Synthesis of cobalt-impregnated carbon composite derived from a renewable resource: Characterization and catalytic performance evaluation

Dong Wan Cho, Kwang Hwa Jeong, Sohyun Kim, Daniel C.W. Tsang, Yong Sik Ok, Hocheol Song

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A novel nitrogen-doped biochar embedded with cobalt (Co-NB) was fabricated via pyrolysis of glucose pretreated with melamine (N donor) and Co(II). The Co-NB showed high catalytic capability by converting p-nitrophenol (PNP) into p-aminophenol (PAP) by NaBH4. The analyses of FE-SEM, TEM, BET, XRD, Raman, and X-ray photoelectron spectroscopy XPS of the Co-NB showed hierarchical porous structure (BET 326.5 m2 g− 1 and pore volume: 0.2403 cm3 g− 1) with well-dispersed Co nanoparticles (20–60 nm) on the N-doped graphitic biochar surface. The Co-NB showed higher PNP reduction capability compared to the Co-biochar without N-doping, achieving 94.3% removal within 4 min at 0.24 g L− 1 catalyst dose and initial concentration of 0.35 mM PNP. Further conversion experiments under varying environmental conditions (e.g., NaBH4 concentration (7.5–30 mM), biochar dosage (0.12–1.0 g L− 1), initial PNP concentration (0.08–0.17 mM)) were conducted in batch mode. The reusability of Co-NB was validated by the repetitive conversion experiments (5 cycles). The overall results demonstrated biochar potential as catalysts for environmental applications if properly designed.

Original languageEnglish
Pages (from-to)103-110
Number of pages8
JournalScience of the Total Environment
Volume612
DOIs
Publication statusPublished - 2018 Jan 15

Keywords

  • Catalytic reduction
  • Electron shuttle
  • Engineered biochar
  • Glucose
  • Nitrogen doping
  • p-Nitrophenol

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

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