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



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



Journal of Environmental Management 195(Pt 2): 186-194



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.

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Accession: 058488310

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PMID: 27492877

DOI: 10.1016/j.jenvman.2016.07.055


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