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  • 1995-1999  (2)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Modeling of iron adsorption on HTTA-loaded polyurethane foam using Freundlich, Langmuir and D-R isotherm expressions (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 211 (1996), S. 283-292 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The sorption of Fe(III) at low pH range from 1 to 4.5 on open cell polyether type HTTA-loaded polyurethane foam has been carried out using batch technique. The optimum shaking time for 2.5· 10−4M solution of Fe(III) was found to be 30 minutes. The concept of macropore and micropore nature of polyurethane foam sorbent offers unique advantages of adsorption. Freundlich and Langmuir adsorption isotherms are followed at low concentration range from 1·10−4 to 3·10−4M solution of Fe(III). The Freundlich constant (1/n=0.46±0.013 andK=9.16±1.39 mg·g−1) and Langmuir isotherm constants(M=21.78 mg·g−1 andb=88.41±9.731·g−1) were established. The sorption mean free energyE=12.22±0.09 kJ·mol−1 and loading capacityC m =145.21±6.1 mg·g−1 were evaluated using Dubinin-Radushkevich isotherm, which suggested that the adsorption mechanism was chemisorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039698
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics and thermodynamic aspect of the adsorption of Fe(III) on HTTA-imbedded polyurethane foam (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 211 (1996), S. 293-303 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The batch kinetics of Fe(III) adsorption on HTTA-loaded polyurethane (PU) foam have been investigated. The rate of controlling the adsorption is found to be intraparticle diffusion. The reaction rate of adsorption and desorption was also evaluated and found to increase and decrease with temperature, respectively. This indicates an endothermic adsorption behavior of Fe(III) on HTTA loaded PU foam. The activation energy of adsorption (80±10 kJ·mol−1) and of desorption (−45±±2 kJ· mol−1) indicates the chemical adsorption rather than physical adsorption. The isosteric heat of adsorption (δH ads) was found to be −82.7±5.05 kJ·mol−1. This shows the formation of new chemical bonds among Fe(III)-HTTA-PU foam. The thermodynamic parameters of δG, δH and δS, and equilibrium constantK c have been calculated. These functions further support that the process of adsorption of Fe(III) on HTTA-loaded PU foam is endothermic and chemisorption, stabilized through thermodynamic functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039699
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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