Tags

Type your tag names separated by a space and hit enter

Comparative studies in electrochemical degradation of sulfamethoxazole and diclofenac in water by using various electrodes and phosphate and sulfate supporting electrolytes.

Abstract

In this study, the electro-oxidation capacities of Na2SO4 and potassium phosphate buffer supporting electrolytes were tested and compared for destruction of the sulfamethoxazole (SMX) and diclofenac (DCF) on platinum (Pt) electrode and graphite carbon electrode in aqueous medium. The suitability of pharmaceutical active compounds (PhACs) for electrochemical oxidation was tested by cyclic voltammetry (CV) technique performed in the potential range -1.5 to +1.5 V versus Ag/AgCl, which confirmed the electro-activity of the selected PhACs. The degradation and mineralization were monitored by ultraviolet (UV)-Vis spectrophotometry and HPLC. 0.1 M Na2SO4 supporting electrolyte was found to be more effective for mineralization of SMX and DCF, with efficiency of 15-30% more than the 0.1 M phosphate buffer supporting electrolyte on the platinum (Pt) and carbon electrodes. The Pt electrode showed better performance in the degradation of the two PhACs while under the same conditions than the carbon electrode for both 0.1 M Na2SO4 and 0.1 M potassium phosphate buffer supporting electrolytes. The SMX and DCF degradation kinetics best fitted the second-order reaction, with rate constants ranging between 0.000389 and 0.006 mol(2) L(-2) min(-1) and correlation coefficient (R(2)) above 0.987. The second-order degradation kinetics indicated that the rate-determining step in the degradation could be a chemical process, thus suggesting the active involvement of electrolyte radical species in the degradation of SMX and DCF. Results obtained from a real field sample showed a more than 98% removal of the PhACs from the wastewater by electrochemical degradation.

Authors+Show Affiliations

a Department of Pure and Applied Chemistry , Masinde Muliro University of Science and Technology , Kakamega , Kenya.a Department of Pure and Applied Chemistry , Masinde Muliro University of Science and Technology , Kakamega , Kenya.b Department of Physical Sciences , Machakos University College , Machakos , Kenya.a Department of Pure and Applied Chemistry , Masinde Muliro University of Science and Technology , Kakamega , Kenya.

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

27337050

Citation

Sifuna, Fred W., et al. "Comparative Studies in Electrochemical Degradation of Sulfamethoxazole and Diclofenac in Water By Using Various Electrodes and Phosphate and Sulfate Supporting Electrolytes." Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, vol. 51, no. 11, 2016, pp. 954-61.
Sifuna FW, Orata F, Okello V, et al. Comparative studies in electrochemical degradation of sulfamethoxazole and diclofenac in water by using various electrodes and phosphate and sulfate supporting electrolytes. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2016;51(11):954-61.
Sifuna, F. W., Orata, F., Okello, V., & Jemutai-Kimosop, S. (2016). Comparative studies in electrochemical degradation of sulfamethoxazole and diclofenac in water by using various electrodes and phosphate and sulfate supporting electrolytes. Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering, 51(11), 954-61. https://doi.org/10.1080/10934529.2016.1191814
Sifuna FW, et al. Comparative Studies in Electrochemical Degradation of Sulfamethoxazole and Diclofenac in Water By Using Various Electrodes and Phosphate and Sulfate Supporting Electrolytes. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2016 Sep 18;51(11):954-61. PubMed PMID: 27337050.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparative studies in electrochemical degradation of sulfamethoxazole and diclofenac in water by using various electrodes and phosphate and sulfate supporting electrolytes. AU - Sifuna,Fred W, AU - Orata,Francis, AU - Okello,Veronica, AU - Jemutai-Kimosop,Selly, Y1 - 2016/06/23/ PY - 2016/6/24/entrez PY - 2016/6/24/pubmed PY - 2017/3/16/medline KW - Electrochemical degradation KW - Na2SO4 KW - diclofenac KW - graphite carbon KW - platinum plate KW - pollutant KW - potassium phosphate buffer KW - sulfamethoxazole KW - supporting electrolytes SP - 954 EP - 61 JF - Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering JO - J Environ Sci Health A Tox Hazard Subst Environ Eng VL - 51 IS - 11 N2 - In this study, the electro-oxidation capacities of Na2SO4 and potassium phosphate buffer supporting electrolytes were tested and compared for destruction of the sulfamethoxazole (SMX) and diclofenac (DCF) on platinum (Pt) electrode and graphite carbon electrode in aqueous medium. The suitability of pharmaceutical active compounds (PhACs) for electrochemical oxidation was tested by cyclic voltammetry (CV) technique performed in the potential range -1.5 to +1.5 V versus Ag/AgCl, which confirmed the electro-activity of the selected PhACs. The degradation and mineralization were monitored by ultraviolet (UV)-Vis spectrophotometry and HPLC. 0.1 M Na2SO4 supporting electrolyte was found to be more effective for mineralization of SMX and DCF, with efficiency of 15-30% more than the 0.1 M phosphate buffer supporting electrolyte on the platinum (Pt) and carbon electrodes. The Pt electrode showed better performance in the degradation of the two PhACs while under the same conditions than the carbon electrode for both 0.1 M Na2SO4 and 0.1 M potassium phosphate buffer supporting electrolytes. The SMX and DCF degradation kinetics best fitted the second-order reaction, with rate constants ranging between 0.000389 and 0.006 mol(2) L(-2) min(-1) and correlation coefficient (R(2)) above 0.987. The second-order degradation kinetics indicated that the rate-determining step in the degradation could be a chemical process, thus suggesting the active involvement of electrolyte radical species in the degradation of SMX and DCF. Results obtained from a real field sample showed a more than 98% removal of the PhACs from the wastewater by electrochemical degradation. SN - 1532-4117 UR - https://www.unboundmedicine.com/medline/citation/27337050/Comparative_studies_in_electrochemical_degradation_of_sulfamethoxazole_and_diclofenac_in_water_by_using_various_electrodes_and_phosphate_and_sulfate_supporting_electrolytes_ L2 - http://www.tandfonline.com/doi/full/10.1080/10934529.2016.1191814 DB - PRIME DP - Unbound Medicine ER -