Removal of selenium from waste water by sweet lime peel

Abstract

The present study explained the adsorption potential of sweet lime peel to remove selenium from aqueous solution. The presence of -OH, -N-H, C=0,-C-0 groups play major role in adsorption of selenium ions onto adsorbent. The surface morphology pretends to be porous in nature. The optimum equilibrium time and pH was 120 min and 4.0.The adsorption isotherm fitted best was D-R. The monolayer adsorption capacity of sweet lime peel was 1.213. The adsorption data was best fitted by pseudo- second order kinetics with regression coefficient of 0.997 and liquid film diffusion model was rate controlling step. The positive value of ∆H and ∆S suggest that the process was endothermic and randomness at solid - solution interface.