Chen Yangguan, Lin Guorong, Liu Haorui, Zhang Jinrui, Chen Shuixia
PCFM Lab, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Materials Science Institute, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Langmuir. 2022 May 31;38(21):6711-6719. doi: 10.1021/acs.langmuir.2c00665. Epub 2022 May 18.
Solid amine adsorbents are promising materials to mitigate global warming. In this study, a commercially available melamine-formaldehyde sponge was adopted as a support to prepare a kind of solid amine adsorbent using polyethylenimine as a functional component and ethylene glycol diglycidyl ether as a cross-linker. The adsorbent, with abundant tunnels and a high amine loading amount, had a high adsorption capacity. When the amine loading was 89.6 wt%, the as-prepared adsorbent showed a high adsorption capacity of 7.29 mmol/g at 20 °C in the presence of water. The spent adsorbent could be easily regenerated by heating it at 90 °C, resulting in lower energy consumption. It has been proved by the Avrami model that physical and chemical adsorption coexist in the adsorption of CO on this adsorbent. Simulation with the intraparticle diffusion model has revealed that the rate-controlling step in the adsorption process was the gas film diffusion period when the adsorption temperature was below 30 °C, while it was the adsorption equilibrium period when the adsorption temperature was above 30 °C.
固体胺吸附剂是缓解全球变暖的有前景的材料。在本研究中，采用市售三聚氰胺 - 甲醛海绵作为载体，以聚乙烯亚胺为功能组分、乙二醇二缩水甘油醚为交联剂制备了一种固体胺吸附剂。该吸附剂具有丰富的孔道和高胺负载量，具有较高的吸附容量。当胺负载量为89.6 wt%时，所制备的吸附剂在20℃有水存在的情况下显示出7.29 mmol/g的高吸附容量。用过的吸附剂通过在90℃加热可轻松再生，从而降低了能源消耗。通过Avrami模型证明，该吸附剂对CO的吸附过程中物理吸附和化学吸附共存。通过颗粒内扩散模型模拟表明，吸附温度低于30℃时吸附过程中的速率控制步骤是气膜扩散阶段，而吸附温度高于30℃时是吸附平衡阶段。
