Rapid removal of acesulfame potassium by acid-activated ferrate(VI) under mild alkaline conditions
| Autor: | Kyriakos Manoli, George Nakhla, Virender K. Sharma, Justin B. Renaud, Malini Ghosh, Ajay K. Ray, Lyne Sabourin |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
Time Factors Potassium ferrate Potassium Compounds Surface Properties Health Toxicology and Mutagenesis 0208 environmental biotechnology Acesulfame potassium Thiazines 02 engineering and technology 010501 environmental sciences Wastewater 01 natural sciences Water Purification Hydrolysis chemistry.chemical_compound Sulfamic acid Environmental Chemistry Reactivity (chemistry) Organic matter Humic Substances 0105 earth and related environmental sciences chemistry.chemical_classification Public Health Environmental and Occupational Health General Medicine General Chemistry Hydrogen-Ion Concentration Pollution 6. Clean water 020801 environmental engineering chemistry Ferrate(VI) Oxidation-Reduction Iron Compounds Water Pollutants Chemical Nuclear chemistry |
| Zdroj: | Chemosphere. 230 |
| ISSN: | 1879-1298 |
| Popis: | Acesulfame potassium (ACE) is a widely used artificial sweetener that has consistently been detected in wastewater and surface waters. The high-valent iron-based green oxidant known as ferrate(VI) (potassium ferrate(VI); Fe(VI)) had low reactivity with ACE (i.e. 4 h (or 240 min) contact time removed only ∼ 67% ACE) at a molar ratio of 6.0 ([Fe(VI)]:[ACE]). Comparatively, it took 60 s (or 1 min) to remove ∼94% ACE when HCl (786 μM) was added to a mixture of Fe(VI)-ACE at the same molar ratio of 6.0 (or acid-activated Fe(VI)). Significantly, the final pH (i.e. 7.6–8.1) was similar for Fe(VI) and acid-activated Fe(VI). An empirical model using response surface methodology was developed that could describe reasonably well the removal efficiency of ACE. Inorganic constituents of wastewater (Cl−, Na+, Ca2+, and Mg2+) had no significant effect on the oxidation of ACE by acid-activated Fe(VI). The degradation efficiency of ACE decreased in the presence of 10 mg/L of natural organic matter (NOM) but remained unchanged at 5 mg NOM/L. Sulfamic acid as the oxidized product of ACE was identified by liquid chromatography high resolution mass spectrometry method. Reaction pathways include ring opening of ACE through hydrolytic transformation. Acid-activated Fe(VI) has advantage of rapid removal of ACE under mild alkaline conditions of wastewater treatment plants compared to other oxidation processes such as chlorination, ozonation, and light-based processes. |
| Databáze: | OpenAIRE |
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