Utilization of biomass (Eucalyptus Lanceolata) as an adsorbent - removal of methylene blue from wastewater

Investigation relevant to the influence of activated carbon (AC) supports biomass of Eucalyptus Lanceolata as an adsorbent was not reported previously. The recent work synthesized a series of studies to know various experimental parameters equilibration time and temperature of the adsorbent for the elimination of dye. Physical structure characterization measured that the surface area of activated carbon increased from 399 to 475 m².g^-1 revealed that the raw biomass had more compact surface than those of activated carbon. Ftir bands were found in the region between 3406.29 cm^-1 and 3414.0 cm^-1 indicates (-OH) stretching group which leads to hydrogen bonding. Adsorption of Methylene blue was studied on raw and activated carbon. The average activation energy of the activated carbon was 33.67 kJ.mol^-1, slightly lower than those of raw carbon, which was 49.14 kJ.mol^-1. Intra particle diffusion, Elovich and Bhangam models were applied to evaluate kinetics studies at 20, 30 and 40 °C. Thermodynamic parameters, ΔH^≠,ΔS^≠ and ΔE^≠ were calculated from the adsorption of kinetics. Results indicate that adsorption is a spontaneous process. The negative value of entropy determined that the acid molecules take an oriented position on the surface of the adsorbent. The results show that all the models were best fitted for adsorption. (author)