Duangrat Thongkum, Thitiporn Nomnuch and Saksit Chuenchomnakjad

DOI: 10.14456/sjst-psu.2021.29

pp. 222 - 228

Abstract

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 3.50x10^-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