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Title: Removal of Fluoride Ions From Water Using Rice Husk Based Activated Carbon
???metadata.dc.contributor.*???: Teshome Werku (Mr.)
Solomon, Sabiro
Keywords: Fluoride Ions;Rice Husk;Activated Carbon
Issue Date: 4-Jan-2016
Publisher: AAU
Abstract: This study investigated the potential use of rice husk based activated carbon for removal of fluoride from aqueous solution and real sample in batch mode experiments. Activated carbon was prepared first through physical activation and then soaked with sodium hydroxide (NaOH) as activating agent. And finally, samples were heated to the final activation temperature (8000C and 8500C). Using produced activated carbon the effects of contact time, adsorbent dosage, pH, and impregnation on the efficiency of fluoride removal were investigated. It was found that fluoride adsorption was pH dependent with maximum removal efficiency at 2.0 in all initial concentrations. Maximum adsorption of F- on activated carbon (Impregnation Ratio-1:1, dosage-13g/l, C0= 20.8 mg/l and contact time-180 min) was found to be 85.24%. But it decreased gradually with the increase in pH. Equilibrium adsorption isotherms and kinetics were also investigated. The kinetic data obtained at different concentrations (60ppm, 40ppm and 20ppm) were analyzed using a pseudo-first-order and pseudo-second-order equation. It was better described with the pseudo-second-order model compared to the pseudo first-order model. In the case of adsorption isotherms, the adsorption process obeyed Langmuir adsorption model. Generally, from the study it was observed that rice husk based activated carbon had good adsorptive efficiency, and hence it is concluded that rice husk can be used as raw material to produce activated carbon.
Appears in Collections:Enviromental Engineering

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