Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 9, Pages 10933-10941Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c22333
Keywords
CO2 sequestration; attapulgite; melamine; stability; cyclability; DFT calculation
Funding
- National Natural Science Foundation of China [51874145]
- Scientific and Technological Developing Scheme of Jilin Province [20200401028GX]
- Open Foundation of State Key Laboratory of Mineral Processing [BGRIMM-KJSKL-2019-07]
- Province/Jilin University coconstruction project-funds for new materials [SXGJSF2017-3]
- China Ocean Mineral Resources R&D Association (COMRA) Special Foundation [DY135-R2-1-01, DY135-46]
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A clay-based composite material was developed for CO2 sequestration, with melamine loaded onto attapulgite to enhance stability and recyclability. The composite showed higher CO2 adsorption capacity and improved performance after multiple cycles, attributed to the strong interaction between the melamine and attapulgite matrix.
A type of highly stable and recyclable clay-based composite was developed for sequestration of CO2, which was synthesized by loading melamine (MEL) onto attapulgite (ATT) via a wet impregnation method. The synthesized materials were characterized by N-2 adsorption-desorption, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG), and transmission electron microscopy (TEM). By means of thermal and acidic treatments more active sites of ATT were exposed, and large surface areas were obtained. The MEL molecules were well combined with those exposed sites, which enhanced stability and cyclability for CO2 sequestration. On the basis of CO2 adsorption-desorption measurements, the composite of ATT-MEL was found to have a higher CO2 adsorption capacity (4.91 cm(3)/g) which was much higher than that of CO2 absorption on bare MEL (1.30 cm(3)/g) at 30 degrees C. After ten cycles of reusing, the composite exhibited even higher capacity for CO2 adsorption by an increased percentage of 5.91% (30 degrees C) and 5.77% (70 degrees C) compared to the capacity in the first cycle. The reason lies in the strong interaction between melamine and attapulgite matrix which was further confirmed by DFT calculations. The MEL was validated to have advantages over aliphatic amines (TEPA) in modifying ATT to get high stability of CO2-adsorbents.
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