钛酸异丙酯:乙酰丙酮摩尔比对 TiO 薄膜光催化活性的影响。
Effect of the Titanium Isopropoxide:Acetylacetone Molar Ratio on the Photocatalytic Activity of TiO Thin Films.
机构信息
Laboratory of Thin Films Chemical Technologies, Department of Materials and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.
Laboratory of Optoelectronic Materials Physics, Department of Materials and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.
出版信息
Molecules. 2019 Nov 27;24(23):4326. doi: 10.3390/molecules24234326.
TiO thin films with different titanium isopropoxide (TTIP):acetylacetone (AcacH) molar ratios in solution were prepared by the chemical spray pyrolysis method. The TTIP:AcacH molar ratio in spray solution varied from 1:3 to 1:20. TiO films were deposited onto the glass substrates at 350 °C and heat-treated at 500 °C. The morphology, structure, surface chemical composition, and photocatalytic activity of the obtained TiO films were investigated. TiO films showed a transparency of ca 80% in the visible spectral region and a band gap of ca 3.4 eV irrespective of the TTIP:AcacH molar ratio in the spray solution. TiO films consist of the anatase crystalline phase with a mean crystallite size in the range of 30-40 nm. Self-cleaning properties of the films were estimated using the stearic acid (SA) test. A thin layer of 8.8-mM SA solution was spin-coated onto the TiO film. The degradation rate of SA as a function of irradiation time was monitored by Fourier-transform infrared spectroscopy (FTIR). An increase in the TTIP:AcacH molar ratio from 1:4 to 1:8 resulted in a ten-fold increase in the photodegradation reaction rate constant (from 0.02 to the 0.2 min) under ultraviolet light and in a four-fold increase under visible light.
采用化学喷雾热解法，制备了钛酸异丙酯（TTIP）：乙酰丙酮（AcacH）不同摩尔比的 TiO 薄膜。喷雾溶液中 TTIP：AcacH 的摩尔比从 1:3 变化到 1:20。TiO 薄膜在 350°C 下沉积在玻璃基板上，并在 500°C 下进行热处理。研究了所得 TiO 薄膜的形貌、结构、表面化学成分和光催化活性。TiO 薄膜在可见光区的透光率约为 80%，带隙约为 3.4 eV，与喷雾溶液中的 TTIP：AcacH 摩尔比无关。TiO 薄膜由锐钛矿晶相组成，平均晶粒尺寸在 30-40nm 范围内。通过硬脂酸（SA）测试评估了薄膜的自清洁性能。将 8.8mM 的 SA 溶液旋涂在 TiO 薄膜上。通过傅里叶变换红外光谱（FTIR）监测 SA 的降解速率随辐照时间的变化。随着 TTIP：AcacH 摩尔比从 1:4 增加到 1:8，紫外光下光降解反应速率常数（从 0.02 增加到 0.2 min）增加了 10 倍，可见光下增加了 4 倍。
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