4.7 Article

Experimental and Theoretical Investigations into the Performance and Mechanism of CO2 Capture by 3D and 2D ZnAl Layered Double Hydroxides

Journal

INORGANIC CHEMISTRY
Volume 59, Issue 23, Pages 17722-17731

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c02931

Keywords

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Funding

  1. National Natural Science Foundation of China [21503188]
  2. Natural Science Foundation of Zhejiang Province [LGC20B050008]
  3. Opening Project of Key Laboratory of Clean Dyeing and Finishing Technology of Zhejiang Province [QJRZ1901]
  4. Huzhou Municipal Natural Science Foundation of China [2020YZ02]

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Two-dimensional (2D) materials have a wide range of applications in adsorption and catalysis because of their high specific surface areas and large number of surface active sites. In this paper, bulk ZnAl layered double hydroxides (ZnAl-LDHs or bulk-LDHs) and 2D monolayer ZnAl-LDHs (monolayer-LDHs) were constructed and used for CO2 capture at temperatures of 298-573 K. The experimental results show that monolayer-LDHs have a large specific surface area (455 m(2) g(-1)) and shows an excellent CO2 capture performance (4.5 mmol g(-1)). The CO2 adsorption capacity of monolayer-LDHs decreases greatly with an increase of the temperature, while bulk-LDHs are less affected by the temperature. Moreover, the parameters of charge distribution, density of states, and charge transfer of bulk-LDHs and monolayer-LDHs were studied in detail by density functional theory, and the difference of the adsorption mechanism between two LDH materials in CO2 capture was compared. It is found that monolayer-LDHs have better electronic activity than bulk-LDHs. At low temperature, CO2 is more likely to be physically adsorbed on the surface of monolayer-LDHs, and the adsorption process is more likely to occur. CO2 is more easily adsorbed on the surface of bulk-LDHs in the form of chemisorption, the adsorption energy is larger (-1.01 eV), but the CO2 capture capacity is quite stable at high temperature.

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