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https://hdl.handle.net/2440/88283
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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 1533-4899 |
Statement of Responsibility: | 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 |
Published version: | http://dx.doi.org/10.1166/jnn.2011.5017 |
Appears in Collections: | Aurora harvest 2 Chemical Engineering publications |
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