含吡啶单元给体-受体-给体型共轭聚合物/TiO_(2)空心球复合物的制备及其光催化活性研究

Preparation and Photocatalytic Property of Donor-Acceptor-Donor Type Conjugated Polymers Containing Pyridine Unit/TiO_(2) Composites

制备了含吡啶单元低能带隙给体-受体-给体(D-A-D)型共轭聚合物:聚(2,5-二(2-(3,4-乙撑二氧噻吩))基吡啶)与TiO2空心球的复合物(反应体系中,单体(2,5-二(2-(3,4-乙撑二氧噻吩))基吡啶)与TiO_(2)的质量比为1︰2、1︰3和1︰4),并研究了该类复合物的光催化活性.采用傅里叶变换红外光谱、X射线衍射、扫描电镜和透射电镜等测试对该复合材料的结构和形貌进行了表征.结果表明:TiO_(2)空心球呈锐钛矿相结构,其表面负载有聚(2,5-二(2-(3,4-乙撑二氧噻吩))基吡啶).在模拟太阳光照射下,对罗丹明B水溶液进行光降解,发现单体与TiO_(2)的质量比为1︰3时的复合物光催化降解效率最高,光照240 min降解效率可以达到92.1%,证明该聚合物的引入提高了TiO_(2)空心球的光催化性能.

The composites of low band gap donor-acceptor-donor(D-A-D)type conjugated polymer containing pyridine units:poly(2,5-bis(2-(3,4-ethylenedioxythiophene))pyridine)with TiO_(2) hollow microspheres(the mass ratio of monomer(2,5-bis(2-(3,4-ethylenedioxythiophene))pyridine)to TiO_(2) is 1︰2,1︰3 and 1︰4 in the reaction system)was prepared,and the photocatalytic activity of this type of composite materials were studied.The structure and morphology of the composite materials were characterized by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).The results showed that the TiO_(2) hollow microspheres had anatase phase structure,and their surface was loaded by poly(2,5-bis(2-(3,4-ethylenedioxythiophene))pyridine).It was found that the rate of photocatalytic degradation of Rhodamine B by composite was the highest under simulated sunlight irradiation,when the mass ratio of monomer to TiO_(2) was 1︰3,and the highest degradation rate of Rhodamine B was 92.1%after 240 min,which proved that the combination of polymers improves the photocatalytic performance of TiO_(2) hollow microspheres.