Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (6): 1235.doi: 10.7503/cjcu20170811

• Physical Chemistry • Previous Articles     Next Articles

Synthesis of a Core-shell Structured Ag/ZIF-8 Catalyst with Mesoporous Silica Shell

XIAO Shanshan2, OUYANG Yiting2, LI Xiaoyun1,*(), WANG Zhao2, WU Pan2, DENG Zhao2,*(), CHEN Lihua2, SU Baolian2   

  1. 1. State Key Laboratory of Silicate Materials for Architectures
    2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
  • Received:2017-12-12 Online:2018-06-10 Published:2018-05-15
  • Contact: LI Xiaoyun,DENG Zhao E-mail:xiaoyunli2015@whut.edu.cn;dengzhao@whut.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No. 21301133).

Abstract:

The self-assembly technique was employed to sythesize the Ag nanoparticles on ZIF-8(Ag/ZIF-8). Cetyltrimethyl ammonium bromide(CTAB) was used as the structure-directing agent to facilitate mesoporous silica to coat on the surface of hydrophobic Ag/ZIF-8(Ag/ZIF-8@MS). The prepared Ag/ZIF-8@MS with a core-shell structure was characterized by a series of measurements. The results show that Ag/ZIF-8@MS has a uniform particle size(Ag/ZIF-8@MS: ca. 100 nm, Ag: ca. 15 nm), high specific surface area(539 m2/g) and large pore volume(0.64 m3/g). The TEM images indicate that the thickness of mesoporous silica shell is ca. 20 nm. The structure of catalyst is transformed into Ag/ZnO@MS core-shell structure after calcination at 550 ℃. Meanwhile, both of the Ag-baesd catalysts were tested for the reaction of 4-nitrophenol to prepare 4-aminophenol. The catalytic results showed that the conversion of 4-nitrophenol catalyzed by Ag/ZIF-8@MS was more than 95%, which proves the advantage of the core-shell structure with ZIF-8 as a carrier.

Key words: ZIF-8, Mesoporous silica, Silver nanoparticles, Core-shell, Catalytic performance

CLC Number: 

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