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Adsorption of Phosphate and Tartrate on Hydroxy-Aluminum–Oxalate Precipitates

^a Dipartimento di Scienze Chimico-Agrarie, Università di Napoli Federico II, 80055 Portici (Napoli), Italy
^b Dep. of Resources, Environment and Agrochemistry, Central China Univ. of Agriculture, Wuhan 430070, China

View larger version (21K): [in a new window]   Fig. 1 X-ray diffraction patterns of Al(OH)x and hydroxy-Al–oxalate precipitates generated from solutions with initial oxalic acid/Al molar ratios of 0.1 [Al(OH)OX1], 0.2 [Al(OH)OX2], and 0.5 [Al(OH)OX5]

View larger version (25K): [in a new window]   Fig. 2 Fourier transform infrared spectra of Al(OH)x, hydroxy-Al-oxalate precipitates generated from solutions with initial oxalic acid/Al molar ratios of 0.1 [Al(OH)OX1], 0.2 [Al(OH)OX2], and 0.5 [Al(OH)OX5], and a mixture of Al(OH)3 polymorphs (gibbsite and bayerite) well crystallized

View larger version (19K): [in a new window]   Fig. 3 (a) Phosphate and (b) tartrate adsorption envelopes on the Al(OH)OX5 precipitate when the ligands either were added alone or were added in mixtures of equimolar amounts (1000 mmol P and T kg-1) to the organomineral precipitate

View larger version (24K): [in a new window]   Fig. 4 Relationships between the amounts of phosphate sorbed on the Al–oxalate precipitate Al(OH)OX5 and the relative amounts of Al and oxalate solubilized, at pH 5.0 and in the presence of increasing tartrate/phosphate molar ratios (see Table 5). The number in parentheses indicates the initial tartrate/phosphate molar ratio. The linear equations describing the relationships are: Psorbed (mmol kg-1) = 1091.7 + -0.2827 Alsolubilized (mmol kg-1); R = 0.9906. Psorbed (mmol kg-1) = 1327.8 + -0.3356 Oxalatesolubilized (mmol kg-1); R = 0.98271