(6ji) Biosorption of Methylene Blue Using Citric Acid Modified Arjun Bark Powder

Teaching Interests: Reaction Engineering, Industrial Pollution Control Engg, Heat Transfer, Chemical Technology

ABSTRACT: In this article the adsorptive removal of methylene blue (MB) from its aqueous solution using citric acid modified arjun bark powder as an adsorbent is reported. Initially, the adsorbent was characterized by various analytical techniques (SEM, BET, FTIR and pH_pzc). After characterizing the adsorbent, it was used for carrying out batch investigation on the biosorption of MB. The batch experiments revealed a very high percentage removal of MB of about 100%. The batch experiment results show Temkin isotherm. The maximum monolayer adsorption capacity observed was 512.82 mg/g at natural pH of 7.5. On the other hand, results followed the pseudo-second order kinetic model better. The energy of activation in the present study was 10 KJ/mol. The adsorptive mass transfer coefficient obtained was 1.65×10^-7 m/s. The value of diffusivity obtained was 2.27×10^-11. The experimental data were used to obtain the batch reactor design.