Preparation and characterization of composite magnetic catalyst β-MnO2/MnxZn1-xFe2O4
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摘要: 采用化学共沉淀法制备了以MnxZn1-x Fe2O4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2 mL含量为30%的H2O2作用下,1 h内β-MnO2/MnxZn1-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/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%。
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关键词:
- 复合磁性催化剂 /
- MnO2 /
- MnxZn1-xFe2O4 /
- 化学共沉淀法 /
- 罗丹明
Abstract: The β-MnO2/MnxZn1-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/MnxZn1-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 MnxZn1-xFe2O4 are successfully combined together. The β-MnO2/MnxZn1-xFe2O4 composite magnetic catalyst has good catalytic and magnetic properties. When the mass ratio of MnxZn1-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/MnxZn1-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/MnxZn1-xFe2O4 composite magnetic catalyst is 89%, and the degradation rate of RhB is 76% after five cycles.-
Key words:
- composite magnetic catalyst /
- MnO2 /
- MnxZn1-xFe2O4 /
- chemical co-precipitation method /
- Rhodamine B
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