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ITEWA Team Publishes Research Paper in Cell Reports Physical Science

July 20, 2021      Author:

Recently, Cell Reports Physical Science, a journal of Cell Press, published a paper on direct air capture of carbon dioxide. The paper, titled "Modified layered double hydroxides for efficient and reversible carbon dioxide capture from air", was co-authored by Assistant Professor Zhu Xuncan, Professor Ge Tianshu and Professor Wang Ruzhu from the ITEWA Innovation Team at Shanghai Jiao Tong University, in collaboration with Dr Meng Lyu and Professor Dermot O'Hare from the University of Oxford. Shanghai Jiao Tong University is the first affiliation.

Direct air capture (DAC) is becoming a technically feasible negative emission technology. Recent studies have shown that large-scale deployment of the DAC process by adsorbent is technically and economically feasible and has the potential to achieve the target of capturing 1% of annual global CO2 emissions.

The fabrication of affordable adsorbents with large CO2 capacities, fast kinetics, and high sorption-desorption stability are of critical importance for the large-scale deployment of the DAC process. In this study, amine functionalized, aqueous miscible organic MgxAl-CO3 layered double hydroxide (LDH) nanosheets are used to efficiently and rapidly capture CO2 from ambient air. Considering the potential cost effectiveness and scalable production process, the application of monolayer amine-functionalized organic solvent-treated LDH nanosheets in fast-variable temperature adsorption-based DAC cycles is very promising.

This research work was funded by the Youth Program of the National Natural Science Foundation of China and the Shanghai Science and Technology Innovation Action Plan Program.

 

Author: Institute of Refrigeration and Cryogenics Engineering

Source: School of Mechanical Engineering

Translated by Chen Chen

Proofread by Fu Yuhe

 

SUMMARY:

Direct air capture (DAC) is becoming a technically feasible negative emission technology; however, the fabrication of affordable adsorbents with large CO2 capacities, fast kinetics, and high sorption-desorption stability are of critical importance for the large-scale deployment of the DAC process. In this study, amine functionalized, aqueous miscible organic MgxAl-CO3 layered double hydroxide (LDH) nanosheets are used to efficiently and rapidly capture CO2 from ambient air. 3-[2-(2-Aminoethylamino)ethylamino]propyl-trimethoxysilane (TRI) treatment of highly dispersed LDH nanosheets produces a sorbent exhibiting an impressive adsorption capacity of 1.05 mmol g-1 at 25°C when exposed to 400 ppm CO2, which is 30% higher than equivalent amine-functionalized SBA-15 supports. CO2 uptake reaches 70% of this maximum capacity within 30 min and is twice as fast as supported polyamines. The highly dispersed LDH nanosheets provide excellent thermal, hydrothermal, and chemical stability, with negligible performance degradation after 50 adsorption-desorption cycles.