Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (7): 1591.doi: 10.7503/cjcu20200130

• Physical Chemistry • Previous Articles     Next Articles

Construction of HRP Immobilized Enzyme Reactor Based on Hierarchically Porous Metal-organic Framework and Its Dye Degradation Application

GAO Xia1,2,*(),PAN Huibin3,QIAO Chengfang1,*(),CHEN Fengying1,ZHOU Yuan1,YANG Wenhua1   

  1. 1. Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Department of Chemical Engineering & Modern Materials, Shangluo University, Shangluo 726000, China
    2. Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China
    3. Public Basic Teaching Division, Shangluo Vocational & Technical College, Shangluo 726000, China
  • Received:2020-03-09 Online:2020-07-10 Published:2020-04-15
  • Contact: Xia GAO,Chengfang QIAO E-mail:xiagao2007@163.com;xiaoqiaoqcf@126.com
  • Supported by:
    † National Natural Science Foundation of China(21703135);Natural Science Foundation of the Department of Education of Shaanxi Province, China(17JS034);Natural Science Program Funded by Shangluo University, China(19SKY003)

Abstract:

Using the unstable Cu-MOF as template agent, the hierarchically porous Zr-MOF was prepared by a self-assembled template method. Horseradish peroxidase(HRP) was successfully immobilized into the hierarchically porous Zr-MOF via physical adsorption. The effect of pore size on catalytic activity of immobilized enzyme reactor was studied by changing the concentration of the pore size regulator benzoic acid(HBC). The effects of pH value of buffer solution, immobilized time and temperature on immobilized effect were investigated. The HRP-catalyzed degradation of crystal violet was used as a model reaction to study the operational stability and reusability of HRP@Zr-MOF. The results showed that the optimal conditions are the buffer pH=3.0, the immobilization time of 60 min and the temperature of 30 ℃, and the maximum immobilization was 61.6 mg/g. HRP@Zr-MOF showed better operational stability than the free enzyme. After 10 cycles, HRP@Zr-MOF can still remain 62.3% of the catalytic activity. When HRP@Zr-MOF was applied to the degradation of crystal violet in real water samples, they show very high catalytic efficiency with the degradation rate of more than 90% within 5 min.

Key words: Metal-organic framework(MOF), Horseradish peroxidase(HRP), Immobilized enzyme reactor, Dye degradation

CLC Number: 

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