负载型黑磷量子点光催化降解水中磺胺甲恶唑  

Effective and stable photocatalytic degradation of sulfonamides antibiotics over supported black phosphorus quantum dots

作　　者：姜婷婷 周至城 茅丹俊 付翯云 JIANG Tingting;ZHOU Zhicheng;MAO Danjun;FU Heyun(School of the Environment,State Key Laboratory of Pollution and Resource Reuse,Nanjing University,Nanjing,210093,China)

机构地区：[1]南京大学环境学院,污染控制与资源化研究国家重点实验室,南京210093

出　　处：《环境化学》2022年第7期2162-2169,共8页Environmental Chemistry

基　　金：江苏省自然科学基金(BK20190059);国家自然科学基金(21976086)资助。

摘　　要：本论文以二氧化钛(TiO_(2))为载体,通过超声辅助沉淀沉积法制备了黑磷量子点(BPQDs)负载型催化剂BP@TiO_(2),采用X射线衍射、透射电镜、紫外可见漫反射等对其进行了表征,考察了BP@TiO_(2)催化剂在模拟太阳光下降解磺胺甲恶唑(SMX)的光催化活性.结果表明,BPQDs的负载提高了催化剂的光电子迁移能力,降低了光生电子-空穴对的复合率,使得BP@TiO_(2)的光催化性能相对于载体TiO_(2)有所提高.其中,BPQDs载荷量为0.049%wt.的催化剂活性最高,光催化降解SMX的初活性是TiO_(2)的4倍.循环光解实验表明,BP@TiO_(2)在4次循环实验后仍保持较高的光催化活性,证明了它有较好的耐光腐蚀性和光催化稳定性.BP@TiO_(2) photocatalysts composed of black phosphorus quantum dots(BPQDs)and titanium dioxide(TiO_(2)) were successfully synthesized via a deposition precipitation method assisted by sonication,and were characterized by X-ray diffraction(XRD),transmission electron microscope(TEM)and UV-vis diffuse reflectance spectroscopy(UV-vis DRS)techniques.The photocatalytic activity of BP@TiO_(2) were tested in the degradation of sulfamethoxazole(SMX)under simulated sunlight.The results showed that the loading of BPQDs improved the electron-hole separation efficiency.Compared with the pure TiO_(2),BP@TiO_(2) had a remarkably higher photodegradation efficiency for SMX.BP@TiO_(2) with BPQDs loading amount of 0.049%wt.exhibited the highest photocatalytic activity,which was 4 times higher than that of TiO_(2).The reuse experiments showed that BP@TiO_(2) retained 90%of its initial photocatalytic activity after 4 consecutive catalyst cycles,indicating its high stability.

关 键 词：黑磷量子点 二氧化钛 磺胺类抗生素 光催化 催化稳定性 

分 类 号：X52[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]