Removal and recovery of uranium (VI) from aqueous solutions by immobilized Aspergillus niger powder beads

Bioprocess and Biosystems Engineering
De-Xin DingYan Tan

Abstract

The immobilized Aspergillus niger powder beads were obtained by entrapping nonviable A. niger powder into Ca-alginate gel. The effects of pH, contact time, initial uranium (VI) concentration and biomass dosage on the biosorption of uranium (VI) onto the beads from aqueous solutions were investigated in a batch system. Biosorption equilibrium data were agreeable with Langmuir isotherm model and the maximum biosorption capacity of the beads for uranium (VI) was estimated to be 649.4 mg/g at 30 °C. The biosorption kinetics followed the pseudo-second-order model and intraparticle diffusion equation. The variations in enthalpy (26.45 kJ/mol), entropy (0.167 kJ/mol K) and Gibbs free energy were calculated from the experimental data. SEM and EDS analysis indicated that the beads have strong adsorption capability for uranium (VI). The adsorbed uranium (VI) on the beads could be released with HNO(3) or HCl. The results showed that the immobilized A. niger powder beads had great potential for removing and recovering uranium (VI) from aqueous solutions.

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Citations

Jul 26, 2015·Environmental Science and Pollution Research International·Jia-dong HeFei Xu
Jul 15, 2015·Environmental Science and Pollution Research International·Gulay BayramogluM Yakup Arica
May 29, 2016·Journal of Environmental Radioactivity·Can Chen, Jianlong Wang
Aug 20, 2018·Engineering in Life Sciences·Zdravka VelkovaVelizar Gochev

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