石墨烯量子点辅助合成Cu-MOFs及CO<sub>2</sub>吸附行为

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Abstract In this paper, a kind of Cu-based MOFs which is low-cost and easy to be synthesized in large-scale was selected as the CO₂ adsorbent. Graphene quantum dots (GQDs) were in-situ incorporated in the synthesis process of MOFs to control their crystal structure. The research results indicated that adding of a proper amount of GQDs was beneficial to increase the specific surface area and pore volume of Cu-MOFs. Compared with the pristine MOFs, CO₂ adsorption capacities of the modified MOFs were improved. At 25℃ and 100kPa, the highest increased 4.5%. As temperature increased, the improvement of CO₂ adsorption capacity was more obvious. The adsorption capacities of the modified MOFs for N₂ were lower than that of the pristine MOFs, thus their calculated adsorption selectivity values of CO₂/N₂ were higher and nearly doubled. Combined with the results of isosteric heats of CO₂ adsorption, especially the Cu-MOFs adsorbent added with a proper amount of N-doped graphene quantum dots, which not only had higher CO₂ uptake and selectivity, but exhibited more ideal adsorption heat within the physical adsorption category. Therefore, it has the characteristics of superior CO₂ adsorption performance and low energy consumption for desorption, which provides a little reference value for the modification of MOFs adsorbent.

Key words： metal-organic frameworks (MOFs) graphene quantum dots (GQDs) CO₂ adsorption adsorption selectivity adsorption heat

Received: 05 February 2021

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X511

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	PANG Mi-jie
	CHEN Yu-wen
	WANG Wan-ci
	ZHAO Yun-xia

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PANG Mi-jie,CHEN Yu-wen,WANG Wan-ci等. Synthesis and CO₂ adsorptive storage of Cu-MOFs by graphene quantum dots-assistant route[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4565-4571.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4565

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