Preparation of amine functionalized reduced graphene oxide/methyl diethanolamine nanofluid and its application for improving the CO 2 and H 2 S absorption.

A novel approach was examined by addition of amine-modified reduced graphene oxide (rGO) to amine solutions in order to enhance the CO absorption capacity of amine solutions. Amine functionalized reduced graphene oxide (rGO)/methyl diethanolamine (MDEA) nanofluid was prepared for absorption of acid gases (CO, HS). GO was synthesized via a modified hummer method and functionalized through solvothermal method. As-synthesized NH-rGO was characterized by XRD, BET, SEM, FTIR, EDX and XPS analysis to determine the structure. NH-rGO was dispersed in MDEA and displayed excellent stability verified by zeta potential analysis. NH-rGO/MDEA nanofluid showed high absorption capacity toward CO and HS. The absorption capacity of the solution for CO and HS was promoted up to 16.2% and 17.7%, respectively. Solubility results showed a reverse relationship with increasing temperature. Comparison of solubility data revealed that introducing 0.1 wt% NH-rGO to 40 wt% had a greater enhancement relative to introducing 0.1 wt% GO to the same solution.