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Popescu I.-C.,RandD National Institute for Metals and Radioactive Resources | Filip P.,C D Nenitescu Institute Of Organic Chemistry | Humelnicu D.,Al. I. Cuza University | Humelnicu I.,Al. I. Cuza University | And 2 more authors.
Journal of Nuclear Materials | Year: 2013

Carboxy-methyl-cellulose (CMC), a common "delivery vehicle" for the subsurface deployment of iron nanoparticles (INP) has been tested in the current work for the removal of aqueous uranium from synthetic water samples. A comparison of the removal of aqueous uranium from solutions using carboxy-methyl-cellulose with and without iron nanoparticles (CMC-INP and CMC, respectively) was tested over a 48 h reaction period. Analysis of liquid samples using spectrophotometry determined a maximum sorption capacity of uranium, Qmax, of 185.18 mg/g and 322.58 mg/g for CMC and CMC-INP respectively, providing strong evidence of an independent aqueous uranium removal ability exhibited by CMC. The results point out that CMC provides an additional capacity for aqueous uranium removal. Further tests are required to determine whether similar behaviour will be observed for other aqueous contaminant species and if the presence of CMC within a INP slurry inhibits or aids the reactivity, reductive capacity and affinity of INP for aqueous contaminant removal. © 2013 Elsevier B.V. All rights reserved.

Groza N.,RandD National Institute for Metals and Radioactive Resources | Manescu A.,Technical University of Civil Engineering Bucharest | Panturu E.,RandD National Institute for Metals and Radioactive Resources | Filcenco-Olteanu A.,RandD National Institute for Metals and Radioactive Resources | And 2 more authors.
Revista de Chimie | Year: 2010

The experimental study performed by wetland system using uranium contaminated water (8mg/L U, 4mg/L Mo) from the tailing pond located near uranium processing plant lead to the uranium removal rate about 95% comparing to 60 - 70% for conventional contaminated waste water treatment processes. The experiments were traced the high uranium imobilisation up to 0.4 mg/L after 80 days of process, the molibdenum and nitrates ions concentration monitoring and the optimum process parameters establishing. Using such wetland systems lead to advanced uranium waste water decontamination in accordance with the environmental quality standard.

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