EVALUATION OF NH4+ADSORPTION CAPACITY FROM WATER BY RICE STRAW DERIVED BIOCHAR
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Abstract
Ammonium (NH4+) is a pollutant that can be harmful to the water environment. The purpose of this study is to access NH4+ removal capacity from water by biochar. In this paper, recovery efficiency, some surface chemical properties of biochar which were prepared at different temperatures (300, 450 and 600 ºC) from rice straw were determined including TOC, pH, pHpzc, functional groups of H+/OH- and CEC. The trend of NH4+ adsorption equilibrium and kinetics of biochar have been studied. Experimental design of adsorption equilibrium were carried out by exposing biochar to NH4+ solution at different concentrations, range from 0 to 25 mg NH4+/L for about 12 hours. Kinetic survey were carried out when biochar was exposed to a solution containing 8.3 mg NH4+/L for a varying length of time. Experimental data of NH4+ adsorption process is suitable for Langmuir, Freundlich models and the second-order pseudo kinetic model to explain the NH4+ adsorption kinetics to the biochar forms which derived from rice straw.