Magnetite nanoparticles with aminomethylenephosphonic groups: synthesis, characterization and uptake of europium(III) ions from aqueous media

Adsorption of Europium (III) on Amidoxime-Functionalized Ficus virens Aerial Root Hydrochar: Statistical Optimization, Equilibrium Isotherm, and Kinetic Analyses

“…Moreover, the R 2 and SEE values used to prove the best fit of isotherm model confirmed the distinction of the Langmuir model in explaining the adsorption behavior of Eu 3+ onto AO- f -ARHC. A comparative account of Eu 3+ adsorption by AO- f -ARHC based on Q m is presented in Table S4. − …”

Adsorption-based Separation and Recovery of Rare Earth Elements

“…However, since the adsorption capacity of these unmodified adsorbents is low (i.e., around 0.01-0.1 mmol/g) (Ehrlich & Lisichkin, 2017), it is impractical to employ these adsorbents for REE separation at an industrial scale. Source for data: Adsorbents 1-2 (Florek et al, 2014), 3-5 (Florek et al, 2015), 6-8 (Perreault et al, 2017), 9-13 (Juère et al, 2016), 14-16 (Hu et al, 2017, 17-20(pH is equilibrium pH) (Zhang et al, 2018), 21 (Artiushenko, Ávila, et al, 2020), 22-25 (Hu et al, 2019, 26-29 (Yantasee et al, 2009), 30 (Zheng et al, 2015), 31 (Amarasekara et al, 2009), 32 (Veliscek-Carolan et al, 2014, 33 (Ogata et al, 2015b), 34-36 (Giret et al, 2018, 37 (Li et al, 2018), 38 (Barrak et al, 2019), 39-40 (Lou et al, 2019), 41 (Kostenko et al, 2019).…”

“…REE uptake order was Dy(III) > Nd(III) > La(III) for EDTA-functionalized, Nd(III) > La(III) > Dy(III) for DTPA-functionalized, and La(III) > Nd(III) > Dy(III) for TTHA-functionalized adsorbent. Kostenko et al (2019) synthesized Fe 3 O 4 magnetic nanoparticles (MNPs) with and without a coating of silica and functionalized them with aminomethylenephosphonic (MNPs/SiO 2 -AMPA and MNPs/AMPA). The adsorption capacities for Eu(III) were 69 and 77 mg/g for MNPs/SiO 2 -AMPA and MNPs/AMPA at pH 7.0, respectively.…”

“…Similarly, for surface-functionalized adsorbents and ion-imprinted polymers, mineral acids are mostly used for the desorption of REEs. 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.…”

“…Diphonix was used to extract REE from the nitric acid solution from apatite processing on a pilot scale at Akron public corporation (Ehrlich & Lisichkin, 2017). However, there are lab studies in literature where various adsorbents have been used to separate REEs from various natural samples such as bauxite mud (Hu et al, 2019;Ochsenkühn-Petropulu et al, 1995;Roosen et al, 2016;ZHOU et al, 2008); Silicate & niobium mining deposits (Hu et al, 2017); apatite, orthite, and slag (Kostenko et al, 2019;Ogata et al, 2016); bastnäsite (Dolak et al, 2015), acidic mine drainage (Hermassi et al, 2021;Ramasamy et al, 2019;Ramasamy, Puhakka, Iftekhar, et al, 2018;; spiked seawater (Callura et al, 2018;Noack et al, 2016); spiked river/groundwater and sewage water (Marwani et al, 2018;Yantasee et al, 2009); geothermal brines , acidic streams, dialysate (Yantasee et al, 2009); REE mineral leachate (Giret et al, 2018); industrial wastewater (Li et al, 2013); leached solution of spent Ni-MH cells (Gasser & Aly, 2013;Ko lodyńska et al, 2019), thin-film phosphors leached solution (Schaeffer et al, 2017), phosphoric acid plant effluent (Al-Thyabat & Zhang, 2015), zinc mine ore (Fonseka et al, 2021), and coal fly ash (Brown & Balkus, 2021;Hovey et al, 2021;Mondal et al, 2019). These adsorbents showed varying degrees of success for REEs extraction (Figure 4).…”