钼系光催化抗菌材料的制备及性能研究

Preparation and properties of molybdenum photocatalytic antibacterial materials

摘要:

以水玻璃和碳酸氢钠作为硅胶原料,采用溶胶-凝胶法将钼离子负载到硅胶表面以制备钼系抗菌硅胶,通过单因素实验得到了其最佳制备条件。利用XRD、ICP、SEM、EDS、XPS、BET等对材料的晶体结构、离子浓度、表观形貌、负载形式、比表面积等进行了表征。另外,通过平板涂布法对样品的抗菌性能进行了检测；观察不同光源下亚甲基蓝溶液的降解情况,检测了复合材料的光催化效果。最后,结合表征和检测结果对材料抗菌机理和光催化机理进行了探讨。结果表明：在未改变硅胶结构形态的基础上成功制备无定型钼系光催化抗菌材料且对大肠杆菌的杀菌效果良好；在紫外和可见光条件下对亚甲基蓝溶液均有理想的降解效果；该材料具有光催化抗菌材料独特特点,既有抗菌效果也有光降解功能,同时还有良好的循环性。

Abstract:

With sodium bicarbonate and sodium silicate as silica materials, molybdenum ions were loaded onto silica gel surface by sol-gel method to prepare antibacterial molybdenum silica gel. The best preparation conditions were obtained by single factor experiment. XRD, ICP, SEM, EDS, XPS and BET were used to characterize the crystal structure, ion concentration, apparent morphology, loading form and specific surface area of the material. In addition, the antibacterial properties of the samples were tested by plate coating method. The photocatalytic effect of the composite was investigated by observing the degradation of methylene blue solution under different light sources. Finally, the antibacterial and photocatalytic mechanism of the material were discussed. The results showed that the amorphous molybdenum photocatalytic antibacterial material was successfully prepared without changing the structure and morphology of silica gel, and the bactericidal effect on Escherichia coli was good. The methylene blue solution has ideal degradation effect under ultraviolet and visible light. The material has the unique characteristics of photocatalytic antibacterial material, not only antibacterial effect and photodegradation function, but also good circulation.