ZnO/CdS/CoFe_2O_4复合磁性光催化剂降解四环素抗生素

Degradation of tetracyclines antibiotics by ZnO / CdS / CoFe_2O_4 composite magnetic photocatalyst

利用单晶Si辅助水热法低温合成了Zn O/Cd S/Co Fe2O4复合磁性光催化剂。采用X射线衍射仪、场发射扫描电子显微镜、振动样品磁强计及紫外-可见分光光度计等对产物进行表征。以四环素(TC)、强力霉素(DC)和盐酸土霉素(OTC)3种四环素类抗生素为降解目标,模拟测试样品在日光和紫外光下的光催化性能,并对Zn O/Cd S/Co Fe2O4复合磁性光催化剂的重复利用性进行测试。结果表明,圆柱形Zn O尺寸在500 nm,其表面粘附了大量尺寸在100 nm的块状颗粒即为Cd S/Co Fe2O4纳米粒子,样品对TC、DC和OTC的降解率分别达到了88.50%,75.36%和60.37%,重复使用三个循环,Zn O/Cd S/Co Fe2O4对TC的降解率仍保持75%以上。

Zn O / Cd S / Co Fe2O4 composite magnetic photocatalysts were synthesized at low temperature by hydrothermal method with assistance of Si（ 100）. The synthesized samples were characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,vibrating sample magnetometer（ VSM） and UVVis diffusive reflectance spectroscopy（ DRS）. The photocatalytic degradation activity on tetracycline（ TC）,doxycycline（ DC） and oxytetraccline（ OTC） of the samples under the sunlight and ultraciolet irradiation was evaluated. In addition,the reusability of Zn O / Cd S / Co Fe2O4 composite magnetic photocatalyst was tested. The results show that the cylindrical Zn O with the size of 500 nm was coated by a large block Cd S / Co Fe2O4 nanoparticles with the diameter of 100 nm. The degradation on TC,DC and OTC of the samples reaches 88. 50%,75. 36% and 60. 37%,and the TC degradability of Zn O / Cd S / Co Fe2O4 remained above 75% after repeated three cycles.