Evaluation of natural organic matter changes from Lake Hohloh by three-dimensional excitation-emission matrix fluorescence spectroscopy during TiO2/UV process

被引:72
|
作者
Valencia, Sergio [1 ]
Marin, Juan M. [1 ]
Restrepo, Gloria [1 ]
Frimmel, Fritz H. [2 ]
机构
[1] Univ Antioquia, SIU UdeA, Fac Ingn, Grp Proc Fisicoquim Aplicados, Medellin, Colombia
[2] KIT, Engler Bunte Inst, Bereich Wasserchem, D-7631 Karlsruhe, Germany
关键词
Natural organic matter; Heterogeneous photocatalysis; Fluorescence spectroscopy; Excitation-emission matrix; SIZE-EXCLUSION CHROMATOGRAPHY; DISINFECTION BY-PRODUCTS; DRINKING-WATER; PHOTOCATALYTIC DEGRADATION; ADVANCED OXIDATION; HUMIC ACIDS; STABILITY-CONSTANTS; CHLORINE; REMOVAL; DOM;
D O I
10.1016/j.watres.2013.12.019
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study shows the changes of natural organic matter (NOM) from Lake Hohloh, (Black Forest, Germany) during heterogeneous photocatalysis with TiO2 (TiO2/UV). The effect of pH on the adsorption of NOM onto TiO2 in the dark and TiO2/UV degradation of NOM was followed using three-dimensional excitation emission matrix (EEM) fluorescence. At pH values between 4 and 9, the NOM was adsorbed onto TiO2 in the dark with a greater decrease in the fluorescence intensity and in the spectral shapes, especially under acidic pH conditions. However, at pH = 10 there was not adsorption on NOM which led to a negligible changes the fluorescence intensity. A significant high linear correlation was observed between the DOC adsorption onto TiO2 and the maximum fluorescence intensity. Additionally, the NOM adsorption onto TiO2 and its TiO2/UV degradation shifted the fluorescence maxima toward shorter wavelengths in the EEM contour plots, with a decrease in aromaticity. These changes were accompanied by a substantial decrease in the organically bound halogens adsorbable on activated carbon (AOXFP) and the trihalomethane formation potential (THMFP). Thus, the decrease in maximum fluorescence intensity can be used as an indicator of AOXFP and TTHMFP removal efficiency. Therefore, fluorescence spectroscopy is a robust analytical technique for evaluate TiO2/UV removal of NOM. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:124 / 133
页数:10
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