Abstract

Amaria^1,2, Nuryono¹ and Suyanta¹

DOI : http://dx.doi.org/10.13005/ojc/330146

L-arginine-modified silica-coated magnetite nanoparticles(Fe₃O₄/SiO₂-GPTMS-Arg) have been synthesized by sol-gel process for adsorption of Au(III) ion in aqueous solution. Modification of L-arginine on silica coated magnetite through a coupling agent of 3-glycidoxypropyl-trimethoxysilane (GPTMS) was performed in avariousmole ratioof GPTMS:Arg 1:0; 1:1; 1:2 and 1:3.The products of Fe₃O₄/SiO₂-GPTMS-Arg were characterized with XRD, FTIR, EDX, TGA, and Kjeldahl methods.The results showed that based on characterization data Fe₃O₄/SiO₂-GPTMS-Arg has been successfully synthesized with the optimum mole ratio of 1:2. The optimum adsorption of Au(III) occurs at pH 3 and contact time of 60 min. The adsorption capacity followed Langmuir isotherm model was found0.638 mmol.g^-1 for the Fe₃O₄/SiO₂-GPTMS-Arg 1:2.Fe₃O₄/SiO₂-GPTMS-Arg nanoparticles show a potential adsorbent for an effective Au(III) ion removal.

L-arginine; silica; magnetite; Au(III) ion adsorption

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