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. Author manuscript; available in PMC: 2022 Jan 1.
Published in final edited form as: Chem Eng J. 2020 Jul 19;403:126278. doi: 10.1016/j.cej.2020.126278

Fig. 2.

Fig. 2.

Electro/sulfite process generated sulfate radical, as (a) visualized in electron spin resonance assay and (b) demonstrated by benzoic acid removals. Conditions: 5 μM benzoic acid, 1 mM sulfite, 10 mM Na2SO4, 10 mM phosphate buffer at pH 7, 200 mA.