Liu Fujian, Kong Weiping, Wang Liang, Noshadi Iman, Zhang Zhonghua, Qi Chenze
Key Laboratory of Alternative Technologies for Fine Chemicals Process of Zhejiang Province, Department of Chemistry, Shaoxing University, Shaoxing, 312000, People's Republic of China. Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou, 310028, People's Republic of China.
Nanotechnology. 2015 Feb 27;26(8):085705. doi: 10.1088/0957-4484/26/8/085705. Epub 2015 Feb 6.
Visible light active and stable nanoporous polymeric base-crystalline TiO2 nanocomposites were solvothermally synthesized from in situ copolymerization of divinylbenzene (DVB) with 1-vinylimidazolate (VI) or 4-vinylpyridine (Py) in the presence of tetrabutyl titanate without the use of any other additives (PDVB-VI-TiO2-x, PDVB-Py-TiO2-x, where x stands for the molar ratio of TiO2 to VI or Py), which showed excellent activity with respect to catalyzing the degradation of organic pollutants of p-nitrophenol (PNP) and rhodamine-B (RhB). TEM and SEM images show that PDVB-VI-TiO2-x and PDVB-Py-TiO2-x have abundant nanopores, and TiO2 nanocrystals with a high degree of crystallinity were homogeneously embedded in the PDVB-VI-TiO2-x and PDVB-Py-TiO2-x, forming a stable 'brick-and-mortar' nanostructure. PDVB-VI and PDVB-Py supports act as the glue linking TiO2 nanocrystals to form nanopores and constraining the agglomeration of TiO2 nanocrystals. XPS spectra show evidence of unique interactions between TiO2 and basic sites in these samples. UV diffuse reflectance shows that PDVB-VI-TiO2-x and PDVB-Py-TiO2-x exhibit a unique response to visible light. Catalytic tests show that the PDVB-VI-TiO2-x and PDVB-Py-TiO2-x were active in catalyzing the degradation of PNP and RhB organic pollutants under visible light irradiation. The enhanced activities of the PDVB-VI-TiO2-x and PDVB-Py-TiO2-x were ascribed to synergistic effects between abundant nanopores and the unique optical adsorption of visible light in the samples.
通过在钛酸四丁酯存在下，使二乙烯基苯（DVB）与1-乙烯基咪唑盐（VI）或4-乙烯基吡啶（Py）原位共聚，溶剂热合成了可见光活性且稳定的纳米多孔聚合物基结晶TiO₂纳米复合材料，无需使用任何其他添加剂（PDVB-VI-TiO₂-x、PDVB-Py-TiO₂-x，其中x代表TiO₂与VI或Py的摩尔比），这些复合材料在催化对硝基苯酚（PNP）和罗丹明B（RhB）等有机污染物的降解方面表现出优异的活性。透射电子显微镜（TEM）和扫描电子显微镜（SEM）图像表明，PDVB-VI-TiO₂-x和PDVB-Py-TiO₂-x具有丰富的纳米孔，高度结晶的TiO₂纳米晶体均匀地嵌入在PDVB-VI-TiO₂-x和PDVB-Py-TiO₂-x中，形成稳定的“砖-灰浆”纳米结构。PDVB-VI和PDVB-Py载体充当连接TiO₂纳米晶体以形成纳米孔并抑制TiO₂纳米晶体团聚的胶水。X射线光电子能谱（XPS）光谱显示了这些样品中TiO₂与碱性位点之间独特相互作用的证据。紫外漫反射表明，PDVB-VI-TiO₂-x和PDVB-Py-TiO₂-x对可见光表现出独特的响应。催化测试表明，PDVB-VI-TiO₂-x和PDVB-Py-TiO₂-x在可见光照射下催化PNP和RhB有机污染物的降解具有活性。PDVB-VI-TiO₂-x和PDVB-Py-TiO₂-x活性的增强归因于丰富的纳米孔与样品中可见光独特的光学吸附之间的协同效应。
