Abstract
Due to the large amount of wastewater discharged by the textile industry, many alternative researches have been undertaken in recent years to effectively remove textile dyes from water. In our study, the adsorption from aqueous solution of two important textile dyes, reactive azo dyes Remazol Red (RR) and Remazol Blue (RB) was studied with calcined chicken eggshell (Gallus Gallus domesticus) adsorbent. Batch biosorption studies were conducted to evaluate the effect of various parameters, such as contact time, initial dye concentration, amount of adsorbent, and pH, to determine the optimal adsorption parameters (Remazol Brilliant Red F3B: Ci=20 mg/l, 1.5g adsorbent, 160 μm, 700 rpm, pH=6.0�0.2, T=20�2 oC, where E%=97.3; Remazol Brilliant Blue R: Ci=20 mg/l, 1.5 g adsorbent, 160 μm, 700 rpm, pH=6.0�0.2, T=20�2oC, where E%=98.8). The changes in morphological structure were evaluated by SEM analysis. The experimental isotherm data were analyzed using the Langmuir, Freundlich, Dubinin-Radushkevich and Temkin isotherm models. Biosorption kinetics data were tested using pseudo-first-order, pseudo-second-order, where in our experimental conditions the biosorption followed a pseudo-second-order reaction. EDS analyses were carried out, and bioconcentration factors were calculated before and after adsorption. The results of this study indicate that adsorption with calcined eggshell is a promising, feasible, reliable and eco-friendly method for Remazol textile dye removal from aqueous solutions.
Highlights
Water is the source of life and energy, millions of people all around the world are experiencing the scarcity of clean and drinkable water [1]
In our previous study on Remazol Brilliant Violet-5R dye adsorption with calcined eggshell we investigated the thermogravymetric parameters of the eggshell, we found that there were two main mass losses when eggshell was exposed to heat, below 800 oC and in the range 800-900 oC (CaCO3 was transformed into CaO)
Eggshell in calcined form has proved to be an effective adsorbent for the purification of artificially contaminated aqueous solutions by removing both reactive textile dyes (Remazol Brilliant Red F3B, Remazol Brilliant Blue R)
Summary
Water is the source of life and energy, millions of people all around the world are experiencing the scarcity of clean and drinkable water [1]. Textile industries wastewaters have complex composition, their exposure to nature in large quantities involve complicated cleaning technologies, especially if the contaminants are at low concentrations, generally these treatments are associated with high costs, their practical application impossible. These facts justify researches for finding out alternative methods that are more effective, advantageous and low cost [2]. Remazol Brilliant Red (RR) and Remazol Brilliant Blue F3B (RB) are reactive dyes, frequently used as a starting material in the production of polymeric dyes They represent an important class of toxic and recalcitrant organopollutants. They consist of a chromophore and a functional group that binds the dyestuff to the
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