Oxidation of municipal wastewater by free radicals mechanism. A UV/Vis spectroscopy study

E. Giannakopoulos, E. Isari, K. Bourikas, H. K. Karapanagioti, G. Psarras, G. Oron, I. K. Kalavrouziotis

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    18 Scopus citations

    Abstract

    This study investigates the oxidation of municipal wastewater (WW) by complexation with natural polyphenols having radical scavenging activity, such as (3,4,5 tri-hydroxy-benzoic acid) gallic acid (GA) in alkaline pH (>7), under ambient O2 and temperature. Physicochemical and structural characteristics of GA-WW complex-forming are evaluated by UV/Vis spectroscopy. The comparative analysis among UV/Vis spectra of GA monomer, GA-GA polymer, WW compounds, and GA-WW complex reveals significant differences within 350–450 and 500–900 nm. According to attenuated total reflectance (ATR) spectroscopy and thermogravimetric analysis (TGA), these spectra differences correspond to distinct complexes formed. This study suggests a novel role of natural polyphenols on the degradation and humification of wastes.

    Original languageEnglish
    Pages (from-to)186-194
    Number of pages9
    JournalJournal of Environmental Management
    Volume195
    DOIs
    StatePublished - 15 Jun 2017

    Keywords

    • Complexation
    • Free radicals
    • Municipal wastewater
    • Oxidation
    • Polyphenols

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