• 1 School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia.
  • 2 Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
  • 3 School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
  • 4 School of Science, RMIT University, Melbourne, VIC, 3001, Australia
  • 5 Department of Chemical Engineering, Faculty of Engineering and Science, Curtin University, 98009, Miri, Sarawak, Malaysia.
  • 6 School of Information, Systems and Modelling, Faculty of Engineering and Information Technology, University of Technology Sydney, Sydney, NSW, 2007, Australia
Sci Rep, 2020 Nov 02;10(1):18851.
PMID: 33139793 DOI: 10.1038/s41598-020-75936-3


The recent implication of circular economy in Australia spurred the demand for waste material utilization for value-added product generations on a commercial scale. Therefore, this experimental study emphasized on agricultural waste biomass, rice husk (RH) as potential feedstock to produce valuable products. Rice husk biochar (RB) was obtained at temperature: 180 °C, pressure: 70 bar, reaction time: 20 min with water via hydrothermal carbonization (HTC), and the obtained biochar yield was 57.9%. Enhancement of zeta potential value from - 30.1 to - 10.6 mV in RB presented the higher suspension stability, and improvement of surface area and porosity in RB demonstrated the wastewater adsorption capacity. Along with that, an increase of crystallinity in RB, 60.5%, also indicates the enhancement of the catalytic performance of the material significantly more favorable to improve the adsorption efficiency of transitional compounds. In contrast, an increase of the atomic O/C ratio in RB, 0.51 delineated high breakdown of the cellulosic component, which is favorable for biofuel purpose. 13.98% SiO2 reduction in RB confirmed ash content minimization and better quality of fuel properties. Therefore, the rice husk biochar through HTC can be considered a suitable material for further application to treat wastewater and generate bioenergy.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.