Comparative Sorption Properties of Metal(III) Phosphates

The Sorption of Divalent Metal Ions on AlPO4

“…The spectrum also shows a weak absorption band at 1630 cm −1 and a broad band in between 3000 and 3500 cm −1 , which can be assigned to the OH bending and stretching, respectively. The vibration bands of the FTIR spectrum of AlPO 4 in the present study were observed to be similar to those reported in the literature (13,15).…”

Exchange Behaviour of Amorphous AlPO4 towards Cu2+ Ions

“…Similarly, the band observed at 3950 cm − 1 may be assigned to surface -OH groups which are perturbed due to the presence of the metal cations. This band was also observed in silicoaluminophosphates (Zecchina et al 1992) and is in support of our conclusions.…”

“…The characteristics of AlPO 4 were found to be the same as those reported previously by us (Mustafa et al 1995). Thus, X-ray diffractometry showed that it was amorphous, electron probe microanalysis showed the Al/P ratio to be 0.93 while the surface area was 49.3 m 2 /g.…”

“…Introducing the pH, the activities of the solids and constant H 2 O concentration, after necessary mathematical manipulation equation (5) transforms into the well-known Freundlich equation, (6) where Γ (mmol/g) is the amount of metal ions sorbed, C e (mmol/l) is the equilibrium concentration of metal ions in solution, K (l/g) is the equilibrium constant and x may be termed the stoichiometry of the exchange reaction. Equation (6), which has been reported previously by us (Mustafa et al 2003), may be applied to the sorption data for Cu 2+ ions as shown in Figure 6. The values of x and K calculated from slopes and intercept of the straight lines are reported in Tables 2 and 3, respectively.…”

“…However, very few researchers have taken into account the uptake properties of amorphous aluminium(III) phosphate which is one of the important constituents of soil and sediments (Mustafa et al 1995). The aim of the present study was to examine the interaction of Cu 2+ ions with amorphous aluminium phosphate as a function of concentration, pH and temperature.…”