Abstract
Amine modified layered double hydroxide (LDHs) was prepared by ultrasound assistance using N-aminoethyl-γ-aminopropyltrimethoxysilane as a grafting agent. The materials were characterized by XRD, SEM, TG, EA and XPS. The effects of ultrasonic intensity on the surface morphology of amino-modified LDHs were investigated, and the kinetics of CO2 adsorption was further analyzed. The results indicate that ultrasonic treatment significantly improves the surface morphology of LDHs and increases CO2 adsorption capacity. The CO2 adsorption capacity of the 195 W ultrasonic-assisted material was 1.65 mmol∙g-1 at 30 ℃ and 0.1 MPa, which was 50% higher than that without ultrasonic treatment. Proper ultrasonic intensity can effectively enhance chemical adsorption performance of LDHs. The kinetic model confirms that CO2 adsorption is controlled by both physical and chemical adsorption. With the increase of ultrasonic intensity, chemical adsorption of LDHs was first enhanced by physical adsorption. Chemical adsorption was suppressed when the ultrasonic intensity was too high.
| Translated title of the contribution | Ultrasound assisted synthesis of amine modified Mg-Al LDHs and its application in CO2 adsorption |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 479-486 |
| Number of pages | 8 |
| Journal | Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities |
| Volume | 34 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Apr 2020 |
Keywords
- Amine modification
- Capture
- Carbon dioxide
- Layered double hydroxide
- Ultrasound assist