The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance.
The Effect of Interfacial Chemical Bonding in TiO2-SiO2 Composites on Their Photocatalytic NOx Abatement Performance.
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DOI：
10.3791/56070
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发表时间：
2017-07-04
期刊：
影响因子：
--
通讯作者：
Macphee DE
中科院分区：
文献类型：
--
作者：
Hakki A;Yang L;Wang F;Macphee DE
颗粒光催化剂与载体材料表面的化学键合在设计更有效和实用的光催化结构中具有重要意义。然而，这种化学键合对光催化剂的光学和表面性质的影响，从而其光催化活性/反应选择性行为尚未得到系统的研究。在这项研究中，二氧化钛已被负载在二氧化硅表面上的两种不同的方法：（i）通过在原位形成的二氧化钛在石英砂的存在下，通过溶胶-凝胶法采用四丁基正钛（TBOT）;和（ii）通过结合商业二氧化钛粉末的石英与正硅酸乙酯（TEOS）的反应形成的表面硅胶层。为了比较，TiO 2纳米粒子也沉积在通过水解控制的溶胶-凝胶技术以及通过溶胶-凝胶路线从TiO 2和SiO 2前体制备的更具反应性的SiO 2的表面上。通过红外光谱证实了TiO 2和SiO2通过界面Ti-O-Si键结合，并根据ISO标准方法（ISO 22197 - 1）测试了所得复合材料光催化降解NO的光催化活性。所得材料的电子显微镜图像表明，可变的光催化剂覆盖的支持表面可以成功地实现，但对NO去除的光催化活性被发现是由制备方法的影响和硝酸盐的选择性受到不利影响的Ti-O-Si键合。
The chemical bonding of particulate photocatalysts to supporting material surfaces is of great importance in engineering more efficient and practical photocatalytic structures. However, the influence of such chemical bonding on the optical and surface properties of the photocatalyst and thus its photocatalytic activity/reaction selectivity behavior has not been systematically studied. In this investigation, TiO2 has been supported on the surface of SiO2 by means of two different methods: (i) by the in situ formation of TiO2 in the presence of sand quartz via a sol-gel method employing tetrabutyl orthotitanium (TBOT); and (ii) by binding the commercial TiO2 powder to quartz on a surface silica gel layer formed from the reaction of quartz with tetraethylorthosilicate (TEOS). For comparison, TiO2 nanoparticles were also deposited on the surfaces of a more reactive SiO2 prepared by a hydrolysis-controlled sol-gel technique as well as through a sol-gel route from TiO2 and SiO2 precursors. The combination of TiO2 and SiO2, through interfacial Ti-O-Si bonds, was confirmed by FTIR spectroscopy and the photocatalytic activities of the obtained composites were tested for photocatalytic degradation of NO according to the ISO standard method (ISO 22197−1). The electron microscope images of the obtained materials showed that variable photocatalyst coverage of the support surface can successfully be achieved but the photocatalytic activity towards NO removal was found to be affected by the preparation method and the nitrate selectivity is adversely affected by Ti-O-Si bonding.
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影响因子：
3.9
作者：
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通讯作者：
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3.9
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通讯作者：
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作者：
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