Dual-template docking oriented ionic imprinted bilayer mesoporous films with efficient recovery of neodymium and dysprosium

Zheng, Xudong; Zhang, Yi; Zhang, Fusheng; Li, Zhongyu; Yan, Yongsheng

doi:10.1016/j.jhazmat.2018.04.022

Cited by 69 publications

(15 citation statements)

References 40 publications

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“…Overall, this work suggests that the evaluated sorbents have a potential for the industrial REE separation process as an environmentally sustainable alternative to the conventional liquid–liquid extraction. Future work will focus on exploring novel SPE sorbents with a higher level of individual element recognition and separation, such as ion-imprinting techniques. ,− …”

Section: Discussionmentioning

confidence: 99%

Size-Selective Separation of Rare Earth Elements Using Functionalized Mesoporous Silica Materials

Castro

Drouin

et al. 2019

ACS Appl. Mater. Interfaces

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The separation and preconcentration of rare earth elements (REEs) from mineral concentrates in an economically and environmentally sustainable manner are difficult tasks due to their similar physicochemical properties. Herein, a series of tetradentate phenylenedioxy diamide (PDDA) ligands were synthesized and grafted on large-pore three-dimensional KIT-6 mesoporous silica. In solid-phase extraction, the hybrid sorbents enable a size-selective separation of REEs on the basis of the bite angles of the ligands. In particular, smaller REE3+ ions are preferentially extracted by KIT-6-1,2-PDDA, whereas light REEs with larger ionic radius are favored by KIT-6-1,3-PDDA. The exposure of bauxite residue digestion solution containing REEs as well as a number of types of competitive ions (including Th and U) to the sorbents results in selective recovery of target REEs. The possibility of regenerating the mesoporous sorbents through a simple loading–stripping–regeneration process is demonstrated over up to five cycles with no significant loss in REE extraction capacity, suggesting adequate chemical and structural stability of the new sorbent materials.

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Section: Discussionmentioning

confidence: 99%

Size-Selective Separation of Rare Earth Elements Using Functionalized Mesoporous Silica Materials

Castro

Drouin

et al. 2019

ACS Appl. Mater. Interfaces

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“…As shown in Figure 4, the adsorption isotherm of GO-CE-CS-PVA belongs to the IV type adsorption isotherm of the six adsorption isotherms classified by IUPAC. At a low relative pressure (0.0-0.05 P/P 0 ), owing to the strong interaction on the surface of the adsorbent, the adsorption capacity rises rapidly, and the curve is upwardly convex, forming a single-layer adsorption [26]. After the adsorbent reaches the saturated adsorption capacity, multi-layer adsorption is gradually formed, and the relative pressure of the multi-layer adsorption is between 0.05 and 0.75 P/P 0 .…”

Section: N2 Adsorption-desorption (Bet)mentioning

confidence: 99%

Crown Ether Grafted Graphene Oxide/Chitosan/Polyvinyl Alcohol Nanofiber Membrane for Highly Selective Adsorption and Separation of Lithium Ion

Zheng

Hua

et al. 2021

Nanomaterials

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Nanofiber membranes were successfully prepared with crown ether (CE) functionalized graphene oxide (GO), chitosan (CS), and polyvinyl alcohol (PVA) by low-temperature thermally induced liquid–liquid phase separation. The physical and chemical properties and adsorption performance of nanofiber membrane were studied through SEM, FT-IR, XRD, and static adsorption experiments. The results show that the specific surface area of the nanofiber membrane is as high as 101.5 m2∙g−1. The results of static adsorption experiments show that the maximum adsorption capacity of the nanofiber membrane can reach 168.50 mg∙g−1 when the pH is 7.0. In the selective adsorption experiment, the nanofiber membrane showed high selectivity for Li+ in salt lake brine. After five cycles, the material still retains 88.31% of the adsorption capacity. Therefore, it is proved that the material has good regeneration ability.

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“…Solid products are recovered through filtration, washed several times with deionized water and ethanol, and then dried. A mixture of ethanol and hydrochloric acid (ethanol/hydrochloric acid = 9/1, v/v) was washed for 1 week under reflux to remove the soft template in the material and complete the transformation to mesoporous solid material …”

Section: Methodsmentioning

confidence: 99%

“…A mixture of ethanol and hydrochloric acid (ethanol/hydrochloric acid = 9/ 1, v/v) was washed for 1 week under reflux to remove the soft template in the material 32 and complete the transformation to mesoporous solid material. 33…”

Section: Methodsmentioning

confidence: 99%

Preparation of Phosphoric Acid-Functionalized SBA-15 and Its High Efficient Selective Adsorption Separation of Lanthanum Ions

et al. 2020

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Phosphoric acid-functionalized mesoporous silica material was prepared by copolycondensation using P123 as the soft template and diethylphosphatoethyltriethoxysilane as the functional monomer. It was used for highly efficient selective adsorption and separation of La(III). By adjusting the ratio of the silicon source to functional monomer, the difference of the adsorption material structure and the change of adsorption performance were explored. When the ratio of the silicon source to functional monomer is 9/1, the phosphoric acid-functionalized SBA-15 (named S2) exhibits a highly ordered hexagonal cell structure. Saturated adsorption capacity of La(III) on S2 is 114.81 mg g −1 at 25 °C and 7.0 pH, which is much larger than other reported adsorbents. In addition, the adsorbent S2 has excellent adsorption kinetics: the adsorption equilibrium can be quickly concluded within 60 min. The distribution coefficient (K d ) of S2 to La(III) is 725 mL g −1 , and that of Nd(III) and other ions is about 200 mL g −1 . This indicates that the phosphoric acid-functionalized adsorbent has strong selectivity in the process of adsorption and separation of La(III). Cyclic performance tests indicate that the adsorbent has excellent regenerability. The above results indicate that the phosphoric acid-functionalized SBA-15 adsorbent (S2) has a promising application in the actual adsorption separation of La(III).

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Dual-template docking oriented ionic imprinted bilayer mesoporous films with efficient recovery of neodymium and dysprosium

Cited by 69 publications

References 40 publications

Size-Selective Separation of Rare Earth Elements Using Functionalized Mesoporous Silica Materials

Size-Selective Separation of Rare Earth Elements Using Functionalized Mesoporous Silica Materials

Crown Ether Grafted Graphene Oxide/Chitosan/Polyvinyl Alcohol Nanofiber Membrane for Highly Selective Adsorption and Separation of Lithium Ion

Preparation of Phosphoric Acid-Functionalized SBA-15 and Its High Efficient Selective Adsorption Separation of Lanthanum Ions

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