Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (4): 1184-1191.DOI: 10.1016/S1872-2067(21)63998-0

• Articles • Previous Articles    

Pickering interfacial biocatalysis with enhanced diffusion processes for CO2 mineralization

Boyu Zhanga, Jiafu Shia,b,c,*(), Yang Zhaoa, Han Wanga, Ziyi Chua, Yu Chena, Zhenhua Wud, Zhongyi Jiangb,d,#()   

  1. aSchool of Environmental Science & Engineering, Tianjin University, Tianjin 300072, China
    bCollaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
    cState Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
    dKey Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2021-11-09 Accepted:2021-11-09 Online:2022-03-05 Published:2022-03-01
  • Contact: Jiafu Shi, Zhongyi Jiang
  • Supported by:
    National Excellent Youth Science Fund Project(22122809);National Natural Science Foundation of China(21621004);Natural Science Foundation of Tianjin(19JCYBJC19700);Open Funding Project of the State Key Laboratory of Biochemical Engineering(2020KF-06)

Abstract:

Utilization of carbon dioxide (CO2) has become a crucial and anticipated solution to address environmental and ecological issues. Enzymes such as carbonic anhydrase (CA) can efficiently convert CO2 into various platform chemicals under ambient conditions, which offers a promising way for CO2 utilization. Herein, we constructed a Pickering interfacial biocatalytic system (PIBS) stabilized by CA-embedded MOFs (ZIF-8 and ZIF-L) for CO2 mineralization. Through structure engineering of MOFs and incorporation of Pickering emulsion, the internal and external diffusion processes of CO2 during the enzymatic mineralization were greatly intensified. When CO2 was ventilated at a flow rate of 50 mL min-1for 1 h, the pH value of PIBS dropped from ~8.00 to ~6.50, while the average pH value of free system only dropped to ~7.15, indicating that the initial reaction rate of CO2 mineralization of PIBS is nearly twice that of the free system. After the 8thcycle reaction, PIBS can still produce more than 9.8 mg of CaCO3 in 5 min, realizing efficient and continuous mineralization of CO2.

Key words: Carbon dioxide conversion, Carbonic anhydrase, Pickering emulsion, Metal-organic frameworks, Diffusion intensification