Tan Li, Wang Jiangen, Cai Bihai, Wang Chengyin, Ao Zhimin, Wang Shaobin
Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangdong 510006, China.
College of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Environmental Engineering and Monitoring, Yangzhou University, Yangzhou 225002, China.
J Hazard Mater. 2022 Feb 15;424(Pt A):127348. doi: 10.1016/j.jhazmat.2021.127348. Epub 2021 Sep 26.
Carbon-based adsorbents with a high adsorption capacity and low price have been widely used in the removal of volatile organic compounds (VOCs), but the poor gas selectivity and reusability limit their industrial applications. In this work, disc-like nitrogen-rich porous carbon materials (HAT-Xs) were synthesized to remove typical VOCs via adsorption. By controlling the synthesis temperature from 450 to 1000 °C, the C/N ratio of the HAT-Xs increased from 1.85 to 12.56. The HAT-650 synthesized at 650 °C with the high specific surface area of 305 m g exhibits the highest adsorption capacity of 141 mg g for ethyl acetate (which is 3.2 times for that of activated carbon), and 39.4 mg g for n-hexane, 48.6 mg g for toluene. Kinetic studies indicated that the adsorption is physical adsorption and that the interior surface diffusion is the main rate-determining step during the adsorption progress, the interior surface diffusion rate of ethyl acetate on HAT-650 is 1.455 mg g min. At the same time, the desorption and reuse tests show that HAT-650 has excellent reusability with low desorption and regeneration temperature of 120 °C, and high desorption efficiency of 95.2% and that it could be a promising ethyl acetate adsorbent for industrial applications.
具有高吸附容量和低价格的碳基吸附剂已被广泛用于去除挥发性有机化合物（VOCs），但其较差的气体选择性和可重复使用性限制了它们的工业应用。在这项工作中，合成了盘状富氮多孔碳材料（HAT-Xs）以通过吸附去除典型的VOCs。通过将合成温度控制在450至1000°C之间，HAT-Xs的C/N比从1.85增加到12.56。在650°C合成的具有305 m²/g高比表面积的HAT-650对乙酸乙酯的吸附容量最高，为141 mg/g（是活性炭的3.2倍），对正己烷为39.4 mg/g，对甲苯为48.6 mg/g。动力学研究表明，吸附为物理吸附，且内表面扩散是吸附过程中的主要速率决定步骤，乙酸乙酯在HAT-650上的内表面扩散速率为1.455 mg/(g·min)。同时，解吸和重复使用测试表明，HAT-650具有出色的可重复使用性，解吸和再生温度低至120°C，解吸效率高达95.2%，它可能是一种有前途的用于工业应用的乙酸乙酯吸附剂。
