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Type: Journal article
Title: Chemical functionalization of diatom silica microparticles for adsorption of gold (III) ions
Author: Yu, Y.
Addai-Mensah, J.
Losic, D.
Citation: Journal of Nanoscience and Nanotechnology, 2011; 11(12):10349-10356
Publisher: American Scientific Publishers
Issue Date: 2011
ISSN: 1533-4880
Statement of
Yang Yu, Jonas Addai-Mensah, Dusan Losic
Abstract: Diatom silica microparticles from natural diatomaceous earth (DE) silica have been functionalized with 3-mercaptopropyltrimethoxysilane (MPTMS) and their application for adsorption of gold (III) ions from aqueous solutions is demonstrated. Fourier transform infrared spectroscopy (FTIR) and X-ray Photoelectron spectroscopy (XPS) analyses of the MPTMS modified diatom microparticles revealed that the silane layer with functional group (-SH) was successfully introduced to the diatom surface. The adsorption study of Au(III) ions using MPTMS-DE indicated that the process depends on initial gold (III) concentration and pH showing maximum adsorption capacity at pH = 3. The Au(III) adsorption kinetics results showed that the adsorption was very fast and followed a pseudo-second-order reaction model. The Langmuir model was used to provide a sound mechanistic basis for the theoretical of the adsorption equilibrium data. Gold recovery from MPTMS-DE structures was also investigated by using acidified thiourea solution and found to be high (> 95%). These results show that chemically modified DE microparticles can be used as a new, cost effective and environmentally benign adsorbent suitable for adsorption of gold metal ions from aqueous solutions.
Keywords: 3-Mercaptopropyltrimethoxysilane; Diatomaceous Earth; Diatoms; Gold Adsorption
Rights: ©2011 American Scientific Publisher
DOI: 10.1166/jnn.2011.5017
Appears in Collections:Aurora harvest 2
Chemical Engineering publications

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