Coating of L-Arginine Modified Silica on Magnetite through Two Different  Sol-Gel Routes

Amaria Amaria; Suyanta Suyanta; Nuryono Nuryono

doi:10.22146/ijc.22521

Coating of L-Arginine Modified Silica on Magnetite through Two Different Sol-Gel Routes

https://doi.org/10.22146/ijc.22521

Amaria Amaria⁽¹⁾, Suyanta Suyanta⁽²⁾, Nuryono Nuryono^(3*)

(1) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Surabaya, Jl. Ketintang, Surabaya 60231
(2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281
(3) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281
(*) Corresponding Author

Abstract

In this research, magnetite coated with L-arginine modified silica (Fe₃O₄/SiO₂-GPTMS-Arg) has been synthesized through a sol-gel process at a room temperature in two Routes. In Route 1, a precursor of sodium silicate solution (source of SiO₂), 3-glycidoxypropyltrimethoxysilane (GPTMS) as a coupling agent and L-arginine (Arg) as the source of functional groups were added sequentially to magnetite nanoparticles (Fe₃O₄). Gelling was carried out by adding HCl solution dropwise to the mixture to reach pH of 7.0. The product was washed with water and ethanol and then dried at 65 °C for 1 day. In Route 2, sodium silicate solution was added to a mixture of GPTMS and L-arginine, and then the sol obtained was added into magnetite nanoparticles. The results were characterized with FTIR spectroscopy, X-ray diffraction, atomic absorption spectroscopy and volumetric method to identify functional groups, crystal size, iron ions released and amino groups content, respectively. The results showed that Fe₃O₄/SiO₂-GPTMS-Arg has been successfully synthesized through both two routes. Route 1, however, gave product of Fe₃O₄/SiO₂-GPTMS-Arg more stable and more content of amino groups than Route 2. The presence of amino groups leads to the application of the product for metal ion removal from aqueous solution.

Keywords

L-arginine; magnetite; silica; sol-gel; coating

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DOI: https://doi.org/10.22146/ijc.22521