Monitoring and extraction of uranium in polluted acid mine drainage by super-paramagnetic nanoparticles coated with carbon nanodots
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In this contribution, we designed environmentally friendly magnetic nanoparticles for simultaneously monitoring and efficiently extracting uranium (VI) from polluted acid mine drainage (>99% of the total uranium amount). The nanoparticles consist of super-paramagnetic core made of Fe3O4, which is chemically coated with highly-fluorescent shell made of carbon nanodots. The small nanoparticle diameter enables good water dispersibility, high mobility in suspension and powerful sorbent activity to U(VI) in the presence of sulfates, bicarbonates, and pH 4.3–4.8. The measured detection limit of uranium (VI) in model solutions of acid mine drainage was found to be around 0.8 ppm.
KeywordsEnvironmenat friendly super-paramagnetic nanoparticles Carbon nanodots Uranium monitoring and extraction
The authors are grateful to Saitama University for the financial support of this work. The investigations about nanoparticle synthesis and characterization were performed at Saitama University, Japan with the contribution of Ms. Hibiki Udono and Mr. Ryo Takakura. The AFM and TEM observation at Saitama University was done with the contribution of Dr. Naritaka Kobayashi and Dr. Ryuzo Kawamura. All experiments with uranium (VI) are done in the University of Mining and Geology “St. Ivan Rilski”-Bulgaria with the contribution of Dr. Alexandre Loukanov. We would like to thank to Prof. Takashi Fujihara (Saitama University) for the FT-IR measurements and to Dr. Margarita Georgieva from the Journal of Formal, Informal and Natural Education (www.journalfine.com) for proofing and editing this text.
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