The kinetics analysis of copper onto the Rhodospirillum was investigated. Under the experimental conditions, thebiosorption equilibrium was achieved within 45min, the most biosorption capacity could reach 48.23 mg·g-1. In order toanalyze the biosorption kinetics of Cu2+, the pseudo-first-order and the pseudo-second-order kinetic models were applied to thedata. The results showed that the pseudo-second-order kinetic model fitted well with the experimental dam. It was found thatEDTA and citric acid were the effective eluants for the elution of adsorbed copper by Rhodospirillum,the elution efficiencywere 86.4%, 66.9%, respectively. The abio-acid and the abio-salt were the noneffecive eluants,the elution efficiences were allabout 20%. The analysis of the X-ray diffraction spectra indicated that the bacteria did not form new crystal after the adsorptionand some of the crystal of the bacteria had transformed into non-crystal.
[1] Kolishka Tsekova,Danka Galabova.2002.Phosphatase activity and copper uptake during growth of Aspergillus niger[J].Process Biochmistry,37(4):753-758.
[2] Kathy Jalali,Susan A,Baldwin.2000.The role of sulphate reducing bacteria in copper removal from aqueous sulphate solutions[J].Elsevier Science Ltd,34(3):797-806.
[7] Arica M Y,Yasenmin K,Omer G 2001.Entrapment of white-rot fungus Trametes versicolor in Ca-alginate beads:preparation and biosorption kinetic analysis for cadmium removal from an aqueous solution[J].Bioresource Technology,80(4):12 1-129.
