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General Facile Approach to Transition‐Metal Oxides with Highly Uniform Mesoporosity and Their Application as Adsorbents for Heavy‐Metal‐Ion Sequestration
Author(s) -
Seisenbaeva Gulaim A.,
Daniel Geoffrey,
Kessler Vadim G.,
Nedelec JeanMarie
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201402691
Subject(s) - adsorption , materials science , mesoporous material , amorphous solid , transition metal , chemical engineering , metal , specific surface area , nanoparticle , environmental remediation , ion , inorganic chemistry , nanotechnology , chemistry , catalysis , organic chemistry , metallurgy , contamination , biology , ecology , engineering
Mesoporous powders of transition‐metal oxides, TiO 2 , ZrO 2 , HfO 2 , Nb 2 O 5 , and Ta 2 O 5 , pure from organic impurities were produced by a rapid single‐step thermohydrolytic approach. The obtained materials display an impressively large active surface area and sharp pore‐size distribution, being composed of partially coalesced uniform nanoparticles with crystalline cores and amorphous shells. They reveal extremely high adsorption capacity in removal of Cr VI anions from solutions (25.8 for TiO 2 , 73.0 for ZrO 2 , and 74.7 mg g −1 for Nb 2 O 5 in relation to the Cr 2 O 7 2− anion), making them very attractive as adsorbents in water remediation applications. The difference in adsorption capacities for the studied oxides may be explained by variation in surface hydration and surface‐charge distribution.