| Summary: | The MnFe<sub>2</sub>O<sub>4</sub>/BGA (boron-doped graphene aerogel) composite was prepared by hydrothermal treatment of MnFe<sub>2</sub>O<sub>4</sub> particles, boric acid, and graphene oxide. When applied as a photo-Fenton catalyst for the degradation of rhodamine B, the MnFe<sub>2</sub>O<sub>4</sub>/BGA composite yielded a degradation efficiency much higher than the sum of those of individual MnFe<sub>2</sub>O<sub>4</sub> and BGA under identical experimental conditions, indicating a strong synergetic effect established between MnFe<sub>2</sub>O<sub>4</sub> and BGA. The catalytic degradation of rhodamine B was proved to follow pseudo first-order kinetics, and the apparent reaction rate constant on the MnFe<sub>2</sub>O<sub>4</sub>/BGA composite was calculated to be three- and seven-fold that on BGA and MnFe<sub>2</sub>O<sub>4</sub>, respectively. Moreover, the MnFe<sub>2</sub>O<sub>4</sub>/BGA composite also demonstrated good reusability and could be reused for four cycles without obvious loss of photocatalytic activity.
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