title: Oxidation of municipal wastewater by free radicals mechanism. A UV/Vis spectroscopy study.
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 O2and 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.
authors: School of Science and Technology, Hellenic Open University, Tsamadou 13-15 & Saint Andrea, 262 22, Patras, Greece.
authors: E
authors: E
authors: Giannakopoulos
authors: School of Science and Technology, Hellenic Open University, Tsamadou 13-15 & Saint Andrea, 262 22, Patras, Greece.
authors: E
authors: E
authors: Isari
authors: School of Science and Technology, Hellenic Open University, Tsamadou 13-15 & Saint Andrea, 262 22, Patras, Greece.
authors: K
authors: K
authors: Bourikas
authors: Department of Chemistry, University of Patras, Patras, 26504, Greece.
authors: H K
authors: HK
authors: Karapanagioti
authors: Hellenic Agricultural Organization-"DIMITRA"-Institute for Olive Tree, Subtropical Crops and Viticulture, Lab. of Plant Mineral Nutrition & Physiology, Chania, 73 100, Greece.
authors: G
authors: G
authors: Psarras
authors: Ben-Gurion University of the Negev, J. Blaustein Institutes for Desert Research, Zuckerberg Water Research Center, Kiryat Sde Boker, 8499000, Israel.
authors: G
authors: G
authors: Oron
authors: School of Science and Technology, Hellenic Open University, Tsamadou 13-15 & Saint Andrea, 262 22, Patras, Greece. Electronic address: ikalabro@eap.gr.
authors: I K
authors: IK
authors: Kalavrouziotis
mesh_terms: D005609:Free Radicals / Q000737:chemistry*; D005707:Gallic Acid; D010084:Oxidation-Reduction; D013057:Spectrum Analysis; D062065:Wastewater
chemical_list: D005609:Free Radicals; D005707:Gallic Acid; D062065:Wastewater
keywords: Complexation; Free radicals; Municipal wastewater; Oxidation; Polyphenols