Preparation and performance of Fe3O4/MnO2 magnetic bimetal oxide catalyst
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摘要: 具有磁性的非均相催化剂价格低廉、低污染、高能效、容易从溶液中分离出来。经过水热合成法合成的Fe3O4/MnO2磁性复合氧化物催化剂在活化过一硫酸盐(2KHSO5·KHSO4·K2SO4)产生硫酸根自由基(SO4-)降解水中有机污染物表现出了优良的性能。把不同质量的磁性Fe3O4微球与线状的MnO2负载到一起,合成三种Fe3O4:MnO2质量比分别为1:3、2:3、1:1的Fe3O4/MnO2催化剂,经过XRD、SEM和TEM表征,表明这两种金属氧化物负载到一起。对比不同Fe3O4:MnO2质量比的Fe3O4/MnO2磁性复合氧化物催化剂活化2KHSO5·KHSO4·K2SO4的活性,发现Fe3O4/MnO2(2:3)催化剂催化活性最高。通过考察不同因素对Fe3O4/MnO2(2:3)催化活性的影响得出,水中罗丹明B(Rh B)降解的最佳条件为10 mg/L Rh B、0.4 g/L Fe3O4/MnO2催化剂、0.3 g/L 2KHSO5·KHSO4·K2SO4、pH=8。Fe3O4/MnO2(2:3)磁性复合氧化物催化剂经过3次循环利用后,催化活性没有明显下降。SO4-在降解水中Rh B起主要作用。Abstract: The heterogeneous catalyst of magnetism is low cost, little hazardous, high efficient and easy separation from aqueous solutions. The Fe3O4/MnO2 magnetic bimetal oxide catalyst prepared via hydrothermal method shows a better performance in activating 2KHSO5·KHSO4·K2SO4 for Rhodamine B (Rh B) degradation in aqueous solutions. Different quality of magnetic microspheres Fe3O4 and nanowire MnO2 loaded together, synthesizing Fe3O4/MnO2 catalyst with three different Fe3O4:MnO2 mass ratios, which are 1:3, 2:3, 1:1. The characterizations of XRD, SEM and TEM show that two metallic oxide are loaded together. Compared with the catalytic performances of three Fe3O4/MnO2 magnetic bimetal oxide catalysts according to activate 2KHSO5·KHSO4·K2SO4 for Rh B degradation in aqueous solutions, founding the Fe3O4/MnO2(2:3) catalyst has the best catalytic activity. According to investigating the effects of reaction parameters on Rh B degradation on Fe3O4/MnO2(2:3) catalyst, the best conditions of Rh B degradation in aqueous solutions are 10 mg/L Rh B, 0.4 g/L Fe3O4/MnO2, 0.3 g/L 2KHSO5·KHSO4·K2SO4 and pH=8. After three cyclic utilizations, the 2:3 Fe3O4/MnO2 magnetic bimetal oxide catalyst still have a good performance. SO4- plays an important role in degrading Rh B in aqueous solutions.
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Keywords:
- magnetic material /
- bimetal oxide /
- peroxymonosulfate /
- sulfate radical /
- catalytic
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