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

19 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.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalEnergy Conversion and Management
Volume145
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

Fingerprint

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

Keywords

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

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this

Simultaneous production of syngas and magnetic biochar via pyrolysis of paper mill sludge using CO2 as reaction medium. / Cho, Dong Wan; Kwon, Gihoon; Yoon, Kwangsuk; Tsang, Yiu Fai; Ok, Yong Sik; Kwon, Eilhann E.; Song, Hocheol.

In: Energy Conversion and Management, Vol. 145, 01.01.2017, p. 1-9.

Research output: Contribution to journalArticle

Cho, Dong Wan ; Kwon, Gihoon ; Yoon, Kwangsuk ; Tsang, Yiu Fai ; Ok, Yong Sik ; Kwon, Eilhann E. ; Song, Hocheol. / Simultaneous production of syngas and magnetic biochar via pyrolysis of paper mill sludge using CO2 as reaction medium. In: Energy Conversion and Management. 2017 ; Vol. 145. pp. 1-9.
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AB - 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.

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