High‑efficiency adsorption for both cationic and anionic dyes using graphene nanoribbons formed by atomic‑hydrogen induced single‑walled carbon nanotube carpets

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 30권 / 2호
ㆍ저자명 : Yan Gao, Xilong Liang, Shuangping Han, Liang Wu, Guofeng Zhang, Chengbing Qin, Shanxia Bao, Qiang Wang, Lele Qi, Liantuan Xiao

목차

Abstract
Graphic abstract
1 Introduction
2 Experimental section
2.1 Preparation of VA-GNR
2.2 Sample characterization
3 Results and discussion
3.1 Adsorption kinetics
3.2 Adsorption isotherm
4 Conclusion
Acknowledgements
References

영어 초록

Carbonaceous materials are considered as potential adsorbents for organic dyes due to their unique structures which provide high aspect ratios, hydrophobic property, large efficient surface area, and easy surface modification. In this work, graphene nanoribbons (GNRs) were prepared by atomic hydrogen-induced treatment of single-walled carbon nanotube (SWCNTs), which inspire the idea of cutting and unzipping the SWCNTs carpets with the modified in molecules prevent because of the unfolding of the side-walls. The unfolded spaces and uniform vertical arrangement not only enhance the active surface area, but also promote the electrostatic and π–π interactions between dyes and GNRs. The improved adsorption capacity of GNRs beyond original SWCNTs can be determined by the adsorption kinetics and isotherm, which are evaluated through adsorption batch experiments of the typical cationic methylene blue (MB) and anionic orange II (OII) dye, respectively. It is shown that the adsorption kinetics follow a pseudo second-order model while the adsorption isotherm could be determined by Langmuir model. The results reveal that the maximum adsorption capacities of GNRs for MB and OII are 280 and 265 mg/g, respectively. The GNRs present the highly efficient, cost effective, and environmental friendly properties for the commercial applications of wastewater treatment.

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