Abstract
A high cost-performance carbon dioxide sorbent based on hierarchical porous carbons (HPCs) was easily prepared by carbonization of raw sugar using commercially available nano-CaCO3 as a double-acting template. The effects of the initial composition and carbonization temperature on the micro-mesoporous structure and adsorption performance were examined. Also, the importance of post-activation behavior in the development of micropores and synthesis route for the formation of the interconnected micro-mesoporous structure were investigated. The results revealed excellent carbon dioxide uptake reaching up 2.84 mmol/g (25oC, 1 bar), with micropore surface area of 786 m2/g, micropore volume of 0.320 cm3/g and mesopore volume of 0.233 cm3/g. We found that high carbon dioxide uptake was ascribed to the developed micropores and interconnected micro-mesoporous structure. As an expectation, the optimized HPCs offers a promising new support for the high selective capture of carbon dioxide in the future.
Highlights
Carbon dioxide has gradually increased in the atmosphere over the past century, resulting in increasing concerns about the global warming and climate change (Kanki et al, 2016; Qi et al, 2017; Li et al, 2019)
Tremendous research has been devoted to the development of new technologies for carbon dioxide capture and storage (CCS), especially those based on high-performance sorbents for carbon dioxide capture (Liang et al, 2004; Santis et al, 2016; Patel et al, 2017; Zhu et al, 2019)
The decomposition temperature of nano-CaCO3 was estimated to about 660◦C, and carbonization of pure raw sugar occurred at around 200◦C with a carbon yield of ca. 19% at 900◦C
Summary
Carbon dioxide has gradually increased in the atmosphere over the past century, resulting in increasing concerns about the global warming and climate change (Kanki et al, 2016; Qi et al, 2017; Li et al, 2019). Three imaginable and reasonable sources caused the micropores to form: the voids derived from high-temperature pyrolysis of raw sugar, carbon dioxide escape routes during CaCO3 decomposition, and fine etching pores in carbon wall. For each HPCs series, both micropore volume and surface area increased as raw sugar ratio rose.
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