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- W2017112192 abstract "Photocatalytic oxidation (PCO) using illuminated TiO2 was employed as a treatment procedure for Cu(II)−EDTA; heavy metal-chelates pose unique challenges for treatment and removal processes. The appearance and concentration of reaction products and intermediates were determined with variation of pH from 4 to 7 at 10-4 M Cu(II)−EDTA. From the mineralization of the EDTA (ethylenediaminetetraacetic acid), CO2 and NH4+ were formed as the major carbon and nitrogen species, respectively. Formaldehyde, formate, acetate, oxalate, and nitrate were minor products. Low concentrations of Cu(II)−IDA (iminodiacetic acid) were found at pH 7 only. The production ratio of CO2 to formaldehyde ranged from 4:1 to 10:1. A closed carbon mass balance was obtained with CO2, dissolved organic carbon, and adsorbed organic carbon during PCO. Lack of nitrogen recovery from total Kjeldahl nitrogen (TKN) and NO3- measurements suggests the production of gaseous nitrogen compounds. It is proposed that PCO reactions are initiated at either a carboxyl or amine group, depending on pH and whether the Cu(II)−EDTA is adsorbed or in solution. At lower pH, the PCO reaction proceeded favorably via radical formation at a carboxyl group complexed to the TiO2 surface. Production of Cu(II)−IDA and oxalate only at pH 7 suggests some contribution from reaction at an amine group at neutral pH." @default.
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- W2017112192 date "2000-08-04" @default.
- W2017112192 modified "2023-09-27" @default.
- W2017112192 title "Photocatalytic Oxidation of Cu(II)−EDTA with Illuminated TiO<sub>2</sub>: Mechanisms" @default.
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- W2017112192 doi "https://doi.org/10.1021/es990875h" @default.
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