Nitrogen‑doped and hierarchically porous carbon derived from spent coffee ground for efficient adsorption of organic dyes

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 31권 / 6호
ㆍ저자명 : Zhong Dai, Peng‑Gang Ren, Hua Zhang, Xin Gao, Yan‑Ling Jin

목차

Abstract
1 Introduction
2 Experience
2.1 Materials
2.2 Preparation of N-CGNM
2.3 Materials characterization
2.4 Adsorption experiments
3 Results and discussion
3.1 Morphology and structure characterization
3.2 Adsorption of dyes
3.3 Adsorption isotherm and kinetics
4 Conclusion
Acknowledgements
References

영어 초록

Here, a novel nitrogen-doped carbon nano-material (N-CGNM) with hierarchically porous structure was prepared from spent coffee ground for efficient adsorption of organic dyes by a simple one-step carbonization process (the uniform mixture consists of spent coffee ground, urea, and CaCl2 with the ratio of 1:1:1, which was heated to 1000 °C with a rate of 10 °C min− 1 and held at 1000 °C for 90 min in N2 atmosphere to carry out carbonization, activation, and N-doping concurrently). The morphology and structure analysis show that the prepared N-CGNM exhibits hierarchical pore structure, high specific surface area (544 m2/ g), and large numbers of positively charged nitrogen-containing groups. This unique structure and chemical composition endow N-CGNM with an excellent adsorption capacity toward anion Congo red (623.12 ± 21.69 mg/g), which is obviously superior to that (216.47 ± 18.43 mg/g) of untreated spent coffee ground-based carbon nano-materials (CGM). Oppositely, the adsorption capacity of N-CGNM towards cation methylene blue is inferior to that of CGM due to the existence of electrostatic repulsion. These findings show a great guidance for the development of low-cost but efficient selective adsorbent.

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