SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (12): 2523-2530.DOI: 10.1016/j.cjche.2018.05.014

• Separation Science and Engineering • Previous Articles     Next Articles

Facile synthesis of hierarchically porous carbons by controlling the initial oxygen concentration in-situ carbonization of ZIF-8 for efficient water treatment

Na Zhou1, Yan Du2, Chunyu Wang2, Rizhi Chen1   

  1. 1 State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2 College of Environment, Nanjing Tech University, Nanjing 210009, China
  • Received:2018-03-20 Revised:2018-05-21 Online:2019-01-09 Published:2018-12-28
  • Contact: Yan Du, Rizhi Chen
  • Supported by:

    Supported by the National Key R&D Program of China (2016YFB0301503), the National Natural Science Foundation of China (91534110, 21776127), the Jiangsu Province Natural Science Foundation for Distinguished Young Scholars (BK20150044), and the Jiangsu Province Natural Science Foundation (BK20160978).

Facile synthesis of hierarchically porous carbons by controlling the initial oxygen concentration in-situ carbonization of ZIF-8 for efficient water treatment

Na Zhou1, Yan Du2, Chunyu Wang2, Rizhi Chen1   

  1. 1 State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing 210009, China;
    2 College of Environment, Nanjing Tech University, Nanjing 210009, China
  • 通讯作者: Yan Du, Rizhi Chen
  • 基金资助:

    Supported by the National Key R&D Program of China (2016YFB0301503), the National Natural Science Foundation of China (91534110, 21776127), the Jiangsu Province Natural Science Foundation for Distinguished Young Scholars (BK20150044), and the Jiangsu Province Natural Science Foundation (BK20160978).

Abstract: The state-of-the-art approaches for adjusting the structural characteristics of porous carbons are the aftertreatments, which are complicated and time consuming. In this work, a facile approach was developed, i.e., controlling the initial oxygen concentration in-situ during the direct carbonization of zeolitic imidazole framework-8 (ZIF-8), to adjust the pore structure and prepare hierarchically porous carbons. The introduction of oxygen can significantly affect the crystalline and pore structures of porous carbons, and promote the pore widening and the formation of mesopores. An appropriate initial oxygen concentration can notably enhance the surface area and mesopore volume of porous carbon, and then improve the adsorption capacity toward methylene blue (MB) dye from water by 3.4 times. The developed approach is more efficient at lower carbonization temperature. Moreover, the introduction of oxygen can increase the ratio of HO-C=O groups on the carbon surface, leading to enhanced interaction with MB molecules and higher adsorption capacity toward MB. The as-prepared porous carbons exhibit superior adsorption capacities toward MB dye as compared to the reported ZIF-8 derived carbons. These findings would aid the development of porous carbon materials with high performance.

Key words: Porous carbon, ZIF-8, Carbonization, Oxygen, Adsorption, Water treatment

摘要: The state-of-the-art approaches for adjusting the structural characteristics of porous carbons are the aftertreatments, which are complicated and time consuming. In this work, a facile approach was developed, i.e., controlling the initial oxygen concentration in-situ during the direct carbonization of zeolitic imidazole framework-8 (ZIF-8), to adjust the pore structure and prepare hierarchically porous carbons. The introduction of oxygen can significantly affect the crystalline and pore structures of porous carbons, and promote the pore widening and the formation of mesopores. An appropriate initial oxygen concentration can notably enhance the surface area and mesopore volume of porous carbon, and then improve the adsorption capacity toward methylene blue (MB) dye from water by 3.4 times. The developed approach is more efficient at lower carbonization temperature. Moreover, the introduction of oxygen can increase the ratio of HO-C=O groups on the carbon surface, leading to enhanced interaction with MB molecules and higher adsorption capacity toward MB. The as-prepared porous carbons exhibit superior adsorption capacities toward MB dye as compared to the reported ZIF-8 derived carbons. These findings would aid the development of porous carbon materials with high performance.

关键词: Porous carbon, ZIF-8, Carbonization, Oxygen, Adsorption, Water treatment