Synthesis and Characterization of 纬-Fe2O3/Carbon Hybrids and Their Application in Removal of Hexavalent Chromium Ions from Aqueous Solutions
详细信息 查看全文
- 作者：Maria Baikousi ; Athanassios B. Bourlinos ; Alexios Douvalis ; Thomas Bakas ; Dimitrios F. Anagnostopoulos ; Ji艡i Tu膷ek ; Kl谩ra 艩af谩艡ov谩 ; Radek Zboril ; Michael A. Karakassides
- 刊名：Langmuir
- 出版年：2012
- 出版时间：February 28, 2012
- 年：2012
- 卷：28
- 期：8
- 页码：3918-3930
- 全文大小：711K
- 年卷期：v.28,no.8(February 28, 2012)
- ISSN：1520-5827
文摘
Magnetic Fe2O3/carbon hybrids were prepared in a two-step process. First, acetic acid vapor interacted with iron cations dispersed on the surface of a nanocasted ordered mesoporous carbon (CMK-3). In the second step, the primarily created iron acetate species underwent pyrolysis and transformed to magnetic iron oxide nanoparticles. X-ray diffraction, Fourier-transform infrared, and Raman spectroscopies were used for the chemical and structural characterization of the hybrids, while surface area measurements, thermal analysis, and transmission electron microscopy were employed to determine their physical, surface, and textural properties. These results revealed the preservation of the host carbon structure, which was homogenously and controllably loaded (up to 27 wt %) with nanosized (ca. 20 nm) iron oxides inside the mesoporous system. M枚ssbauer spectroscopy and magnetic measurements at low temperatures confirmed the formation of 纬-Fe2O3 nanoparticles exhibiting superparamagnetic behavior. The kinetic studies showed a rapid removal of Cr(VI) ions from the aqueous solutions in the presence of these magnetic mesoporous hybrids and a considerably increased adsorption capacity per unit mass of sorbent in comparison to that of pristine CMK-3 carbon. The results also indicate highly pH-dependent sorption efficiency of the hybrids, whereas their kinetics was described by a pseudo-second-order kinetic model. Taking into account the simplicity of the synthetic procedure and possibility of magnetic separation of hybrids with immobilized pollutant, the developed mesoporous nanomaterials have quite real potential for applications in water treatment technologies.