In Situ Dry Chemical Synthesis of Nitrogen-Doped Activated Carbon from Bamboo Charcoal for Carbon Dioxide Adsorption

Abstract

In this work, nitrogen-doped bamboo-based activated carbon (NBAC) was in situ synthesized from simply blending bamboo charcoal (BC) with sodamide (SA, NaNH2) powders and heating with a protection of nitrogen flow at a medium temperature. The elemental analysis and X-ray photoelectron spectra of as-synthesized NBAC showed quite a high nitrogen level of the simultaneously activated and doped samples; an abundant pore structure had also been determined from the NBACs which has a narrow size distribution of micropores (<2 nm) and favorable specific surface area that presented superb adsorption performance. The fcarbon dioxide (CO2) adsorption of the NBACs was measured at 0 °C and 25 °C at a pressure of 1 bar, whose capture capacities reached 3.68–4.95 mmol/g and 2.49–3.52 mmol/g, respectively, and the maximum adsorption could be observed for NBACs fabricated with an SA/BC ratio of 3:1 and activated at 500 °C. Further, adsorption selectivity of CO2 over N2 was deduced with the ideal adsorbed solution theory ((IAST), the selectivity was finally calculated which ranged from 15 to 17 for the NBACs fabricated at 500 °C). The initial isosteric heat of adsorption (Qst) of NBACs was also determined at 30–40 kJ/mol, which suggested that CO2 adsorption was a physical process. The results of ten-cycle adsorption-desorption experimentally confirmed the regenerated NBACs of a steady CO2 adsorption performance, that is, the as-synthesized versatile NBAC with superb reproducibility makes it a perspective candidate in CO2 capture and separation application.

Chemical Activation of Banana Peel Waste-Derived Biochar Using KOH and Urea for CO2 Capture

“…From the data presented in Table 1, it can be concluded that the amount of nitrogen introduced depends on the carbonization temperature; more nitrogen was introduced into activated carbons obtained at lower temperatures. Similar observations have been reported in the literature for orange peel carbons prepared with urea [24], for N-doped activated carbons from bamboo charcoal [25] and for commercial urea-modified activated carbons [26]. The decrease in nitrogen content with increasing carbonization temperature is due to the degradation of unstable thermal nitrogen groups at higher process temperatures [27].…”

Modification and Application of Bamboo-Based Materials: A Review—Part II: Application of Bamboo-Based Materials

“…They determined the CO 2 adsorption capacity of NBAC under conditions of 0 • C and 25 • C at a pressure of 1 bar, which reached ranges of 3.68 to 4.95 mmol/g and 2.49 to 3.52 mmol/g, respectively. Furthermore, through ten adsorptiondesorption cycles, they confirmed the stable CO 2 adsorption performance of regenerated NBAC, demonstrating that this multifunctional NBAC exhibits excellent reproducibility and is an ideal candidate material for CO 2 capture and separation applications [138].…”

Synthesis of Ultramicroporous Materials via Cross-Linking Reaction of Polynaphthalene

“…Under this circumstance, carbon capture and storage technology were put forward to reduce the concentration of CO 2 in the air . At present, solid porous materials with high-proportion ultramicropores have exhibited outstanding performance in CO 2 adsorption fields. − Zhuo used different alkali metal ions salts of carboxylic phenolic resins to prepare a series of ultramicroporous carbons by direct pyrolysis, and the CO 2 uptake could be up to 5.20 mmol g −1 at 298.15 K/1.0 bar when adding CsOH in the synthesis process . Qi used mesitylene as a raw material to synthesize the mesitylene polymer linked by the flexible methylene and carbonized the polymer with KOH at different temperatures to obtain a series of ultramicroporous carbons.…”