The present study shows that the natural shellfish shells, an abundant low cost prawn waste, can be used as adsorbent for the removal of MB dye from aqueous solutions. The findings are: (1) The amount of dye adsorbed was found as function of initial pH, adsorbent dose, dye concentration and contact time. (2) The adsorption equilibrium data were found to fit the Langmuir isotherm, indicating a monolayer adsorption on a homogenous surface. (3) Lagergren pseudo-first-order, second order and intra-particle diffusion models can be used to predict the adsorption kinetics. (4) The adsorption mechanism was deduced with the help of mean free energy E. And (5) The adsorption efficiency of APR is greater than RPR for adsorption of MB from aqueous solution.