Effect of Chain Length of Alkane-1-Hydroxy-1, 1′-Methyldiphosphonic Acids on the Iron (Iii) Liquid–liquid Extraction

Functionalization of γ-Fe2O3 nanoparticles through the grafting of an organophosphorous ligand

“…This positive zeta potential is probably due, in addition to the positive charge from the surface of the ␥-Fe 2 O 3 nanoparticles at pH 5.15, to the protonation, at acidic pH, of the amine groups available at the surface of the nanoparticles. This phenomenon may compete with the deprotonation of the phosphonic head (pKa ∼ 3 and 6) [14] in the free ligands which are self assembled to the coordinated ligands via hydrogen interactions [21].…”

“…The IR spectrum of L is essentially characterized by a strong band at 1226 cm −1 attributed to the P O vibration band, and two strong bands at 997 and 943 cm −1 , attributed to the antisymmetric and symmetric P-OH vibration bands, respectively [14,22]. When going from L to ␥-Fe 2 O 3 @L nanoparticles, the P-OH vibration bands disappear, and the P O band is shifted from 1226 to 1090 cm −1 (Table 1), in line with the results published by Didi et al [14] for similar ligands complexed with Fe 3+ ions.…”

“…Mutin et al [12,13] showed that organophosphorus acids and their derivatives may be alternative and highly promising coupling molecules for the preparation of hybrid organic-inorganic materials, either by sol-gel processing or surface modification. Indeed, organophosphorous ligands (OPL) are actually known as excellent complexants of metallic ions and are frequently used in liquid-liquid extractions processes, particularly for concentration and purification of actinides, lanthanides and other polyvalent ions [14]. Recently, Yee et al [15] have functionalized amorphous Fe 2 O 3 particles with alkanesulfonic and octadecanephosphonic acids in ethanol, in order to study * Corresponding author.…”

Highly Efficient Extraction of Cadmium(II) in Nitrate Medium by Quarternary Ammoniums

“…More the hydrophobic character of the extractant is high, more the extraction is better [40]. Further, in the extractant concentration range from 50 mM -100 mM, it is found that the sequence of the extraction of Cd(II) in terms of the different forms of Aliquat 336 is the following: …”

Aminododecyldiphosphonic Acid for Solvent Extraction of Bismuth Ions

“…Thus, in chloroform that we used in our study, the ADDMDPA is generally present in a dimeric form, as shown in Figure 1 [11,12].…”