1976
DOI: 10.1016/0021-9797(76)90181-8
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Hydrolysis-precipitation studies of aluminum (III) solutions. 2. A kinetic study and model

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Cited by 123 publications
(49 citation statements)
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“…The 27A1 M A S -N M R spectrum of the solid obtained after precipitation with N a O H at pH 6.6-7.0 and drying of the same solution (OH/A1 = 2.0) showed that it still contained an appreciable amount of tetrahedral aluminum. Hem and Roberson (1967), Stol et al (1976), and Hsu (I 977) proposed a structure based on a six-membered ring [A16(OH) I 2)(H20)12] 6+ unit (Figure 3b) which condensed into larger bidimensional assemblies corresponding to a gibbsite-like or bayerite monolayer. From the potentiometric curves and the formulae of Sill~n (1954), Van Cauwelaert and Bosmans (1969) defined an average condensation unit having the formula [A17(OH),6] 5+ for the solutions having OH/A1 molar ratios of 0.5-1.6.…”
Section: Investigation Of the Hydroxy-al Solutionsmentioning
confidence: 99%
“…The 27A1 M A S -N M R spectrum of the solid obtained after precipitation with N a O H at pH 6.6-7.0 and drying of the same solution (OH/A1 = 2.0) showed that it still contained an appreciable amount of tetrahedral aluminum. Hem and Roberson (1967), Stol et al (1976), and Hsu (I 977) proposed a structure based on a six-membered ring [A16(OH) I 2)(H20)12] 6+ unit (Figure 3b) which condensed into larger bidimensional assemblies corresponding to a gibbsite-like or bayerite monolayer. From the potentiometric curves and the formulae of Sill~n (1954), Van Cauwelaert and Bosmans (1969) defined an average condensation unit having the formula [A17(OH),6] 5+ for the solutions having OH/A1 molar ratios of 0.5-1.6.…”
Section: Investigation Of the Hydroxy-al Solutionsmentioning
confidence: 99%
“…A range of polymeric A1 species has been proposed, but rather than a complete polydispersed system it appears that smaller polymers with less than about 15 A1 atoms may exist up to an OH/ A1 ratio of about 2, depending on electrolyte concentration. At higher OH/A1 ratios the polymers rapidly condense to produce a precipitate which ages quickly to gibbsite (Rengasamy and Oades, 1978;Stol et aL, 1976).…”
Section: Polycations Of Fe(iii) and Aimentioning
confidence: 99%
“…The pH values at the inflection points and the plateaus, and the OH/AI ratios at each pH were smaller for the more concentrated A1 solution (see also Stol et al, 1976). The second inflection and plateau became less pronounced and finally disappeared as the initial AI concentration was decreased below 5.7 • 10 -4 M. This was also reported by Frink and Sawhney (1967) for 10 -4 M solutions, and for 10 -5 M solutions at high titration speeds, and by Stolet al (1976) for 5 x 10 -5 M AI solution and for any A1 concentration when alkali was added dropwise to the surface of the solution without continuous stirring, creating locally 'higher-thanmean' concentrations of OH ions.…”
Section: Titration Curves Of Al(noa)3 Solutionsmentioning
confidence: 92%
“…(Frink and Sawhney, 1967;Vermeulen et al, 1975;Stol et al, 1976). From a theoretical treatment of the base titration of dilute AIC13 solutions, Turner (1968aTurner ( , 1968b predicted different shapes of titration curves depending on the A1 species assumed to be present in solution.…”
Section: Introductionmentioning
confidence: 99%