Adsorption of Ca2 + on single layer graphene oxide

Amalia Terracciano, Jianfeng Zhang, Christos Christodoulatos, Fengchang Wu, Xiaoguang Meng

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Graphene oxide (GO) holds great promise for a broad array of applications in many fields, but also poses serious potential risks to human health and the environment. In this study, the adsorptive properties of GO toward Ca2+ and Na+ were investigated using batch adsorption experiments, zeta potential measurements, and spectroscopic analysis. When pH increased from 4 to 9, Ca2+ adsorption by GO and the zeta potential of GO increased significantly. Raman spectra suggest that Ca2+ was strongly adsorbed on the GO via –COOCa+ formation. On the other hand, Na+ was adsorbed into the electrical diffuse layer as an inert counterion to increase the diffuse layer zeta potential. While the GO suspension became unstable with increasing pH from 4 to 10 in the presence of Ca2+, it was more stable at higher pH in the NaCl solution. The findings of this research provide insights in the adsorption of Ca2 + on GO and fundamental basis for prediction of its effect on the colloidal stability of GO in the environment.

Original languageEnglish
Pages (from-to)8-14
Number of pages7
JournalJournal of Environmental Sciences (China)
Volume57
DOIs
StatePublished - Jul 2017

Keywords

  • Calcium adsorption
  • Colloidal stability
  • Graphene oxide
  • Raman spectra

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