Time filter

Source Type

Nie X.,Sichuan University | Nie X.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Dong F.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Liu N.,Sichuan University | And 4 more authors.
Journal of Radioanalytical and Nuclear Chemistry | Year: 2014

Phaseolus vulgaris L. (bean) is a promising species for uranium rhizofiltration with high tolerance and accumulation ability. To further understand the mechanisms involved in uranium tolerance and detoxification, the present study investigated subcellular distribution and compartmentalization of uranium in bean. Subcellular fractionation of uranium containing tissues indicated that both in roots and shoots, the concentration of uranium in each subcellular fractions increased evidently with increasing solution uranium level, and the majority of uranium was located in cytosol and cell wall fraction, while a minor part of uranium associated with the organelle fraction. Meanwhile, with uranium concentration increasing from 100 to 1,000 μM, the proportion of uranium distribution in cytosol fraction was decreased but it was increased in cell wall fraction. However, the proportion of uranium distribution in organelle fraction is always less than 5 %. These results suggest that stored in the cytosol (such as uranium compartmentalization with organo-ligands in vacuole) and bound to the cell walls (may be integrated with polyose and protein) might play an important role in tolerance and detoxification of uranium in bean. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Nie X.-Q.,Sichuan University | Nie X.-Q.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Dong F.-Q.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Liu M.-X.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2013

The platanus leaves were used as adsorbent to study uranium removal efficiency from aqueous solution on the basis of adsorption kinetics and isotherm equations. Static adsorption affected by initial pH values and contact time was analyzed, and surface characteristics of platanus leaves and uranium removal mechanism were investigated with the help of SEM, FTIR, XRD and XRF. The adsorption process fits pseudo-second-order kinetic model and Freundlich isotherm equation, and the maximum adsorption capacity for uranium was 19.68 mg·g-1. Results showed that hydroxyl groups, amides II belt and carboxyl active functional groups were important for uranium removal. Structure characteristic adsorption band of cellulose was found in XRD spectra, uranium was detected, and also Ca and Na elements of the content increased. Mg element content relative decrease was found on platanus leaves after adsorption by XRF, and it proved the reaction feasibility. Speculation for the behavior of uranium adsorption by platanus leaves was both physical adsorption and chemical adsorption, exhibiting joint action of electrostatic attraction, redox reaction, chelating ligand and ion exchange.


Zhu W.-K.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Mu T.,China Academy of Engineering Physics | Duan T.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Zhang Y.-K.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Luo X.-G.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

The strontium carbonate precipitate was induced using enzymes in the microbe reproduction and the morphology, structure and thermal decomposition properties of the strontium carbonate precipitates were characterized by EDS, SEM, FTIR, XRD, DSC-TGA. The results indicate that strontium carbonate precipitate induced in microbe contains a small amount of organic matters and has sphere-like shaped structure with porous surface, and its crystal belongs to orthorhombic crystalline. Bacteria and metabolites play an important role in the process of crystal nucleation, growth and accumulation of strontium carbonate.


Zhu W.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Mu T.,China Academy of Engineering Physics | Duan T.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Zhang Y.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory | Luo X.,Fundamental Science on Nuclear Waste and Environmental Security Laboratory
Research of Environmental Sciences | Year: 2015

The solidifying of Sr2+ by carbonate mineralization bacteria, Bacillus pasteurii, in an aqueous solution was investigated. CO3 2- was produced by the enzyme digestion process of the species when urea was decomposing. Biochemical properties of urease from bacteria were involved in transforming free radioactive Sr2+ into stable SrCO3. Various analysis and testing techniques, such as EDS, SEM, XRD and FT-IR, were used to analyse the precipitate. The experimental results showed that the microbiologically-induced SrCO3 crystal particles have porous surface in chaotic sizes, bonding together forming irregular groups. Concentrations, cultivation time and urea concentrations of Sr2+ influenced the forming of SrCO3 crystal morphology. It was also found that the bacteria participate in the progress of carbonate mineralization bacteria induced Sr2+ mineralization as nucleation sites. The solidifying rate reached a peak of 98.32% when the Sr2+ concentration was set as 0.05 mol/L, urea concentration was 30 g/L and pH was 8, cultivation was at 30℃ for 72 h, and therefore radionuclide stabilization treatment could be achieved. ©, 2015, Editorial department of Molecular Catalysis. All right reserved.

Loading Fundamental Science on Nuclear Waste and Environmental Security Laboratory collaborators
Loading Fundamental Science on Nuclear Waste and Environmental Security Laboratory collaborators