Rationally designed core-shell and yolk-shell magnetic titanate nanosheets for efficient U(VI) adsorption performance

Ling Yin; Shuang Song; Xiangxue Wang; Fenglei Niu; Ran Ma; Shujun Yu; Tao Wen; Yuantao Chen; Tasawar Hayat; Ahmed Alsaedi; Xiangke Wang

doi:10.1016/j.envpol.2018.03.092

Rationally designed core-shell and yolk-shell magnetic titanate nanosheets for efficient U(VI) adsorption performance

Ling Yin
, Shuang Song
, Xiangxue Wang
, Fenglei Niu
, Ran Ma
, Shujun Yu
, Tao Wen
, Yuantao Chen
, Tasawar Hayat
, Ahmed Alsaedi
, Xiangke Wang

North China Electric Power University
Qinghai Normal University
Faculty of Sciences, King Abdulaziz University
Soochow University

Research output: Contribution to journal › Article › peer-review

88 Scopus citations

Abstract

The hierarchical core-shell and yolk-shell magnetic titanate nanosheets (Fe₃O₄@TNS) were successfully synthesized by employing magnetic nanoparticles (NPs) as interior core and intercrossed titanate nanostructures (NSs) as exterior shell. The as-prepared magnetic Fe₃O₄@TNS nanosheets had high specific areas (114.9 m² g⁻¹ for core-shell Fe₃O₄@TNS and 130.1 m² g⁻¹ for yolk-shell Fe₃O₄@TNS). Taking advantage of the unique multilayer structure, the nanosheets were suitable for eliminating U(VI) from polluted water environment. The sorption was strongly affected by pH values and weakly influenced by ionic strength, suggesting that the sorption of U(VI) on Fe₃O₄@TNS was mainly dominated by ion exchange and outer-sphere surface complexion. The maximum sorption capacities (Q_max) calculated from the Langmuir model were 68.59, 121.36 and 264.55 mg g⁻¹ for core-shell Fe₃O₄@TNS and 82.85, 173.01 and 283.29 mg g⁻¹ for yolk-shell Fe₃O₄@TNS, at 298 K, 313 K and 328 K, respectively. Thermodynamic parameters (ΔH⁰, ΔS⁰ and ΔG⁰) demonstrated that the sorption process was endothermic and spontaneous. Based on X-ray photoelectron spectroscopy (XPS) analyses, the sorption mechanism was confirmed to be cation-exchange between interlayered Na⁺ and UO₂ ²⁺. The yolk-shell Fe₃O₄@TNS had more extraordinary sorption efficiency than core-shell Fe₃O₄@TNS since the yolk-shell structure provided internal void space inside the titanate shell to accommodate more exchangeable active sites. The flexible recollection and high efficient sorption capacity made core-shell and yolk-shell Fe₃O₄@TNS nanosheets promising materials to eliminate U(VI) or other actinides in wastewater cleanup applications. The well-designed magnetic Fe₃O₄@TNS nanosheets with different structures showed high sorption of U(VI), indicating that the Fe₃O₄@TNS were promising materials in the efficient elimination of U(VI) and other lanthanides/actinides in wastewater pollution applications.

Original language	English
Pages (from-to)	725-738
Number of pages	14
Journal	Environmental Pollution
Volume	238
DOIs	https://doi.org/10.1016/j.envpol.2018.03.092
State	Published - Jul 2018
Externally published	Yes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 6 Clean Water and Sanitation

Keywords

Hierarchical structure
Ion exchange
Magnetic separation
Sorption
Titanate nanosheets (TNS)
U(VI)

Access to Document

10.1016/j.envpol.2018.03.092

Cite this

@article{d98996e84bc04448b084ddb50969abbe,

title = "Rationally designed core-shell and yolk-shell magnetic titanate nanosheets for efficient U(VI) adsorption performance",

abstract = "The hierarchical core-shell and yolk-shell magnetic titanate nanosheets (Fe3O4@TNS) were successfully synthesized by employing magnetic nanoparticles (NPs) as interior core and intercrossed titanate nanostructures (NSs) as exterior shell. The as-prepared magnetic Fe3O4@TNS nanosheets had high specific areas (114.9 m2 g−1 for core-shell Fe3O4@TNS and 130.1 m2 g−1 for yolk-shell Fe3O4@TNS). Taking advantage of the unique multilayer structure, the nanosheets were suitable for eliminating U(VI) from polluted water environment. The sorption was strongly affected by pH values and weakly influenced by ionic strength, suggesting that the sorption of U(VI) on Fe3O4@TNS was mainly dominated by ion exchange and outer-sphere surface complexion. The maximum sorption capacities (Qmax) calculated from the Langmuir model were 68.59, 121.36 and 264.55 mg g−1 for core-shell Fe3O4@TNS and 82.85, 173.01 and 283.29 mg g−1 for yolk-shell Fe3O4@TNS, at 298 K, 313 K and 328 K, respectively. Thermodynamic parameters (ΔH0, ΔS0 and ΔG0) demonstrated that the sorption process was endothermic and spontaneous. Based on X-ray photoelectron spectroscopy (XPS) analyses, the sorption mechanism was confirmed to be cation-exchange between interlayered Na+ and UO2 2+. The yolk-shell Fe3O4@TNS had more extraordinary sorption efficiency than core-shell Fe3O4@TNS since the yolk-shell structure provided internal void space inside the titanate shell to accommodate more exchangeable active sites. The flexible recollection and high efficient sorption capacity made core-shell and yolk-shell Fe3O4@TNS nanosheets promising materials to eliminate U(VI) or other actinides in wastewater cleanup applications. The well-designed magnetic Fe3O4@TNS nanosheets with different structures showed high sorption of U(VI), indicating that the Fe3O4@TNS were promising materials in the efficient elimination of U(VI) and other lanthanides/actinides in wastewater pollution applications.",

keywords = "Hierarchical structure, Ion exchange, Magnetic separation, Sorption, Titanate nanosheets (TNS), U(VI)",

author = "Ling Yin and Shuang Song and Xiangxue Wang and Fenglei Niu and Ran Ma and Shujun Yu and Tao Wen and Yuantao Chen and Tasawar Hayat and Ahmed Alsaedi and Xiangke Wang",

note = "Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = jul,

doi = "10.1016/j.envpol.2018.03.092",

language = "English",

volume = "238",

pages = "725--738",

journal = "Environmental Pollution",

issn = "0269-7491",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Rationally designed core-shell and yolk-shell magnetic titanate nanosheets for efficient U(VI) adsorption performance

AU - Yin, Ling

AU - Song, Shuang

AU - Wang, Xiangxue

AU - Niu, Fenglei

AU - Ma, Ran

AU - Yu, Shujun

AU - Wen, Tao

AU - Chen, Yuantao

AU - Hayat, Tasawar

AU - Alsaedi, Ahmed

AU - Wang, Xiangke

PY - 2018/7

Y1 - 2018/7

N2 - The hierarchical core-shell and yolk-shell magnetic titanate nanosheets (Fe3O4@TNS) were successfully synthesized by employing magnetic nanoparticles (NPs) as interior core and intercrossed titanate nanostructures (NSs) as exterior shell. The as-prepared magnetic Fe3O4@TNS nanosheets had high specific areas (114.9 m2 g−1 for core-shell Fe3O4@TNS and 130.1 m2 g−1 for yolk-shell Fe3O4@TNS). Taking advantage of the unique multilayer structure, the nanosheets were suitable for eliminating U(VI) from polluted water environment. The sorption was strongly affected by pH values and weakly influenced by ionic strength, suggesting that the sorption of U(VI) on Fe3O4@TNS was mainly dominated by ion exchange and outer-sphere surface complexion. The maximum sorption capacities (Qmax) calculated from the Langmuir model were 68.59, 121.36 and 264.55 mg g−1 for core-shell Fe3O4@TNS and 82.85, 173.01 and 283.29 mg g−1 for yolk-shell Fe3O4@TNS, at 298 K, 313 K and 328 K, respectively. Thermodynamic parameters (ΔH0, ΔS0 and ΔG0) demonstrated that the sorption process was endothermic and spontaneous. Based on X-ray photoelectron spectroscopy (XPS) analyses, the sorption mechanism was confirmed to be cation-exchange between interlayered Na+ and UO2 2+. The yolk-shell Fe3O4@TNS had more extraordinary sorption efficiency than core-shell Fe3O4@TNS since the yolk-shell structure provided internal void space inside the titanate shell to accommodate more exchangeable active sites. The flexible recollection and high efficient sorption capacity made core-shell and yolk-shell Fe3O4@TNS nanosheets promising materials to eliminate U(VI) or other actinides in wastewater cleanup applications. The well-designed magnetic Fe3O4@TNS nanosheets with different structures showed high sorption of U(VI), indicating that the Fe3O4@TNS were promising materials in the efficient elimination of U(VI) and other lanthanides/actinides in wastewater pollution applications.

AB - The hierarchical core-shell and yolk-shell magnetic titanate nanosheets (Fe3O4@TNS) were successfully synthesized by employing magnetic nanoparticles (NPs) as interior core and intercrossed titanate nanostructures (NSs) as exterior shell. The as-prepared magnetic Fe3O4@TNS nanosheets had high specific areas (114.9 m2 g−1 for core-shell Fe3O4@TNS and 130.1 m2 g−1 for yolk-shell Fe3O4@TNS). Taking advantage of the unique multilayer structure, the nanosheets were suitable for eliminating U(VI) from polluted water environment. The sorption was strongly affected by pH values and weakly influenced by ionic strength, suggesting that the sorption of U(VI) on Fe3O4@TNS was mainly dominated by ion exchange and outer-sphere surface complexion. The maximum sorption capacities (Qmax) calculated from the Langmuir model were 68.59, 121.36 and 264.55 mg g−1 for core-shell Fe3O4@TNS and 82.85, 173.01 and 283.29 mg g−1 for yolk-shell Fe3O4@TNS, at 298 K, 313 K and 328 K, respectively. Thermodynamic parameters (ΔH0, ΔS0 and ΔG0) demonstrated that the sorption process was endothermic and spontaneous. Based on X-ray photoelectron spectroscopy (XPS) analyses, the sorption mechanism was confirmed to be cation-exchange between interlayered Na+ and UO2 2+. The yolk-shell Fe3O4@TNS had more extraordinary sorption efficiency than core-shell Fe3O4@TNS since the yolk-shell structure provided internal void space inside the titanate shell to accommodate more exchangeable active sites. The flexible recollection and high efficient sorption capacity made core-shell and yolk-shell Fe3O4@TNS nanosheets promising materials to eliminate U(VI) or other actinides in wastewater cleanup applications. The well-designed magnetic Fe3O4@TNS nanosheets with different structures showed high sorption of U(VI), indicating that the Fe3O4@TNS were promising materials in the efficient elimination of U(VI) and other lanthanides/actinides in wastewater pollution applications.

KW - Hierarchical structure

KW - Ion exchange

KW - Magnetic separation

KW - Sorption

KW - Titanate nanosheets (TNS)

KW - U(VI)

UR - https://www.scopus.com/pages/publications/85044755394

U2 - 10.1016/j.envpol.2018.03.092

DO - 10.1016/j.envpol.2018.03.092

M3 - Article

C2 - 29625297

AN - SCOPUS:85044755394

SN - 0269-7491

VL - 238

SP - 725

EP - 738

JO - Environmental Pollution

JF - Environmental Pollution

ER -

Rationally designed core-shell and yolk-shell magnetic titanate nanosheets for efficient U(VI) adsorption performance

Abstract

UN SDGs

Keywords

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