Removal of Cr(VI) and Cu(II) ions from aqueous solution by rice husk ash—column studies
Abstract: In this present study, the technical feasibility of rice husk ash for adsorptive removal of Cr(VI) and Cu(II) is examined in packed bed from aqueous solutions. The effects of different operating parameters such as height of the packed bed column (5–15 cm), flow rate of aqueous metal ion solution (10–30 ml min−1), and initial metal ion concentration (10–30 mg L−1) were studied. Capacity of the bed to absorb metal ions was found to increase with an increase in bed height, decrease in flow rate, and metal ion concentration. Adams–Bohart, Yoon–Nelson, and Thomas models were applied to the experimental data for the prediction of breakthrough point and also to determine the model parameters to characterize the column. The Yoon–Nelson model and Thomas model were applicable for Cr(VI) removal, and for Cu(II), Thomas model was suited.
Cites background from "Removal of Cr(VI) and Cu(II) ions f..."
...Higher incoming flow rate gives the lower removal efficiency (Han et al. 2009b; Chen et al. 2012; Sarkar and Das 2015) Effect of influent concentration of Cr(VI) The effects of influent concentration of Cr(VI) on the breakthrough curves for peanut and almond shell are shown in Fig....
...…transfer coefficient or diffusion coefficient and hence the breakthrough curves became sharper which indicates that the adsorption process controlled by the smaller mass transfer zone and also intra-particle diffusion (Uddin et al. 2009, Baral et al. 2009; Chen et al. 2011, Sarkar and Das 2015)....
...The intake of Cr(VI) increased with the increase of bed depth due to an increase in contact time for Cr(VI) adsorption as well as adsorbent surface area increased (Suksabye et al. 2008; Sarkar and Das 2015)....
...Higher incoming flow rate gives the lower removal efficiency (Han et al. 2009b; Chen et al. 2012; Sarkar and Das 2015) Effect of influent concentration of Cr(VI)...
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