Preparation of a novel biosorbent ISCB and its adsorption and desorption properties of uranium ions in aqueous solution
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A novel biosorbent—immobilized Saccharomyces Cerevisiae beads (ISCB) was prepared by the sodium alginate–gelatin embedding method after dry cells had been cross-linked by formaldehyde. The kinetic model can be described by the pseudo-second-order model well, its correlation coefficient R 2 is 0.9952 ± 0.051; and the isotherm models is fitted to Langmuir adsorption model. The maximum uranium biosorption capacity was calculated to be (163.9 ± 12.2 mg g−1), indicating that ISCB is a good biosorbent. The uranium adsorption percent p is over 90 % after ISCB have been regenerated 8 times using EDTA and HNO3, implying that the ISCB has a good reusability.
KeywordsUranium ions Adsorption isotherm Adsorption kinetics Desorption characteristics
This work was financially supported by the National Natural Science Foundation of China (Nos. 11205084, 11275090), the Foundation of Hunan Province Science and Technology Department (2014GK3079, 2012GK3132), and the social development and science and technology support of Hengyang city (No. 2014KS26). The helpful comments from anonymous reviewers are also gratefully acknowledged.
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