The constraints of transition metal substitutions (Ti, Cr, Mn, Co and Ni) in magnetite on its catalytic activity in heterogeneous Fenton and UV/Fenton reaction: From the perspective of hydroxyl radical generation

• The
• OH radicals in Fenton and UV/Fenton processes were analyzed quantitatively.
• The substitutions affected the catalytic activity of magnetite in
• OH generation.
• Cr substituted magnetite displayed the best catalytic activity in
• OH generation.
• The relationship between
• OH generation and pollutant degradation was discussed.
• Multivariate analyses were carried out to interpret the main influence factors.

In this paper, the heterogeneous Fenton and UV/Fenton catalytic activities of transition metal substituted magnetites, Fe3−xMxO4 (M = Ti, Cr, Mn, Co and Ni), were compared in the perspective of
• OH radicals generation. In heterogeneous Fenton reaction, the substitutions of Cr(III), Mn(II) and Co(II) enhanced the rate of
• OH formation, while Ni(II) and Ti(VI) showed the negative effect. In heterogeneous UV/Fenton reaction, the Ni(II) and Co(II) introduction did not show notable changes on
• OH generation efficiency, whetreas the Cr(III), Ti(VI) and Mn(II) incorporation improved this reaction and accordingly enhanced the UV/Fenton catalytic activity of magnetite. Redundancy and Pearson correlation analyses were carried out to interpret the influence factors in Fenton and UV/Fenton reactions.

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