From grape bagasse to graphene-like porous carbon nanosheets for CO 2 capture.

Graphene-based materials have increasingly attracted attention in recent years. It is a material is recognized worldwide due to its numerous applications in several sectors. However, graphene production involves several challenges: scalability, high costs, and high-quality production. This study synthesized graphene-like porous carbon nanosheets (GPCNs) through a thermochemical process under a nitrogen atmosphere using grape bagasse as a precursor. Three temperatures (700, 800, and 900 ºC) of the pyrolysis process were studied. Chemical graphitization and activation were used to form high-specific surface area materials: FeCl 3 .6H 2 O (aq) and ZnCl 2(s) in a simultaneous activation-graphitization (SAG) method. The materials obtained (GPCN700, GPCN800, and GPCN900) were compared to previously produced chars (C700, C800, and C900). A high specific surface area and total pore volume were obtained for GPCN materials, and GPCN900 presented the highest values: 1062.7 m 2 g -1 and 0.635 cm 3  g -1 , respectively. The GPCN and char materials were classified as mesoporous and applied as adsorbents for CO 2(g) . The GPCN800 presented the best CO 2(g) adsorbent, with a CO 2(g) adsorption capacity of 168.71 mg g -1 .