Abstract
Zeolite 4A was successfully prepared by hydrothermal synthesis using low-grade kaolin as a raw material. The properties of the synthesized zeolite 4A were characterized by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR), 29Si magic-angle spinning (MAS)-nuclear magnetic resonance (NMR) and 27Al MAS-NMR, X-ray fluorescence (XRF), scanning electron microscopy (SEM)-energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), thermogravimetry (TG)-differential thermal analysis (DTA), and carbon dioxide adsorption analysis. The textural properties of the synthesized zeolite 4A was further studied by BET analysis technique. The thermal stability analysis showed that the heat resistance of the synthesized zeolite 4A is up to 940 °C. In addition, it is found that the Langmuir model has the best agreement with the adsorption equilibrium data for carbon dioxide by synthesized zeolite 4A and commercial zeolite 4A. Meanwhile, the carbon dioxide adsorption analysis confirmed that the maximum equilibrium adsorption amount of carbon dioxide on synthesized zeolite 4A is 59.3820 mL/g, which is higher than the 55.4303 mL/g of the commercial zeolite 4A.
Highlights
Carbon dioxide is a gas with fierce greenhouse effect
The second mass-reduction process is in the temperature range of 400–600 ◦ C, which is ascribed to the reorganization of octahedral and tetrahedral layers of the raw kaolin, resulting in the dehydroxylation of the structural OH [15,16,17]
The chemical compositions of the raw kaolin, metakaolin, synthesized zeolite 4A, and commercial zeolite 4A could be derived from Table 1
Summary
Carbon dioxide is a gas with fierce greenhouse effect. Since the beginning of industrial revolution, more and more carbon dioxide has been released into the atmosphere owing to overexploitation of fossil fuels. Adsorption methods, because of their mild operating conditions, low energy consumption, fast adsorption rate, strong regeneration performance, and stable performance, are already favorable and have been paid more and more attention by researchers at home and abroad Scholars such as Malek Alaie and Delgado et al [9,10] showed application of metalorganic frameworks (MOFs), alumina, and zeolite in the removal of carbon dioxide. F. et al [4] studied the adsorption equilibrium of methane and carbon dioxide using zeolite 13X as the adsorbent material. Zeolite 4A is synthesized by a simple hydrothermal method using low-grade kaolin as a raw material and the adsorption equilibrium of carbon dioxide on zeolite. The adsorption equilibrium data of carbon dioxide were used to fit the Langmuir isotherm model and the Freundlich isotherm model, respectively
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