Adsorption of fluoride from aqueous solution on La3+-impregnated cross-linked gelatin

Fluoride pollution of water is widespread in many parts of the world. A novel adsorbent, La3+-impregnated cross-linked gelatin, was prepared for the removal of fluoride from drinking water or agroindustrial wastewater by impregnation of cross-linked gelatin with La3+. The optimum pH for La3+ impregnation of cross-linked gelatin was determined. The adsorption characteristics of La3+-impregnated cross-linked gelatin for fluoride were analyzed under various conditions. Studies were conducted to get optimum operating system parameters such as contact time, pH, and adsorbent dose. Regeneration studies were also carried out to select right regenerant and the reuse property of this adsorbent was determined. Experimental results showed that this adsorbent exhibited maximum adsorption capacity of 98.8% at pH of 5-7, contact time for 40 min, and dose of 0.2 g when used to treat 50 ml of F(-)containing aqueous solution. (C) 2003 Published by Elsevier B.V.