Citation: Feng-lei Liu, Shui-xia Chen, Wen-hao Fu. Synthesis and CO₂ Adsorption Behavior of Amine-functionalized Porous Polyacrylonitrile Resin[J]. Acta Polymerica Sinica, ;2018, 0(7): 886-892. doi: 10.11777/j.issn1000-3304.2018.17332 shu

Synthesis and CO₂ Adsorption Behavior of Amine-functionalized Porous Polyacrylonitrile Resin

School of Chemistry, Sun Yat-Sen University, Guangzhou 510275

Corresponding author: Shui-xia Chen, cescsx@mail.sysu.edu.cn
Received Date: 18 December 2017
Revised Date: 6 January 2018
Available Online: 3 May 2018

The objective of this study was to develop a novel solid amine adsorbent using porous polyacrylonitrile resin instead of mesoporous silica as support for CO₂ adsorption from flue gas. This solid amine adsorbent was prepared by a suspension polymerization of divinylbenzene (DVB) with acrylonitrile (AN), followed by aminating with tetraethylenepentamine (TEPA). Scanning electronic microscope, nitrogen adsorption-desorption isotherms at 77 K, and thermogravimetry (TG) were employed to characterize the surface structure, porosity, and thermal stability of the solid amine adsorbent. Factors that could determine the CO₂ adsorption performance of the solid amine adsorbent, such as amine species, adsorption temperature and moisture, were investigated. The experimental results showed that the maximum adsorption capacity of CO₂ (1.87 mmol/g) wasachieved at 25 °C with CO₂ concentration of 10 vol%, the flow rate of 30 mL/min and TEPA as the organic amine. The solid amine adsorbent modified with TEPA (PAN-TEPA), a longer chain amine among all amines used, showed superior amine efficiency and CO₂ adsorption capacity to the other two amine species with shorter chains. CO₂ adsorption capacity decreased obviously as the adsorption temperature increased, because the reaction between CO₂ and amine groups was an exothermic reaction. The presence of water could significantly improve CO₂ amount adsorbed on the adsorbent by promoting the chemical adsorption of CO₂ on PAN-TEPA. A higher equilibrium adsorption capacity (2.97 mmol/g) was achieved in the presence of moisture. Meanwhile, the kinetics study found that Avrami kinetic model was more fitted to accurately describe CO₂ adsorption than the Pseudo-first and Pseudo-second order models, indicating that both physical adsorption and chemical adsorption were involved in CO₂ adsorption. Moreover, this solid amine adsorbent could be regenerated with nitrogen stream at 75 °C, and it kept stable CO₂ adsorption capacity after ten cycles of adsorption-desorption. All these features indicated that the amine-functionalized porous polyacrylonitrile resin has a high potential for CO₂ capture and separation from flue gas.
- CO₂,
- Adsorption,
- Porous polymer,
- Kinetics
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Synthesis and CO₂ Adsorption Behavior of Amine-functionalized Porous Polyacrylonitrile Resin