Enhanced degradation of metronidazole by sunlight via photo-Fenton process under gradual addition of hydrogen peroxide
Autor: | Ridha Abdelhedi, Hafedh Belhadj Ammar, Mabrouk Ben Brahim, Youssef Samet |
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Rok vydání: | 2016 |
Předmět: |
chemistry.chemical_classification
Process Chemistry and Technology Inorganic chemistry Kinetics Chemical oxygen demand Advanced oxidation process 02 engineering and technology Mineralization (soil science) 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Absorbance chemistry.chemical_compound chemistry Organic matter Physical and Theoretical Chemistry 0210 nano-technology Hydrogen peroxide 0105 earth and related environmental sciences |
Zdroj: | Journal of Molecular Catalysis A: Chemical. 420:222-227 |
ISSN: | 1381-1169 |
Popis: | The present paper has investigated the application of solar energy as renewable, abundant, free and clean energy driven advanced oxidation process (photo-Fenton), for the mineralization of metronidazole (MTZ) as the most important drug of the group of 5-nitroimidazole. The hydrogen peroxide (H 2 O 2 ) was added slowly and gradually over time in order to limit side reactions. The kinetics of organic matter decay was monitored by the chemical oxygen demand (COD) and the absorbance measurements. The experimental results showed that the solar photo-Fenton system leads successfully to 96% of COD removal for 960 mg L −1 COD 0 under optimal experimental conditions (1 mmol L −1 Fe(II) 0 , H 2 O 2 dosing rate of 2 mmol min −1 , pH 3 and at 60 °C) after 12 min. The MTZ concentration decay and the COD removal obeyed a pseudo-first-order kinetics. Compared with Fenton process, the exposition of the reactor to sunlight enhanced the mineralization process by 16%. |
Databáze: | OpenAIRE |
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