STUDY ON ADSORPTION CAPACITY OF Mn(II) ON CARBON DERIVED FROM LOTUS

Abstract

This paper focus on the adsorption of Mn(II) in aqueous solution on carbon derived from lotus tree. The experiments were conducted using the following parameters: absorbent mass is 0.05g; the solution volume is 50 mL; pH = 5; shaking speed is 250 rounds/minute; equilibrium time is 60 minute at room teperature (25±1⁰C); optimal volume of adsorbent was 0.5 g (V_Mn(II)= 50mL; C_{o, Mn(II)} ~ 50 mg/L). In the temperature range of 303 - 323K, the values of ΔG^o < 0; ΔH^o = -16.64 kJ/mol implicates that the process is self-inflicted and exothermic. Maximum adsorption capacity is calculated by the Langmuir adsorption isotherm model. Maximum adsorption capacity was found as 68.97 mg/g at 25⁰C. Moving capacity corresponds to the flow rate of 1.5; 2.0 and 2.5 mL/min of 47.22; 39.95 and 35.20 mg/g, respectively. Use EDTA of solution was used to recover Mn(II) with high effective elution.