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Träfflista för sökning "WFRF:(Abdel Magied Ahmed Fawzy) srt2:(2017)"

Sökning: WFRF:(Abdel Magied Ahmed Fawzy) > (2017)

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1.
  • Arafa, Wael Abdelgayed Ahmed, et al. (författare)
  • Utilization of ultrasonic irradiation as green and effective one-pot protocol to prepare a novel series of bis-2-amino-1,3,4-oxa(thia) diazoles and bis-tetrazoles
  • 2017
  • Ingår i: ARKIVOC. - : ARKAT USA, Inc.. - 1551-7004 .- 1551-7012. ; , s. 327-340
  • Tidskriftsartikel (refereegranskat)abstract
    • In an effective and straightforward conversion, bis-semicarbazones and bis-thiosemicarbazones are transformed into a diversity of novel substituted bis-2-amino-1,3,4-oxadiazoles and bis-2-amino-1,3,4-thiadiazoles, respectively under ultrasonic irradiation. Bis-tetrazoles are obtained from the dialdehydes by sequential reaction with hydroxylamine hydrochloride, phosphorus pentoxide and sodium azide without isolation of the intermediates oximes and nitriles. All the reactions proceed cleanly and smoothly under mild conditions, with short reaction times and broad functional groups possibility. No side reactions were observed. [GRAPHICS]
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2.
  • Fawzy Abdel-Magied, Ahmed (författare)
  • Solid phase extraction of uranium from phosphoric acid : kinetic and thermodynamic study
  • 2017
  • Ingår i: Radiochimica Acta. - : Walter de Gruyter GmbH. - 0033-8230 .- 2193-3405. ; 105:10, s. 813-820
  • Tidskriftsartikel (refereegranskat)abstract
    • There is a high interest to develop suitable solid phase extractants for uranium separation from aqueous solutions in order to reduce cost and enhance the efficiency. This paper describes solid phase extraction of uranium(VI) from aqueous phosphoric acid solution using MCM-41 based D2HEPA-TOPO organophosphorous extractants. The mixture of D2HEPA (di-2-ethyl-hexylphosphoric acid) and TOPO (tri-n-octylphosphine oxide) was impregnated into the pores of MCM-41 and the synthesized sorbent was fully characterized. The influences of different factors such as synergistic mixture ratio, phosphoric acid concentration, mixing time and temperature were investigated. The results showed that 90% of uranium(VI) extraction can be achieved within 5 min, using D2HEPATOPO@MCM-41 (mass ratio 2: 1 w/w) from 1 M phosphoric acid containing 64 ppm of uranium at room temperature. High adsorption capacity of uranium(VI) have been achieved at the mentioned conditions. The rate constant for the chemical adsorption of uranium(VI) was 0.988 g mg. 1 min. 1 calculated by the pseudo-second order rate equation. The obtained thermodynamics parameters showed that uranium(VI) adsorption from H-3 PO4 is an exothermic and spontaneous process.
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  • Resultat 1-2 av 2
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tidskriftsartikel (2)
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refereegranskat (2)
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Abdel-Magied, Ahmed ... (1)
Arafa, Wael Abdelgay ... (1)
Fawzy Abdel-Magied, ... (1)
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Stockholms universitet (2)
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Engelska (2)
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Naturvetenskap (2)
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2017 (2)Ta bort avgränsningen

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