Reinforcement of carboxyl groups in the surface of Corynebacterium glutamicum biomass for effective removal of basic dyes |
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Authors: | Sung Wook Won K. Vijayaraghavan Juan Mao Sok Kim Yeoung-Sang Yun |
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Affiliation: | aDivision of Environmental and Chemical Engineering and Research Institute of Industrial Technology, Chonbuk National University, Jeonbuk 561-756, Republic of Korea;bDepartment of Bioprocess Engineering, Chonbuk National University, Jeonbuk 561-756, Republic of Korea |
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Abstract: | The biomass of Corynebacterium glutamicum was treated with poly(amic acid) to improve the biosorption of Basic Blue 3 (BB3) from aqueous solution. The grafting of poly(amic acid) onto the biomass surface increased the density of the carboxyl groups. The UV-spectrum revealed that strong acidic (pH 2) and basic conditions (pH 11) resulted in the precipitation of BB3. Therefore, pH edge experiments were conducted only within the range 3–10; these results indicated that electrostatic attraction between carboxyl groups of C. glutamicum and BB3 dye cations was favored under alkaline conditions. From the Langmuir model, poly(amic acid)-modified biomass gave a maximum uptake of 173.6 mg/g at pH 9, compared to 52.8 mg/g by the raw biomass. The biosorption kinetics was found to be fast; with equilibrium attained within 10 min. The increase in the ionic strength strongly affected the uptake of BB3 for both forms of C. glutamicum. |
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Keywords: | Biosorption Basic dye Corynebacterium glutamicum Surface modification |
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