Solvent impregnated carbon nanotube embedded polymeric composite beads: An environment benign approach for the separation of rare earths

Recovery of Rare Earth Elements by Carbon-Based Nanomaterials—A Review

“…Table 6 shows the studies of the recovery of REEs using carbon nanotubes composites. All the studies were performed in Milli-Q or distilled water, with the exception of only one study performed by Yadav et al [105] that used HCl (aq, 0.5 M). Regarding the contact time between the nanocomposite and the rare earth solution, there was a wide range of times used, although no studies published exceeded 96 hours and the majority had 2–4 h duration [98,105,106,107,108].…”

“…All the studies were performed in Milli-Q or distilled water, with the exception of only one study performed by Yadav et al [105] that used HCl (aq, 0.5 M). Regarding the contact time between the nanocomposite and the rare earth solution, there was a wide range of times used, although no studies published exceeded 96 hours and the majority had 2–4 h duration [98,105,106,107,108]. Temperature was tested between 20 and 65 °C, although most of the reported studies were performed at 30 °C [105,106,107].…”

“…The two elements most studied were lanthanum and europium. Sorption studies in multi-elemental systems were limited to a maximum of three elements by Tong et al [112] and Yadav et al [105]. A wide variety of concentration intervals is published (Table 6), from 30 µg/L [111] to 1,000,000 µg/L [105], being the most used concentrations between 10,000 and 40,000 µg/L.…”

“…Sorption studies in multi-elemental systems were limited to a maximum of three elements by Tong et al [112] and Yadav et al [105]. A wide variety of concentration intervals is published (Table 6), from 30 µg/L [111] to 1,000,000 µg/L [105], being the most used concentrations between 10,000 and 40,000 µg/L. The lower concentrations, namely 30 and 61 µg/L of Eu(III), in mono-elemental solutions, were reported by Chen et al [111] and Chen et al [109], respectively; moreover, K. Li et al [108], Koochaki-Mohammadpour [107] and Behdani et al [106] used 10 000 µg/L for different REEs like La(III) and Dy(III) or Ce(III) and Sm(III), in multi-elemental solutions.…”

Obtaining and studying composite material based on pani / cnt for extraction of rare metal ions

“…Түйіршіктелген синтетикалық органикалық шайырлармен салыстырғанда көбінесе кинетикалық сипаттамалары бар баламалы сорбциялық материалдар көміртекті сорбенттер-нанотүтікшелер мен графендер -сондай-ақ оларға негізделген композиттер болуы мүмкін [24][25][26][27].…”