Research of chromium (VI) ion adsorption by montmorillonite modified by cationic surfactants

Authors

DOI:

https://doi.org/10.15587/2312-8372.2016.81015

Keywords:

organoclay, montmorillonite, hexadecyltrimethylammonium bromide, adsorption, chromium

Abstract

Montmorillonite has high cation exchange capacity and can be used as a sorbent for the removal of metal cations. But anions adsorption on the surface of the mineral is limited.

Targeted regulation of hydrophobic and hydrophilic surface properties using sorbents provides an opportunity to increase its absorption properties in relation to anions.

The results show that the degree of Cr(VI) extraction by the sorbents obtained at montmorillonite modification increases with increase of CEC/S. Organoclays that modified at CEC/s  1 showed higher adsorption capacity in relation to Cr(VI), but a part of HDTMA isn’t related to the mineral surface and involved in the removal of Cr(VI) from solution with precipitation in the form of alkyl ammonium chromate. HDTMA in free form is harmful to the environment, so CEC/S for these sorbents must not exceed 1.

Adsorption of Cr(VI) compounds essentially depends on pH of a solution. The highest values are obtained at pH from 1 to 6. Adsorption properties of organoclays are decreased at pH 6 to 8. Removal of Cr(VI) is not significant in the alkaline environment.

These studies will form the basis for the study of structural and mechanical properties of organoclays to use their suspensions for removal of anions of heavy metals and radionuclides using the latest environmental technologies directly from the soil layers.

Author Biography

Nataliya Zhdanyuk, National Technical University of Ukraine «Igor Sikorsky Kyiv Polytechnic Institute», Peremogy ave., 37, Kyiv, Ukraine, 03056

Assistant

Department of chemical technology of ceramics and glass

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Published

2016-09-29

How to Cite

Zhdanyuk, N. (2016). Research of chromium (VI) ion adsorption by montmorillonite modified by cationic surfactants. Technology Audit and Production Reserves, 5(3(31), 11–15. https://doi.org/10.15587/2312-8372.2016.81015

Issue

Vol. 5 No. 3(31) (2016): Technologies of food, light and chemical industry

Section

Technologies of food, light and chemical industry

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Copyright (c) 2016 Nataliya Zhdanyuk

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