Alrousan Dheaya M A, Dunlop Patrick S M, McMurray Trudy A, Byrne J Anthony
Photocatalysis Research Group, Nanotechnology and Integrated Bioengineering Centre, University of Ulster, Shore Road, Newtownabbey, Northern Ireland BT37 0QB, UK.
Water Res. 2009 Jan;43(1):47-54. doi: 10.1016/j.watres.2008.10.015. Epub 2008 Oct 18.
Photocatalysis is a promising method for the disinfection of potable water in developing countries where solar irradiation can be employed, thus reducing the cost of treatment. In addition to microbial contamination, water normally contains suspended solids, dissolved inorganic ions and organic compounds (mainly humic substances) which may affect the efficacy of solar photocatalysis. In this work the photocatalytic and photolytic inactivation rates of Escherichia coli using immobilised nanoparticle TiO2 films were found to be significantly lower in surface water samples in comparison to distilled water. The presence of nitrate and sulphate anions spiked into distilled water resulted in a decrease in the rate of photocatalytic disinfection. The presence of humic acid, at the concentration found in the surface water, was found to have a more pronounced affect, significantly decreasing the rate of disinfection. Adjusting the initial pH of the water did not markedly affect the photocatalytic disinfection rate, within the narrow range studied.
光催化是一种很有前景的方法，可用于在能够利用太阳辐射的发展中国家对饮用水进行消毒，从而降低处理成本。除了微生物污染外，水通常还含有悬浮固体、溶解的无机离子和有机化合物（主要是腐殖质），这些可能会影响太阳能光催化的效果。在这项工作中，发现与蒸馏水相比，使用固定化纳米颗粒TiO2薄膜时，大肠杆菌在地表水样品中的光催化和光解失活率显著降低。向蒸馏水中添加硝酸盐和硫酸根阴离子会导致光催化消毒速率降低。发现地表水浓度的腐殖酸的存在具有更显著的影响，显著降低了消毒速率。在所研究的狭窄pH范围内，调节水的初始pH对光催化消毒速率没有明显影响。
