Abstract
In this study, for the first time, the nanoparticle (NP) of Fe2O3@glutamine (C5H10N2O3) was synthesized to improve the Fe2O3 properties in absorbing carbon dioxide (CO2) using the base fluid of hydrous N-methyl-2-pyrrolidone (NMP) solution (50 wt%), as a physically powerful CO2 absorbent. To do this, several nano-NMP solutions, in different weight percentages of NPs, were first prepared. Then, in a batch setup, the nano-NMP solutions were directly exposed to CO2 gaseous (at the pressures of 20, 30, and 40 bar) to clarify the effects of the mass percentage of NPs and initial pressure on CO2 absorption. Results clearly illustrated that Fe2O3 nanofluid was not stable more than 0.025 wt%. However, Fe2O3@glutamine nanofluid was stable approximately two times more than Fe2O3 nanofluid due to the presence of glutamine as a hydrophilic agent in the structure of Fe2O3@glutamine. Moreover, in comparison to the base fluid (NMP solution), although Fe2O3 increased CO2 absorption up to 9.14%, Fe2O3@glutamine NPs caused the CO2 absorption to increase up to 19.41%, which can be determined as the chemical reactions of two amino groups in the glutamine structure with CO2 and also higher stability of Fe2O3@glutamine NPs compared to bare Fe2O3 NPs. To achieve accurate results, all the mentioned experiments were repeated 5 times. The performance of Fe2O3 and Fe2O3@glutamine NPs after the fifth trial reduced by less than 3.5%, which reveals that the synthesized NPs had almost stable efficiency throughout their applications.
Highlights
Carbon dioxide (CO2) is known as one of the most dangerous greenhouse gaseous which might bring several severe problems like climate change and acid rains if the amount of this exceeds 400 ppm in the atmosphere (Jiang et al 2014; Lee et al 2016; Rangwala 1996)
In comparison to the base fluid (NMP solution), Fe2O3 increased CO2 absorption up to 9.14%, Fe2O3@glutamine NPs caused the CO2 absorption to increase up to 19.41%, which can be determined as the chemical reactions of two amino groups in the glutamine structure with CO2 and higher Stability of Fe2O3@glutamine NPs compared to bare Fe2O3 NPs
fourier transform infrared spectroscopy (FTIR) analysis was performed to examine the molecular bonds of the synthesized Fe2O3 and Fe2O3@glutamine NPs (Bahmani et al 2020; Rahmatmand et al 2016)
Summary
Carbon dioxide (CO2) is known as one of the most dangerous greenhouse gaseous which might bring several severe problems like climate change and acid rains if the amount of this exceeds 400 ppm in the atmosphere (Jiang et al 2014; Lee et al 2016; Rangwala 1996). Kim et al (Kim et al 2008) investigated the effect of NPs type on the capture of CO2, which raised the CO2 capture (to the maximum of 24%) of the base fluid (water) at atmospheric pressure in a bubble column system. Results revealed that modified NPs increased the absorption of CO2 to the maximum of 70% in respect to water-based solvent. Using NPs has turned into an fascinating solution in a wide domain of research projects accomplished to improve the absorption of CO2, but in industrial scales, NPs dispersion is the most crucial problem (Zhang et al 2018b), requiring a significant sum of power and ultrasonic irradiation (Schmerr and Song 2007). Improving the stability of NPs is a key factor to increase the performance of CO2 absorption in industrial applications
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