Abstract
Natural clay from Nabeul region (north of Tunisia) was investigated for the removal of two anionic textile dyes (RR120 and BB150) from aqueous solution. The raw clay was characterized by means of XRD, IR spectroscopic, chemical analysis, cation exchange capacity and BET surface area analysis.Adsorption studies were carried out under various parameters such as pH, contact time, initial dye concentration and temperature. The adsorption kinetic data was tested by pseudo-first order, pseudo second-order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using Langmuir, Freundlich, Temkin and Dubinin–Radushkevich isotherm models. The thermodynamic parameters (DH°, DS° and DG°) of the adsorption were also evaluated. The adsorption process was found spontaneous and endothermic in nature. The kinetics of adsorption were best described by pseudo-second order kinetic model. The Langmuir adsorption model totally agrees with the experimental data.
Highlights
Water contamination by pollutants from various sources is a current problem
From lnKc vs. 1/T curves (Fig.9), thermodynamic parameters including the change in free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) were calculated and used to describe thermodynamic behavior of the adsorption of Reactive Red 120 (RR120) and Blue Bezaktiv S-GLD 150 (BB150) onto the raw clay
This work concerns the study of the potentiality of natural clay, collected near a textile industry, to remove two used texti le dyes RR120 and BB150
Summary
Water contamination by pollutants from various sources is a current problem. In the textile industry, wastewater is one of the largest sources of surface water and groundwater pollution. Because of the high stability and the low biodegradability of textile dyes they cause serious environmental problems. The treatment of water contaminated by textile dyes was the subject of several studies to reduce the color intensity and the amount of organic matter. The present work concerns the study of the potentiality of Tunisian natural clay as a low cost adsorbent for the removal of two organic textile dyes from aqueous solution as an ideal alternative to the current expensive methods of removing dyes from wastewater. The adsorption kinetic data was tested by pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models.
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