Search Results

You are looking at 1 - 3 of 3 items for

  • Author or Editor: D. Bilba x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

The distribution coefficients of204Tl(III) between DEAE-cellulose and HCl-water-organic solvent (alcohols and ketones) mixtures have been determined using the statical method. The hydrochloric acid concentration as well as the nature and concentration of organic solvent in the mixtures have been widely varied. Sorption of Tl(III) takes place through a combined process of ion exchange and physical adsorption, its distribution between the anionic cellulose and solvent mixture depends on the tendency of the ionic association formation in these media.

Restricted access

Abstract  

The aim of this paper is to define the characteristics of crystalline phase ETS-10 obtained from gel with dodecyltrimethylammonium bromide, as an organic template. ETS-10 zeolites has been synthesised under hydrothermal conditions from gels of composition 5Na2O–3KF–TiO2–6.4HCl– xC12TMAB –7.45SiO2–197.5H2O (where x=0.0, 0.25, 0.55, 1.0 and 1.5) with dodecyltrimethylammonium bromide. The crystalline phases synthesised with organic salt have an exothermal peak at ca. 360°C, due to the degradation of organic entrapped in the porous structure. Physical-chemical properties of C12TMAB -ETS-10 are studied by XRD, SEM and thermal analyses.

Restricted access

Abstract  

The microporous titanosilicate ETS-10 synthesized from gel with following molar composition: 1.0 Na2O: 1.49 SiO2 : 0.2 TiO2 : 0.6 KF : 1.28 HCl : 39.5 H2O was subjected to sorption of radioactive cations 115Cd2+, 204Hg2+, 60Co2+ and 137Cs+ (M) from aqueous solution, in the absence of ionic competition. The uptake of these cations on the ETS-10 was compared by means of the distribution coefficient (Kd) versus contact time and sorption capacity (R) at equilibrium. The FT-IR spectra of M-ETS-10 sorption products exhibit a modification of the absorption band, principally at 381 cm-1.

Restricted access