Glucose-Promoted Zn-Based Metal-Organic Framework/Graphene Oxide Composites for Hydrogen Sulfide Removal

Zinc-based metal-organic frameworks/graphene oxide (MOP-5/GO) composites were synthesized via the solvothermal method. The materials were characterized by scanning electron microscopy (SEM), nitrogen adsorption, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS), and their performances for hydrogen sulfide (H2S) removal were evaluated by dynamic testing at room temperature. The composites exhibit microporous structure with a small amount of mesopores, and the structure is highly dependent on the amount of GO loaded. The surface area and pore volume first increase and then decrease with increasing GO, reaching the maximum value when the GO ratio is 5.25%. The composites exhibit high adsorption capacities for H2S, with the maximum uptakes reaching up to 130.1 mg/g. Although the loading of GO makes a contribution to the enhancement of dispersive force in the porous structure, it leads to the crystal distortion of MOP-S. The introduction of glucose can restrain this distortion to maintain the structure stability. A good match between GO and glucose have a well synergy effect to develop the porous structure, resulting in the highest H2S adsorption capacity.