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采用液相沉积法在纳米TiO2表面沉积SiO2形成SiO2-TiO2纳米复合微粒,然后用γ-氨丙基三乙氧基硅烷(KH-550)对SiO2-TiO2微粒进行表面部分修饰,制备了两亲性TiO2界面光催化剂。采用XRD、TEM、FT-IR和TG-DTA等技术研究了所得样品的形态结构和包覆情况。结果表明,SiO2-TiO2复合微粒中TiO2呈锐钛矿型,且其表面均匀地包覆着一层SiO2膜,对SiO2-TiO2纳米复合微粒进行部分改性后,所得样品具有界面两亲性质,紫外光照射2 h后仍能够稳定地悬浮在油-水两相界面。以亚甲基蓝的光催化降解反应为模型反应,考察了TiO2界面光催化剂的催化性能,试验结果表明,在紫外光照射下,TiO2界面光催化剂对亚甲基蓝的脱色降解效果明显优于纯TiO2,反应2 h后脱色率达到75%左右;并且TiO2界面光催化剂由于可以稳定悬浮于界面上而便于回收。
The SiO2-TiO2 nanocomposite particles were deposited on the surface of nano-TiO2 by liquid-phase deposition method, and then the surface of SiO2-TiO2 particles was partly modified by γ-aminopropyltriethoxysilane (KH-550) TiO2 interface photocatalyst. The morphology and coating of the obtained samples were studied by XRD, TEM, FT-IR and TG-DTA. The results show that the TiO2 in the SiO2-TiO2 composite particles is anatase, and the surface of the TiO2 particles is uniformly coated with a SiO2 film. After partial modification of the SiO2-TiO2 nano-particles, the obtained sample has the amphiphilic interface, After 2 h of UV irradiation, it can still be stably suspended in the oil-water interface. The photocatalytic degradation reaction of methylene blue was used as a model reaction. The photocatalytic activity of TiO2 photocatalyst was investigated. The experimental results showed that under UV light irradiation, the degradation of methylene blue by TiO2 photocatalyst was better than pure TiO2, After decolorization rate of about 75%; and TiO2 interfacial photocatalyst due to the stable suspension in the interface and easy recovery.