Preparation and Characterization of Diethylentriamine-montmorillonite and its application for the removal of Eosin Y dye:Optimization, Kinetic and Isotherm studies

Abstract

The adsorption capacity regarding anionic dye is low on Montmorillonite which is a common nanoclay mineral with a permanent negative structural charge. A novel montmorillonite-based composite was applied for the removal of anionic dye from aqueous solution. A facile one-step method was employed to produce diethylentriamine-montmorillonite (DETA-MMT) composit. The structural and morphological study of the synthesized composite was then carried out by fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Adsorption characteristics of DETA-MMT were examined by using eosin Y (EY) dye as an anionic dye. The effects of several parameters such as pH value of the dye solution, adsorbent dose,

adsorption time and the initial dye concentration on the EY adsorption onto the composite were investigated. DETA-MMT had a high uptake capacity in room temperature and could remove Eosin dye of about 90 % with 8 g/L of adsorbent in only 5 min. Langmuir and Freundlich isotherms were employed for the study of the adsorption of EY dye onto DETA-MMT which revealed that adsorption kinetics of EY dye onto the composite followed the pseudo-second-order kinetic model. The method was applied to the removal of EY dye in tap water and river water samples from different parts of Khouzestan, Iran.