Abstract:

To solve the problems of easy agglomeration and low activity in photocatalytic degradation of naproxen by TiO₂， the modified TiO₂ and graphene were mixed to produce modified TiO₂ catalysts， which were subsequently used for photocatalytic degradation of naproxen in water. The degradation kinetics， mechanism， and biotoxicity were investigated. The XRD， FTIR， and SEM characterization results showed that TiO₂ was modified with the introduction of amino groups， and there were electrostatic attraction and chemical bond force between the amino group and oxygen-containing group of modified grapheme. And under the action of these forces， TiO₂ was better grafted on the surface of graphene. The results of dark adsorption， biotoxicity， catalytic and quenching experiments showed that under the light conditions of 500 W xenon lamp， relying on the graphene， TiO₂ could mineralize 10 mg/L naproxen nearly completely within 50 min. The mineralization was synergistic oxidation of h⁺ and ·OH. The biotoxicity was reduced from 25.23% to 11.67%.The experimental results showed that the improved TiO₂ preparation method was direct， simple and reliable， and solved the problems of easy agglomeration and low activity， which was a photocatalytic material with potential applications.

Key words: graphene, titanium dioxide, naproxen, photocatalysis

摘要：

为解决TiO₂光催化降解水体中萘普生时易团聚、低活性的问题，对P25 TiO₂和石墨烯进行表面修饰，直接混合制得改进TiO₂催化剂，随后将其用于光催化降解水体中的萘普生，并研究降解动力学、作用机制以及生物毒性。XRD、FTIR、SEM表征结果表明，TiO₂经过修饰后引入了氨基，与改性石墨烯引入的含氧基团之间存在静电引力和化学键力，在这些力的作用下，TiO₂较好地接枝在石墨烯的表面。暗吸附、生物毒性、催化和猝灭实验结果表明，在500 W氙灯光照条件下，依靠石墨烯的协助，TiO₂在50 min内能将10 mg/L的萘普生接近完全矿化，矿化方式主要为h⁺与•OH协同氧化，生物毒性由母体的25.23%降至11.67%。实验结果表明改进TiO₂的制备方法直接、简单、可靠，可较好地解决P25 TiO₂易团聚、低活性的问题，是一种具有潜在应用前景的光催化材料。

关键词: 石墨烯, 二氧化钛, 萘普生, 光催化

CLC Number: 

• X703