| 초록 |
A low cost biomass, Corynebacterium glutamicum, generated in a great quantity from the full-scale fermentation process for the production of mono sodium glutamate (MSG), was evaluated as a biosorbent for the recovery of platinum from aqueous solution. A series of batch experiments, such as pH edge, isotherm and kinetic experiments, were undertaken to assess the sorption capacity. The pH was an important factor in biosorption process. The pH edge experiments revealed that acidic conditions, due to the protonation of amine groups, was found to favor Pt(IV) biosorption. The isotherm studies were carried out at pH 2.5 and 5.0, respectively, with maximum Pt(IV) uptake capacities recorded as 92.78 mg/g and 75.25 mg/g, respectively, after being fitted with Langmuir isotherm model. Kinetic studies revealed that the sorption process quickly happened within first 10 min, and then increased slowly until equilibrium obtained. Some chemicals, such as 3 M NaOH, 3 M HCl and 0.1 M acidic thiourea were chosen as eluents for desorption experiments. Acidic thiourea showed the best desorption efficiency of 73.9 %. |
