Biochar production from waste rubber-wood-sawdust and its potential use in C sequestration: Chemical and physical characterization

Wan Azlina Wan Abdul Karim Ghani, Ayaz Mohd, Gabriel da Silva, Robert T. Bachmann, Yun H. Taufiq-Yap, Umer Rashid, Ala'a H. Al-Muhtaseb

Research output: Contribution to journalArticle

132 Citations (Scopus)

Abstract

Biochars have received increasing attention because of their potential environmental applications such as soil amending and atmospheric C sequestration. In this study, biochar was produced from waste rubber-wood-sawdust. The produced biochars were characterized by Brunauer-Emmett-Teller (BET) gas porosimetry, scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and Fourier transform infrared spectroscopy (FTIR). Pyrolysis temperature was shown to have a strong influence on both thermal and chemical characteristic of biochar samples. The experimental data shows that the biochar samples can absorb around 5% water by mass (hydrophilic) at lower temperatures (650°C), biochar samples were thermally stable and became hydrophobic due to the presence of aromatic compounds. Carbon content (over 85%) increased with increasing temperature, and showed an inverse effect to the elemental ratios of H/C and O/C. The very low H/C and O/C ratios obtained for the biochar indicated that carbon in this material is predominantly unsaturated. BET results showed that the sawdust derived biochars have surface areas between 10 and 200m2g-1 and FTIR indicated an aromatic functional group about 866cm-1 in most of the samples. The rate of CO2 adsorption on sawdust derived biochar generally increased with increasing temperature from 450 to 650°C but then decreased with increase in the production temperature. Derived biochar represents a potential alternative adsorbent for C sequestration.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalIndustrial Crops and Products
Volume44
DOIs
Publication statusPublished - Jan 2013

Keywords

  • Biochar
  • C sequestration
  • Characterization
  • Pyrolysis
  • Rubber-wood-sawdust

ASJC Scopus subject areas

  • Agronomy and Crop Science

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