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. Author manuscript; available in PMC: 2020 Sep 15.
Published in final edited form as: Appl Energy. 2019 May 14;250:1011–1022. doi: 10.1016/j.apenergy.2019.05.108

Fig. 4.

Fig. 4.

Changes of (a,b) dissolved oxygen, (c,d) dissolved Fe(III), (e,f) sulfite concentration, and (g,h) ibuprofen concentration in Fe(II)/sulfite, oxygenated Fe(II)/sulfite, and electro/Fe(II)/sulfite processes at pH 4 or pH 7. Conditions: Fe(II)/sulfite – 10 μM ibuprofen, 0.1 mM Fe(II), 1 mM sulfite, 10 mM Na2SO4; oxygenated Fe(II)/sulfite – 10 μM ibuprofen, 0.1 mM Fe(II), 1 mM sulfite, 10 mM Na2SO4, 1 L/min oxygenation; electro/Fe(II)/sulfite – 10 μM ibuprofen, 0.1 mM Fe(II), 1 mM sulfite, 10 mM Na2SO4, 200 mA.