Issue 3, 2017

Exceptional sorption behaviour of porous tungsten oxide for aqueous lead

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

Supplementary files

Article information

Article type
Communication
Submitted
22 Dec 2016
Accepted
28 Feb 2017
First published
03 Mar 2017

Environ. Sci.: Water Res. Technol., 2017,3, 429-432

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, 3, 429 DOI: 10.1039/C6EW00349D

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