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采用化学共沉淀法制备了以MnxZn1-xFe2O4为磁性基体的β-MnO2/MnxZn1-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/MnxZn1-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MnxZn1-xFe2O4成功复合,且制备的β-MnO2/MnxZn1-xFe2O4复合磁性催化剂具有良好的催化性能和磁学性能。当MnxZn1-xFe2O4与β-MnO2的质量比为20:100时,在2mL含量为30%的H2O2作用下,1h内β-MnO2/MnxZn1-xFe2O4复合磁性催化剂对100mL浓度为10mg/L的RhB降解率(93.9%)远高于纯β-MnO2(33.7%);在磁场作用下,β-MnO2/MnxZn1-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%。
The composite magnetic catalyst with MnxZn1-xFe2O4 as magnetic matrix was prepared by chemical coprecipitation. The structure and properties of the composite magnetic catalyst were characterized by XRD, SEM, FTIR and superconducting quantum interference. The catalytic activity of β-MnO2 / MnxZn1-xFe2O4 was studied with rhodamine B (RhB) as a simulated pollutant, and its stability was also investigated. The results show that the spherical β-MnO2 and the bulk magnetic MnxZn1-xFe2O4 composite successfully compound, and the prepared β-MnO2 / MnxZn1-xFe2O4 composite magnetic catalyst has good catalytic performance and magnetic properties. When the mass ratio of MnxZn1-xFe2O4 to β-MnO2 was 20:100, 100mL of RhB with concentration of 10mg / L was degraded by β-MnO2 / MnxZn1-xFe2O4 composite magnetic catalyst within 1h with 2mL H2O2 concentration of 30% The recovery rate of β-MnO2 / MnxZn1-xFe2O4 composite magnetic catalyst was 89% under the action of magnetic field, and the rate of 93.9% was much higher than pure β-MnO2 (33.7% The rate is still up 76%.