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Journal of Chemistry
Volume 2017, Article ID 9560293, 10 pages
Research Article

3-Mercaptopropyltrimethoxysilane Modified Diatomite: Preparation and Application for Voltammetric Determination of Lead (II) and Cadmium (II)

1College of Science, Hue University, Hue City 530000, Vietnam
2Faculty of Technology, Industrial University of Ho Chi Minh City, Quang Ngai Campus, Quang Ngai City 570000, Vietnam
3Faculty of Natural Science, Thu Dau Mot University, Thu Dau Mot City 590000, Vietnam
4Department of Agriculture and Rural Development, Tam Ky City, Quang Nam Province 560000, Vietnam

Correspondence should be addressed to Dinh Quang Khieu; nv.ude.inueuh@ueihkqd

Received 11 September 2016; Revised 15 January 2017; Accepted 15 February 2017; Published 14 March 2017

Academic Editor: Pedro Ávila-Pérez

Copyright © 2017 Dinh Quang Khieu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this study, functionalized diatomite was prepared by grafting of 3-mercaptopropyltrimethoxysilane (MPTMS) to diatomite (MPTMS-diatomite). The diatomite with thermal treatment from 100 to 700°C was functionalized by MPTMS under dry and humid conditions. The obtained MPTMS-diatomite was characterized by X-ray diffraction (XRD), thermal gravity-differential scanning calorimeter (TG-DSC), and Fourier transformation infrared (FT-IR). The results showed that an increase in treatment temperature seems to reduce the loading of MPTMS onto diatomite. The humidity of diatomite was favorable for the grafting of functional groups on the surface. The possible mechanisms of MPTMS loading to diatomite (MPTMS-diatomite) were also proposed. The performance of a carbon paste electrode (CPE) modified with MPTMS-diatomite in the simultaneous determination of Cd(II) and Pb(II) ions was addressed.