1971
DOI: 10.1039/tf9716700999
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Ion-exchange equilibria of synthetic 4A zeolite with Ni2+, Co2+, Cd2+and Zn2+ions

Abstract: Linde 4A zeolite was converted to Ni, Co, Zn and Cd forms by replacing sodium ions with divalent cations. The replacement was from 82 % (Ni) up to 100 % (Cd). Chemical, T.G.A., D.T.A. and X-ray analysis of the divalent metal zeolites have been made and data on the composition of the unit cells and the thermal stability of the lattices were obtained. Ni-zeolite is unstable, its crystal lattice being completely destroyed above 70"C, whereas Co-, Zn-and Cd-zeolites are stable up to 750-850°C. The adsorption of wa… Show more

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Cited by 53 publications
(21 citation statements)
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“…Similar observations were made for zeolite 4A (Gal et al, 1971) and for natural Si-rich zeolites such as mordenite (Ni for NH/ exchange; Barrer and Townsend, 1976). The channels of the faujasite-type zeolites are significantly larger than zeolite-Pc and can host six types of exchangeable sites, including type-IV sites (Breck, 1974).…”
Section: Discussionsupporting
confidence: 70%
See 1 more Smart Citation
“…Similar observations were made for zeolite 4A (Gal et al, 1971) and for natural Si-rich zeolites such as mordenite (Ni for NH/ exchange; Barrer and Townsend, 1976). The channels of the faujasite-type zeolites are significantly larger than zeolite-Pc and can host six types of exchangeable sites, including type-IV sites (Breck, 1974).…”
Section: Discussionsupporting
confidence: 70%
“…The ion-exchange properties of many common synthetic zeolites such as NaX, NaY, and NaA were thoroughly examined in the past, mainly because of their wide utilization in detergents and ammonium exchangers (Sherry and Walton, 1967;Barrer et al, 1968aBarrer et al, , 1968bGal et al, 1971;Maes and Cremers, 1975;Townsend, 1981, 1982;Wiers et al, 1982;and many others). The use of zeolites in wastewater purification offers the advantage of a highly improved cation-exchange performance relative to natural counterparts.…”
Section: Introductionmentioning
confidence: 99%
“…The cation content may even exceed the theoretical value of 12 elementary charges per a cage, whereas the exchanging cation coneentration in the solution remains below the solubility limit. The equilibrium concentration of the divalent cation is almost zero up to an exchange level of 19% (for Ni z+) or 46% (for Cue+), a result which confirms the high selectivity of zeolite A towards divalent cations [3]. At higher exchange levels, the selectivity remains favourable for copper, but reverses for nickel, since the Ni2+/Na + ratio becomes higher in the aqueous phase than in the zeolite.…”
Section: Experimental Partsupporting
confidence: 54%
“…This method has the decided advantage of minimal associated waste generation, process simplicity, and ease of maintenance. Cobalt exchange from aqueous media using both synthetic (10)(11)(12)(13)(14)(15)(16)(17) and naturally occurring (17)(18)(19)(20)(21)(22) zeolites has been reported. The process of cobalt exchange with zeolites has been undertaken largely with the aim of preparing solid catalysts (23)(24)(25)(26).…”
Section: Introductionmentioning
confidence: 99%