Recovery of lanthanum, praseodymium and samarium by adsorption using magnetic nanoparticles functionalized with a phosphonic group

Modeling and equilibrium studies on the recovery of praseodymium (III), dysprosium (III) and yttrium (III) using acidic cation exchange resin

“…Comparison of REEs/Dowex 50WX8 system under the used optimum conditions of batch technique with other commercially reported materials [ 18 , 32 – 51 ] and given in Table 4 , shows the advantages and efficiency of Dowex 50WX8 adsorbent. The results of comparison in the term of maximum capacity (Q 0 ) (30, 50, 60 mg/g for Pr, DY and Y), pH = 1, and contact time (15 min) and which were achieved in the current study indicate that Dowex 50WX8 is more efficient and affordable than other reported materials.…”

Adsorption-based Separation and Recovery of Rare Earth Elements

“…Other research involving coated magnetic nanoadsorbents for REEs adsorption include silica-coated magnetic particle grafted with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl (P507) using 3-chloropropyltryethosysilane as silane-coupling agent (Wu et al, 2013) and magnetic Fe 3 O 4 coated with SiO 2 and TiO 2 and modified with N-[(3-trimethoxysilyl) propyl] EDTA (TMS-EDTA) (Dupont et al, 2014). Some studies have directly functionalized the magnetic nano-particles (Chen et al, 2012;Gaete et al, 2021;Ngomsik et al, 2012;Yang et al, 2012). Citric acid-functionalized maghemite nanoparticles had q m of 74.4 mg/g and 71 mg/g for Eu(III) and La(III), respectively (Ngomsik et al, 2012), Magnetic nano-particles Fe 3 O 4 with humic acid coating (Fe 3 O 4 @ HA MNPs) synthesized through chemical coprecipitation was able to remove 99% of Eu(III) at pH 8.5 (Yang et al, 2012).…”

“…In another study, bentonite was used as a support to prepare di (2-thylhexly) phosphoric acid-immobilized magnetic GMZ bentonite and was used to adsorb Eu(III) (capacity of 48.02 mg/g at pH 3.05) (Chen et al, 2012). Another adsorbent, phosphonic acid-functionalized magnetite nanoparticle (PA-MNP), showed a capacity of 18.4, 17.6, and 23.9 mg/g for La(III), Pr(III), and Sm(III), respectively at pH 4 (Gaete et al, 2021).…”

“…The strength of the acid solution used for desorption has varied from 0.1 M HCl to 2.0 M HCl (e.g., 0.1 M HCl Kostenko et al, 2019; Y.-R. Lee et al, 2018;Ryu et al, 2021), 0.25 M HCl (Hua et al, 2019), 0.3 M HCl (Lou et al, 2019), 0.5 M HCl , 1.0 M HCl (Babu et al, 2018;Gasser et al, 2017;Moussa et al, 2017), 2 M HCl (Li et al, 2019;Qin et al, 2022;Yusoff et al, 2017), and 1.0-2.0 M HCl (Ogata et al, 2015a)). Other mineral acids such as HNO 3 with the strength of 0.01-6.55 M (Ashour et al, 2017;Shuangyou Bao et al, 2022;Bertelsen et al, 2019;Callura et al, 2018;Noack et al, 2014;Rahman et al, 2020;Ravi, Zhang, et al, 2018;Zhao et al, 2021) and H 2 SO 4 (e.g., 0.1 M -1 M H 2 SO 4 (Ogata et al, 2015a) , 0.1 M H 2 SO 4 (Gaete et al, 2021)) have been used as well. Mineral acids have usually provided desorption in the order of 90-100% for functionalized adsorbent and ion-imprinted polymers.…”

High-efficiency and durable glycerol-based reactive flame retardants for cotton fabric

“…The absorption peak at 1234 cm À1 was attributed to P¼O stretching vibration, and the absorption peak at 816 cm À1 was assigned to the P-O-H peak. 29 The absorption peak at 1703 cm À1 was assigned to the C¼O vibration, the C¼O group may generate from oxidation of the glucosidic bond of cellulose molecule under high temperature acid condition. 30 The absorption peak at 1050 cm À1 was enhanced, which was caused by -P(¼O)-O-C-covalent bonds between cellulose and ATPAGE, suggesting that ATPAGE was successfully grafted into the cellulose.…”