Journal
RESOURCES CONSERVATION AND RECYCLING
Volume 185, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.resconrec.2022.106453
Keywords
Lignocellulosic biomass; Carbon foam; Hydrothermal carbonization; Pyrolysis; Self-forming; CO2 capture
Categories
Funding
- National University of Singapore [R-302-000-209-133]
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This study presents a novel method for producing carbon foam from biowaste through modified hydrothermal carbonization and pyrolysis processes, resulting in foam and multi-porous structures. The characterization results show that the biowaste-derived carbon foam possesses hierarchical micropore, mesopore, and macropore structures. The potential application of this material for CO2 capture is demonstrated.
Thermal transformation of biowaste to carbon foam provides an economically attractive and eco-friendly strategy for biowaste recycling. Herein, we report a novel self-foaming approach involving modified hydrothermal carbonization (HTC) and pyrolysis to produce carbon foam from biowaste. Notably, biowaste-derived carbon foam consists of foam structure and multi-porous structure, originated from the self-forming process of aromatic segments during modified HTC and pyrolysis processes. Based on characterization results, biowaste-derived carbon foam possesses hierarchical micropore, mesopore and macropore with increasing sp(2) hybridized carbon atoms. We demonstrate the potential applications of this material for CO2 capture. Biowaste-derived carbon foam exhibits 5.0-fold and 4.8-fold CO2 uptake at 35 C-o and 50 C-o, respectively, compared to those of pristine biowaste. The recycling of biowaste to carbon foam for CO2 capture contributes to decarbonization efforts worldwide by a synergistic way, including the photosynthesis of atmospheric CO2 to biomass, carbon sequestration in carbon foam and CO2 capture by carbon foam.
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