Removal of Cr (VI) Ion by Modified Bean Husk

In this work, bean husk (BH) was used to remove Cr (VI) ion from synthetic aqueous solution. Batch experiments using closed plastic beakers were designed to obtain Cr (VI) ion sorption data. Bean Husk was modified by using citric acid. The parameter for modification was selected by trying different parameters such as time, temperature and citric acid quantity. In batch experiments, the influences of contact time, pH, adsorbent dose and initial chromium concentration was researched on adsorption process performance and adsorption isotherm for the equilibrium was studied on modified bean husk (MBH). The results showed that adsorption of Cr (VI) by (MBH) reached to equilibrium after 90 min and after that a little change of Cr (VI) removal efficiency was observed. Higher chromium adsorption was observed at lower pH such as pH around 2. The (MBH) in this study showed very good promise for practical applicability and can be an alternative biosorbent for the removal of Cr (VI) from aqueous solution