期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 19, 期 29, 页码 9592-9598出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201300438
关键词
adsorption; composite materials; formaldehyde; nanostructures; porous materials
资金
- 863 Program [2012AA062701]
- 973 Program [2013CB632402]
- NSFC [51072154, 21177100, 51272199]
- Chinese Ministry of Education [212115]
- PSFC [2012M521482]
- HBECF [Q20102903]
- Fundamental Research Funds for the Central Universities
- Self-Determined and Innovative Research Funds of the SKLWUT
Mesoporous ferrihydrite/SiO2 composites were synthesized according to a water-in-oil microemulsion method and characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, thermogravimetry, nitrogen-adsorption/desorption, and by X-ray photoelectron spectroscopy. The as-prepared porous ferrihydrite/SiO2 composites showed an excellent adsorption performance for formaldehyde (HCHO) removal from indoor air at ambient temperature. It was found that the aging time during the synthesis had a significant impact on the pore structure, surface area, and HCHO adsorption of these materials. The ferrihydrite/SiO2 composite that was aged for 3h in the presence of tetraethyl orthosilicate (TEOS) exhibited a relatively high HCHO adsorption capacity, as well as good recyclability, which was attributed to a relatively large BET surface area, optimal pore size, a suitable Si/Fe atomic ratio, and a synergistic effect between ferrihydrite and SiO2. This work not only demonstrates that porous ferrihydrite/SiO2 composites can act as an efficient adsorbent toward HCHO, but suggests a new route for the rational design of cost-effective and environmentally benign adsorbents with high performance for indoor air purification.
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