A novel multi-shelled Fe3O4@MnOx hollow microspheres for immobilizing U(VI) and Eu(III)

Song, Shuang; Zhang, Sai; Huang, Shuyi; Zhang, Rui; Liu, Yin; Hu, Yang; Wen, Tao; Li, Zhuang; Hu, Baowei; Wang, Xiangke

doi:10.1016/j.cej.2018.08.205

Cited by 118 publications

(31 citation statements)

References 74 publications

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“…243,244 Recently, Song et al reported multishelled Fe 3 O 4 @MnO x hollow spheres, which were synthesized via a three-stepped process, namely, the in situ coating of Fe 3 O 4 @C on the surface SiO 2 cores, self-template formation of MnO x by reacting between Fe 3 O 4 @C and KMnO 4 , and SiO 2 removal via etching with NaOH. 245 When used as an adsorbent for the removal of uranium (U(VI)) and europium (Eu(III)), the isotherms of these two radionuclides onto the adsorbents effectively matched with the Langmuir model. The as-obtained multishelled Fe 3 O 4 @MnO x hollow spheres offered high adsorption capacities (maximum absorption capacities of 106.72 mg g À1 for U(VI) and 138.13 mg g À1 for Eu(III) could be obtained at 298 K), revealing the advantages of high-performance adsorbents.…”

Section: Template-free Methodsmentioning

confidence: 94%

Recent progress in the syntheses and applications of multishelled hollow nanostructures

Zhu

Tang

Wei

et al. 2020

Mater. Chem. Front.

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Section: Template-free Methodsmentioning

confidence: 94%

Recent progress in the syntheses and applications of multishelled hollow nanostructures

Zhu

Tang

Wei

et al. 2020

Mater. Chem. Front.

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“…When pH > 6.0, as the alkalinity of the solution increases, the hydroxide ion concentration in the solution continuously increases, and hydroxide ions and uranyl ions can form some ions with lower adsorption affinity, including [UO 2 OH] + , [(UO 2 ) 3 (OH) 5 ] + , [(UO 2 ) 2 (OH) 2 (OH) 2 ] 2+ , [(UO 2 ) 3 (OH) 4 ] 2+ , [(UO 2 ) 2 OH] 3+ , [(UO 2 ) 3 (OH)] 5+ , [(UO 2 ) 3 (OH) 7 ] − and [UO 2 (OH) 4 ] 2− . The adsorption of uranyl ions decreases [7,28,29].…”

Section: Resultsmentioning

confidence: 99%

“…6.0, as the alkalinity of the solution increases, the hydroxide ion concentration in the solution continuously increases, and hydroxide ions and uranyl ions can form some ions with lower adsorption affinity, including 22 . The adsorption of uranyl ions decreases [7,28,29].…”

Section: Effect Of Phmentioning

confidence: 99%

Preparation of modified pomelo peel's pulp adsorbent and its adsorption to uranyl ions

Yang

Tuo

et al. 2019

R. Soc. open sci.

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Using pomelo peel's pulp (PPP) as raw material, a new chemically modified PPP was prepared by the process of fermentation, cooking, freeze-drying, and so on. The adsorbent has been characterized by EDS, IR, BET and SEM. The factors of different adsorption conditions such as pH value, adsorption temperature, mass of adsorbent, adsorption time and initial concentration of UO 2 2+ were investigated. The adsorption mechanism was explored by adsorption thermodynamics and kinetics experiments. The results indicate that the pH value is 6.0, the dosage of adsorbent is 500 mg l –1 , the temperature is 50°C and the adsorption time is 90 min, which is the best adsorption condition. When the initial concentration of UO 2 2+ is 35 mg l –1 , the adsorbed amount of uranyl ions by the modified PPP adsorbent can reach 42.733 mg g −1 , 26.8% higher than the adsorption amount of unmodified adsorbent (31.276 mg g −1 ), which is obviously enhanced. The kinetic and thermodynamic experiments show that the adsorption process is in good agreement with the pseudo second-order kinetics model, that it is an endothermic reaction, and the reaction is spontaneous. The adsorption process is entropy-dominated. The Freundlich adsorption isotherm can describe the adsorption process more accurately.

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“…In the FT-IR spectrum of Fig. 5(a), the characteristic stretching vibration of [O=U(VI)=O] 2+ at 919 cm -1 to 968 cm -1 was overlapped by the stretching vibration of C-O or N-O [43] . In addition, the characteristic peaks of other groups obviously displacements among the amidoxime, carboxylic and hydroxylic or amidogen groups (766 cm -1 to 1056 cm -1 ,1506 cm -1 to 1788 cm -1 ,3390 cm -1 to 3448 cm -1 ), which could be amidoxime and carboxylic groups banding with uranyl ion on the surface of AO-HTC, and reduced the band intensity of functional groups [44] .…”

Section: Post-sorption Characterizationmentioning

confidence: 99%

Adsorption of U(VI) onto Amidoxime-functionalized Hydrothermal Carbon in the Presence of Ca-U(VI)-CO3 Complexes

Dong¹,

Zhang²,

Zhou³

et al. 2020

Res. Appl. Mater. Sci.

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The aim is collecting uranium from groundwater in which uranium mainly exists in negative species, the amidoxime-functionalized hydrothermal carbon (AO-HTC) was synthesized. From the results of N2 adsorption-desorption and SEM, AO-HTC is a small spherical surface; FT-IR and Elemental analysis showed that the amidoxime group was successfully grafted onto the surface of the material; Zeta-potential measurement showed that the amino nitrogen atom is protonated in the oxime group. The optimum pH value of AO-HTC for uranium adsorption is 6.0, and the adsorption equilibrium is reached within 80 min, which is in accordance with the pseudo-second order adsorption kinetic model. The adsorption of uranium by AO-HTC accords with the Langmuir isotherm adsorption model, and the single-layer saturated adsorption capacity is 254.13mg·g-1. The thermodynamic parameters calculated by the adsorption isotherm indicate that AO-HTC adsorption of uranium is a spontaneous endothermic chemical process and Carbonate ion, calcium ion and humic acid concentration have great influence on uranium adsorption. The experiments results show that AO-HTC has the potential to elimination of U(VI) from groundwater.

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A novel multi-shelled Fe3O4@MnOx hollow microspheres for immobilizing U(VI) and Eu(III)

Cited by 118 publications

References 74 publications

Recent progress in the syntheses and applications of multishelled hollow nanostructures

Recent progress in the syntheses and applications of multishelled hollow nanostructures

Preparation of modified pomelo peel's pulp adsorbent and its adsorption to uranyl ions

Adsorption of U(VI) onto Amidoxime-functionalized Hydrothermal Carbon in the Presence of Ca-U(VI)-CO3 Complexes

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