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۱Removal of Hexavalent Chromium from Aqueous Solution by Powdered Scoria–Equilibrium Isotherms and Kinetic Studies
اطلاعات انتشار: World Applied Sciences Journal، سي و سوم،شماره۳، ۲۰۱۵، سال
تعداد صفحات: ۸
Heavy metals, particularly chromium are recognized as threatening pollutants leaving serious adverse effects on human health and environment due to their toxicity, un–biodegradable properties and high concentration in industrial effluent. The present study aimed to evaluate the Scoria powder efficiency, as an adsorbent, in removing chromium from aqueous solution. After preparing Scoria powder, batch experiments are performed in different times and adsorbent dosages (pH=7, heavy metals concentration = 50 mg\L and stirring\minute=200 rpm). Adsorption isotherm and kinetic reactionincluding Langmuir, Freundlich, Pseudofirst order and second–order model, Intra–particle diffusion and Elovich kinetics were applied to correlate the adsorption. The results indicated that chromium has low absorbs and its adsorption obeying Freundlich model. The correlation coefficients obtained from Freundlich model and Pseudo–second order kinetic were R2=0.996 and R2=0.999, respectively. So Freundlich expression and the kinetics of pseudo–second order gave a better fit to the experimental data of Scoria powder. Also, removing efficiency revealed significant increase after increasing the adsorbent dose and contact time (R20.001). According to obtained dimensionless constant separation term (RL) of Langmuir expression, the RL values for the adsorption of chromium onto Scoria powder range 1–0, indicating that the adsorption is a favorable process.
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