Fluorescence Excitation-Emission Spectroscopy for Characterizing Transformation of Dissolved Organic Matter during Landfill Leachate Treatment by Photocatalysis

Abstract:

Fluorescence spectroscopy was performed to investigate the composition changes and characteristics of the leachate DOM (dissolved organic matter) during UV-TiO₂ photocatalytic treatment process. The results showed that fulvic-like, tryptophan-like and humic acids-like matters were the main compounds in leachate. During photocatalytic treatment process, fluorescence spectroscopy of DOM changed considerably. The final products were mainly fulvic-like and tryptophan-like matters. In general, the fluorescence signals of humic acids-like matters had the most significant change, which disappeared entirely after 60 h treatment, implying that humic acids-like matters can be degraded preferentially by photocatalysis. The other notable change was in VIS fulvic-like matters region, which suggested that fulvic-like matters can be significantly degraded. In 72 h photocatalytic effluent, VIS fulvic-like, tryptophan-like and tyrosine-like matters were remained, and the last two matters were the dominant fractions. These results indicated that fulvic-like and humic acids-like matters with macromolecular can be degraded into protein-like matters with micro-molecular by photocatalysis.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 122-126
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.122
• Online since: August 2013
• Authors: Chu Zhou Deng, Song Liu, Chen Zhong Jia
• Keywords: Dissolved Organic Matter, Fluorescence Spectroscopy, Landfill Leachate, Photocatalysis

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