Separation and speciation of fission products by zirconium phosphate prepared by solid-solid reaction
TL;DR: In this article, the characterization of an inorganic ion exchanger was done with respect to capacity, pH titration, dissolution, etc., and the preconcentration and separation of fission products, Sr(II), Co-II, Eu-III, Gd(III), Hg(II) and Am(III) has been achieved from different acidic media, HCl, HNO3, H2SO4 and HClO4.
Abstract: Zirconium phosphate hase been prepared by solid-solid reaction. The characterization of this inorganic ion exchanger was done with respect to capacity, pH titration, dissolution, etc. The preconcentration and separation of fission products, Sr(II), Co(II), Eu(III), Gd(III), Hg(II) and Am(III) has been achieved from different acidic media, HCl, HNO3, H2SO4, HClO4. The speciation of these cations in different media has been investigated. From the results obtained, it is obvious that these cations can be preconcentrated in low acidic medium, whilst at high acidity in the range 1-2 M, they be can separated from each other.
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TL;DR: In this article, the ability of calcium phosphate with hydroxyapatite structure to adsorb Cr(VI) from aqueous solution is presented. But, the specific surface area of the synthesized powder was found to be 64.5 m 2 g 1.
Abstract: Calcium phosphate with hydroxyapatite structure was synthesized and its ability to adsorb Cr(VI) from aqueous solution is presented. XRD, BET, IR, TGA, SEM and EDS techniques were used to characterize the obtained material. A pure phase was obtained through a simple synthesis process. The specific surface area of the synthesized powder was found to be 64.5 m 2 g -1 . The X-ray diffraction pattern shows that the calcium phosphate formed was nanocrystalline with an average grain size of approximately 75 nm. A fast adsorption was observed and in less than 24 h it was found that 2.41 x 10 -4 meq g -1 of Cr(VI) ions were adsorbed on calcium phosphate. Desorption experiments showed that Cr(VI) adsorption decreased to 2.23 x 10 -4 meq g -1 of calcium phosphate. This behavior is a consequence of partial dehydration of the synthesized material. Calcium phosphate can be effectively used for removing Cr(VI) from aqueous solutions in treatment processes of metal wastes.
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TL;DR: In this article, the sorption behavior of 235U fission fission products 99Mo and 132Te was studied through batch and dynamic experiments when they were dissolved in 1 to 7M HNO3 solutions.
Abstract: The sorption behavior of 235U fission fission products 99Mo and 132Te was studied through batch and dynamic experiments when they were dissolved in 1 to 7M HNO3 solutions. It was found that 99Mo is always totally adsorbed on hydrated SnO2, while 132Te is rather weakly adsorbed, therefore they can be separated from each other although 132Te in the solution still remains contaminated with other radionuclides as well as 99Mo does in the solid.
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TL;DR: In this article, a nano material was obtained by dopping ZP in mesoporous nanocarbon which was prepared by physical activation carbon via thermal effect. But, the dopped ZP-C materials were heat-treated at various temperatures, 100-800 0 C.
Abstract: A nano material was obtained by dopping ZP in mesoporous nanocarbon which prepared by physical activation carbon via thermal effect .A series of ZP materials dopped in activated carbon obtained from DP by physical activation. The dopped ZP-C materials were heat-treated at various temperatures, 100–800 0 C. TGA & DTG thermal analysis showed that incorporation of the doping agent within the carbon DP layered materials which enhanced the heat-resistivity of the nanohybrid materials in the thermal decomposition pathway. Porous carbon materials can be obtained from the heat-treatment of the nanohybrids at 700 and 900 0 C. Calcination of the dopped material was achieved at 900 0 C under nitrogen atmosphere which produces mesoporous and high pore volume carbon materials. According to the kinetics of Freeman–Carroll and Coats–Redfern the calculated order of reaction of ZP in DP is 2. The calculated activation energy of both matrices are 402 and 350 kJ mol –1 . Key Words: Activated carbon; solid waste DP; physical activation; ZP; and nanotechnology
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01 Jan 1975
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"Separation and speciation of fissio..." refers background in this paper
...centration the Hg ions are hydrolyse and [Hg(OH)]+ is the predominant species which is less absorbable by the exchanger [13]....
[...]
...7 in HNO3 and HCl, respectively, the lower slope in this case may be due to the surface adsorption of the [HgNO3]+4 and[HgCl]+ species on the exchanger, besides the main ion exchange processes [13]....
[...]
37 citations
TL;DR: In this article, the light absorption spectra of americium(III) in concentrated aqueous lithium bromide, iodide and nitrate, magnesium iodide, potassium carbonate and nitric acid have been obtained, together with those of extracts into triisooctylammonium nitrate solutions in xylene.
27 citations