Introduction of amino groups into polyphosphazene framework supported on CNT and coated Fe3O4 nanoparticles for enhanced selective U(VI) adsorption

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

doi:10.1016/j.apsusc.2018.10.097

Cited by 58 publications

(11 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…Помимо индивидуальных углеродных нанотрубок, большой интерес представляют нанотрубки с модифицированной поверхностью и композиты на основе нанотрубок, твердого носителя или модификатора [42]. При их формировании в качестве модификатора могут использоваться многие вещества, например, оксиды металлов и материалы, в том числе кремнеземы.…”

Section: Determination Of Uranium In Aqueous Solutions By the Time-of-flight Mass-spectrometry With A Pulsed Glow Discharge After Its Accunclassified

Determination of uranium in aqueous solutions by the time-of-flight mass-spectrometry with a pulsed glow discharge after its accumulation on the oxidized carbon nanotubes

Titova¹,

Постнов²,

Савинов³

et al. 2020

АиК

View full text Add to dashboard Cite

The pollution of the environment with uranium dictates the need to control the concentration of this element in natural waters to the permissible limits for the stability of the ecosystems and public health. In 2011, WHO set maximum permissible concentration of uranium in water to 0.03 ppm due to the strong toxicity and radioactivity of uranium in water. Therefore, the continuous monitoring of uranium content is an important task for the safety and health of the citizens. To determine the low uranium content in natural waters, the conservation of the studied solutions is necessary. However, this method of storage and transportation is not always simple. In the current paper, as a convenient method of concentrating uranium, preserving the sample and transporting it, we used the method of sorbing uranium on sorbents. Single-layer carbon nanotubes were used as sorbents. Their surfaces were modified using wet chemical oxidation and synthesis with Aerosil A-380 silica. Two schemes were considered for concentrating the uranium on the surface of the sorbent: individual carbon nanotubes and nanotubes modified with silica. The direct analysis was used to determine the content of uranium in the sorbent, namely, time-of-flight mass spectrometry with the pulsed glow discharge (GD-MS). The most effective approach for the determination of uranium in water was the sorption of uranium on the tablet consisting of oxidized nanotubes modified with silica. The limit of detection in this case was 0.2 ppb.

show abstract

“…From the perspectives of resource recycling and environmental protection, absorbing uranium from water in an economic and environmentally friendly way is of great scientific and practical significance [1][2]. Many techniques, such as adsorption [3][4], electroreduction [5], and chemical precipitation [6], have been extensively studied and applied to the treatment of radionuclides.…”

Section: Introductionmentioning

confidence: 99%

U(VI) adsorption behavior onto polypyrrole coated 3R-MoS2 nanosheets prepared with the molten salt electrolysis method

Liu

Tang

Zhang

et al. 2021

Int J Miner Metall Mater

Self Cite

View full text Add to dashboard Cite

To improve the separation capacity of uranium in aqueous solutions, 3R-MoS 2 nanosheets were prepared with molten salt electrolysis and further modified with polypyrrole (PPy) to synthesize a hybrid nanoadsorbent (PPy/3R-MoS 2 ). The preparation conditions of PPy/3R-MoS 2 were investigated and the obtained nanosheets were characterized with scanning electron microscope (SEM), high resolution transmission electron microscope (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS). The results showed that PPy/3R-MoS 2 exhibited enhanced adsorption capacity toward U(VI) compared to pure 3R-MoS 2 and PPy; the maximum adsorption was 200.4 mg/g. The adsorption mechanism was elucidated with XPS and FTIR: (1) negatively charged PPy/3R-MoS 2 nanosheets attracted by an electrostatic interaction;(2) exposed C, N, Mo, and S atoms complexed with U(VI) through coordination; (3) Mo in the complex partly reduced the adsorbed U(VI) to U(IV), which further regenerated the adsorption point and continuously adsorbed U(VI). The design of the PPy/3R-MoS 2 composite with a high adsorption capacity and chemical stability provides a new direction for the removal of radionuclide.

show abstract

Introduction of amino groups into polyphosphazene framework supported on CNT and coated Fe3O4 nanoparticles for enhanced selective U(VI) adsorption

Cited by 58 publications

References 27 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

Determination of uranium in aqueous solutions by the time-of-flight mass-spectrometry with a pulsed glow discharge after its accumulation on the oxidized carbon nanotubes

U(VI) adsorption behavior onto polypyrrole coated 3R-MoS2 nanosheets prepared with the molten salt electrolysis method

Contact Info

Product

Resources

About