Manganese Adsorptionfrom Groundwater by Eucalyptus Biochar

Manganese is frequently detected in groundwater, and adsorption is a popular method for manganese removal. This research aimed to use eucalyptus biochar for manganese adsorption from groundwater and to study the manganese fractionation in the biochar. One gram of eucalyptus biochar was loaded with groundwater containing manganese at the concentration of 1.098 mg/L. Concentrations of the remaining manganese were then measured at different times until reaching the equilibrium time. The pseudo first order and pseudo second order kinetics were applied to examine the adsorption kinetics. Loaded biochars were determined for manganese fractionation by sequential extraction and compared to virgin biochar. The results showed that the biochar had manganese adsorption capacity of 0.0146 mg/g at the equilibrium time of 48 hours. The adsorption kinetic was followed pseudo second order. The result from the sequential extraction indicated that the highest manganese fraction was bound to iron and manganese oxideat 23.89%,followed by to organic matterat 23.88%.