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Fixed bed adsorption studies of Rhodamine-B dye using polymer bound adsorbent

An eco-friendly adsorbent developed by coating polyaniline over an activated carbon prepared from the seeds of Prosopis Juliflora using ZnCl2 as an activating agent (PPAC). The polymer bound adsorbent has good adsorption characteristics with a surface area of 1028 m2/g. A continuous flow fixed bed study carried out by using PPAC as an adsorbent packed in a column for the removal of Rhodamine-B dye from aqueous solution. The effect of operating parameters such as flow rate, bed height and inlet dye concentration on the sorption characteristics of RB investigated at room temperature (30°C) and the natural pH of dye solution. On increasing the influent concentration from 25 to 75 mg/L, the volume of effluent treated decreases from 3800 mL to 2950 mL. The kinetic model suggested by Bohart-Adam, Thomas and Yoon-Nelson were employed to study this adsorption system. The YN model fits exceptionally well for the adsorption of RB onto PPAC with respect to all of the calculated parameters with high correlation coefficient (0.9431 to 0.9668) and low standard deviation(0.04 to 0.75).

Author(s): Gopal N. and Asaithambi M.

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