铈掺杂磷酸银/卟啉复合光催化剂降解螺旋霉素的研究

The Research on the Degradation of Spiramycin by Cerium-doped Silver Phosphate/Porphyrin Composite Photocatalyst

通过与5,10,15,20-四(4-羧基苯基)卟啉(TCPP)复合,构筑了Ce-Ag_(3)PO_(4)/TCPP异质结复合催化剂,研究其对螺旋霉素(SPM)的催化降解性能。采用SEM、XRD、XPS、UV-Vis DRS和FTIR等方法表征和剖析催化剂材料的微观化学结构、化学组成及光化学性能,并进一步阐明光催化降解SPM的反应机理。Ce-Ag_(3)PO_(4)/TCPP光催化剂在可见光照射6 h对SPM的降解率为87.7%,降解速率常数是纯Ag_(3)PO_(4)的5.8倍。光电化学测量(光电流响应、电化学阻抗)、ESR测试、自由基捕获和PL光谱分析结果表明:铈离子(Ce^(3+))的掺杂,可有效增大催化剂的比表面积,减少电子-空穴对的复合;引入TCPP能加速电子转移,增强光吸收性能,从而提高光催化活性。这种掺杂复合催化剂为高效光降解SPM提供了一种简捷和高效的途径。

A Ce-Ag_(3)PO_(4)/TCPP heterojunction composite catalyst was constructed by combining with 5,10,15,20-tetra(4-carboxylphenyl)porphyrin(TCPP)to investigate its catalytic degradation performance for Spiramycin(SPM).Using SEM,XRD,XPS,UV-Vis DRS and FTIR methods to characterize and analyze the microchemical structure,chemical composition and photochemical properties of the catalysts and further clarify the reaction mechanism of SPM photocatalytic degradation.The Ce-Ag_(3)PO_(4)/TCPP photocatalyst has a degradation ratio of 87.7%for SPM under visible light irradiation for 6 h,and the degradation rate constant is 5.8 times that of pure Ag_(3)PO_(4).Photoelectrochemical measurements(photocurrent response,electrochemical impedance),ESR test,radical trapping,and PL spectral analysis results show that the doping of cerium ions(Ce^(3+))can effectively increase the specific surface area of the catalyst and reduce the recombination of electron-hole pairs;the introduction of TCPP can accelerate electron transfer and enhance light absorption performance,thereby enhancing the photocatalytic activity.This doped composite catalyst provides a simple and efficient route for efficient photodegradation of SPM.