ADSORPTION BEHAVIOR OF EGGSHELL MODIFIED POLYALTHIA LONGIFOLIA LEAF BASED ALUMINA AS A NOVEL ADSORBENTS FOR FLUORIDE REMOVAL FROM DRINKING WATER

Civil Engineering

The present study reveals about the fluoride removal from drinking water by means of absorption through the Egg shell modified Polyalthia longifolia leaf based alumina (PBA+ES) technique. Various method were employed to characterize the adsorption mechanism such as X-ray diffraction (XRD), Scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR).The fluoride removal capacity of PBA+ES adsorbents were investigated in batch studies, column and domestic defluoridation performance for drinking water. The Results of the experiment concluded that the batch adsorption studies show high efficiency for removal of fluoride. The pseudo-first-order, pseudo-second-order and intra particle diffusion kinetic models were applied to verify the experimental data. The pseudo-second-order equation and the equilibrium data was attained by Langmuir equation. The maximum adsorption capacity of PBA+ES was 20.62 mg/g. The five sorption-desorption cycles exhibited for regeneration where the results of the thermodynamic study reveals about the nature of the adsorption process to be spontaneous and endothermic. For on-field and domestic application, the adsorbent performance was studied in a fixed bed column and household water filter. It is also noticed that PBA+ES is efficient, easy, captive method used for the fluoride removal from the contaminated water. The present study suggest about the simple, effective, suitable method for fluoride removal from contaminated water.

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