Adsorptive removal of methylene blue using the natural adsorbent- Vitex negundo Stem

The mechanism of Methylene Blue adsorption on acid activated carbon Vitex Negundo Stem (AAVNS) has been studied through batch experiments. Generally, dyes are organic compounds used as coloring products in chemical, textile, paper, printing, leather, plastics and various food industries. The need for the treatment of dye contaminated waste water passed out from the industry. In this study, Vitex Negundo Stem was studied for its potential use as an adsorbent for removal of a cationic dye methylene blue. The effects of various experimental parameters, such as initial dye concentration, contact time, adsorbent dose and effect of temperature were evaluated. The results showed that the dye removal increased with increase in the initial concentration of the dye.The experimental data were fitted into the pseudosecond order kinetic model. The equilibrium of adsorption was modeled by using the Langmuir and Freundlich isotherm. The results show that AAVNS could be employed effective and low cost material for removal of dyes and colour from aqueous solution.