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Rapid removal of acesulfame potassium by acid-activated ferrate(VI) under mild alkaline conditions.
Chemosphere. 2019 Sep; 230:416-423.C

Abstract

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.

Authors+Show Affiliations

Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A5B9, Canada.Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A5B9, Canada.Agriculture and Agri-Food Canada, London Research and Development Centre, London, ON, N5V4T3, Canada.Agriculture and Agri-Food Canada, London Research and Development Centre, London, ON, N5V4T3, Canada.Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A5B9, Canada.Program for the Environment and Sustainability, Department of Environmental and Occupational Health, School of Public Health, Texas A&M University, 1266 TAMU, College Station, TX, 77843, United States. Electronic address: vsharma@sph.tamhsc.edu.Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A5B9, Canada. Electronic address: aray@eng.uwo.ca.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31112864

Citation

Ghosh, Malini, et al. "Rapid Removal of Acesulfame Potassium By Acid-activated ferrate(VI) Under Mild Alkaline Conditions." Chemosphere, vol. 230, 2019, pp. 416-423.
Ghosh M, Manoli K, Renaud JB, et al. Rapid removal of acesulfame potassium by acid-activated ferrate(VI) under mild alkaline conditions. Chemosphere. 2019;230:416-423.
Ghosh, M., Manoli, K., Renaud, J. B., Sabourin, L., Nakhla, G., Sharma, V. K., & Ray, A. K. (2019). Rapid removal of acesulfame potassium by acid-activated ferrate(VI) under mild alkaline conditions. Chemosphere, 230, 416-423. https://doi.org/10.1016/j.chemosphere.2019.05.069
Ghosh M, et al. Rapid Removal of Acesulfame Potassium By Acid-activated ferrate(VI) Under Mild Alkaline Conditions. Chemosphere. 2019;230:416-423. PubMed PMID: 31112864.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Rapid removal of acesulfame potassium by acid-activated ferrate(VI) under mild alkaline conditions. AU - Ghosh,Malini, AU - Manoli,Kyriakos, AU - Renaud,Justin B, AU - Sabourin,Lyne, AU - Nakhla,George, AU - Sharma,Virender K, AU - Ray,Ajay K, Y1 - 2019/05/14/ PY - 2019/03/13/received PY - 2019/05/07/revised PY - 2019/05/09/accepted PY - 2019/5/22/pubmed PY - 2019/8/2/medline PY - 2019/5/22/entrez KW - Activation KW - Artificial sweetener KW - Enhanced oxidation KW - Ferrate(VI) KW - Ions KW - Organic matter SP - 416 EP - 423 JF - Chemosphere JO - Chemosphere VL - 230 N2 - 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. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/31112864/Rapid_removal_of_acesulfame_potassium_by_acid_activated_ferrate_VI__under_mild_alkaline_conditions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(19)30973-7 DB - PRIME DP - Unbound Medicine ER -