ARC Centre of Excellence for Functional Nanomaterials, School of Chemical Sciences and Engineering, The University of New South Wales, Sydney NSW 2052, Australia.
Water Res. 2010 Apr;44(8):2525-32. doi: 10.1016/j.watres.2010.01.036. Epub 2010 Feb 2.
The effect of TiO2 photocatalytic oxidation on the natural organic matter (NOM) properties of two Australian surface waters were quantified using UV-vis spectroscopy, high performance size exclusion chromatography (HPSEC) with a multi-wavelength UV detector, liquid chromatography with organic carbon detector (LC-OCD), and trihalomethane formation potential (THMFP) analyses. Both the UV absorbance at wavelengths greater than 250 nm and dissolved organic carbon (DOC) content decreased significantly with treatment, although complete mineralization of NOM could not be achieved. Multi-wavelength UV detection of HPSEC analysis was shown to be useful to display further changes to NOM composition and molecular weight profiles because the organic molecules was transformed into compounds that absorb weakly at the typical detection wavelength of 250-260 nm. The multi-wavelength HPSEC results also revealed that photocatalytic oxidation yields by-products with a low aromaticity and low molecular weight. The LC-OCD chromatograms indicated that low molecular acids and neutral compounds remained after photocatalytic oxidation. Those groups of compounds did not seem to contribute significantly to the formation of trihalomethanes.
采用紫外-可见分光光度法、多波长紫外检测器的高效体积排除色谱（HPSEC）、液相色谱-有机碳检测器（LC-OCD）和三卤甲烷生成潜能（THMFP）分析，定量研究了 TiO2 光催化氧化对澳大利亚两种地表水中天然有机物（NOM）性质的影响。尽管无法实现 NOM 的完全矿化，但处理后，波长大于 250nm 的紫外吸光度和溶解有机碳（DOC）含量均显著降低。HPSEC 分析的多波长紫外检测结果表明，NOM 组成和分子量分布发生了进一步的变化，因为有机分子转化为在典型检测波长 250-260nm 处吸收较弱的化合物。多波长 HPSEC 结果还表明，光催化氧化生成了低芳香度和低分子量的副产物。LC-OCD 色谱图表明，光催化氧化后仍存在低分子酸和中性化合物。这些化合物似乎并未对三卤甲烷的形成产生显著影响。
