Seisenbaeva Gulaim A, Daniel Geoffrey, Kessler Vadim G, Nedelec Jean-Marie
Department of Chemistry and Biotechnology, BioCenter, Swedish University of Agricultural Sciences, Box 7015, 75007 Uppsala (Sweden).
Chemistry. 2014 Aug 18;20(34):10732-6. doi: 10.1002/chem.201402691. Epub 2014 Jul 8.
Mesoporous powders of transition-metal oxides, TiO2, ZrO2, HfO2, Nb2O5, and Ta2O5, 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 TiO2, 73.0 for ZrO2, and 74.7 mg g(-1) for Nb2O5 in relation to the Cr2O7(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.
通过快速单步热水解法制备了纯有机杂质的过渡金属氧化物(TiO₂、ZrO₂、HfO₂、Nb₂O₅ 和 Ta₂O₅)介孔粉末。所得材料具有令人印象深刻的大活性表面积和尖锐的孔径分布,由具有结晶核和无定形壳的部分聚结均匀纳米颗粒组成。它们在从溶液中去除 Cr(VI) 阴离子方面显示出极高的吸附容量(相对于 Cr₂O₇²⁻ 阴离子,TiO₂ 为 25.8,ZrO₂ 为 73.0,Nb₂O₅ 为 74.7 mg g⁻¹),这使得它们在水修复应用中作为吸附剂非常有吸引力。所研究氧化物吸附容量的差异可以通过表面水合作用和表面电荷分布的变化来解释。