Unique lead adsorption behavior of activated hydroxyl group in two-dimensional titanium carbide.
J Am Chem Soc
; 136(11): 4113-6, 2014 Mar 19.
Article
em En
| MEDLINE
| ID: mdl-24588686
ABSTRACT
The functional groups and site interactions on the surfaces of two-dimensional (2D) layered titanium carbide can be tailored to attain some extraordinary physical properties. Herein a 2D alk-MXene (Ti3C2(OH/ONa)(x)F(2-x)) material, prepared by chemical exfoliation followed by alkalization intercalation, exhibits preferential Pb(II) sorption behavior when competing cations (Ca(II)/Mg(II)) coexisted at high levels. Kinetic tests show that the sorption equilibrium is achieved in as short a time as 120 s. Attractively, the alk-MXene presents efficient Pb(II) uptake performance with the applied sorption capacities of 4500 kg water per alk-MXene, and the effluent Pb(II) contents are below the drinking water standard recommended by the World Health Organization (10 µg/L). Experimental and computational studies suggest that the sorption behavior is related to the hydroxyl groups in activated Ti sites, where Pb(II) ion exchange is facilitated by the formation of a hexagonal potential trap.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Titânio
/
Hidróxidos
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article