Fast and High Amount of U(VI) Uptake by Functional Magnetic Carbon Nanotubes with Phosphate Group

Liu, Yan; Zhao, Zhengping; Yuan, Dingzhong; Wang, Yun; Dai, Ying; Chew, Jia Wei

doi:10.1021/acs.iecr.8b03864

Cited by 27 publications

(3 citation statements)

References 39 publications

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“…The results reveal that the isotherm fits better to the Langmuir model ( R 2 = 0.994) than to the Freundlich model ( R 2 = 0.941) . Moreover, the maximum uranium adsorption amount of HCPP (800 mg g –1 ) calculated by the Langmuir adsorption equation is much closer to the corresponding experimental data (750 mg g –1 ). − It can be clearly concluded that the adsorption of uranium on HCPP follows the Langmuir adsorption model . The comparison of uranium adsorption capacity obtained in this work with those of other adsorbents is represented in Table .…”

Section: Resultssupporting

confidence: 59%

Ultra-High Performance of Hyper-Crosslinked Phosphate-Based Polymer for Uranium and Rare Earth Element Adsorption in Aqueous Solution

Tan

et al. 2019

Langmuir

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In this work, a new type of hyper-crosslinked phosphate-based polymer (HCPP) polymerized by bis(2-methacryloxyethyl)phosphate has been developed for uranium and rare earth element (REE) extraction in an aqueous solution. The influence of the pH value, contact time, initial concentration, temperature, and competing ions on uranium adsorption of HCPP is investigated in detail. HCPP exhibits a maximum uranium adsorption capacity of up to 800 mg g–1 at pH = 6.0 and excellent selectivity toward uranium adsorption over coexisting ions, because of the high affinity between HCPP and uranium ions and dense phosphate groups on the backbone. It also demonstrates high adsorption performance in both simulated seawater with a high salt concentration and a real nuclear industrial effluent. Besides, the crosslinked network structure of HCPP endows this polymer with high chemical stability and reusability. Furthermore, the adsorption mechanism is probed by energy-dispersive spectroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared measurements. It is confirmed that the adsorption of uranium on the adsorbent originates from the interaction between phosphate groups and uranium ions. Meanwhile, HCPP also displays high REE adsorption capacities. This work indicates that the phosphate-based HCPP could be utilized as a promising adsorbent for the effective removal of uranium and REEs from aqueous solution.

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Section: Resultssupporting

confidence: 59%

Ultra-High Performance of Hyper-Crosslinked Phosphate-Based Polymer for Uranium and Rare Earth Element Adsorption in Aqueous Solution

Tan

et al. 2019

Langmuir

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“…The saturated U(VI) adsorption capacities of pure carbon nanotubes (CNTs) and graphene oxide are around 41.48 and 97.5 mg·g –1 , respectively. , Therefore, many improved methods were already proposed to optimize the solution to the problems mentioned above. For example, Liu et al prepared a magnetic phosphoryl functional polyphosphazene base built with a CNT composite (PZS-TPP/CNT/Fe 3 O 4 ), which had an optimal adsorption of 300 mg·g –1 for U(VI) removal. Zhu et al grafted fungus hypha onto a layer of two-dimensional graphene oxide sheets and pyrolyzed to form a fungal hyphae/graphene oxide aerogel for efficient removal of U(VI) with an increased adsorption capacity (288.42 mg·g –1 ).…”

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Uranium(VI) from Aqueous Solutions by Triethylenetetramine-Functionalized Single-Walled Carbon Nanohorns

Wang

Huang

et al. 2020

ACS Omega

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In the present study, SWCNH–COOH and SWCNH–TETA were fabricated using single-walled carbon nanohorns (SWCNHs) via carboxylation and grafting with triethylenetetramine (TETA) for uranium (VI) ion [U(VI)] removal. The morpho-structural characterization of as-prepared adsorbing materials was performed by transmission electron microscopy, X-ray diffractometry, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Several parameters including the pH value of the aqueous solutions, contact time, temperature, and U(VI) concentration were used to evaluate the sorption efficiency of SWCNH–COOH and SWCNH–TETA. The Langmuir isotherm model could well represent the as-obtained adsorption isotherms, and the kinetics was successfully modeled by pseudo-second-order kinetics in the adsorption process. The maximum adsorption capacity of SWCNH–TETA was calculated as 333.13 mg/g considering the Langmuir isotherm model. Thermodynamic studies showed that adsorption proved to be a spontaneous endothermic process. Moreover, SWCNH–TETA exhibited excellent recycling performance and selective adsorption of uranium. Furthermore, the possible mechanism was investigated by XPS and density functional theory calculations, indicating that the excellent adsorption was attributed to the cooperation capability between uranium ions and nitrogen atoms in SWCNH–TETA. This efficient approach can provide a strategy for developing high-performance adsorbents for U(VI) removal from wastewater.

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“…29 In addition, functionalized PPZs were prepared by polymerization precipitation with p -phenylenediamine, polyethyleneimine and 4,4′-oxydianiline for uranyl recovery, respectively, showing promising adsorption performance. Their adsorption capacities for uranium ions were 168.9 mg g −1 , 30 273.5 mg g −1 , 31 and 606.1 mg g −1 , 32 respectively. These findings reveal that the substitution of the side groups of HCCP by different amino ligands affects the uranium-binding capacity of PPZs.…”

Section: Introductionmentioning

confidence: 99%

Speeding up the selective extraction of uranium through in situ formed nano-pockets

et al. 2023

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Fast and High Amount of U(VI) Uptake by Functional Magnetic Carbon Nanotubes with Phosphate Group

Cited by 27 publications

References 39 publications

Ultra-High Performance of Hyper-Crosslinked Phosphate-Based Polymer for Uranium and Rare Earth Element Adsorption in Aqueous Solution

Ultra-High Performance of Hyper-Crosslinked Phosphate-Based Polymer for Uranium and Rare Earth Element Adsorption in Aqueous Solution

Efficient Removal of Uranium(VI) from Aqueous Solutions by Triethylenetetramine-Functionalized Single-Walled Carbon Nanohorns

Speeding up the selective extraction of uranium through in situ formed nano-pockets

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