Preparation of Nitrogen-Doped Porous Carbon from Waste Polyurethane Foam by Hydrothermal Carbonization for H₂S Adsorption

Abstract

In this work, we reported a nitrogen-doped porous carbon (NPC) that was prepared from waste polyurethane (PU) foams through hydrothermal carbonization and further activation. The possible reactions occurred during the hydrothermal carbonation and activation process of waste PU were proposed based on the results of gas chromatography–mass spectrometry and thermogravimetric Fourier transform infrared. Hydrothermal carbonization significantly improved the porous structure and surface N-containing active groups on carbon. The specific surface area and the total pore volume were obtained at 1419 m2/g and 0.80 cm3/g, respectively, for porous carbon prepared under 200 °C for 6 h, which were much higher than those without hydrothermal carbonization (1100 m2/g and 0.66 cm3/g). Moreover, the nitrogen contents on the porous carbon increased from 1.4 to 2.8 wt % with the majority of pyridinic and pyrrolic N species. The saturated sulfur capacity of NPC reached as high as 205.06 mg/g, which was almost 2.5 times higher than that without hydrothermal carbonization. The desulfurization performance could be tightly related to the hierarchical porous structure and active nitrogen species on the carbon induced by hydrothermal carbonization/catalysis. Thus, our current efforts provide a facile strategy for the preparation of porous adsorbent for H2S removal with the low cost and high efficiency.

Yeast-Based Porous Carbon with Superior Electrochemical Properties

“…PC-0.3-800 shows a honeycomb structure, which is connected by holes with different pore sizes, and the structure is relatively fluffy. Porous carbon with distinct pore size of the honeycomb structure is more conducive to electrolyte exchange. , Additionally, the direct exposure of honeycomb porous carbon to the electrolyte may efficiently shorten the ion diffusion pathway and lower its resistance. XRD is applied to investigate the crystal structure of the obtained carbon materials.…”

Cu Nanoparticles Supported on Fe3O4@SiO2@N-Doped Carbon Core–Shell Nanocomposites for C–N Coupling Reactions in Water

“…48,49 Notably, the structure contained mesopores; therefore, the substrate molecules were easily transported in the catalyst, and the hydrothermal temperature used for fabricating the catalysts was a crucial factor in determining the pore structure. 50 Thus, Fe 3 O 4 @SiO 2 @GA/Cu catalysts prepared at different hydrothermal temperatures, for example, 170, 180, and 190 °C were studied. The majority of the pore diameters were mostly distributed between 5 and 10 nm.…”

“…The specific surface area and pore size distribution of the Fe 3 O 4 @SiO 2 @GA/Cu and Fe 3 O 4 @GA/Cu catalysts were measured (Figure a,b). The adsorption isotherms were typical type-IV curves at relative pressures between 0.5 and 1, indicating that the structures contained mesopores. , Notably, the structure contained mesopores; therefore, the substrate molecules were easily transported in the catalyst, and the hydrothermal temperature used for fabricating the catalysts was a crucial factor in determining the pore structure . Thus, Fe 3 O 4 @SiO 2 @GA/Cu catalysts prepared at different hydrothermal temperatures, for example, 170, 180, and 190 °C were studied.…”

Recent advancement of biomass-derived porous carbon based materials for energy and environmental remediation applications

“…17c. 338 Likewise, N-rich hierarchical porous carbon from waste cypress sawdust exhibited sulfur capacity of nearly 426.2 mg g −1 at room temperature together with high regeneration ability. 339 Cellulosic jute thread waste was used for synthesizing N, S-rich nanoporous carbon that can be employed as nanoadsorbents for the removal of CO 2 and H 2 S from gaseous stream.…”