title: Preparation and biosorption evaluation ofBacillus subtilis/alginate-chitosan microcapsule.
abstract: The aim of this study was to assess the effect of alginate-chitosan microcapsule on viability characteristics ofBacillus subtilisand the ability ofB. subtilis/alginate-chitosanmicrocapsule to remove uranium ion from aqueous solution. The effects of particle size, chitosan molecular weight and inoculum density on viability characteristics were studied using alginate-chitosan microcapsule-immobilizedB. subtilisexperiments. In addition, the effects of pH, immobilized spherule dosage, temperature, initial uranium ion concentration and contact time on removal of uranium ion were studied using batch adsorption experiments. The results showed that alginate-chitosan microcapsule significantly improved the viability characteristics ofB. subtilisand thatB.subtilis/alginate-chitosan microcapsule strongly promoted uranium ion absorption. Moreover, the optimum values of pH was 6; immobilized spherule dosage was 3.5; temperature was 20°C; initial uranium ion concentration was 150 mg/L; contact time was 3 h of uranium ion absorption and the maximum adsorption capacity of uranium ion was 376.64 mg/g.
authors.affiliation: College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan, People's Republic of China.
authors.forename: Ke
authors.initials: K
authors.lastname: Tong
keywords: Bacillus subtilis; adsorption; alginate–chitosan microcapsule; uranium ion; viability characteristics