Sorption of some radionuclides from nuclear waste effluents by polyaniline/SiO2 composite: Characterization, thermal stability, and gamma irradiation studies

2020 ◽  
Vol 156 ◽  
pp. 109009 ◽  
Author(s):  
E.A. Abdel-Galil ◽  
A.S. Tourky ◽  
A.E. Kasem
Keyword(s):  
Thermal Stability ◽  
Gamma Irradiation ◽  
Nuclear Waste ◽  
Waste Effluents

Remediation of 137Cs radionuclide in nuclear waste effluents by polymer composite: adsorption kinetics, isotherms and gamma irradiation studies

2018 ◽  
Vol 316 (3) ◽  
pp. 933-945 ◽  
Author(s):  
Michael A. Olatunji ◽  
Mayeen U. Khandaker ◽  
Ekramul H. N. M. Mahmud ◽  
Yusoff Md. Amin ◽  
Janet A. Ademola ◽  
...  
Keyword(s):  
Gamma Irradiation ◽  
Polymer Composite ◽  
Nuclear Waste ◽  
Adsorption Kinetics ◽  
Waste Effluents ◽  
137Cs Radionuclide

Effect of gamma radiation on the structural, thermal and optical properties of PMMA/Sn0.75Fe0.25S2 nanocomposite

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali A. Alhazime ◽  
Nesreen T. El-Shamy ◽  
Kaoutar Benthami ◽  
Mai ME. Barakat ◽  
Samir A. Nouh
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Gamma Irradiation ◽  
Optical Band Gap ◽  
Color Variation ◽  
Nanocomposite Films ◽  
Color Changes ◽  
Gamma Irradiated ◽  
Intermolecular Crosslinking ◽  
Amorphous Part

AbstractNanocomposite films of polymethylmethacrylate PMMA with Sn0.75Fe0.25S2 nanoparticles (NPs) were fabricated by both thermolysis and casting techniques. Changes in PMMA/Sn0.75Fe0.25S2 nanocomposite (NCP) due to gamma irradiation have been measured. XRD results indicate that the gamma doses of 10–80 kGy cause intermolecular crosslinking that reduces the ordered portion in the NPs. Bonding between the NPs and the host PMMA was confirmed by FTIR. TGA results indicate an enhancement in thermal stability in the NCP films irradiated with doses 20–80 kGy. The optical band gap was reduced from 3.23 to 2.47 eV upon gamma irradiation up to 80 kGy due bonding between the NPs and PMMA which enhanced the amorphous part of the NPs. Finally, the color variation between the blank and irradiated films (ΔE) was determined. Color changes immensely when the PMMA/Sn0.75Fe0.25S2 NCP films are gamma irradiated. Values of ΔE were as much as 31.6 which is an acceptable match in commercial reproduction on printing presses.

The reactivity of bentonites: a review. An application to clay barrier stability for nuclear waste storage

Clay Minerals ◽  
1998 ◽  
Vol 33 (2) ◽  
pp. 187-196 ◽  
Author(s):  
A. Meunier ◽  
B. Velde ◽  
L. Griffault
Keyword(s):  
Thermal Stability ◽  
Nuclear Waste ◽  
Mineral Assemblage ◽  
Hydrothermal Systems ◽  
Initial Reaction ◽  
Nuclear Waste Storage ◽  
Waste Storage ◽  
Kinetics Of ◽  
Clay Barrier ◽  
Thermal Stability Of

AbstractThe thermal stability of bentonites is of particular interest for containment barriers in nuclear waste storage facilities. The kinetics of smectite reactions have been investigated under laboratory conditions for some time. The variables of time, chemical composition and temperature have been varied in these experiments. The results of such an assessment are that there are about as many kinetic values deduced from experiments as there are experiments.Experiments using natural bentonite to study the smectite-to-illite conversion have been interpreted as a progressive transformation of montmorillonite to illite. It is highly probable that the initial reaction product is not illite but a high-charge beidellite + saponite + quartz mineral assemblage which gives, then, beidellite-mica interstratified mixed-layer minerals. These experimental reactions are noticeably different from those of diagenesis, being closer to reactions in hydrothermal systems.

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