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采用溶胶–凝胶法和水热法相结合制备了直径为18.8nm,管径为4.7nm,管长数百纳米的锐钛矿型电气石/TiO2纳米管。研究了水热反应时间、煅烧温度和电气石的添加量对制备样品的相结构和形貌的影响,同时以甲基橙为目标降解物考察了电气石/TiO2纳米管的光催化性能。结果表明:水热处理后,经500℃煅烧可得到一维结构优良的锐钛矿型电气石/TiO2纳米管,并且电气石与TiO2以Ti―O―Si键结合,由于电气石具有永久电极性,与TiO2的协同作用可以有效提高纳米TiO2的光催化性能。当电气石含量为0.5%(质量分数),500℃下煅烧的样品,光照1h可达到最优降解率98.5%,比未经水热处理的纯纳米TiO2颗粒和经水热处理的纯纳米TiO2管分别提高了约44.9%和33.7%。
Anatase-type tourmaline / TiO2 nanotubes with a diameter of 18.8nm, a tube diameter of 4.7nm and a tube length of several hundred nanometers were prepared by sol-gel method and hydrothermal method. The effects of hydrothermal reaction time, calcination temperature and the amount of tourmaline added on the phase structure and morphology of the prepared samples were investigated. The photocatalytic activity of tourmaline / TiO2 nanotubes was also investigated with methyl orange as degradation target. The results show that anatase-type tourmaline / TiO2 nanotubes with one-dimensional structure can be obtained by calcination at 500 ℃ after hydrothermal treatment, and the tourmaline and TiO2 are bound by Ti-O-Si bonds. Since tourmaline has permanent polarity , And the synergy with TiO2 can effectively improve the photocatalytic activity of nano-TiO2. When the content of tourmaline is 0.5% (mass fraction), the sample calcined at 500 ℃ can reach the optimal degradation rate of 98.5% after 1 h of illumination, which is lower than that of pure nano-TiO2 without hydrothermal treatment Increased by about 44.9% and 33.7%.