易分离回收的BiOBr/TiO_(2)/PAN催化剂的制备及光催化降解盐酸四环素研究

Preparation of Easily Separated and Recovered BiOBr/TiO_(2)/PAN Catalyst and Photocatalytic Degradation of Tetracycline Hydrochloride

为了用BiOBr提高TiO_(2)的光催化活性,人们进行了大量的研究。然而,大多数工作合成的都是粉体结构,难以回收且易造成二次污染。本文通过静电纺丝技术结合溶剂热法制备了柔性BiOBr/TiO_(2)/PAN纳米纤维膜,因其独特的自支撑膜结构,使问题得到解决。通过SEM、TEM、XPS、XRD和BET等对其结构和形貌进行表征,使用UV-Vis DRS、EIS和i-t测试对其光电性能进行分析。结果表明,与单独的TiO_(2)/PAN相比,在可见光照射下,BiOBr/TiO_(2)/PAN纳米纤维膜对盐酸四环素(TC)降解的光催化活性增强,在140min内降解效率达到72.97%;5次循环实验中,催化剂的性能趋于稳定,循环后催化剂的XRD和SEM分析表明其形貌和晶体结构没有发生改变,表现出优异的耐久性。

A lot of research has been done to improve the photocatalytic activity of TiO_(2) with BiOBr.However,most of the work synthesized a powder structure,which has the problem of being difficult to recycle.In this paper,flexible BiOBr/TiO_(2)/PAN nanofiber membranes were prepared by electrostatic spinning technique combined with solvothermal method,which makes them easy to be recycled due to their unique self-supporting membrane structure.The structure and morphology of prepared nanofiber membrane were characterized by SEM,TEM,XPS,XRD and BET,and the photoelectric properties of it were analyzed by UV-Vis DRS,EIS and i-t test.The results showed that its photocatalytic activity for the degradation of tetracycline hydrochloride(TC)under visible light irradiation was enhanced compared with that of TiO_(2)/PAN alone,and the degradation efficiency reached 72.97%within 140 min;the catalytic performance of the catalysts tended to be stabilized in the five cycling experiments,and the post-cycling XRD and SEM showed that the catalyst morphology and crystal structure did not change,demonstrating excellent durability.