การขจัดไอออนทองแดงและแคดเมียมจากน้ำเสีย โดยการดูดซับบนไคโตซานรูปแบบต่างๆ / ทิพย์วิมล เกิดอิ่ม = Removal of copper and cadmium ions from wastewater by adsorption on various forms of chitosan / Thipwimon Kerd-im
To remove in Cu(II) and Cd(II) ion from wastewater by adsorption on various forms of chitosan such a flake, beads, cross-linked chitosan with glutaraldehyde (GLA), carboxylated chitosan beads and aminated chitosan beads. Chitosan modified beads were insoluble in aqueous acidic and basic solution. Adsorption of heavy metal was studied in a batch and continuous system. Batch adsorption experiment was carried out as a function of pH, initial concentration of metal ions and degree of deacetylation. In continuous system, the effect of industrial wastewater flow rate on Cu(II) adsorption on chitosan was considered. Additional, it found that copper adsorbed on the chitosan could be easily desorbed with an eluent containing 0.1 M nitric acid. Electrochemical method was used for recovery of copper from the eluent. Optimum pH for adsorption of Cu(II) on chitosan in each form was approximate 5. In case of Cd(II) ions adsorption on chitosan flake and chitosan bead, the optimum pH was approximate 5. Cd(II) ions adsorption on other form of chitosan bead had an optimum pH of 6. Aminated chitosan beads gave a uptake capacity adsorption of Cu(II) and Cd(II) ions up to 345 mg/g and 333 mg/g, respectively. The ebuilibrium adsorption data were found to be well described by Langmuir isotherm. In continuous system, the results showed that the removal of Cu(II) ion from industrial wastewater depended on flow rate of the wastewater. Regenerated of chitosan could be reused.
