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Adsorption of acetone and cyclohexane onto CO2 activated hydrochars
Xueyang Zhang1, Wei Xiang2, Bing Wang3
1School of Environmental Engineering, Jiangsu Key Laboratory of Industrial Pollution Control and Resource Reuse, Xuzhou University of Technology, Xuzhou, 221018, PR China; Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL, 32611, USA; Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing, 210093, PR China.
Activated hydrochars effectively remove toxic volatile organic compounds (VOCs). CO2 activation significantly enhances hydrochar performance for VOC abatement, demonstrating reusability and potential for environmental remediation.
Area of Science:
- Environmental Chemistry
- Materials Science
Background:
- Volatile organic compounds (VOCs) pose significant risks to human health and the environment.
- Effective methods for VOC removal are crucial for environmental protection.
Purpose of the Study:
- To investigate the efficacy of CO2-activated hydrochars for the removal of volatile organic compounds (VOCs).
- To evaluate the adsorption performance and mechanism of hydrochars for model VOCs (acetone and cyclohexane).
Main Methods:
- Hydrochars were activated using CO2 to increase surface area.
- Adsorption experiments were conducted using acetone and cyclohexane as model VOCs.
- Specific surface area, adsorption capacity, and desorption characteristics were analyzed.
Main Results:
- CO2 activation dramatically increased hydrochar surface area (up to 1308 m²/g).
- Activated hydrochars exhibited significantly higher VOC adsorption capacities (39.42-121.74 mg/g) compared to pristine hydrochars.
- Adsorption was found to be an exothermal process, strongly correlated with surface area, indicating physical adsorption.
Conclusions:
- CO2-activated hydrochars are highly effective for VOC removal.
- The adsorption process is primarily governed by physical adsorption, influenced by surface area.
- Activated hydrochars demonstrate excellent reusability for VOC abatement, highlighting their potential for environmental applications.
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