Abstract
Fluoride removal is an important rationale for the human beings and animals. According to the WHO limit the fluoride should not be greater than 1.5 mg/L because it cause dental and bone deficiency to living entities. This problem arises day by day due to lack of defluoridation technique and expensive nanoparticles. Moreover the cost effective and easy to use technology is not currently available. Similarly, many researchers have also used adsorbent which is expensive and less effective for fluoride removal. In present paper, silica nano adsorbent modified from rice husk was used for fluoride removal which is inexpensive and gives a good result in fluoride removal. Characterization of adosrbent was done by Fourier-transform infrared spectroscopy, X-ray powder diffraction, Scanning electron microscope and Brunauer-Emmett-Teller. Different parameters affecting for defluoridation, kinetic study, isotherm study and regeneration study was systematically investigated. The result demonstrated a splendid efficiency in fluoride removal with adsorption capacity of 12 mg/g. Rice husk can be used as an alternative low cost adsorbent for fluoride removal.
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