化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (1) : 98-101.

新材料与新技术

核壳结构Fe₃O₄@SiO₂-Ag介孔复合材料的制备及其催化性能研究

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Synthesis and catalytic property of core-shell Fe₃O₄@SiO₂-Ag mesoporous composite

Zou Yanzhao, Wang Hong, Zhou Xiaofei, Lin Guo, Jiang Huan, Hu Yu

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Received
2017-07-20
Issue Date	Revised Date
2018-03-01	2017-07-20

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摘要

通过多步法成功制备了核壳结构的Fe₃O₄@SiO₂-Ag介孔复合催化剂。采用X射线衍射仪、傅里叶红外光谱、透射电镜、紫外可见吸收光谱和氮气吸脱附仪等测试手段对复合催化剂的结构、形貌和催化性能进行了表征。在制备过程中,由于加入了表面活性剂聚乙烯吡咯烷酮,提高了银纳米粒子的分散性,使得复合材料的催化性能得到了显著的提高。结果表明:银氨溶液浓度的改变对复合催化剂的结构和催化性能有一定的影响:当[Ag(NH₃)₂]⁺溶液的浓度为0.2mol/L时,使用硼氢化钠为还原剂对染料污染物罗丹明B的催化降解性能最佳。Fe₃O₄@SiO₂-Ag-0.2复合催化剂的循环催化性能良好。在经过5次的循环催化测试后,其催化效率仍可达89%。

Abstract

The core-shell Fe₃O₄@SiO₂-Ag mesoporous composites were successfully prepared by a multi-step method.The structures,morphologies and catalytic properties of samples were characterized by XRD,FT-IR,TEM,N₂ adsorption-desorption and UV-Vis.The catalytic activities of composites increased by addition of surfactant polyvinyl pyrrolidone (PVP) which could improve the dispensability of Ag nanoparticles in preparation process.The concentration influences of tollen reagent on the structures and catalytic activities of catalysts were also investigated.The results indicated that,when the concentration of tollen reagent was 0.2mol/L,Fe₃O₄@SiO₂-Ag-0.2 displayed best catalytic activities for degradation of Rh B by using NaBH₄ as reductant and high stability.After used for 5 times,the degradation rate still reached up to 89%.

关键词

核壳结构 / Fe₃O₄@SiO₂-Ag / 催化 / 聚乙烯吡咯烷酮(PVP) / 罗丹明B

Key words

core-shell structure / Fe₃O₄@SiO₂-Ag / catalysis / polyvinyl pyrrolidone (PVP) / rhodamine B

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核壳结构Fe₃O₄@SiO₂-Ag介孔复合材料的制备及其催化性能研究[J]. 化工新型材料, 2018, 46(1): 98-101 DOI:

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