改性赤泥吸附剂吸附低浓度CO<sub>2</sub>研究

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Abstract Mesoporous modified red mud adsorbent (MRM) was prepared via acid digestion and alkali reprecipitation, red mud (RM) was used as raw material in our experiment. MgO was loaded on the MRM as the support by impregnation method in order to increase the alkaline active site. The structural properties and the composition of samples were characterized and analyzed by BET, XRF, XRD, CO₂-TPD. The results showed that the specific surface area of the MRM was about 28 times higher than the RM, the pore structure was rich, and hematite was the dominant mineral phase composition in MRM. It could be seen that the specific surface area and the pore volume decreased with the increase of the Mg loading, which was due to the occupation and the blockage of the pore structure of the MRM support by MgO. The XRD test results of 5% MgO/MRM did not show the peak shape of MgO, maybe because the loading was small or Mg dispersed on the pore channels of the MRM. When the adsorption temperature was 30℃, the CO₂ adsorption capacity of the MRM was 1.54mg/g, the adsorption capacity of 5% MgO/MRM was 2.26mg/g, which indicated that the number of alkaline active sites increased significantly after MgO loading, and the chemical adsorption effect enhanced. With the increase of the temperature, the adsorption capacity gradually decreased. The results of the CO₂-TPD test showed that both MRM and 5% MgO/MRM were dominated by chemisorption, which formed the carbonate and bicarbonate structures.

Key words： red mud MgO CO₂ adsorption Mg

Received: 26 October 2022

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X705

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	LIANG Wen-jun
	YANG Lan
	ZHANG Yan
	FANG Hong-ping
	LIU Jia

Cite this article:

LIANG Wen-jun,YANG Lan,ZHANG Yan等. Adsorption of low concentration CO₂ with modified red mud[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 2798-2805.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/2798

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