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Improvement of the photocatalytic activity of magnetite by Mn-incorporation

机译：掺锰改善磁铁矿的光催化活性

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Mn-incorporated Fe_3O_4 photocatalysts were prepared by a simple co-precipitation method. Photocatalytic discoloration of Methylene Blue (MB) was used to evaluate the performance of these catalysts. The DSC results have shown that the insertion of Mn into Fe_3O_4 lattice has increased converting Fe_3O_4 to γ-Fe_3O_4. This is accompanied by a decrease of surface area and of crystallinity, as detected by XRD. The analysis of the chemical environment by XPS has shown that Mn~(2+) replaces Fe~(2+) preferentially in the octahedral sites while Mn~(3+) replaces Fe~(3+) of inverse spinel sites. The Mn-incorporated samples were significantly more efficient in MB discoloration assisted by UVA irradiation and H_2O_2. It was also found that ascorbic acid prevents H_2O_2 decomposition, by scavenging preferentially ·OOH radicals produced at Mn sites. Finally, the results reported here can contribute for a better comprehension of the activity of composite catalysts and the design of efficient systems for discoloration of organic pollutants.
机译：采用简单的共沉淀法制备了掺Mn的Fe_3O_4光催化剂。亚甲基蓝（MB）的光催化脱色用于评估这些催化剂的性能。 DSC结果表明，Mn向Fe_3O_4晶格中的插入增加了将Fe_3O_4转化为γ-Fe_3O_4的能力。如通过XRD检测到的，这伴随着表面积和结晶度的减少。 XPS对化学环境的分析表明，Mn〜（2+）优先取代八面体位的Fe〜（2+），而Mn〜（3+）取代尖晶石位点的Fe〜（3+）。通过UVA照射和H_2O_2辅助，掺入Mn的样品在MB褪色方面效率更高。还发现抗坏血酸通过优先清除在Mn位点产生的·OOH自由基来防止H_2O_2分解。最后，此处报道的结果可有助于更好地理解复合催化剂的活性以及设计有效的有机污染物脱色系统。

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