Removal of Ferrous Ions from City Water by Activated Carbon Prepared from Palm fronds
This study shows that the activated carbon produced from palm fronds rather than produced by ZnCl2, after treatment by phosphoric acid (H3PO4) has more ability to remove total organic carbon from azo-dyes, which also has a good efficiency as low cost adsorbent for removal of ferrous ions from city water. Different variables such as pH, residence time, adsorbent dose, initial concentration and temperature are studied, which indicate that the removal of the heavy metal ions depend in these variables. The results shows that the removal of Fe+2 increases from 91.84% to 97.9% with increasing pH from 2 to 6, and in case of pH above 6, the % removal and adsorption capacity decrease with increasing pH. The maximum adsorption of ferrous ions is found at pH 6. Kinetic studies specify that pseudo-second-order reaction model defines the adsorption process where the values of correlation coefficient (R2), for the pseudo-second order adsorption model is relatively high (>0.9979), and the adsorption capacities determined agree with the experiments. Still, R2 values for the pseudo-first order are not satisfactory. Hence it is deduced that the pseudo-second order adsorption model suits more to describe the adsorption kinetics of ferrous ions by the activated carbon prepared from the treatment of palm fronds with H3PO4. The study shows that ΔG° is a negative value that states the feasibility and spontaneity of adsorption process.
Heavy metals, Activated carbon, Palm fronds, H3PO4, ZnCl2, Adsorption.