Authors:
Jiali Liao Sichuan University Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology Chengdu 610064 P.R. China

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Ning Liu Sichuan University Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology Chengdu 610064 P.R. China

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Yuanyou Yang Sichuan University Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology Chengdu 610064 P.R. China

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Shunzhong Luo CAEP Institute of Nuclear Physics and Chemistry Mianyang 621900 P.R. China

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Qiang Luo Sichuan University Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology Chengdu 610064 P.R. China

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Zhu An Sichuan University Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology Chengdu 610064 P.R. China

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Yanmin Duan Sichuan University Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology Chengdu 610064 P.R. China

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Mantian Liu Sichuan University Key Laboratory of Radiation Physics and Technology (Sichuan University), Ministry of Education, Institute of Nuclear Science and Technology Chengdu 610064 P.R. China

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Pengji Zhao CAEP Institute of Nuclear Physics and Chemistry Mianyang 621900 P.R. China

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Abstract  

As an important radioisotope in nuclear industry and other fields, 241Am is one of the most serious contamination concerns due to its high radiation toxicity and long half-life. Encouraging biosorption of 241Am from aqueous solutions by free or immobilized Rhizopus arrhizus (R. arrhizus) has been observed in our experiments. In this study, the preliminary evaluation on the mechanism was further explored via chemical or biological modification of R. arrhizus using europium as a substitute for americium. The results indicated that in approximately 48 hours R. arrhizus was able for efficient adsorption of 241Am. The pH value of solutions decreased gradually with the uptake of 241Am by R. arrhizus, implying that H+ was released from R. arrhizus via ion-exchange. The biosorption of 241Am by the decomposed cell wall of R. arrhizus was as efficient as by the intact fungus. The adsorption ratio for 241Am by deacylated R. arrhizus dropped, implying that carboxyl functional groups of R. arrhizus play an important role in the biosorption of 241Am. Most of the investigated acidic ions have no significant influence on the adsorption of 241Am, while saturated EDTA can strongly inhibit the biosorption of 241Am by R. arrhizus. When the concentrations of coexistent Eu3+, Nd3+ were 300 times more than that of 241Am, the adsorption ratios would decrease to about 86% from more than 99%. It could be noted by transmission electron microscope (TEM) analysis that the adsorbed Eu is scattered almost in the whole fungus, while Rutherford backscattering spectrometry (RBS) indicated that Ca in R. arrhizus have been replaced by Eu via ion-exchange. The change of the absorption peak structure in the IR spectra implied that there was complexation between metals and microorganism. The results implied that the adsorption mechanism of 241Am by R. arrhizus is very complicated involved ion-exchange, complexation process as well as nonspecific adsorption in the cell wall by static electricity.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)