光催化剂AgBr/Ag2MoO4@AgVO3的结构表征及其抗菌防污性能

目的制备新型的光催化复合材料,提高其光催化性能。方法通过水热法和原位生长法制备不同摩尔比的AgBr/Ag_2MoO_4@AgVO_3光催化剂。采用X射线衍射(XRD)、扫描电镜(SEM)和高分辨透射电子显微镜(HRTEM)等一系列手段对所制备的光催化剂进行表征,并以可见光为光源,有机污染物罗丹明B(RhB)为降解对象,进行光催化活性测试,考察不同复合量的光催化剂对反应活性的影响。同时,以铜绿假单胞菌细胞、金黄色葡萄球菌和大肠杆菌为模式菌,进行抗菌试验考察光催化剂的杀菌性能。结果该复合材料通过AgVO_3的(501)晶面、Ag_2MoO_4的(311)面和AgBr的(200)晶面紧密连接。在罗丹明B(RhB)溶液中加入该复合材料,120 min内降解率达到了94.9%,而纯AgVO_3的降解率为7.8%,说明复合后的材料光催化性能明显提高。此外,在光催化杀菌实验中,超过99.99%的大肠杆菌、金黄色葡萄球菌和铜绿假单胞菌细胞均在90 min内被杀死。结论复合后的AgBr/Ag_2MoO_4@AgVO_3异质结光催化剂具有优异的光催化降解性能、杀菌性能和稳定性,该催化剂对于环境污染的治理以及海洋杀菌防污处理都起到一定的作用。

Structural Characterization and Its Antibacterial and Antifouling Properties of AgBr/Ag2MoO4@AgVO3 Photocatalyst

Objective To prepare novel photocatalytic composite material and improve its photocatalytic performance. Methods AgBr / Ag2MoO4 @ AgVO3 photocatalysts with different molar ratios were prepared with hydrothermal process and in situ growth method. The morphology and structure of AgBr/Ag2MoO4@AgVO3 nanocomposites were revealed by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The organic pollutant rhodamine B (RhB) was taken as the degradation target to carry out photocatalytic activity tests to investigate effects of photocatalytic performance with composite materials of different molar ratios under visible light irradiation. At the same time, P. aeruginosa, S. aureus and E. coli were used as model bacteria to carry out antibacterial tests to investigate the bactericidal properties of the photocatalysts. Results The composites were tightly connected by the (501) lattice plane of AgVO3, the (311) plane of Ag2MoO4, and the (200) lattice plane of AgBr. The photodegradation rate for Rhodamine B (RhB) reached 94.9% within 12 min after the composite was added, but 7.8% of the RhB was degraded when pure AgVO3 was used, which showed that the photocatalytic performance of the composite material was obviously improved. In addition, in the photocatalysis sterilization test, more than 99.99% of E. coli, S. aureus, and P. aeruginosa cells were killed within 90 minutes. Conclusion The AgBr/Ag2MoO4 @ AgVO3 photocatalyst has excellent photocatalytic degradation performance, bactericidal performance and stability, which can play a certain role in treatment of environmental pollution and marine sterilization and antifouling treatment.