Electrochemical incineration of the antibiotic ciprofloxacin in sulfate medium and synthetic urine matrix
| Autor: | Sergi Garcia-Segura, Enric Brillas, V. S. Antonin, Mauro C. Santos |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Radical Inorganic chemistry Ion chromatography Incineration Urine Inorganic ions Electrochemistry Mass Spectrometry law.invention chemistry.chemical_compound Ciprofloxacin law Waste Management and Disposal Chromatography High Pressure Liquid Water Science and Technology Civil and Structural Engineering Electrolysis Photolysis Sulfates Chemistry Ecological Modeling Electrochemical Techniques Mineralization (soil science) Chromatography Ion Exchange Pollution Anti-Bacterial Agents Anode Urea Oxidation-Reduction Water Pollutants Chemical Chromatography Liquid |
| Zdroj: | Water Research. 83:31-41 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2015.05.066 |
| Popis: | The degradation of 100 mL of 0.245 mM of the antibiotic ciprofloxacin in 0.05 M Na 2 SO 4 at pH 3.0 has been studied by electrochemical oxidation with electrogenerated H 2 O 2 (EO-H 2 O 2 ), electro-Fenton (EF), UVA photoelectro-Fenton (PEF) and solar PEF (SPEF). Electrolyses were performed with a stirred tank reactor using either a boron-doped diamond (BDD) or Pt anode and an air-diffusion cathode. In EF, PEF and SPEF, ciprofloxacin was rapidly removed due to its oxidation with • OH formed from Fenton's reaction between added Fe 2+ and H 2 O 2 generated at the cathode. The larger electrochemical incineration of the antibiotic was achieved by SPEF with BDD with 95% mineralization thanks to the additional attack by hydroxyl radicals formed from water oxidation at the BDD anode surface and the photolysis of final Fe(III)-oxalate and Fe(III)-oxamate species from sunlight. Up to 10 primary intermediates and 11 hydroxylated derivatives were identified by LC-MS, allowing the proposal of a reaction sequence for ciprofloxacin mineralization. A different behavior was found when the same antibiotic concentration was oxidized in a synthetic urine matrix with high urea content and a mixture of PO 4 3 − , SO 4 2 − and Cl − ions. Since Fenton's reaction was inhibited in this medium, only EO and EO-H 2 O 2 processes were useful for mineralization, being the organics mainly degraded by HClO formed from Cl − oxidation. The EO process with a BDD/stainless steel cell was found to be the most powerful treatment for the urine solution, yielding 96% ciprofloxacin removal and 98% mineralization after 360 min of electrolysis at optimum values of pH 3.0 and current density of 66.6 mA cm −2 . The evolution of released inorganic ions was followed by ion chromatography. |
| Databáze: | OpenAIRE |
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