复合磁性催化剂β-MnO2/MnxZn1-xFe2O4的制备与表征

采用化学共沉淀法制备了以Mn_xZn_1-x Fe₂O₄为磁性基体的β-MnO₂/Mn_xZn_1-xFe₂O₄复合磁性催化剂，利用XRD、SEM、FTIR和超导量子干涉仪对复合磁性催化剂的结构和性能进行了表征，以罗丹明B （RhB）为模拟污染物，研究了β-MnO₂/Mn_xZn_1-xFe₂O₄的催化活性，并考察了其稳定性。结果表明，球状的β-MnO₂与块状的磁性基体Mn_xZn_1-xFe₂O₄成功复合，且制备的β-MnO₂/Mn_xZn_1-xFe₂O₄复合磁性催化剂具有良好的催化性能和磁学性能。当Mn_xZn_1-xFe₂O₄与β-MnO₂的质量比为20：100时，在2 mL含量为30%的H₂O₂作用下，1 h内β-MnO₂/Mn_xZn_1-xFe₂O₄复合磁性催化剂对100 mL浓度为10 mg/L的RhB降解率（93.9%）远高于纯β-MnO₂（33.7%）；在磁场作用下，β-MnO₂/Mn_xZn_1-xFe₂O₄复合磁性催化剂的回收率为89%，经过5次循环利用之后其对RhB的降解率仍达76%。

Preparation and characterization of composite magnetic catalyst β-MnO2/MnxZn1-xFe2O4

The β-MnO₂/Mn_xZn_1-xFe₂O₄ composite magnetic catalyst was synthesized via chemical co-precipitation method, and the structure and performance of the composite were characterized by XRD, SEM, FTIR and superconducting quantum interference device (SQUID). The catalytic activity of β-MnO₂/Mn_xZn_1-xFe₂O₄ was studied by using Rhodamine B (RhB) as a simulated pollutant, and its stability was also studied. The results show that the spherical β-MnO₂ and magnetic substrates Mn_xZn_1-xFe₂O₄ are successfully combined together. The β-MnO₂/Mn_xZn_1-xFe₂O₄ composite magnetic catalyst has good catalytic and magnetic properties. When the mass ratio of Mn_xZn_1-xFe₂O₄ and β-MnO₂ is 20:100, in the presence of 2 mL of H₂O₂ (30%), the degradation rate of RhB at a concentration of 10 mg/L (100 mL) in β-MnO₂/Mn_xZn_1-xFe₂O₄ composite magnetic catalyst (93.9%) is higher than that in pure β-MnO₂ (33.7%) within 1 h. Under the magnetic field, the recovery rate of the β-MnO₂/Mn_xZn_1-xFe₂O₄ composite magnetic catalyst is 89%, and the degradation rate of RhB is 76% after five cycles.