TY - JOUR
T1 - Adsorption of Ca2 + on single layer graphene oxide
AU - Terracciano, Amalia
AU - Zhang, Jianfeng
AU - Christodoulatos, Christos
AU - Wu, Fengchang
AU - Meng, Xiaoguang
N1 - Publisher Copyright:
© 2017
PY - 2017/7
Y1 - 2017/7
N2 - 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.
AB - 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.
KW - Calcium adsorption
KW - Colloidal stability
KW - Graphene oxide
KW - Raman spectra
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U2 - 10.1016/j.jes.2017.01.008
DO - 10.1016/j.jes.2017.01.008
M3 - Article
C2 - 28647268
AN - SCOPUS:85012930629
SN - 1001-0742
VL - 57
SP - 8
EP - 14
JO - Journal of Environmental Sciences (China)
JF - Journal of Environmental Sciences (China)
ER -