Graphene Oxide as Support for Layered Double Hydroxides: Enhancing the CO2 Adsorption Capacity

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• 作者：Ainara Garcia-Gallastegui ; Diana Iruretagoyena ; Veronica Gouvea ; Mohamed Mokhtar ; Abdullah M. Asiri ; Sulaiman N. Basahel ; Shaeel A. Al-Thabaiti ; Abdulrahman O. Alyoubi ; David Chadwick ; Milo S. P. Shaffer
• 刊名：Chemistry of Materials
• 出版年：2012
• 出版时间：December 11, 2012
• 年：2012
• 卷：24
• 期：23
• 页码：4531-4539
• 全文大小：536K
• 年卷期：v.24,no.23(December 11, 2012)
• ISSN：1520-5002

文摘

Layered double hydroxides (LDHs) show great potential as CO₂ adsorbent materials, but require improvements in stability and CO₂ adsorption capacity for commercial applications. In the current study, graphene oxide provides a light-weight, charge-complementary, two-dimensional (2D) material that interacts effectively with the 2D LDHs, in turn enhancing the CO₂ uptake capacity and multicycle stability of the assembly. As a result, the absolute capacity of the LDH was increased by 62% using only 7聽wt聽% graphene oxide (GO) as a support. The experimental procedure for the synthesis of the materials is based on a direct precipitation of the LDH nanoparticles onto GO followed by a structural and physical characterization by electron microscopy, X-ray diffraction, thermogravimetric analysis, and Brunauer鈥揈mmett鈥揟eller (BET) surface area measurements. Detailed titration confirmed the compatibility of the surface chemistry. After thermal decomposition, mixed metal oxides (MMOs) are obtained with the basic sites required for the CO₂ adsorption. A range of samples with different proportions of GO/MMO were prepared, fully characterized, and correlated with the CO₂ sorption capacity, established via TGA.

Keywords:

graphene oxide (GO); graphene; layered double hydroxide(s) (LDHs); hydrotalcite(s); sorption&qsSearchArea=searchText">CO₂ sorption; CO₂ capture and storage (CCS)