TY - JOUR
T1 - Tailoring wood waste biochar as a reusable microwave absorbent for pollutant removal
T2 - Structure-property-performance relationship and iron-carbon interaction
AU - Sun, Yuqing
AU - Zhang, Qiaozhi
AU - Clark, James Hanley
AU - Graham, Nigel J.D.
AU - Hou, Deyi
AU - Ok, Yong Sik
AU - Tsang, Daniel C W
N1 - © 2022 Elsevier Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.
PY - 2022/8/27
Y1 - 2022/8/27
N2 - This study innovated the concept in designing an efficient and reusable microwave (MW) absorbent through concurrent exploitation of carbon graphitization, oxygen functionalization, and carbothermal iron reduction underpinned by an endothermic co-pyrolysis of wood waste and low-dosage iron. A powerful MW assimilation was accomplished from nanoscale amorphous magnetic particles as well as graphitized microporous carbon-iron skeleton in the biochar composites. Relative to a weak magnetic loss derived from the iron phase, the graphitic carbon architecture with abundant surface functionalities (i.e., Csingle bondO and Cdouble bondO) exhibited a strong dielectric loss, which was thus prioritized as major active sites during MW reuse. The MW-absorbing biochar demonstrated a fast, robust, and durable removal of a refractory herbicide (2,4-dichlorophenoxy acetic acid) under mild MW irradiation with zero chemical input, low electricity consumption, and negligible Fe dissolution. Overall, this study will foster carbon–neutral industrial wastewater treatment and wood waste valorization.
AB - This study innovated the concept in designing an efficient and reusable microwave (MW) absorbent through concurrent exploitation of carbon graphitization, oxygen functionalization, and carbothermal iron reduction underpinned by an endothermic co-pyrolysis of wood waste and low-dosage iron. A powerful MW assimilation was accomplished from nanoscale amorphous magnetic particles as well as graphitized microporous carbon-iron skeleton in the biochar composites. Relative to a weak magnetic loss derived from the iron phase, the graphitic carbon architecture with abundant surface functionalities (i.e., Csingle bondO and Cdouble bondO) exhibited a strong dielectric loss, which was thus prioritized as major active sites during MW reuse. The MW-absorbing biochar demonstrated a fast, robust, and durable removal of a refractory herbicide (2,4-dichlorophenoxy acetic acid) under mild MW irradiation with zero chemical input, low electricity consumption, and negligible Fe dissolution. Overall, this study will foster carbon–neutral industrial wastewater treatment and wood waste valorization.
U2 - 10.1016/j.biortech.2022.127838
DO - 10.1016/j.biortech.2022.127838
M3 - Article
SN - 0960-8524
VL - 362
JO - BIORESOURCE TECHNOLOGY
JF - BIORESOURCE TECHNOLOGY
M1 - 127838
ER -