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

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2021, 31(6), pp.1249-1260
  • DOI : 10.1007/s42823-021-00248-z
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : November 2, 2020
  • Accepted : April 12, 2021
  • Published : December 1, 2021

Dai Zhong 1 Ren Peng-Gang 1 Zhang Hua 1 Gao Xin 1 Jin Yan-Ling 1

1Xi’an University of Technology

Accredited

ABSTRACT

Here, a novel nitrogen-doped carbon nano-material (N-CGNM) with hierarchically porous structure was prepared from spent cofee ground for efcient adsorption of organic dyes by a simple one-step carbonization process (the uniform mixture consists of spent cofee 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 specifc 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 cofee 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 fndings show a great guidance for the development of low-cost but efcient selective adsorbent.

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Total Citation Counts(KCI+WOS) (14) This is the number of times that the duplicate count has been removed by comparing the citation list of WoS and KCI.

Scopus Citation Counts (14) This is the result of checking the information with the same ISSN, publication year, volume, and start page between articles in KCI and the SCOPUS journals. (as of 2024-10-01)

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