Hexavalent chromium removal by Osage Orange

► The aim is to develop a new adsorbent and to utilise them for chromium ions removal. ► This sorbent is first used as an adsorbent for the adsorption of Cr(VI) ions. ► These low-cost adsorbents are of abundantly available and biodegradable. ► Osage Orange can be used as low-cost adsorbents for the removal of Cr(VI) ions. This study explores the sorption potential of Osage Orange (Maclura Pomifera) for the removal of Cr(VI) ion. The influence of contact time, solution pH, initial metal concentration, amount of biosorbent and ionic strength on the removal of Cr(VI) ion was studied. The biosorption of Cr(VI) with pulp and peel was investigated in a batch arrangement. The initial and equilibrium concentrations of Cr(VI) ions in aqueous phase were determined by spectrophotometry. The sorption process was pH and concentration dependent. The sorption of Cr(VI) ions increased with a decreasing pH until pH 2. The increase in initial Cr(VI) ions concentration in aqueous phase increased the sorption. The sorption data fitted well with the Langmuir sorption model within the concentration range studied. The observed maximum biosorption capacity by Langmuir sorption model at pH of 2 for M. Pomifera pulp was 0.92mmol of Cr(VI)/g and for M. Pomifera peel was 0.55mmol of Cr(VI)/g.