title: Reinforcement of carboxyl groups in the surface of Corynebacterium glutamicum biomass for effective removal of basic dyes.
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 (pH2) and basic conditions (pH11) 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.
authors.affiliation: Division of Environmental and Chemical Engineering and Research Institute of Industrial Technology, Chonbuk National University, Jeonbuk 561-756, Republic of Korea.
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Won
authors.forename: K
authors.initials: K
authors.lastname: Vijayaraghavan
authors.forename: Juan
authors.initials: J
authors.lastname: Mao
authors.forename: Sok
authors.initials: S
authors.lastname: Kim
authors.forename: Yeoung-Sang
authors.initials: YS
authors.lastname: Yun
mesh_terms: D000327:Adsorption / Q000187:drug effects; D001555:Benzene Derivatives / Q000494:pharmacology*; D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D011232:Chemical Precipitation; D004396:Coloring Agents / Q000302:isolation & purification*; D048230:Corynebacterium glutamicum / Q000187:drug effects* / Q000254:growth & development*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D007700:Kinetics; D008956:Models, Chemical; D009994:Osmolar Concentration; D010078:Oxazines / Q000302:isolation & purification*; D011108:Polymers / Q000494:pharmacology*; D012492:Salts / Q000494:pharmacology; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties / Q000187:drug effects; D013696:Temperature
chemical_list: D001555:Benzene Derivatives; D004396:Coloring Agents; D010078:Oxazines; D011108:Polymers; D012492:Salts; C513053:polyamic acid; C529709:Basic Blue 3