Removal of heavy metal from industrial wastewater using chitosan coated oil palm shell charcoal

• Main Authors: Nomanbhay S.M., Palanisamy K.
• Other Authors: 22135844300
• Format: Article
• Published: Electronic Journal of Biotechnology 2023
• Subjects: Chitosan bioabsorbent; Chromium (III); Chromium (IV); Heavy metal adsorption; Oil palm shell charcoal; Elaeis; Adsorption; Bioconversion; Charcoal; Contamination; Isotherms; Mathematical models; Phase equilibria; Wastewater; charcoal; chitosan; chromium; heavy metal; metal ion; palm oil; Industrial wastewater; Langmuir isotherm models; Metal ions; Oil palmshell charcoal; adsorption; article; biosorption; biotransformation; cost effectiveness analysis; heavy metal removal; isotherm; nonhuman; plant tissue; temperature; waste water; Heavy metals

This research focuses on understanding biosorption process and developing a cost effective technology for treatment of heavy metals-contaminated industrial wastewater. A new composite biosorbent has been prepared by coating chitosan onto acid treated oil palm shell charcoal (AOPSC). Chitosan loading on the AOPSC support is about 21% by weight. The shape of the adsorbent is nearly spherical with particle diameter ranging 100?150 ?m. The adsorption capacity of the composite biosorbent was evaluated by measuring the extent of adsorption of chromium metal ions from water under equilibrium conditions at 25�C. Using Langmuir isotherm model, the equilibrium data yielded the following ultimate capacity values for the coated biosorbent on a per gram basis of chitosan: 154 mg Cr/g. Bioconversion of Cr (VI) to Cr (III) by chitosan was also observed and had been shown previously in other studies using plant tissues and mineral surfaces. After the biosorbent was saturated with the metal ions, the adsorbent was regenerated with 0.1 M sodium hydroxide. Maximum desorption of the metal takes place within 5 bed volumes while complete desorption occurs within 10 bed volumes. Details of preparation of the biosorbent, characterization, and adsorption studies are presented. Dominant sorption mechanisms are ionic interactions and complexation. � 2005 by Pontificia Universidad Cat�lica de Valpara�so.