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Unexpected ultrafast and high adsorption capacity of oxygen vacancy-rich WOx@C nanowire networks for aqueous Pb2+ and methylene blue removal

Abstract

The development of advanced adsorbent with high adsorption capacity and fast adsorption rate is one of the most important issues for water treatment. Herein, oxygen vacancy-rich WOx@C inorganic-organic hybrid nanowire networks were prepared by one-pot and high yield solvothermal method. With its unique inter crossed hierarchical structure and abundant active sites (oxygen vacancy), the WOx@C networks exhibited high adsorption capacities of ~1224.7 and 1188.3 mg/g for the removal of Pb2+ and methylene blue (MB), respectively. Moreover, the adsorption equilibriums of Pb2+ and MB onto WOx@C networks can be achieved within only ~1 min, which were among the fastest of previously reported Pb2+ and MB adsorbents. These unexpected ultrafast and high adsorption capacities are attributed not only to the unique network nanostructure, but also to the enriched oxygen vacancies onto which small carbonaceous molecules can attach with high affinities, and may serve as anchoring sites for Pb2+ ions or dyes. The removal mechanism of Pb2+ and MB on WOx@C can be attributed to ion exchange, π-π interaction, hydrogen bonding and/or electrostatic attraction. This study not only provides a new strategy to design inorganic-organic hybrid adsorbents, but also demonstrates its prospective application in adsorptive removal and/or recovery of heavy metal and organic pollutants on a large scale.

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Publication details

The article was received on 19 May 2017, accepted on 04 Jul 2017 and first published on 06 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04377E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Unexpected ultrafast and high adsorption capacity of oxygen vacancy-rich WOx@C nanowire networks for aqueous Pb2+ and methylene blue removal

    S. Zhang, H. yang, H. Huang, H. Gao, R. Cao, X. Wang, J. Li, X. Xu and X. Wang, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04377E

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