Faculty of Engineering and IT, University of Technology, Sydney, P.O. Box 123, Broadway, NSW 2007, Australia.
Bioresour Technol. 2010 Mar;101(5):1453-8. doi: 10.1016/j.biortech.2009.06.096. Epub 2009 Jul 25.
In this study, titanium (Ti), ferric (Fe) and aluminum (Al) salt flocculants were compared for their efficiency in treating wastewater collected from Sydney Olympic Park wastewater treatment plant by following the jar test procedure. Produced sludge from Ti-salt flocculation was dried and titanium dioxide (TiO2) nanoparticles were generated after the incineration of sludge produced from the Ti-salt flocculation of wastewater. Later on, titanate nanotubes were synthesized after TiO2 nanoparticles were hydrothermally treated with 10 N NaOH solution at 130 degrees C for 24 h. Titanate nanotubes were either acid or deionised water-washed, while thiourea-doping was employed to produce visible light-responsive nanotubes. Wastewater flocculation using Ti-salt was found to be as efficient as Fe and Al flocculation in terms of turbidity and DOC removal. XRD results showed that the anatase structure was predominant for TiO2 nanoparticles, while thiourea-doped titanate nanotubes only indicated anatase structure with an increased crystallinity after being crystallized at 600 degrees C. The photocatalytic activity of all photocatalysts was evaluated using the photooxidation of acetaldehyde. Thiourea-doped nanotubes showed a greater photocatalytic activity than as-prepared TiO2 nanoparticles, deionised water-washed, acid-washed titanate nanotubes and P25 under UV and visible light irradiation.
在这项研究中，通过遵循 jar 测试程序，比较了钛（Ti）、铁（Fe）和铝（Al）盐絮凝剂在处理悉尼奥林匹克公园废水处理厂收集的废水方面的效率。Ti 盐絮凝产生的污泥经过干燥后，在 Ti 盐絮凝废水产生的污泥焚烧后生成了二氧化钛（TiO2）纳米粒子。随后，将 TiO2 纳米粒子在 10 N NaOH 溶液中于 130°C 下水热处理 24 小时，合成了钛酸盐纳米管。钛酸盐纳米管经过酸或去离子水洗涤，同时采用硫脲掺杂制备了对可见光有响应的纳米管。就浊度和 DOC 去除而言，Ti 盐废水絮凝的效果与 Fe 和 Al 絮凝一样高效。XRD 结果表明，TiO2 纳米粒子主要为锐钛矿结构，而经过 600°C 结晶后，硫脲掺杂的钛酸盐纳米管仅显示出锐钛矿结构且结晶度增加。所有光催化剂的光催化活性均通过乙二醛的光氧化进行评估。在紫外光和可见光照射下，硫脲掺杂的纳米管的光催化活性大于未处理的 TiO2 纳米粒子、经去离子水洗涤、经酸洗涤的钛酸盐纳米管和 P25。
