Preparation of high stable nanofluid based N-doped quantum dot in diethanolamine solution for carbon dioxide absorption

Abstract

According to the increase of greenhouse gases such as CO2 in the atmosphere following the growth and establishment of various industries, serious and rapid solutions for this challenge are required to prevent the release of this gas. CO2 absorption in amine nanofluid is an emerging method nowadays. In this study, chitosan was synthesized from shrimp shells to prepare carbon dots (CDs). These CDs were treated by amino groups using the hydrothermal method. The structural properties of nanoparticles (NPs) were characterized by FT-IR, XRD, SEM, and zeta potential analyses and the NPs were quasi-spherical with regular micropores. The efficiency of CO2 absorption from a gas mixture of CO2/N2 was considered as a percentage of the difference in CO2 absorption capacities between nanofluid and diethanolamine (DEA, 10 wt%) solution compared to the CO2 absorption capacity of DEA. The experimental results showed that the efficiency of CO2 absorption for CDCH:N-200-8, CDCH:N-180-12, CDCH:N-200-12 and CDCH:N-180-8 nanofluids was equal to 73.86, 53.87, 49.25 and 22.88 %, respectively, which had increased CO2 absorption significantly compared to the DEA base fluid. Among the synthesized samples, CDCH:N-200-8 nanofluid was a unique candidate for CO2 capture from the atmosphere due to its high absorption efficiency since these particles had advantages such as ease of use, no corrosion, no deposition in the process, chemical inertness and high thermal stability.