An efficient and eco-friendly solution-chemical route for preparation of ultrastable reduced graphene oxide suspensions

Dafang He, Liming Shen, Xiaoyan Zhang, Yifeng Wang, Ningzhong Bao, Harold H. Kung

Research output: Contribution to journalArticle

41 Citations (Scopus)


We describe a facile and eco-friendly solution approach to chemically reduce graphene oxide (GO) to high-quality graphene using nontoxic inexpensive reductants. The reduction process and mechanism of a group of eco-friendly reductants were systematically studied. These reductants perform quite differently in terms of reduction rate (l-ascorbic acid [l-AA]>d-fructose>sucrose>glucose>sodium sulfite), density of small sp2 domains (l-AA>sodium sulfite>glucose>sucrose>d-fructose), degree of reduction (l-AA>glucose>d-fructose>sodium sulfite>sucrose), and stability of the reduced GO suspension (l-AA>d-fructose>sucrose>glucose>sodium sulfite). l-AA shows the highest reducing ability, achieving the largest extent of reduction after 10 min in the presence of ammonia. Both residual oxygen functionalities and the adsorbed oxidization products of l-AA on the graphene surface are responsible for stabilizing the reduced GO suspension over several months.

Original languageEnglish
Pages (from-to)2757-2764
Number of pages8
JournalAIChE Journal
Issue number8
Publication statusPublished - Aug 2014



  • Graphene
  • Graphene oxide
  • Reducing ability
  • Solution-chemical method
  • l-ascorbic acid

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

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