Abstract

EFFECT OF CO-EXISTING IONS ON DEFLUORIDATION CAPACITY OF JAVA PLUM SEEDS

Tej Pratap Singh, Apoorva Tripathi, Deepankar Dev Pandey, C. B. Majumder*

ABSTRACT

Objective: This investigation has been carried out to study the effects of co-existing ions on the adsorption capacity of java Plum Seeds. Methods: Batch experiments were conducted to investigate the effects of the type and concentrations of co-existing anions on defluoridation in adsorbtion process. In the solutions with co-existing anions, most of the defluoridation took place in bulk solution. The residual fluoride concentrations are a function of the types of the functions in the solutions with and without co-existing anions are different. Results: The results demonstrate that the type of the dominating anion directs the adsorbtion defluoridation reaction. The defluoridation efficiency was between 90-98% and most of the fluoride removal reaction occurred on the surface of the anion profuse area of adsorbent in the solution without the co existing anions, due to the adsorbtion effect. Conclusion: The presence of chloride, bicarbonate, sulphate and phosphate ions prevented the inhibition of fluoride ions, while the bicarbonate and phosphate ions were more efficient. Results concerning the effects of anions on the adsorption capacity of the Java Plum Seeds showed that the Cl- and SO42- have very little effect on the fluoride removal efficiency but HCO3- and PO43- had a profound effect on the removal capacity of the adsorbent.

Keywords: Java Plum Seeds, Biosorption, Co-existing ions, defluoridation.