Study of removal Malachite Green dye from aqueous solution using snail shell powder as low-cost adsorbent

Abstract

This research using snail shell (Rostellaria) powder to remove (Malachite Green ) dye from aqueous solution via adsorption. Experiments were conducted at 298 K to know the impact of initial concentration of Malachite Green, contact time, pH and effect of ionic strength. The optimum conditions for the adsorption of Malachite Green were realized at 0.0200 g of the adsorbent material . The maximum removal ratio was equal to 86.6585 % at 7.0000 mg/L,10 min as adsorption time and 298 K . Equilibrium adsorption isotherms was investigated. The empirical data were analyzed by the Langmuir, Freundlich and Temkin models of adsorption at different temperature change from (298 to 338) K. The adsorption isotherm data were suitability well to Langmuir isotherm. The calculated thermodynamics information of the adsorption process ΔG°, ΔH° and ΔS° refers that removal process occur via an adsorption process which features with spontaneous, exothermal and raise in the randomness of the molecules of the adsorbent dye,the obtained isotherms information from the experiments were conform For the type (S-curve) at Giles discretion.