Investigation of the synergistic extraction behavior between cerium (III) and two acidic organophosphorus extractants using FT-IR, NMR and mass spectrometry

Chain Entanglement of 2-Ethylhexyl Hydrogen-2-Ethylhexylphosphonate into Methacrylate-Grafted Nonwoven Fabrics for Applications in Separation and Recovery of Dy (III) and Nd (III) from Aqueous Solution

“…After grafting, new peaks at 1730 and 1155 cm −1 , attributed to the C=O and C–O stretching of methacrylate, respectively, were observed ( Figure 2 b–e) [ 55 , 56 ]. After loading EHEP onto the OMA-grafted fabric, new peaks at 1250 (P–O–C), 1050 (P–O–C), and 980 (P=O) cm −1 were observed, as shown in Figure 2 f [ 25 ]. These results indicated that the methacrylate monomers were grafted onto the fabrics and EHEP was loaded onto the OMA-grafted fabric.…”

“…The most common method of recovering dysprosium and neodymium from waste materials involves leaching them in an acid solution and purifying the leached ions by solvent extraction [ 11 , 12 , 13 , 23 ]. Organophosphorus compounds such as 2-ethylhexyl hydrogen-2-ethylhexylphosphonate and di(2-ethylhexyl)phosphoric acid, carboxylic acid such as neodecanoic acid and naphthenic acid, and methyltrioctylamine chloride are usually used as extractants for rare-earth ions due to their good separation and recovery performance [ 22 , 23 , 24 , 25 , 26 ]. However, solvent extraction requires a large number of separation steps, a long processing time, and a large space for all necessary equipment.…”

Synthesis of Di-(2-ethylhexyl) Phosphoric Acid (D2EHPA)-Tributyl Phosphate (TBP) Impregnated Resin and Application in Adsorption of Vanadium(IV)

“…In Figure 9, the peaks at 2292 and 2300 cm −1 are assigned to the O-H vibration [21]. Three strong absorption peaks at 1230, 1234, and 1281 cm −1 were assigned to the P=O vibration [21,26]. According to Griffiths's theory [27], the weakening of the hydrogen bonds will increase the electron cloud density and the chemical bond constant of the O-H and P=O bonds, leading the vibration absorption peaks to move to a higher wavenumber.…”

“…The ESI mass spectra of D2EHPA and the mixture of D2EHPA and TBP, which are shown in Figure 7, are used to investigate the molecular forms of D2EHPA before and after the addition of TBP [26]. It can be seen that D2EHPA mainly exists as dimers (see the remarkable peak at m/z = 645.0 in Figure 7a) [26].…”

“…The ESI mass spectra of D2EHPA and the mixture of D2EHPA and TBP, which are shown in Figure 7, are used to investigate the molecular forms of D2EHPA before and after the addition of TBP [26]. It can be seen that D2EHPA mainly exists as dimers (see the remarkable peak at m/z = 645.0 in Figure 7a) [26]. However, it is obvious to see that two new peaks appear at m/z = 321.3 and m/z = 531.1, which are assigned to D2EHPA monomers and to TBP dimers, respectively, in the mixture of D2EHPA and TBP (Figure 7b).…”