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- 2018
复合磁性催化剂β-MnO2/MnxZn1-xFe2O4的制备与表征
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Abstract:
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%。 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. 重庆市基础与前沿研究计划重点项目（CSTC，2015jcyjBX0015）
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