Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 34, 2015
Previous Article Next Article

Selective and irreversible adsorption of mercury(ii) from aqueous solution by a flower-like titanate nanomaterial

Author affiliations

Abstract

A novel flower-like titanate nanomaterial (titanate nanoflowers, TNFs) was synthesized through a hydrothermal method using nano-anatase and sodium hydroxide, and used for mercury(II) removal from aqueous solution. The large surface area (187.32 m2 g−1) and low point of zero charge (3.04) of TNFs facilitated the adsorption of cations. Adsorption experiments indicated that TNFs could quickly capture 98.2% of Hg(II) from solution within 60 min at pH 5. The maximum adsorption capacity of Hg(II) was as large as 454.55 mg g−1 calculated by the Langmuir isotherm model. Moreover, selective adsorption of Hg(II) by TNFs was observed with the coexistence of other conventional cations (i.e., Na+, K+, Mg2+ and Ca2+) even at 10 times concentration of Hg(II). XRD analysis indicated that the prepared TNFs were a kind of tri-titanate composed of an edge-sharing triple [TiO6] octahedron and interlayered Na+/H+, and ion-exchange between Hg2+ and Na+ was the primary adsorption mechanism. Furthermore, it was interesting that the basic crystal structure of TNFs, tri-titanate (Ti3O72−), transformed into hexa-titanate (Ti6O132−) after adsorption, resulting in the trapping of Hg(II) into the lattice tunnel of this hexa-titanate. Desorption experiments also confirmed the irreversible adsorption due to Hg(II) trapped in TNFs, which achieved safe disposal of this highly toxic metal in practical application.

Graphical abstract: Selective and irreversible adsorption of mercury(ii) from aqueous solution by a flower-like titanate nanomaterial

Back to tab navigation

Supplementary files

Article information


Submitted
19 Jun 2015
Accepted
24 Jul 2015
First published
24 Jul 2015

J. Mater. Chem. A, 2015,3, 17676-17684
Article type
Paper
Author version available

Selective and irreversible adsorption of mercury(II) from aqueous solution by a flower-like titanate nanomaterial

W. Liu, X. Zhao, T. Wang, J. Fu and J. Ni, J. Mater. Chem. A, 2015, 3, 17676
DOI: 10.1039/C5TA04521E

Social activity

Search articles by author

Spotlight

Advertisements