Characterization of biochar from pyrolysis of rice husk and rice straw

Ho Thi Phuong, Md Azhar Uddin, Yoshiei Kato

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


In this study biochar was prepared by pyrolysis of rice husk and rice straw. The effect of pyrolysis temperature (350, 450 and 550 °C) and the heating rate (10 and 50 °C/min) on the yield and properties of the biochar were investigated. The results indicated that ash content, fixed carbon content and the pH of the char increased while the volatile matters content and CEC decreased with the increase of pyrolysis temperature. Elemental analysis showed that the carbon content of the char increased while H and O decreased with raising temperature, resulting in the decrease of H/C and O/C ratios. The volatile matters released during the pyrolysis process creating pores in the carbonaceous materials which was revealed with the scanning electron microscope images. The results of pore volume from N2 adsorption isotherm and Hg porosimetry showed that most of the biochar pores were macropores (≥50 nm). Although the rice husk biochar had higher specific surface area, micropore and mesopore volume, but the water adsorption capacity of the rice husk biochar was much lower than the rice straw biochar. Thus the macropore volumes may have a significant effect on the water adsorption capacity of the biochar.

Original languageEnglish
Pages (from-to)439-446
Number of pages8
JournalJournal of Biobased Materials and Bioenergy
Issue number4
Publication statusPublished - Aug 2015


  • Biochar
  • Char
  • Characterization
  • Pyrolysis
  • Rice husk
  • Rice straw

ASJC Scopus subject areas

  • Bioengineering
  • Biomaterials
  • Renewable Energy, Sustainability and the Environment


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