石墨烯基S掺杂TiO2光催化降解罗红霉素的研究

Research on photocatalytic degradation of roxithromycin by graphene based S doped TiO_2

为降解废水中的罗红霉素,通过湿法(煅烧一定配比的TiO_2与硫脲)制备S-TiO_2,并负载到石墨烯(RGO)上,得到石墨烯负载S掺杂TiO_2光催化剂(S-TiO_2-RGO);通过透射电镜、扫描电镜、X射线荧光衍射和紫外可见漫散射来表征其结构;以氙灯为光源模拟可见光,S-TiO_2-RGO为光催化剂,降解废水中的罗红霉素。结果表明,当光催化剂投加量为500 mg/L、p H=4.0、反应时间为210 min时,废水中初始浓度为100 mg/L的罗红霉素的降解率可达91.6%;并通过添加空穴与羟基自由基(·OH)的捕获剂探究了S-TiO_2-RGO光催化机理。

In order to degrade roxithromycin in wastewater, S-TiO2 were prepared by wet method（calcining at a certain ratio of TiO2 and thiourea）, and loaded onto the graphene（RGO）, the photocatalyst of S doped TiO2 and graphene composites（S-TiO2-RGO） was obtained. The structure of photocatalyst was characterized by transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, X ray diffraction（XRD） and UV vis diffuse scattering. With xenon lamp as light source and S-TiO2-RGO as photocatalyst, roxithromycin in wastewater was degraded. The results show that when the photocatalyst dosage was 500 mg / L, pH=4, reaction time was 210 min, the initial concentration of wastewater was 100 mg / L, roxithromycin degradation rate can reach 91.6%. The photocatalytic mechanism of S-TiO2-RGO was explored by adding holes and the trapping agent of·OH.