis; Silica; Sols; Thermogravimetric analysis; Adsorption capacities; Fourier transform infra red (FTIR) spectroscopy; Langmuir adsorption isotherms; Malachite green; Mesoporous structures; Modified silica; Pseudo-first order kinetic model; Pseudo-second-order kinetic models; Adsorption
Subjects: T Technology > TP Chemical technology
Divisions: FACULTY > Faculty of Science and Natural Resources
Depositing User: ADMIN ADMIN
Date Deposited: 03 Mar 2016 04:34
Last Modified: 16 Oct 2017 07:37

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