Available online at www.derpharmachemica.com Scholars Research Library Der Pharma Chemica, 2011, 3(3): 73-83 (http://derpharmachemica.com/archive.html) ISSN 0975-413X CODEN (USA): PCHHAX 73 www.scholarsresearchlibrary.com Studies on sorption of fluoride by prepared activated Kaza’s carbons V.Sreenivasa Rao 2 , Ch. Chakrapani 2 , Ch Suresh Babu 2 , Kaza Somasekhara Rao 1* , M. Nageswara Rao 3 , Dipak Sinha 1 1 Dept. of Chemistry, Nagaland Universty Lumani, Nagaland, India 2 Dept. of Chemistry, Acharaya Nagarjuna University- Nuzvid Campus, Nuzvid, India 3 Dept. of Chemistry, Sri Chaitanya Mahila Kalasala,Vijayawada. A.P ______________________________________________________________________________ ABSTRACT Investigations are made on the removal of fluoride from water by prepared activated carbons. Three activated carbon adsorbents, BKC, BOC and RSC are prepared from selected bio- materials of bergera koenigh, batavia orange and raphanus sativus respectively. The adsorption capacity towards adsorption of fluoride from aqueous solution was studied and was determined by using fixed amount of adsorbent(0.1g/100mL) and a known concentration of adsorbate (5mg/L) solution at 30 minutes agitating time. The data have been analyzed in the light of adsorption isotherms, adsorption kinetic equations and intraparticle diffusion model. Regeneration of adsorbents was studied. Key words : sorption, activated carbons, fluoride removal. ______________________________________________________________________________ INTRODUCTION Research scientists have screened numerous substances for defluoridation efficacy and several methods have been evolved for the removal of fluoride from drinking water. Activated carbons find wide application as adsorbents catalysts or catalysis supports. Adsorption by activated carbons also provide to be the most successful and feasible technique for the removal of heavy metals and fluoride from water and industrial effluents [1,2,3]. The activated carbon adsorption has been shown to be effective and widely employed for waste water treatment technique[4]. The recent investigation reported the modification of carbon surfaces using oxidizing agents [2,4,5]. The treatment introduces three types of surface oxygen complexes as acidic, basic and neutral [6,7]. Oxygen is the dominant heteroatom in the carbon matrix and the presence of functional groups such as carbonyl, carboxyl, phenols, enols, lactones and quninones has been postulated[8]. Literature survey reveals many non-conventional biosorbents [9-12]. So we have