Study on modification of titanium-based metal-organic framework and catalytic performance

QU Yunpeng1,2 ZHANG Bingxing1,2 SHI Jinbiao1,2 TAN Xiuniang1,2 HAN Buxing1,2 YANG Guanying1 ZHANG Jianling1,2

(1.Institute of Chemistry, Chinese Academy of Sciences, Beijing, China 100190)
(2.School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, China 100190)
【Knowledge Link】metal–organic framework

【Abstract】A series of materials were prepared by modifying titanium-based metal-organic framework material NH2-MIL-125 with hydrogen peroxide at a certain temperature. The effects of modification methods and conditions on the properties of materials were studied systematically. However, NH2-MIL-125 as a photocatalyst suffers from low catalytic activity and stability, which largely restrict its practical applications. In order to improve the catalytic activity of NH2-MIL-125, we adopted a solvothermal route by using H2O2 to modify NH2-MIL-125. A series of materials were synthesized by treating NH2-MIL-125 with different volumes of H2O2 at different temperatures. X-ray diffraction, scanning electron microscope, transmission electron microscope, ultraviolet-visible light absorption spectroscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, and N2 adsorption analysis were used to characterize the structures and properties of the obtained product. Furthermore, their photocatalytic performances for the visible-light-driven oxidation of benzyl alcohol were tested. The results show that the product modified by 10 mL H2O2 at 50 ℃ exhibits excellent catalytic activity and selectivity. The maximum turnover frequency is nearly 6 times as high as that of NH2-MIL-125 at the same experimental conditions. The partial loss of organic ligands and the introduction of peroxide groups could generate more catalytic-active sites, which is responsible for the improved catalytic activity.

【Keywords】 metal-organic framework; NH2-MIL-125; catalyst; photochemistry; oxidation;

【DOI】

【Funds】 National Natural Science Foundation of China (21525316, 21633254)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 71, No. 01, Pages 283-289+430

January 2020

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Abstract

  • Introduction
  • 1 Experimental
  • 2 Results and discussion
  • 3 Conclusions
  • References