Centre for Environmental Risk Assessment and Remediation, University of South Australia, Mawson Lakes SA 5095, Australia.
J Biomed Nanotechnol. 2009 Feb;5(1):121-9. doi: 10.1166/jbn.2009.1002.
Transparent anatase TiO2 nanometer thin films were prepared by dip-coating on soda-lime glass plates via the sol-gel method. The un-calcined and the calcined films were characterized by X-ray diffraction (XRD), AFM, Nano-indentation (hardness and Young's modulus), UV-vis spectrometry, thickness and hydrophilicity (contact angle measurements). The photocatalytic activity of the thin films was evaluated by performing disinfection studies on the Gram-negative microorganisms like Escherichia coli, and Staphylococcus Aureus, a Gram-positive organism. The photocatalytic activity for both groups of organisms was studied in saline and nutrient broth. The leakage of potassium from the bacteria was observed parallel to cell viability. The activity of the sol-gel prepared TiO2 thin films were compared under UV lamps and natural day light (ND) lamps with Degussa P-25 TiO2 thin films prepared on soda-lime glass using a polymer support and the commercial self-cleaning glass (SC). The sol-gel prepared thin films which were annealed at 450 degrees C, show highest photocatalytic activity, the slowest conversion rate from hydrophilic to a hydrophobic state, light-induced hydrophilicity, and also higher disinfection activities compared to P-25 films and commercial self-cleaning glass. The films also show excellent activities when continuously reused for more than a month.
透明锐钛矿二氧化钛纳米薄膜通过溶胶-凝胶法在钠钙玻璃平板上进行浸涂制备而成。未煅烧和煅烧的薄膜通过 X 射线衍射（XRD）、原子力显微镜（AFM）、纳米压痕（硬度和杨氏模量）、紫外可见分光光度法、厚度和润湿性（接触角测量）进行表征。通过对革兰氏阴性微生物如大肠杆菌和革兰氏阳性菌金黄色葡萄球菌进行消毒研究，评估了薄膜的光催化活性。在盐水和营养肉汤中研究了两组生物体的光催化活性。观察到钾从细菌中的泄漏与细胞活力平行。使用聚合物载体和商业自清洁玻璃（SC），在钠钙玻璃上制备 Degussa P-25 TiO2 薄膜，将溶胶-凝胶法制备的 TiO2 薄膜的活性与 UV 灯和自然光（ND）灯下的活性进行了比较。在 450°C 下退火的溶胶-凝胶制备的薄膜显示出最高的光催化活性、从亲水性到疏水性状态的最慢转化率、光诱导亲水性以及与 P-25 薄膜和商业自清洁玻璃相比更高的消毒活性。这些薄膜在连续重复使用一个月以上时也表现出优异的活性。
