Adsorption of As(V)from aqueous solution by chemically doped coir pith carbon

摘要

The present work examines the possible use of coir pith,a by-product from coir fibre industry as a means of removing As(V)from aqueous solution.Kinetic and equilibrium experiments were performed in order to evaluate the efficiency of the thermally activated coir pith carbon(TCPC).The efficiency of TCPC was improved by doping with FeSO4.7H2O(FCPC)and CuSO4.5H2O(CCPC).Adsorption studies were carried out using these doped and undoped coir pith carbon.Maximum removal was observed with FCPC with a Q_0 value of 18.9 mg/g followed by CCPC with Q_0 value of 14.77 mg/g at maximum As(V)concentration.TCPC was comparatively less efficient when compared to the doped adsorbents and had a Q_0 value of 8.39 mg/g.The rate of adsorption was dependent on the As(V)concentration.Langmuir and Freundlich isotherms were applied and the experimental data fitted well with these isotherms.The desorption and regeneration studies revealed that FCPC after regeneration could remove 62.8% As(V)when recycled.The results indicate that FCPC could be used as an effective adsorbent for As(V)removal from ground water sample.