Colloidal zirconium

As shown in Table II, there was an increase in sorption with increasing ionic strength at pH 7.1, the opposite being obtained at pH 5. Such phenomena may be explained in terms of the types of sorbing species postulated earlier. It has been shown (20, 21, 22) that the nature of the sorption of radiocolloids from aqueous solutions differs from ionic sorption. For example, Schubert and Conn (23) found that the sorption of colloidal zirconium and niobium on a cation exchanger increased with increasing electrolyte concentration, while addition of electrolyte effectively competed with and reduced sorption of the ionic species. 

TLV equals that of zirconium. Theoretically, zirconium carbonate dissolves in gastric acid, but it is converted into an insoluble colloidal zirconium compound in the gastrointestir tract, leading to poor resorption. ... 

The cold frit is crushed in equipment which is preferably totally enclosed to prevent personal contact with the irritant alkaline dust. Leaching is then carried out with water to remove sodium silicate and excess sodium hydroxide. About 7 tons of water per ton of zircon are appropriate, this quantity being divided between several successive leaching operations. Solid-liquid separation is by decantation between each leach. The sodium zirconate is finally filtered off in a fairly dry condition. It is advisable not to use a larger excess of water or peptization of colloidal zirconium com-... 

C. Colloidal Titanic Acid, Colloidal Zirconium Oxide and Colloidal... 

Estruga, M., Domingo, C., Domenech, X., and Ayllon, J.A. (2010) Zirconium-doped and silicon-doped Ti02 photocatalysts synthesis from ionic-liquid-like precursors. Journal of Colloid and Interface Science, 344 (2), 327-333. 

Dobson, E. L., Gofman, J. W., Jones, H. B., Kelly, L. S. and Walker, L. A. (1949). Studies with colloids containing radioisotopes of yttrium, zirconium, columbium and lanthanum. II. The controlled selective localization of radioisotopes of yttrium, zirconium and columbium in the bone marrow, liver, and spleen, J. Lab. Clin. Med. 34, 305. 

Seredych M, Bandosz TJ, Adsorption of ammonia on graphite oxide / aluminum polycation and graphite oxide/zirconium polyoxycations composites,/ Colloid Interface Sci. 2008, 324 25-35. 

Interfacial properties of zirconium dioxide and magnetite in water. J. Colloid Interface Sci. 91 560-570... 

Riedel WR, Hirschberg AK, Kaul A, et al. 1979. Comparative investigations on the biokinetics of colloidal thorium, zirconium, and hafnium dioxides in animals. Environ Res 28 127-139. 

Farad. Boc. xiv. 10,1921) for the composition of the sols and gels of the inorganic colloidal hydroxides, e.g. zirconia produced by the hydrolysis of zirconium oxychloride. By electropotentiometric measurements of the hydrogen and chlorine ion concentrations of sols formed by hydrolysis as well as freezing point, conductivity and transport number determinations he has shown that a series of salts are formed of the types ... 

The preparation of lyophilic sols is easy and most of the time a mixture of the dispersion medium and the substance to be dispersed need only be stirred. Gelatine, for example, disperses almost spontaneously in water. The hydroxides of iron, aluminium, chromium and zirconium as well as vanadium pentoxide and silicic acids all belong to the group of hydrophilic colloids. 

From the second cycle the plutonium goes through anion exchange for final purification (Fig. 21.21). The principal problem here is due to ruthenium, which is difficult to remove because of its many valence states. The uranium stream goes through silica sorption primarily to remove zirconium, which seems to be carried along as a colloid. 

Santacesaria E., Tonello M., Storti G. et al. Kinetics of titanium dioxide precipitation by thermal hydrolisis. J. Colloid Interface Sd. 1986 111 44-56. Reinten Kh.T. Equipment, preparation and properties of hydrated zirconium dioxide. In Structure and Properties of Adsorbents and Catalysts. Ed. Linsen B.G. Moskva Nauka, 1973, p. 332-83. 

Alberti, G., Casciola, M., and Costantino, U., Inorganic ion-exchange pellicles obtained by delamination of a-zirconium phosphate crystals, J. Colloid Interface Sci., 107, 256, 1985. 

Two classes of precursor have been demonstrated to prepare such zirconia colloids salts [4-7] and alkoxides [8-10]. Given the constraints above, the hydrothermal synthesis from zirconium salts [4,7] is especially attractive. The salt is easier to protect and handle than alkoxide precursors, and the product colloid does not require the removal of organics or dispersing agents before further aqueous processing. Bleier and Cannon [7] showed that one can easily make 80 nm monodisperse aqueous sols with no dispersing agents. 

Garg, A. and Matijevic, E. (1988 a). Preparation and properties of coated imi-form colloidal particles III.Zirconium hydrous oxide on hematite. J. Coll. Interface Sci. 126 243-250. 

Petroff, T.E., Sayer, M., and Hesp, S.A.M., Zeta potential modification of ceramic powders using zirconium hydrogel. Colloids Sutf. A, 78, 235, 1993. 

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