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采用一步溶胶-凝胶共缩合结合溶剂热合成技术制备出一系列介孔电气石/TiO2复合材料,表征了复合材料的相结构、形貌、孔隙率、光吸收性质以及组成结构。结果表明:制备的电气石/TiO2复合材料具有纯锐钛矿晶相、均匀的介孔结构、较大的比表面积(205~242m2·g-1)、均匀的孔径分布(3.4~3.8nm)以及较低的带隙能(3.0eV)。在模拟太阳光照射下,电气石/TiO2复合材料可以被成功地应用于水中有机污染物罗丹明B和诺氟沙星的降解。降解动力学研究表明:电气石的掺杂提高了TiO2的光催化量子效率,降低了TiO2的带隙能。对罗丹明B的降解,电气石掺杂量为1wt%~5wt%的电气石/TiO2复合材料表现出比纯TiO2更高的降解速率,对诺氟沙星的降解,电气石/TiO2复合材料的降解速率高于纯TiO2的。
A series of mesoporous tourmaline / TiO2 composites were prepared by one-step sol-gel co-condensation and solvothermal synthesis. The phase structure, morphology, porosity, optical absorption properties and composition of the composites were characterized. The results show that the prepared tourmaline / TiO2 composites have pure anatase phase, uniform mesoporous structure, large specific surface area (205 ~ 242m2 · g-1), uniform pore size distribution (3.4 ~ 3.8nm) And lower bandgap energy (3.0eV). The tourmaline / TiO2 composites can be successfully applied to the degradation of waterborne organic pollutants rhodamine B and norfloxacin under the simulated sunlight. Degradation kinetics shows that the doping of tourmaline increases the photocatalytic quantum efficiency of TiO2 and decreases the band gap energy of TiO2. The degradation of rhodamine B, the tourmaline / TiO2 composite with 1% ~ 5% by weight of tourmaline doping showed a higher degradation rate than pure TiO2, the degradation of norfloxacin, tourmaline / TiO2 composite The degradation rate is higher than pure TiO2.