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

Abstract

A nonwoven fabric adsorbent loaded with 2-ethylhexyl hydrogen-2-ethylhexylphosphonate (EHEP) was developed for the separation and recovery of dysprosium (Dy) and neodymium (Nd) from an aqueous solution. The adsorbent was prepared by the radiation-induced graft polymerization of a methacrylate monomer with a long alkyl chain onto a nonwoven fabric and the subsequent loading of EHEP by hydrophobic interaction and chain entanglement between the alkyl chains. The adsorbent was evaluated by batch and column tests with a Dy (III) and Nd (III) aqueous solution. In the batch tests, the adsorbent showed high Dy (III) adsorptivity close to 25.0 mg/g but low Nd (III) adsorptivity below 1.0 mg/g, indicating that the adsorbent had high selective adsorption. In particular, the octadecyl methacrylate (OMA)-adsorbent showed adsorption stability in repeated tests. In the column tests, the OMA-adsorbent was also stable and showed high Dy (III) adsorptivity and high selectivity in repeated adsorption–elution circle tests. This result suggested that the OMA-adsorbent may be a promising adsorbent for the separation and recovery of Dy (III) and Nd (III) ions.

Rationally Tailoring Pore and Surface Properties of Metal–Organic Frameworks for Boosting Adsorption of Dy3+

“…On the one hand, the host–guest electrostatic interaction is stronger due to its lowest zeta potential; on the other hand, the coordination interaction derived from free carboxyl (proved in Section ) contributes to the superior adsorption induced by the relatively rich carboxyl and the high specific surface area. Besides, a capacity of 150.6 mg g –1 was also found to be higher than those of most of the reported adsorbents, including carbon-based and silica-based materials, − ,− as listed in Table . The hierarchical porous ZIF-8 showed a much higher adsorption capacity than UiO-66-(COOH) 2 -B10 .…”

Separation of Adjacent Light Rare Earth Elements Using Silica Gel Modified with Diglycolamic Acid

“…Most of these adsorbents are designed to separate only REEs or REEs from other impurities such as Fe or Al. Focusing on the individual separation of REEs, there are several reports on the separation of HREE and LREE, such as the separation of Dy and Nd, and separation is possible [ 12 , 13 , 14 , 15 ]. However, there are no reports of effective adsorbents for adjacent REEs, such as Nd and Pr, and classical industrial methods must be used to separate individual REEs by adsorption.…”

A green attapulgite bacterial cellulose imprinted aerogel for selective adsorption and recovery of Dy(III)

“…Aerogel is a promising adsorption material, and BC can be directly formed into aerogel by conventional drying or freeze-drying. BC aerogel has high mechanical stability and biocompatibility, and it is a good material for adsorbing Dy(III) in water, but there are still problems such as the poor adsorption effect and the lack of adsorption selectivity (Hoshina et al 2020;Zhang et al 2021). Therefore, it is of great research signi cance to modify BC aerogel to improve the adsorption effect of the material.…”