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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. 5.

Fig. 5.

Comparisons of benzoic acid degradation in terms of (a) kinetics and (b) removals after reaction for 30 min by electro/UV/sulfite and metal/sulfite processes. Conditions: electro/UV/sulfite process − 5 μM benzoic acid, 1 mM sulfite, 10 mM Na2SO4, 200 mA, UV; metal/sulfite processes − 5 μM benzoic acid, 1 mM sulfite, 0.1 mM metal ions (i.e., Cu(II), Co(II), Fe(II), or Mn(II)). Reactions were carried out in 10 mM MOPS buffer at pH 7.