TY - JOUR
T1 - Impacts of different activation processes on the carbon stability of biochar for oxidation resistance
AU - Xu, Zibo
AU - He, Mingjing
AU - Xu, Xiaoyun
AU - Cao, Xinde
AU - Tsang, Daniel C.W.
N1 - Funding Information:
We appreciate the financial support from the Hong Kong Research Grants Council (PolyU 15222020) and Hong Kong Environment and Conservation Fund (ECF Project 101/2020) for this study. We also acknowledge the equipment support provided by the University Research Facility in Materials Characterization and Device Fabrication (UMF) of the Hong Kong Polytechnic University.
Funding Information:
We appreciate the financial support from the Hong Kong Research Grants Council (PolyU 15222020 ) and Hong Kong Environment and Conservation Fund (ECF Project 101/2020) for this study. We also acknowledge the equipment support provided by the University Research Facility in Materials Characterization and Device Fabrication (UMF) of the Hong Kong Polytechnic University.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/10
Y1 - 2021/10
N2 - Biochar modification is widely used to improve its capability for environmental application, while its impact on carbon sequestration potential is unknown. Herein, the oxidation-resistance stability of biochar with different activation processes was first evaluated, which is crucial for sustainable production of engineered biochar. Thermal activation enhanced the thermal stability of biochar with a higher R50 as 61.5–62.7%, whereas a higher carbon loss of 15.2–17.2% was revealed after chemical oxidation. Physical activation of biochar had marginal effect on thermal stability, but it still weakened its chemical stability. By contrast, chemical activation with H2SO4 improved the stability in terms of chemical-oxidation (6.7% carbon loss) and thermal-oxidation (R50 as 66.2%). Further analysis revealed that the thermal stability of engineered biochar was controlled by aromaticity, while the surface area was a vital factor correlating to the chemical stability. Our findings serve as an important reference to understand trade-off between biochar stability and broader application.
AB - Biochar modification is widely used to improve its capability for environmental application, while its impact on carbon sequestration potential is unknown. Herein, the oxidation-resistance stability of biochar with different activation processes was first evaluated, which is crucial for sustainable production of engineered biochar. Thermal activation enhanced the thermal stability of biochar with a higher R50 as 61.5–62.7%, whereas a higher carbon loss of 15.2–17.2% was revealed after chemical oxidation. Physical activation of biochar had marginal effect on thermal stability, but it still weakened its chemical stability. By contrast, chemical activation with H2SO4 improved the stability in terms of chemical-oxidation (6.7% carbon loss) and thermal-oxidation (R50 as 66.2%). Further analysis revealed that the thermal stability of engineered biochar was controlled by aromaticity, while the surface area was a vital factor correlating to the chemical stability. Our findings serve as an important reference to understand trade-off between biochar stability and broader application.
KW - Carbon sequestration
KW - Carbon stability
KW - Engineered biochar
KW - Oxidation resistance
KW - Physical/chemical activation
UR - http://www.scopus.com/inward/record.url?scp=85110633304&partnerID=8YFLogxK
U2 - 10.1016/j.biortech.2021.125555
DO - 10.1016/j.biortech.2021.125555
M3 - Journal article
AN - SCOPUS:85110633304
SN - 0960-8524
VL - 338
JO - Bioresource Technology
JF - Bioresource Technology
M1 - 125555
ER -
