SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 66 ›› Issue (2): 84-93.DOI: 10.1016/j.cjche.2023.12.004

• Full Length Article • 上一篇    下一篇

A green cross-linking method for the preparation of renewable three-dimensional graphene sponges for efficient adsorption of Congo red dye

Zhuang Liu, Bo Gao, Haoyuan Han, Yuling Li, Haiyang Fu, Donghui Wei   

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China
  • 收稿日期:2023-08-30 修回日期:2023-11-17 出版日期:2024-02-28 发布日期:2024-04-20
  • 通讯作者: Bo Gao,E-mail:gaob@smm.neu.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (51671052, 51750110513 and 52250610222), the Fundamental Research Funds for the Central Universities (N182502042) and the Liao Ning Revitilization Talents Program (XLYC1902105).

A green cross-linking method for the preparation of renewable three-dimensional graphene sponges for efficient adsorption of Congo red dye

Zhuang Liu, Bo Gao, Haoyuan Han, Yuling Li, Haiyang Fu, Donghui Wei   

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang 110819, China
  • Received:2023-08-30 Revised:2023-11-17 Online:2024-02-28 Published:2024-04-20
  • Contact: Bo Gao,E-mail:gaob@smm.neu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51671052, 51750110513 and 52250610222), the Fundamental Research Funds for the Central Universities (N182502042) and the Liao Ning Revitilization Talents Program (XLYC1902105).

摘要: Graphene-based materials possess significant potential for the treatment of dye wastewater due to their exceptional adsorption properties toward stubborn pollutants. However, their utilization is hindered by high preparation costs, low yields, environmental pollution during synthesis, and challenges in regenerating the adsorbent. This study proposes a novel approach to address these limitations by developing nitrogen-doped three-dimensional (3D) polyvinyl alcohol (PVA) cross-linked graphene sponges (N-PGA) using a cross-linking method with ammonium carbonate. This method offers a relatively mild, environmentally friendly approach. Ammonium carbonate serves as both a reducing and modifying agent, facilitating the formation of the intrinsic structure of N-PGA and acting as a nitrogen source. Meanwhile, PVAis utilized as the cross-linking agent. The results demonstrate that N-PGA exhibits a favorable internal 3D hierarchical porous structure and possesses robust mechanical properties. The measured specific surface area (BET) of N-PGA was as high as 406.538m2·g-1, which was favorable for its efficient adsorption of Congo red (CR) dye molecules. At an initial concentration of 50mg·L-1, N-PGA achieved an impressive removal rate of 89.6% and an adsorption capacity of 112mg·g-1 for CRdye. Furthermore, it retained 79% of its initial adsorption capacity after 10 cycles, demonstrating excellent regeneration performance. In summary, the synthesized N-PGA displays remarkable efficacy in the adsorption of CR dye in wastewater, opening up new possibilities for utilizing 3D porous graphene nanomaterials as efficient adsorbents in wastewater treatment.

关键词: Green chemistry, Graphene sponge, Adsorbents, Adsorption, Congo red, Regeneration

Abstract: Graphene-based materials possess significant potential for the treatment of dye wastewater due to their exceptional adsorption properties toward stubborn pollutants. However, their utilization is hindered by high preparation costs, low yields, environmental pollution during synthesis, and challenges in regenerating the adsorbent. This study proposes a novel approach to address these limitations by developing nitrogen-doped three-dimensional (3D) polyvinyl alcohol (PVA) cross-linked graphene sponges (N-PGA) using a cross-linking method with ammonium carbonate. This method offers a relatively mild, environmentally friendly approach. Ammonium carbonate serves as both a reducing and modifying agent, facilitating the formation of the intrinsic structure of N-PGA and acting as a nitrogen source. Meanwhile, PVAis utilized as the cross-linking agent. The results demonstrate that N-PGA exhibits a favorable internal 3D hierarchical porous structure and possesses robust mechanical properties. The measured specific surface area (BET) of N-PGA was as high as 406.538m2·g-1, which was favorable for its efficient adsorption of Congo red (CR) dye molecules. At an initial concentration of 50mg·L-1, N-PGA achieved an impressive removal rate of 89.6% and an adsorption capacity of 112mg·g-1 for CRdye. Furthermore, it retained 79% of its initial adsorption capacity after 10 cycles, demonstrating excellent regeneration performance. In summary, the synthesized N-PGA displays remarkable efficacy in the adsorption of CR dye in wastewater, opening up new possibilities for utilizing 3D porous graphene nanomaterials as efficient adsorbents in wastewater treatment.

Key words: Green chemistry, Graphene sponge, Adsorbents, Adsorption, Congo red, Regeneration