Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (5): 904.doi: 10.7503/cjcu20170617

Previous Articles     Next Articles

Immobilization of Chloroperoxidase with Magnetic Graphene Oxide and Its Application of Decolorization of Acid Blue 45

GAO Fengqin1,2,*, WANG Shan1, WANG Yunfang1, ZHAO Danlei2, CUI Ru2, JIANG Yucheng2,*   

  1. 1. College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang 712000, China
    2. School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;
  • Received:2017-09-12 Online:2018-04-10 Published:2018-04-10
  • Contact: GAO Fengqin,JIANG Yucheng
  • Supported by:
    † Supported by the Scientific Research Program Funded by Shaanxi Provincial Education Department, China(No.16JK1827) and the National Natural Science Foundation of China(No. 21703189).

Abstract:

Magnetic graphene oxide(MGO) was prepared using graphene oxide(GO) and Fe3O4. Chloro-peroxidase(CPO) was immobilized via adsorption method in MGO, and the immobilization conditions, such as the temperature, time and pH value of the buffer solution, were optimized. The operating stability of immobilized CPO was studied using CPO as catalyst for the degradation of acid blue 45. The activity stability of immobilized CPO was investigated from four aspects of acid base stability, H2O2 stability, thermal stability and storage stability using CPO as catalyst for the decolorization of acid blue 45. The results show that the optimal conditions are the phosphate buffer pH=3.5, the reaction time 15 min and the temperature 15 ℃. TMGO{m[NH4Fe(SO4)2·12H2O]∶m(GO)=10.7∶1} is a better immobilized carrier than FMGO{m[NH4Fe(SO4)2·12H2O]∶m(GO)=5.35∶1}. And the immobilized CPO shows a better operation stability than the free enzyme. The accumulation layer of TMGO is opened at 35—50 ℃, leading to the loss rate of immobilized enzyme activity significantly less than that of the free enzyme. TMGO-CPO has a good reusability that the activity is still over 60% after recycling 5 times.

Key words: Magnetic graphene oxide, Chloroperoxidase, Immobilization, Acid blue 45

CLC Number: 

TrendMD: