Ghani Siti Musliha Mat, Rabat Nurul Ekmi, Abdul Rahim Abdul Rahman, Johari Khairiraihanna, Siyal Ahmer Ali, Kumeresen Rowin
Chemical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Perak, Malaysia.
Gels. 2023 Mar 15;9(3):229. doi: 10.3390/gels9030229.
In most carbon dioxide (CO) capture processes, chemical absorption using an amine solvent is widely used technology; however, the solvent is prone to solvent degradation and solvent loss which leads to the formation of corrosion. This paper investigates the adsorption performance of amine-infused hydrogels (AIFHs) to increase carbon dioxide (CO) capture by leveraging the potency of amine absorption and adsorption properties of class F fly ash (FA). The solution polymerization method was used to synthesize the FA-grafted acrylic acid/acrylamide hydrogel (FA-AAc/AAm), which was then immersed in monoethanolamine (MEA) to form amine infused hydrogels (AIHs). The prepared FA-AAc/AAm showed dense matrices morphology with no obvious pore at the dry state but capable of capturing up to 0.71 mol/g CO at 0.5 wt% FA content, 2 bar pressure, 30 °C reaction temperature, 60 L/min flow rate, and 30 wt% MEA contents. Cumulative adsorption capacity was calculated and Pseudo-first order kinetic model was used to investigate the CO adsorption kinetic at different parameters. Remarkably, this FA-AAc/AAm hydrogel is also capable of absorbing liquid activator that was 1000% more than its original weight. FA-AAc/AAm can be used as an alternative AIHs that employ FA waste to capture CO and minimize the GHG impact on the environment.
在大多数二氧化碳（CO₂）捕集过程中，使用胺溶剂的化学吸收是广泛应用的技术；然而，该溶剂容易发生溶剂降解和溶剂损失，从而导致腐蚀的形成。本文研究了胺基注入水凝胶（AIFHs）的吸附性能，通过利用胺吸收的效力和F类粉煤灰（FA）的吸附特性来提高二氧化碳（CO₂）的捕集量。采用溶液聚合法合成了粉煤灰接枝丙烯酸/丙烯酰胺水凝胶（FA-AAc/AAm），然后将其浸入单乙醇胺（MEA）中形成胺基注入水凝胶（AIHs）。制备的FA-AAc/AAm在干燥状态下呈现致密的基质形态，没有明显的孔隙，但在0.5 wt%的FA含量、2 bar压力、30°C反应温度、60 L/min流速和30 wt%的MEA含量下，能够捕集高达0.71 mol/g的CO₂。计算了累积吸附容量，并使用伪一级动力学模型研究了不同参数下的CO₂吸附动力学。值得注意的是，这种FA-AAc/AAm水凝胶还能够吸收比其原始重量多1000%的液体活化剂。FA-AAc/AAm可以用作一种替代的胺基注入水凝胶，利用粉煤灰废料捕集CO₂，并将温室气体对环境的影响降至最低。
