互花米草绿色合成ZnO纳米颗粒及其光催化和抑菌性能

Green Synthesized ZnO Nanoparticles from Spartina alterniflora and their Photocatalytic and Antibacterial Properties

利用互花米草(SAF)叶提取物采用溶胶-凝胶法合成了ZnO纳米颗粒(Nano-ZnO),采用扫描电子显微镜(SEM)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)对其表面形貌、活性基团、晶型结构和光吸收特性进行了表征,分析了ZnO纳米颗粒对孔雀石绿(MG)的光催化降解活性以及对金黄色葡萄球菌的抑菌性能。结果表明:采用互花米草叶提取物绿色合成的ZnO纳米颗粒具有丰富的含氧活性基团、较小的粒径和良好的分散性;经计算Nano-ZnO带隙能为3.09 eV,表明其光吸收利用效率较高;可见光下Nano-ZnO对孔雀石绿(MG)的降解效率达到98.2%;在光催化降解过程中,h^(+)和·O^(2-)是发挥作用的主要活性物种;Nano-ZnO对金黄色葡萄球菌的抑菌率是ZnO的2倍。该研究为互花米草的高值化利用提供了新途径,同时为纳米金属氧化物的制备提供了新方法。

The sol-gel method was used to green synthesize ZnO nanoparticles(Nano-ZnO)with Spartina alterniflora(SAF)leaf extract,and the surface morphology,active groups,crystal structure and light absorption characteristics were characterized by scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and ultraviolet-visible diffuse reflectance spectroscopy(UV-Vis DRS),and the photocatalytic degradation activity of Nano-ZnO on Malachite green(MG)and the antibacterial properties of Staphylococcus aureus were analyzed.The results show that the green synthesis of Nano-ZnO with SAF extract has abundant oxygen-containing active groups,smaller particle size and good dispersibility.The calculated band gap energy of Nano-ZnO is 3.09 eV,which indicates that its efficiency of light absorption and utilization has been improved.The degradation efficiency of Nano-ZnO on malachite green reaches 98.2%in visible light,h^(+) and·O^(2-) are the main active species that play a role in the photocatalytic degradation process.The antibacterial rate of Nano-ZnO against Staphylococcus aureus is twice that of ZnO.This study provides a new way for the high-value utilization of SAF and a new method for the preparation of nano-metal oxides.