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  • 1
    Electronic Resource
    Electronic Resource
    Sorption of As(V)-anions from aqueous solutions by organo-modified natural zeolitic materials (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 227 (1998), S. 183-186 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Natural zeolitic materials (sedimentary zeoliferous rocks) were organo-modified using polyhexamethyleneguanidine-chloride in order to enhance their anionic sorptive properties. The sorption of As(V)-anions from aqueous solutions [As(V) concentration range from 10 to 1000 mg/l] was investigated using radiochemical techniques. The samples exhibited an elevated tendency to sorb As(V)-anions (up to 6.73 mg/g) and the relative uptake was found to be much higher for solutions of low initial concentrations (up to 99.8% removal). The different As(V) species (mainly HAsO4 2−) are principally sorbed through ion-exchange reactions by the net of the polymeric, compound covering the mineral aggregates of the samples. The investigated materials could be considered for the removal of As(V) anionic species present in industrial or municipal wastewaters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386458
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  • 2
    Electronic Resource
    Electronic Resource
    Neodymium sorption by clay minerals and zeoliferous rocks (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 212 (1996), S. 421-429 
    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 neodymium from its aqueous solutions (concentration range approx. 10–450 mg l−1) by montmorillonite, kaolinite and a clinoptilolite-containing rock has been investigated, using147Nd as radioactive tracer and γ-ray spectrometry. The neodymium uptake by montmorillonite was found to be much higher than of the other two materials in the whole investigated concentration range. However, in the case of montmorillonite and zeoliferous rock, the uptake ability is lower than that allowed by the measured CEC values and can be described by Langmuir-type equations. In the case of kaolinite, the observed higher than CEC-allowed uptake values could be attributed to sorption by mechanisms other than ion-exchange. The corresponding data obey a Freundlich-type sorption equation. Among the three geological materials investigated, montmorillonite exhibits the highest perspectives of application for the treatment and disposal of neodymium and trivalent actinides in nuclear industry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163287
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  • 3
    Electronic Resource
    Electronic Resource
    Perrhenate ion uptake by aluminium hydroxide gels (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 208 (1996), S. 507-517 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The adsorption of perrhenate ions onto aluminium hydroxide gels was investigated. These gels were prepared by the sol-gel method in non aqueous solutions using a tertiary amine as template. They were amorphous and presented high specific surface areas. The amount of perrhenate ions adsorbed from aqueous solutions depended on the specific surface area of the gels. Removal of perrhenate ions up to 84% could be achieved without reaching saturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040068
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  • 4
    Electronic Resource
    Electronic Resource
    Heavy metal uptake by zeoliferous rocks from Metaxades, Thrace, Greece: An exploratory study (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 183 (1994), S. 159-166 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The uptake of mercury, cadmium and silver from aqueous solutions by unpretreated and NaCl-pretreated clinoptilolite-bearing volcaniclastic rocks from Metaxades (Thrace, Greece) has been studied using a batch method with radioactive tracers (197Hg,115Cd and110mAg). The concentration of the solutions used varied between approximately 1000 and 17000 ppm. An improvement of the uptake ability was observed in the case of NaCl-pretreated material for all the investigated metals and especially for mercury at the upper part of the concentration range studied. The heavy metal uptake is attributed to different mechanisms taking place both at the rock grains and their individual mineral components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02043129
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  • 5
    Electronic Resource
    Electronic Resource
    Uranium sorption from aqueous solutions on sodium-form of HEU-type zeolite crystals (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 208 (1996), S. 393-402 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The uranium sorption from aqueous solutions (concentration range 50–20.000 mg/l) by the sodium-form (Na-form) of HEU-type zeolite crystals (particle-size 〈20 μm) has been investigated by means of a batch-type method. The INAA, RI-XRF, powder-XRF, SEM-EDS and FT-IR techniques were used for the study of the experimental products. The absolute uranium uptake by the material reached the value of 11.68 mg/g in the case of initial concentraton 20,000 mg/l. On the other hand theK d -values indicated that the relative uranium uptake, and consequently the percentage of removal, is higher for concentrations below 100 mg/l. The uranium uptake by the zeolite is attributed to different sorption processes such as ion-exchange, adsorption and surface precipitation, taking place both to the interior and the surface of the crystals and strongly depending on the pH of the solutions. The investigated zeolitic material was sufficiently resistant at the low initial pH of the solutions with dealumination phaenomena only observed in the case of the most acidic solution used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040057
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of HEU-type zeolite crystals after interaction with Sr2+ cations in aqueous solution using nuclear and surface analytical techniques (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 241 (1999), S. 519-527 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Pure HEU-type zeolite (heulandite) crystals were allowed to interact with Sr2+ cations in aqueous solution. The powdered solid experimental products obtained from batch-type sorption experiments, using solutions of Sr2+-concentrations between 10 and 1000 mg/l, were investigated using INAA, RI-XRF and SEM-EDS. The Sr uptake by the mineral which can adequately be described with a Freundlich-type isotherm, varies from 3.14 to 6.22 mg/g. The distribution coefficients increase progressively by decreasing the solutions concentration reaching a value of 1800 ml/g. The investigated zeolite interacts with Sr2+ cations through ion exchange reactions and initial exchangeable Ca2+ cations are replaced into the structural micropores. However, in the best case, only ca. 43% of the theoretical CEC can be covered because of the limited availability of the extra framework Ca2+ cations that can be removed from the lattice under ambient treatment conditions. The XPS investigation of Sr-loaded single crystals indicated that adsorption of Sr2+ cations on the outer surface also occurs while surface precipitation phenomena must be excluded. Similar surface analyses by means of12C-RBS showed that the Sr depth-distribution at near-surface layers is quite homogenous in contrast to a previous relevant study revealing an intense surface Sr-accumulation on a natural Ca-zeolite of different structural characteristics (scolecite).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02347207
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