溶胶-凝胶法制备Ag/TiO2纳米薄膜及其陶瓷表面抗菌性能研究

Preparation and Properties of Ag/TiO2 Nanofilms by Sol-Gel Method and Antibacterial Application for the Ceramic Surfaces

摘要:

为提升TiO₂在陶瓷表面的光催化性能和抗菌性能，以钛酸四丁酯、无水乙醇、硝酸银为原料，乙酰丙酮和硝酸作为催化抑制剂，采用溶胶-凝胶法分别制备了TiO₂溶胶和Ag/TiO₂溶胶。以普通陶瓷片为载体，采用浸渍-提拉法制备TiO₂薄膜。以亚甲基蓝为目标降解物进行光催化降解实验，并探讨在不同热处理温度下对Ag/TiO₂薄膜光催化性能的影响。利用X射线衍射仪（XRD）、扫描电子显微镜(SEM)、傅里叶红外光谱仪(FT-IR)等仪器对样品进行表征。实验结果表明：在紫外灯照射下，TiO₂薄膜和Ag/TiO₂薄膜对有机物都具有降解能力，而Ag/TiO₂的光催化活性更明显，在光照8 h后其光催化降解率达到了70%，热处理最佳温度为500 ℃；Ag/TiO₂薄膜具有良好的亲水性，并且对大肠杆菌和金黄色葡萄球菌具有抑制作用。Ag/TiO₂薄膜有望应用到陶瓷用品上，可有效减少材料表面的有机污染物，并且经过高温处理后还可以保持良好的光催化性能。

Abstract:

In order to enhance the photocatalytic and antibacteria properties of TiO₂ on ceramic surfaces， experiments were carried out to prepare TiO₂ sols and Ag/TiO₂ sols by the sol-gel method using tetrabutyltitanate， anhydrous ethanol and silver nitrate as raw materials and acetylacetone and nitric acid as catalytic inhibitors， respectively. Ordinary ceramic sheets were utilized as carriers to prepare nano-TiO₂ films by the impregnation-lift method. The photocatalytic degradation experiments were conducted with methylene blue as the target degradation species and the effects on the photocatalytic performance of Ag/TiO₂ films were investigated under different heat treatment temperatures. The samples were characterized by X-ray diffractometer （XRD）， scanning electron microscope （SEM）， and Fourier infrared spectrometer （FT-IR）. The experimental results show that both the TiO₂ and Ag/TiO₂ films had degradation ability for the organic matter under UV light irradiation， while the photocatalytic activity of Ag/TiO₂ was more obvious， and the photocatalytic degradation rate reached 70% after 8 h of light irradiation， where the optimal temperature of heat treatment was 500℃. The Ag/TiO₂ films were found to have good hydrophilic and inhibitory effects on Escherichia coli and Staphylococcus aureus. This is expected to be applied to ceramic articles to effectively reduce organic contaminants on the surface of the material and to maintain excellent photocatalytic properties after high-temperature treatment.