Microemulsion-assisted synthesis of hierarchical porous Ni(OH)2/SiO2 composites toward efficient removal of formaldehyde in air.
Microemulsion-assisted synthesis of hierarchical porous Ni(OH)2/SiO2 composites toward efficient removal of formaldehyde in air.
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DOI：
10.1039/c3dt51067k
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发表时间：
2013-06
影响因子：
4
通讯作者：
Zhihua Xu;Jiaguo Yu;Gang Liu;B. Cheng;Peng Zhou;Xinyang Li
中科院分区：
文献类型：
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作者：
Zhihua Xu;Jiaguo Yu;Gang Liu;B. Cheng;Peng Zhou;Xinyang Li
采用油包水微乳液制备了具有分层片状纳米结构的Ni(OH)2/SiO2复合材料，并通过x射线衍射、热重、傅里叶变换红外光谱、扫描电镜、透射电镜、氮吸附和x射线光电子能谱等手段对其进行了表征。制备的层次化多孔Ni(OH)2/SiO2复合材料在常温下对空气中的甲醛（HCHO）具有优异的去除性能。发现时效时间对孔隙结构、比表面积和HCHO吸附有显著影响。在正硅酸四乙酯（TEOS）存在下时效4 h后，Ni(OH)2/SiO2复合材料比Ni(OH)2表现出较高的HCHO吸附能力和较好的可回收性，这主要归功于相对较大的BET表面积、最佳孔径、Ni(OH)2与SiO2的合适比例以及Ni(OH)2与SiO2之间的协同效应。本研究结果不仅证明了层次化多孔Ni(OH)2/SiO2复合材料可以作为空气中HCHO的高效吸附剂，而且为合理设计高性价比、高性能、环保的室内空气净化吸附剂提供了一条新途径。
Ni(OH)2/SiO2 composites with hierarchical flake-like nanostructures were synthesized using water-in-oil microemulsion and characterized by X-ray diffraction, thermogravimetry, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption, and X-ray photoelectron spectroscopy. The as-prepared hierarchical porous Ni(OH)2/SiO2 composites show an excellent performance for formaldehyde (HCHO) removal in air at an ambient temperature. It was found that the aging time had a significant impact on the pore structure, surface area and HCHO adsorption. The Ni(OH)2/SiO2 composite aged for 4 h in the presence of tetraethyl orthosilicate (TEOS) exhibited a relatively high HCHO adsorption capacity as well as good recyclability compared with Ni(OH)2, attributed to a relatively large BET surface area, an optimal pore size, a suitable proportion between Ni(OH)2 and SiO2, and a synergistic effect between Ni(OH)2 and SiO2. The results from this work not only demonstrate that hierarchical porous Ni(OH)2/SiO2 composites can act as an efficient adsorbent toward HCHO in air, but suggest a new route for the rational design of cost-effective, high-performance and environmentally benign adsorbents for indoor air cleanup.