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Exceptional sorption behaviour of porous tungsten oxide for aqueous lead

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Abstract

A nanoporous WO3 sorbent was found to be highly reactive towards Pb2+, exhibiting a molar sorption capacity of 42.5% and sorption half-lives as low as 47 s. The sorbent lowers the concentration of Pb2+ to less than 0.5 ppb (the instrumental detection limit), a level well below the WHO and EPA action limits. Powder X-ray diffraction and Raman spectroscopy performed on the sorbent after loading with lead demonstrated that the formation of crystalline stolzite (PbWO4) had taken place. Therefore, lead sorption occurs via a chemical reaction between Pb2+ and nanoporous WO3 accounting for the high sorption capacity. Scanning electron microscopy showed that the sorption reaction led to a large morphology change from non-descript smaller tabular particles of the sorbents to large clusters of octahedral crystallites of the stolzite product.

Graphical abstract: Exceptional sorption behaviour of porous tungsten oxide for aqueous lead

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Publication details

The article was received on 22 Dec 2016, accepted on 28 Feb 2017 and first published on 03 Mar 2017


Article type: Communication
DOI: 10.1039/C6EW00349D
Citation: Environ. Sci.: Water Res. Technol., 2017, Advance Article
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    Exceptional sorption behaviour of porous tungsten oxide for aqueous lead

    C. K. Perkins, T. M. Reed, Z. A. Brown and A. W. Apblett, Environ. Sci.: Water Res. Technol., 2017, Advance Article , DOI: 10.1039/C6EW00349D

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