Preparation and photocatalytic activity of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/anatase titanium oxide nanocomposite-encapsulated low molecular weight aromatic compounds
Preparation and photocatalytic activity of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/anatase titanium oxide nanocomposite-encapsulated low molecular weight aromatic compounds
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氟烷基封端乙烯基三甲氧基硅烷低聚物/锐钛矿型二氧化钛纳米复合材料包覆低分子量芳香族化合物的制备及其光催化活性
DOI：
10.1007/s00396-013-3027-5
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发表时间：
2013
影响因子：
2.4
通讯作者：
H. Sawada
中科院分区：
文献类型：
--
作者：
Sujuan Guo;T. Ogasawara;Tomoya Saito;Hiroshi Kakehi;Y. Kato;M. Miura;N. Isu;H. Sawada
采用溶胶-凝胶法制备了氟烷基封端的乙烯基三甲氧基硅烷齐聚物/纳米TiO 2复合材料[RF-（VM-SiO2）n-RF/an-TiO 2/Ar-H]，并以双酚A [BPA]、1，1 ′-联二苯甲酰胺（BPA）、1，1 ′-联二苯甲酰胺（BIPA）、1，1 ′-联三苯甲酰胺（B（2-萘酚）[BINOL]和富勒烯。热重分析测量表明，RF-（VM-SiO2）n-RF/an-TiO 2纳米复合物封装的BPA和BINOL，其中复合物中的理论含量为25 - 32%，即使在800 °C下煅烧后也没有产生与这些芳香族化合物的含量相对应的重量损失。另一方面，相应的纳米复合材料封装的富勒烯表现出的重量损失行为有关的富勒烯的存在下，在类似的条件下，然而，紫外-可见光谱显示，即使在煅烧后的复合材料中的残留富勒烯的存在。这些氟化纳米复合材料中的An-TiO 2即使在1，000 °C煅烧后也可以保持其晶体结构而不会相变为金红石，尽管母体an-TiO 2纳米颗粒在类似条件下经历了完全的相变为金红石。RF-（VM-SiO2）n-RF/an-TiO 2/Ar-H纳米复合材料在1,000 °C煅烧后仍具有良好的光催化活性。更有趣的是，这些氟化纳米复合材料煅烧前后被发现表现出更高的光催化活性在初始紫外光照射1至3分钟比相应的RF-（VM-SiO2）n-RF/an-TiO 2纳米复合材料在类似的条件下。
图在800 °C煅烧后，纳米复合材料中的BPA和BINOL包封没有表现出重量损失，并且RF-（VM-SiO2）n-RF/an-TiO 2/Ar-H纳米复合材料在1，000 °C煅烧前后可以提供比RF-（VM-SiO2）n-RF/an-TiO 2纳米复合材料更高的光催化活性。RF-（VM-SiO2）n-RF/an-TiO 2/C60纳米复合材料经煅烧后的光催化活性比RF-（VM-SiO2）n-RF/an-TiO 2纳米复合材料提高了约2.5倍。
AbstractFluoroalkyl end-capped vinyltrimethoxysilane oligomer/anatase titanium oxide nanocomposite-encapsulated low molecular weight aromatic compounds [RF-(VM-SiO2)n-RF/an-TiO2/Ar-H] were prepared by the sol–gel reactions of the corresponding oligomer in the presence of anatase titanium oxide nanoparticles (an-TiO2) and the aromatic compounds such as bisphenol A [BPA], 1,1′-bi(2-naphthol) [BINOL], and fullerene under alkaline conditions. Thermogravimetric analyses measurements show that RF-(VM-SiO2)n-RF/an-TiO2 nanocomposite-encapsulated BPA and BINOL, in which the theoretical contents in the composites are 25 ∼ 32 %, were found to give no weight loss corresponding to the contents of these aromatic compounds even after calcination at 800 °C. On the other hand, the corresponding nanocomposite-encapsulated fullerene exhibited weight loss behavior related to the presence of fullerene under similar conditions; however, UV–vis spectra showed the presence of the residual fullerene in the composites even after calcination. An-TiO2 in these fluorinated nanocomposites can keep its crystalline structure without phase transformation into rutile even after calcination at 1,000 °C, although the parent an-TiO2 nanoparticles underwent a complete phase transformation into rutile under similar conditions. Notably, RF-(VM-SiO2)n-RF/an-TiO2/Ar-H nanocomposites can give a good photocatalytic activity even after calcination at 1,000 °C for the decolorization of methylene blue under UV light irradiation. More interestingly, these fluorinated nanocomposites before and after calcination were found to exhibit a higher photocatalytic activity at the initial UV light irradiation from 1 to 3 min than that of the corresponding RF-(VM-SiO2)n-RF/an-TiO2 nanocomposites under similar conditions.
FigureEncapsulated BPA and BINOL in the nanocomposites exhibit no weight loss even after calcination at 800 °C, and RF-(VM-SiO2)n-RF/an-TiO2/Ar-H nanocomposites before and after calcination at 1,000 °C can give a higher photocatalytic activity than that of RF-(VM-SiO2)n-RF/an-TiO2 nanocomposites. Notably, the photocatalytic activity of RF-(VM-SiO2)n-RF/an-TiO2/C60 nanocomposites after calcination increased by about 2.5-fold, compared with that of RF-(VM-SiO2)n-RF/an-TiO2 nanocomposites.