Faculty of Engineering and Information Technology, University of Technology, Sydney (UTS), PO Box 123, Broadway 2007, Australia.
Water Res. 2013 Aug 1;47(12):4115-25. doi: 10.1016/j.watres.2012.12.045. Epub 2013 Mar 22.
In this study, Degussa P25 TiO2 was partially dissolved in a mixture of hydrogen peroxide and sodium hydroxide at high pH. The fabrication of nanofibres proceeded by the hydrothermal treatment of the solution at 80 °C. This was followed by acid wash in HCl at pH 2 for 60 min, which resulted in the formation of hydrogen-titanate nanofibres. The nanofibres were annealed at 550 °C for 6 h to produce crystalline anatase nanofibres. The nanofibres were characterised for physico-chemical modifications and tested for the adsorption and photocatalytic degradation of methylene blue as a model water pollutant. An average specific surface area of 31.54 m(2)/g, average pore volume of 0.10 cm(3)/g and average pore size of 50 Å were recorded. The nanofibres were effective adsorbents of the model pollutant and adsorbents and good photocatalysts under simulated solar light illumination. No reduction in photocatalytic activity was observed over three complete treatment cycles, and the effective separation of nanofibres was achieved by gravity settling resulting in low residual solution turbidity.
在这项研究中，Degussa P25 TiO2 部分溶解在高 pH 值的过氧化氢和氢氧化钠混合物中。溶液在 80°C 下进行水热处理，然后进行酸浸洗（pH 值为 2 的 HCl 中 60 分钟），这导致了氢钛酸盐纳米纤维的形成。纳米纤维在 550°C 下退火 6 小时，生成结晶锐钛矿纳米纤维。对纳米纤维进行物理化学改性表征，并测试其对亚甲基蓝作为模型水污染物的吸附和光催化降解性能。记录到的平均比表面积为 31.54 m²/g，平均孔体积为 0.10 cm³/g，平均孔径为 50 Å。纳米纤维是模型污染物的有效吸附剂，在模拟太阳光照射下也是良好的光催化剂。在三个完整的处理循环中，光催化活性没有下降，通过重力沉降有效地分离纳米纤维，导致残留溶液浊度低。
