| 초록 |
Corynebacterium glutamicum waste biomass has potential to sorb reactive dyes in aqueous solutions. Due to practical difficulties in solid-liquid separation in the case of free biomass, immobilization technique was employed. Polyurethane (PU) was used for its possibility as immobilization matrix for the raw biomass. Experiments at different pH conditions revealed that PU-immobilized C. glutamicum performed well at acidic pH especially below 3. Biosorption isotherm experiments depicted that under pH 2 biosorption was higher. According to the Langmuir model, maximum Reactive Yellow 2 (RY2) uptakes of 104, 93.3 and 87.3 mg/g were observed at pH 2, 3 and 4, respectively. Pseudo-first- and pseudo–second-order models were also used to evaluate the biosorption kinetics. The latter model fitted the data well with high coefficient of determination. In an effort to enhance process economy, desorption was conducted at pH 9. Regeneration experimental results revealed that PU-immobilized C. glutamicum exhibited invariable RY2 uptake capacity with very high mechanical stability even at the end of fifth cycle. |
