Adsorption Studies of Methylene Blue Dye on Cow Dung Based Low-Cost Adsorbent

The available conventional methods for the treatment of colored waste water are expensive and produce large amount of sludge at the end of the process. In many methods, adsorption is known to be a promising technique. Commercially available activated carbon from coal used as an adsorbent material is an expensive and non-renewable has restricts its use. Adsorbent from agricultural wastes and plant biomass are considered to be low-cost candidates. The adsorption of methylene blue dye on low coast adsorbent cow dung was studied under various conditions such as, contact time, concentration of adsorbate etc. Batch adsorptions experiments for the equilibrium data were represented using Freundlich, Langmuir and Temkin adsorption isotherm models. The mechanisms of the adsorption process based on the correlation coefficient values suggest that cow dung adsorbents are best fitted into Temkin isotherm concludes electrostatic interaction between adsorbate and adsorbent. It was observed that under current experimental conditions cow dung adsorbent is efficient for removal of dyes (~90 %) from the aqueous solutions. Thus, it discusses the potential of utilizing cow dung as a cheap and effective adsorbent.