SONGKLANAKARIN JOURNAL OF SCIENCE & TECHNOLOGY

Volume 43, No. 01, Month JANUARY, Year 2021, Pages 222 - 228

Modified montmorillonite with alkylamine chloroanthraquinone as a colorimetric sensor for detection and separation of cu2+ from an aqueous solution

Duangrat Thongkum, Thitiporn Nomnuch, Saksit Chuenchomnakjad

Abstract Download PDF

To compare the adsorption capacity of Cu2+ between Mt and Mt modified with alkylamine chloroanthraquinone for a colorimetric sensor (Mt-L), the adsorption by Mt and Mt-L of Cu2+ was studied by using UV-vis spectroscopy. Their structures were characterized by FTIR spectroscopy and XRD techniques. Effects on the removal efficiency of Cu2+ by adsorbent quantity, pH, initial Cu2+ concentration, equilibrium adsorption time, adsorption kinetics, and adsorption isotherm were determined. The results revealed that the maximum adsorption efficiency was 54% with an initial Cu2+ concentration of 3.5010-3 M, 40.0 g/L of Mt-L and an initial pH of 5.0. The adsorption kinetics were compatible with the pseudo-second order model and the adsorption isotherm with the Langmuir isotherm. The qm of Mt-L was calculated to be 9.5511 mg/g, which was higher than for the adsorption of Cu2+ by Mt (2.6260 mg/g). Therefore, Mt-L has great potential as an adsorbent of Cu2+ ions in aqueous solution.

Keywords

adsorption, chloroanthraquinone, colorimetric sensor, copper ion, montmorillonite

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