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Oxygen-containing functional group-facilitated CO2 capture by carbide-derived carbons
Wei Xing1, Chao Liu1, Ziyan Zhou2
1State Key Laboratory of Heavy Oil Processing, School of Science, China University of Petroleum, Qingdao 266580, People's Republic of China.
Carbide-derived carbons (CDCs) with varying oxygen content were synthesized. Increased surface oxygen content in these porous carbons significantly enhances carbon dioxide (CO2) adsorption capacity.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Carbide-derived carbons (CDCs) are versatile porous materials.
- Developing efficient CO2 adsorbents is crucial for climate change mitigation.
- Surface functionalization is a key strategy to enhance adsorbent performance.
Purpose of the Study:
- To investigate the effect of surface oxygen content on the CO2 adsorption capacity of CDCs.
- To elucidate the mechanism behind enhanced CO2 adsorption by oxygen-functionalized CDCs.
- To explore a new avenue for designing advanced porous carbon materials for CO2 capture.
Main Methods:
- Synthesis of CDCs from TiC powder via chlorination and HNO3 oxidation.
- Systematic characterization using FTIR, XPS, ultimate analysis, EDS, N2 adsorption, and TEM.
- CO2 adsorption measurements and quantum chemical calculations.
Main Results:
- Oxidation increased the CO2 adsorption capacity of CDCs.
- CO2 adsorbability correlated linearly with surface oxygen content, not microporosity or surface area.
- Quantum chemical calculations revealed that oxygen atoms facilitate hydrogen bonding with CO2.
Conclusions:
- Surface oxygen content is a critical factor for high CO2 adsorption in CDCs.
- Acidic oxygen-containing groups, similar to basic nitrogen groups, enhance CO2 capture.
- This study offers a novel approach for designing porous carbons with superior CO2 adsorption capabilities.
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