Simultaneous production of syngas and magnetic biochar via pyrolysis of paper mill sludge using CO₂ as reaction medium

Dong-Wan CHO, Gihoon KWON, Kwangsuk YOON, Yiu Fai TSANG, Yong-Sik OK, Eilhann E. KWON, Hocheol SONG

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Pyrolysis of paper mill sludge (PMS) was conducted to produce syngas (H₂ and CO) and fabricate magnetic biochar (PMS biochar) for use as an adsorbent for As(V). The enhanced generation of CO was observed in the CO₂ atmosphere due to reactions triggered by CO₂. Particularly, the generation of syngas from pyrolysis of PMS in CO₂ (9.6 mol% at 720°C) was superior to the cases of pyrolysis of acid-washed PMS (i.e., minerals-eliminated PMS) in CO₂ (2.9 mol% at 720°C), which evidences catalytic effects attributed by Fe and Ca species contained in PMS. Based on the results of X-ray diffraction (XRD), pyrolysis of PMS in CO₂ led to the conversion of Fe species into magnetite (Fe₃O₄) solid phase that imparted the magnetic property to the biochar (saturation magnetization: 28.4 emu g⁻¹). The PMS biochar exhibited high As(V) adsorption capacity of 34.1 mg g⁻¹ in a given condition, which could be attributed to the great adsorption affinity of Fe₃O₄/CaCO₃ mixture toward As(V). The integrated approach for the utilization of PMS could satisfy growing demand for renewable energy and environmental sustainability. Copyright © 2017 Elsevier Ltd.
Original languageEnglish
Pages (from-to)1-9
JournalEnergy Conversion and Management
Volume145
Early online dateMay 2017
DOIs
Publication statusPublished - Aug 2017

Fingerprint

Pyrolysis
Adsorption
Magnetite
Saturation magnetization
Adsorbents
Sustainable development
Magnetic properties
Minerals
X ray diffraction
Acids

Citation

Cho, D.-W., Kwon, G., Yoon, K., Tsang, Y. F., Ok, Y. S., Kwon, E. E., et al. (2017). Simultaneous production of syngas and magnetic biochar via pyrolysis of paper mill sludge using CO₂ as reaction medium. Energy Conversion and Management, 145, 1-9.

Keywords

  • Paper mill sludge
  • Pyrolysis
  • Carbon dioxide
  • Syngas
  • Biochar
  • Adsorption