A facile solvent-free and one-step route to prepare amino-phosphonic acid functionalized hollow mesoporous silica nanospheres for efficient Gd(III) removal

Yin, Weiyan; Liu, Liangyi; Zhang, Haoyue; Tang, Sai Hong; Chi, Ruan

doi:10.1016/j.jclepro.2019.118688

Cited by 27 publications

(14 citation statements)

References 46 publications

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“…To achieve the enrichment of Gd(III) on the surface of PAN-Phos fibers, the reaction equation for the ion exchange between Gd(III) and phosphite is shown below Gd 3 + + ( − PO 3 H 2 ) ↔ false[ Gd ( − PO 3 H ) false] 2 + + normalH + Gd 3 + + ( − PO 3 H 2 ) ↔ false[ Gd ( − PO 3 ) false] + + 2H + Gd 3 + + 2 ( − PO 3 H 2 ) ↔ false[ Gd false( prefix− PO 3 normalH false) 2 false] + + 2H + …”

Section: Resultsmentioning

confidence: 99%

“…30 The hollow mesoporous silica nanospheres were modified with the amino-phosphonic acid groups by a one-step reaction of phosphate with cyanide hollow SiO 2 , under solvent-free conditions and applied for the removal of Gd(III) from wastewater. 31 The maximum adsorption capacity of the aminophosphonic acid-functionalized material for Gd(III) is 387.3 mg•g −1 .…”

Section: ■ Introductionmentioning

confidence: 99%

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Recyclable Amino-Phosphorylated Polyacrylonitrile Fiber for Gd(III) Adsorption in Aqueous Solution

Zhang

Feng

et al. 2022

ACS Appl. Polym. Mater.

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The development of rare earth adsorbents with high adsorption capacity, outstanding selectivity, and excellent reusability is important for the enrichment and recovery of rare earth elements. The adsorption of the rare earth ion Gd(III) by a phosphorylated polyacrylonitrile fiber was investigated. In this work, the adsorbent was synthesized by a simple and cost-effective grafting method using polyacrylonitrile (PAN) fibers as the substrates. The FTIR analysis, SEM, XPS, and TGA indicated the successful synthesis of polyacrylonitrile-phosphite (PAN-Phos) fibers. To evaluate the feasibility of PAN-Phos fibers as the potential adsorbents for Gd(III) removal, a series of adsorption experiments were conducted. The pseudo-second-order kinetic model better illustrated the adsorption of Gd(III) on PAN-Phos fibers, and equilibrium adsorption was achieved within 50 min; the maximum adsorption capacity was 120.9 mg·g–1. The PAN-Phos fibers also exhibited excellent reproducibility after four adsorption cycles. In addition, the results of various analyses indicated that the adsorption mechanism of Gd(III) on PAN-Phos fibers was mainly through the synergistic complexation of secondary amine and phosphoric acid groups. It provided a practicable way for the synthesis and preparation of rare earth adsorbent materials.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Recyclable Amino-Phosphorylated Polyacrylonitrile Fiber for Gd(III) Adsorption in Aqueous Solution

Zhang

Feng

et al. 2022

ACS Appl. Polym. Mater.

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“…Tables S9 and S10 compare the sorption performances of a series of sorbents for Nd(III) and Gd(III), respectively. Some sorbents have remarkable performances, such as calixarene-functionalized graphene oxide composite, [ 68 ] carboxylic acid-modified corn stalk gel for Nd(III) [ 69 ], carbon nanotubes/graphene oxide [ 70 ], amino-phosphonic functionalized hollow silica nanospheres [ 71 ], or DTPA-chitosan/magnetite for Gd(III) [ 72 ]. Except for these “super-adsorbents,” the composite functionalized sorbent (NH 2 /SiO 2 ) show comparable sorption properties for the two REEs with the most efficient sorbents.…”

Section: Resultsmentioning

confidence: 99%

Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO2 Composite

et al. 2021

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The strong demand for rare-earth elements (REEs) is driven by their wide use in high-tech devices. New processes have to be developed for valorizing low-grade ores or alternative metal sources (such as wastes and spent materials). The present work contributed to the development of new sorbents for the recovery of rare earth ions from aqueous solutions. Functionalized mesoporous silica composite was synthesized by grafting diethylenetriamine onto composite support. The physical and chemical properties of the new sorbent are characterized using BET, TGA, elemental analysis, titration, FTIR, and XPS spectroscopies to identify the reactive groups (amine groups: 3.25 mmol N g−1 and 3.41 by EA and titration, respectively) and their mode of interaction with Nd(III) and Gd(III). The sorption capacity at the optimum pH (i.e., 4) reaches 0.9 mmol Nd g−1 and 1 mmol Gd g−1. Uptake kinetics are modeled by the pseudo-first-order rate equation (equilibrium time: 30–40 min). At pH close to 4–5, the sorbent shows high selectivity for rare-earth elements against alkali-earth elements. This selectivity is confirmed by the efficient recovery of REEs from acidic leachates of gibbsite ore. After elution (using 0.5 M HCl solutions), selective precipitation (using oxalate solutions), and calcination, pure rare earth oxides were obtained. The sorbent shows promising perspective due to its high and fast sorption properties for REEs, good recycling, and high selectivity.

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“…All the uptake experiments were conducted in triplicate, and the uptake capacities (mg/g) and removal efficiency (R, %) were calculated by [ 32 , 33 , 34 ]:

where C 0 and C t are the initial and equilibrium concentrations of the Ce(III) ions, respectively, while m (mg) and v (mL) represent the adsorbent weight and the Ce(III) solution volume, respectively.…”

Section: Methodsmentioning

confidence: 99%

Green Preparation of Aminated Magnetic PMMA Microspheres via EB Irradiation and Its Highly Efficient Uptake of Ce(III)

et al. 2022

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The modification of polymers can significantly improve the ability to remove rare earth ions from wastewater, but so far few studies have focused on the irradiation-induced grafting method. In this study, a novel magnetic chelating resin for Ce(III) uptake was first synthesized by suspension polymerization of PMMA@Fe3O4 microspheres followed by irradiation-induced grafting of glycidyl methacrylate (GMA) and subsequent amination with polyethyleneimine (PEI). The FT-IR, SEM, TG and XRD characterization confirmed that we had successfully fabricated magnetic PMMA-PGMA-PEI microspheres with a well-defined structure and good thermal stability. The obtained adsorbent exhibited a satisfactory uptake capacity of 189.81 mg/g for Ce(III) at 318.15 K and an initial pH = 6.0. Additionally, the impact of the absorbed dose and GMA monomer concentration, pH, adsorbent dosage, contact time and initial concentration were thoroughly examined. The pseudo-second order and Langmuir models were able to describe the kinetics and isotherms of the adsorption process well. In addition, the thermodynamic data indicated that the uptake process was spontaneous and endothermic. Altogether, this research enriched the Ce(III) trapping agent and provided a new method for the removal rare earth pollutants.

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A facile solvent-free and one-step route to prepare amino-phosphonic acid functionalized hollow mesoporous silica nanospheres for efficient Gd(III) removal

Cited by 27 publications

References 46 publications

Recyclable Amino-Phosphorylated Polyacrylonitrile Fiber for Gd(III) Adsorption in Aqueous Solution

Recyclable Amino-Phosphorylated Polyacrylonitrile Fiber for Gd(III) Adsorption in Aqueous Solution

Nd(III) and Gd(III) Sorption on Mesoporous Amine-Functionalized Polymer/SiO2 Composite

Green Preparation of Aminated Magnetic PMMA Microspheres via EB Irradiation and Its Highly Efficient Uptake of Ce(III)

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