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Adsorption of CO2 on MgAl layered double hydroxides: Effect of intercalated anion and alkaline etching time |
| Yan-Yan Feng(冯艳艳)1,2, Xiao-Di Niu(牛潇迪)1, Yong-Hui Xu (徐永辉)1, and Wen Yang(杨文)1,2,† |
| 1 Department of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China; 2 Guangxi Key Laboratory of Electrochemical and Magnetochemical Functional Materials, Department of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China |
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Abstract The adsorption of CO2 on MgAl layered double hydroxides (MgAl-LDHs) based adsorbents has been an effective way to capture CO2, however the adsorption capacity was hampered due to the pore structure and the dispersibility of adsorption active sites. To address the problem, we investigate the effect of intercalated anion and alkaline etching time on the structure, morphology and CO2 uptake performances of MgAl-LDHs. MgAl-LDHs are synthesized by the one-pot hydrothermal method, followed by alkaline etching of NaOH, and characterized by x-ray diffraction, N2 adsorption, scanning electron microscopy and Fourier transform infrared spectroscopy. The CO2 adsorption tests of the samples are performed on a thermogravimetric analyzer, and the adsorption data are fitted by the first-order, pseudo-second-order and Elovich models, respectively. The results demonstrate that among the three intercalated samples, MgAl(Cl) using chloride salts as precursors possesses the highest adsorption capacity of CO2, owing to high crystallinity and porous structure, while MgAl(Ac) employing acetate salts as precursors displays the lowest CO2 uptake because of poor crystallinity, disorderly stacked structure and unsatisfactory pore structure. With regard to alkaline etching, the surface of the treated MgAl(Cl) is partly corroded, thus the specific surface area and pore volume increase, which is conducive to the exposure of adsorption active sites. Correspondingly, the adsorption performance of the alkaline-etched adsorbents is significantly improved, and MgAl(Cl)-6 has the highest CO2 uptake. With the alkaline etching time further increasing, the CO2 adsorption capacity of MgAl(Cl)-9 sharply decreases, mainly due to the collapse of pore structure and the fragmentized sheet-structure. Hence, the CO2 adsorption performance is greatly influenced by alkaline etching time, and appropriate alkaline etching time can facilitate the contact between CO2 molecules and the adsorbent.
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Received: 25 September 2020
Revised: 01 December 2020
Accepted manuscript online: 30 December 2020
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PACS:
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81.05.Rm
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(Porous materials; granular materials)
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81.07.-b
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(Nanoscale materials and structures: fabrication and characterization)
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68.43.Mn
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(Adsorption kinetics ?)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 21606058), the Natural Science Foundation of Guangxi, China (Grant Nos. 2017GXNSFBA198193 and 2017GXNSFBA198124), and the Startup Foundation for Doctors of Guilin University of Technology (Grant No. GLUTQD2015008). |
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Corresponding Authors:
†Corresponding author. E-mail: yangwen167@163.com
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Cite this article:
Yan-Yan Feng(冯艳艳), Xiao-Di Niu(牛潇迪), Yong-Hui Xu (徐永辉), and Wen Yang(杨文) Adsorption of CO2 on MgAl layered double hydroxides: Effect of intercalated anion and alkaline etching time 2021 Chin. Phys. B 30 048101
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