Abstract Graphene oxide was prepared by modified Hummers method, MnV13/GO composite was prepared by solution blending method, and MnV13/GO/PANI composite catalyst was prepared by interfacial method. The catalyst was characterized by ultraviolet-visible absorption spectroscopy (UV-Vis), infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and N2 adsorption-desorption. The results show that the V-O-V bonds of the polymerized heteropoly complex are blue-shifted and the V-Od bonds are red-shifted slightly from conjugation between V-Od and GO lamellae. The photocatalytic properties of the catalyst for malachite green showed that degradation of malachite green was 92.7% after 200 min of UV irradiation. The degradation under sunlight was better than that under ultraviolet light, reaching 97.2%. The degradation of malachite green by the catalyst is a first-order kinetic reaction. We find that such a MnV13/GO/PANI composite exhibits higher photocatalytic activity than MnV13/GO, MnV13 and GO toward the liquid-phase degradation of malachite green under both UV and sunlight irradiation. The presence of synergic effect between PANI and MnV13 is believed to play an essential role in affecting the photoreactivity. At last, the roles of active species in the photocatalytic process are compared by using different types of active species scavengers. The degradation mechanism of the photocatalysts is proposed.

中文翻译：

---

MnV13/GO/PANI复合催化剂的合成及光催化活性

摘要 采用改良Hummers法制备氧化石墨烯，溶液共混法制备MnV13/GO复合材料，界面法制备MnV13/GO/PANI复合催化剂。通过紫外-可见吸收光谱（UV-Vis）、红外光谱（FT-IR）、X射线粉末衍射（XRD）、扫描电子显微镜（SEM）和N2吸附-解吸对催化剂进行表征。结果表明，聚合杂多复合物的 VOV 键发生蓝移，V-Od 键因 V-Od 和 GO 薄片之间的共轭而略微红移。孔雀石绿催化剂的光催化性能表明，紫外线照射200 min后孔雀石绿的降解率为92.7%。阳光下的降解优于紫外线下的降解，达到97.2%。催化剂对孔雀石绿的降解是一级动力学反应。我们发现这种 MnV13/GO/PANI 复合材料在紫外线和阳光照射下对孔雀石绿的液相降解表现出比 MnV13/GO、MnV13 和 GO 更高的光催化活性。PANI 和 MnV13 之间协同效应的存在被认为在影响光反应性方面起着重要作用。最后，通过使用不同类型的活性物种清除剂，比较了活性物种在光催化过程中的作用。提出了光催化剂的降解机理。MnV13 和 GO 在紫外线和阳光照射下对孔雀石绿的液相降解。PANI 和 MnV13 之间协同效应的存在被认为在影响光反应性方面起着重要作用。最后，通过使用不同类型的活性物种清除剂，比较了活性物种在光催化过程中的作用。提出了光催化剂的降解机理。MnV13 和 GO 在紫外线和阳光照射下对孔雀石绿的液相降解。PANI 和 MnV13 之间协同效应的存在被认为在影响光反应性方面起着重要作用。最后，通过使用不同类型的活性物种清除剂，比较了活性物种在光催化过程中的作用。提出了光催化剂的降解机理。