Calixarene-functionalized graphene oxide composites for adsorption of neodymium ions from the aqueous phase

Zhang, Peng; Wang, Yaling; Zhang, Dongxiang; Bai, Han; Tarasov, V. V.

doi:10.1039/c5ra27509a

Cited by 35 publications

(11 citation statements)

References 45 publications

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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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Section: Resultsmentioning

confidence: 99%

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

et al. 2021

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“…Based on the experimental data obtained, the value of activation energy for V-DEHPA-Fe was found to be 10.74 kJ mol −1 with a coefficient of determination of R 2 = 0.9967. Similarly, for VF-DEHPA-Fe activation energy of 30.53 kJ mol −1 and coefficient of determination of R 2 = 0.8424 suggest that the adsorption process of As(V) on the materials evaluated is a chemical adsorption, because the activation energy has value higher than 8 kJ mol −1 [93,94]. Thermodynamic studies were conducted in the temperature range 298 to 318 K. These studies provide information about the energy changes associated with the adsorption process, confirming if the process is spontaneous or not.…”

Section: Effect Of Contact Time and Temperature And Adsorption Kinetics/thermodynamicsmentioning

confidence: 86%

Testing of Chemically Activated Cellulose Fibers as Adsorbents for Treatment of Arsenic Contaminated Water

et al. 2021

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Exposure to different arsenic concentrations (higher than 10 μg/L), either due to the direct consumption of contaminated drinking water or indirectly by using contaminated food is harmful for human health. Therefore, it is important to remove arsenic from aqueous solutions. Among many arsenic removal technologies, adsorption offers a promising solution with a good efficiency, however the material used as adsorbent play a very vital role. The present investigation evaluated the behavior of two cellulose-based adsorbent materials, i.e., viscose fibers (V) and its TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) derivative, obtained by using the well-established TEMPO-mediated protocol (VF). Due to the known arsenic affinity for Fe ions the two materials were later doped with it. This was done after a preliminary functionalization with di-2-ethylhexyl phosphoric acid (DEHPA), to obtain two materials: V-DEHPA-Fe and VF-DEHPA-Fe. Arsenic adsorption is known to be pH dependent (between 6 and 8); therefore, the optimal pH range for As(V) adsorption has been established. In order to evaluate the adsorption mechanism for both the synthesized materials, the influence of contact time, temperature and initial concentration was evaluated. Langmuir, Freundlich and Sips equilibrium isotherm models were used in order to determine the ability of the model to describe As(V) adsorption process. The maximum adsorption capacity of the material V-DEHPA-Fe was 247.5 µg As(V)/g with an As(V) initial concentration of 5 mg/L and for the material VF-DEHPA-Fe it was 171.2 µg As(V)/g with initial concentration of 5 mg/L.

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“…For the studied adsorption processes, the activation energy has a value of 21.8 kJ/mol for the adsorption of Ag (I) on Ch, with a correlation coefficient of 0.9904, and 28.4 kJ/mol for the adsorption of Ag (I) on the Ch-DDTPPBr with a correlation coefficient of 0.9925. Based on the value of the activation energy it can be concluded that the adsorption Ag (I) on the studied materials is a physical adsorption because the value of the activation energy is bigger than 8 kJ/mol [41,42].…”

Section: Activation Energymentioning

confidence: 98%

Modified Chitosan for Silver Recovery—Kinetics, Thermodynamic, and Equilibrium Studies

et al. 2020

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The aim of this study is to investigate the silver recovery from aqueous solutions. There are a variety of recovery methods, such as hydrometallurgical, bio-metallurgical, cementation, reduction, electrocoagulation, electrodialysis, ion exchange, etc. Adsorption represents a convenient, environment friendly procedure, that can be used to recover silver from aqueous solutions. In this paper we highlight the silver adsorption mechanism on chitosan chemically modified with active groups, through kinetic, thermodynamic, and equilibrium studies. A maximum adsorption capacity of 103.6 mg Ag(I)/g of adsorbent for an initial concentration of 700 mg/L was noticed by using modified chitosan. Lower adsorption capacity has been noticed in unmodified chitosan—a maximum of 75.43 mg Ag(I)/g. Optimum contact time was 120 min and the process had a maximum efficiency when conducted at pH higher than 6. At the same time, a way is presented to obtain metallic silver from the adsorbent materials used for the recovery of the silver from aqueous solutions.

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Calixarene-functionalized graphene oxide composites for adsorption of neodymium ions from the aqueous phase

Abstract: Calixarene-functionalized graphene oxide (GO) composites were synthesized via esterification and polymerization of calix[n]arenes (n = 4, 6, 8) onto graphene oxide surfaces for the first time.

Cited by 35 publications

References 45 publications

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

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

Testing of Chemically Activated Cellulose Fibers as Adsorbents for Treatment of Arsenic Contaminated Water

Modified Chitosan for Silver Recovery—Kinetics, Thermodynamic, and Equilibrium Studies

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