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将浓碱水热法制备的钛酸盐纳米管(TNT),采用二次水热和高温煅烧法制备了不同形貌的锐钛矿相TiO2纳米管(NT)和TiO2纳米棒(NB)光催化剂,通过XRD、TEM、UV-vis漫反射吸收光谱(DRS)对产物进行表征,研究光催化剂对氯霉素的光催化降解性能。结果表明,不同形貌TiO2光催化剂对氯霉素具有不同的催化活性,TiO2纳米管(NT)比TiO2纳米棒(NB)有更好的吸附性能;在高压汞灯辐射下,TiO2纳米棒(NB)对氯霉素的光催化降解效率高于TiO2纳米管(NT)。在高压汞灯下TiO2纳米管(NT)和TiO2纳米棒(NB)对氯霉素的光催化降解过程均遵从Langmuir-Hinshelwood动力学模型。
The titanate nanotubes (TNTs) prepared by concentrated alkali hydrothermal method were used to prepare anatase TiO2 nanotubes (NT) and TiO2 nanorods (NB) with different morphologies by secondary hydrothermal calcination and high temperature calcination The catalysts were characterized by XRD, TEM and UV-vis diffuse reflectance absorption spectroscopy (DRS) to study the photocatalytic degradation of chloramphenicol. The results show that TiO2 photocatalysts with different morphologies have different catalytic activity to chloramphenicol. TiO2 nanotubes (NT) have better adsorption properties than TiO2 nanorods (NB). Under high pressure mercury lamp irradiation, TiO2 nanorods NB) was more efficient in photocatalytic degradation of chloramphenicol than in nanotubes (NT). The photocatalytic degradation of chloramphenicol by TiO2 nanotubes (NT) and TiO2 nanorods (NB) under high pressure mercury lamp both follow the Langmuir-Hinshelwood kinetic model.