Fluorescence spectroscopic characterization of DOM fractions isolated from a filtered river water after ozonation and catalytic ozonation

Chemosphere
Tao ZhangZhimin Qiang

Abstract

Fluorescence spectra were applied to investigate the structural changes of four dominant dissolved natural organic matter (DOM) fractions of a filtered river water before and after ozonation and catalytic ozonation. The ozonation and catalytic ozonation with synthetic goethite (FeOOH) and cerium dioxide (CeO(2)) were carried out under normal conditions, i.e. pH 7, reaction time of 10 min, and ozone/DOC ratio of about 1. The fluorescence spectra were recorded at both excitation-emission matrix (EEM) and synchronous scanning modes. EEM results reveal that ozonation of these DOM fractions causes a significant decrease of the aromaticity of humic-like structures and an increase of electron withdrawing groups, e.g., carboxylic groups. The catalysts can further improve the destruction of the humic-like structures in catalytic ozonation. Synchronous spectra reveal that ozonation of hydrophobic acid and hydrophilic acid (HIA) yields a significant amount of by-products with low aromaticity and low molecular weight. Catalytic ozonation enhances substantially the formation of these by-products from HIA and improves the destruction of highly polycyclic aromatic structures for all examined DOM fractions.

References

Mar 1, 1978·Analytical Chemistry·T Vo-Dinh

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Citations

Jun 13, 2014·Environmental Science and Pollution Research International·D BallaD Voutsa
Sep 12, 2014·International Journal of Environmental Research and Public Health·Yu-Hsiang Wang, Kuan-Chung Chen
Sep 25, 2015·Environmental Science and Pollution Research International·A PapageorgiouD Voutsa
May 17, 2011·Water Research·Steven Van GeluweBart Van der Bruggen
Oct 5, 2015·The Science of the Total Environment·Francisco J RodríguezMaría García-Valverde
Jun 29, 2017·Environmental Science and Pollution Research International·Stylianos K StylianouAnastasios I Zouboulis
Oct 27, 2021·The Science of the Total Environment·Shengyang LianYuanyuan Qu

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