Synthesis of novel and engineered UiO-66/graphene oxide nanocomposite with enhanced H2S adsorption capacity

Abstract

Herein, in order to desulfurize the gas streams and assist in the environmental protection, a novel nanocomposite adsorbent was synthesized. To this end, the Zr-metal organic framework (UiO-66)/graphene oxide (GO) nanocomposites were synthesized by employing different GO contents (3, 7, and 10 wt%) for hydrogen sulfide (H2S) adsorption in a dynamic adsorption system at 30, 40 and 50 °C. The prepared nano-adsorbents were characterized by TEM, SEM, BET, FTIR, and TGA techniques. The H2S absorption capacity of the ZMGO nanocomposites and the pristine UiO-66 were measured. The H2S adsorption results revealed that the adsorption capacities of H2S on the prepared nanocomposites were much better than the pristine UiO-66 adsorbent. The ZMGO-3 nanosorbent resulted in the maximum H2S uptake of 8.7 mmolS/g at 30 °C due to higher surface area and the micropore volume, which was about 3 times higher than that of the UiO-66. Finally, the repeated adsorption/desorption experiments clarified that the adsorption capability of ZMGO-3 was approximately stable along with a 10-15% reduction of the H2S adsorption capacity H2S after 3 cycles.