A series of Nb-Ce/SUZ-4 catalysts are prepared by loading niobium and cerium on SUZ-4 molecular sieves through the co-precipitation method.Their catalytic performance in degrading methylene blue is evaluated by using methylene blue-containing wastewater as study object.It is demonstrated that 20%P-1N1C/S,which has a loading amount of 20% and a niobium/cerium mass ratio of 1∶1,shows the best elimination performance,reaching a 94% of removal rate in 120 min.The quenching experiment and characterization results show that the electrons transfer between the different valence ions of Nb and Ce in the catalyst catalyzes hydrogen peroxide to form main active species ·OH to degrade methylene blue.The 20%P-1N1C/S catalyst delivers a MB removal efficiency of more than 80% after 5 cycles,showing a good practical application prospect.
紫外分光光度计(UV,UV-5500PC),上海元析公司生产;X射线衍射仪(XRD,Rigaku Ultima Ⅳ),日本Rigaku Ultima Ⅳ生产;X射线光电子能谱仪(XPS,ESCALAB 250Xi),USA Thermo Science生产;比表面积与孔体积测定仪(BET,ASAP2460),美国 Micromeritics生产。
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