Facile Preparation of Nitrogen-Doped Activated Carbon for Carbon Dioxide Adsorption

Abstract

Nitrogen-doped activated carbons with high surface areas obtained from resorcinol and formaldehyde resins were evaluated as CO 2 adsorbents in a simulated flue gas stream under anhydrous and humid conditions. These carbons were prepared using two approaches, namely ammonia treatment without nitric acid pre-oxidation and amination after preoxidation. The pre-oxidation of activated carbons considerably enhanced the nitrogen incorporation during the amination process. The amination temperature affects the content and type of nitrogen incorporated onto the carbon surface, as determined by X-ray photoelectron spectroscopy, which enhances the specific adsorbent-adsorbate interaction for CO 2 in humid conditions. The presence of H 2 O in the feed gas significantly decreased CO 2 adsorption for a very low nitrogen content of virgin activated carbon. A sample prepared via the amination of pre-oxidized carbon at 700°C (NORF700) exhibited excellent tolerance to moisture and the highest CO 2 capacity of 2.10 mmol/g in a 7% CO 2 /83% N 2 /10% H 2 O wet stream at 50°C and 130 kPa. The high performance of NORF700 was ascribed to its high surface area, adequate micropore volume, and high amounts of pyrindinic-like and pyrrole-like nitrogen species. The results indicate that nitric acid preoxidation followed by ammonia treatment at 700°C is an appropriate process for preparing adsorbents for CO 2 separation in post-combustion applications.

Photoinactivation of Candida albicans and Escherichia coli using aluminium phthalocyanine on gold nanoparticles

“…5B(i). These peaks were attributed to C=N, pyrrolic nitrogen and the quartinary nitrogen [45][46][47]. Figure 5B(ii) shows the nitrogen 1s XPS spectrum of the conjugate.…”

Nitrogen Doped Carbon Nanofibers Derived from Water-Soluble Precursors

“…6b, shows the C 1s graphitization peak at 1226.1 eV with an inset schematic representing the different bonding configurations of nitrogen in the graphitic plane. There are generally at least five different nitrogen bonding types that have been reported which fall into a range of different binding energies [29][30][31][32][33][34] [31], containing carbon nanoparticles, showed a pyridinic state ranging from 396-400.5 eV, a pyrrolic state from 399-402 eV, and a graphitic state from 399-403.5 eV. Deconvolution of the N 1s peak suggests that the carbon network is doped with three nitrogen types (Fig.…”

“…5b, shows the C 1s graphitization peak at 1225.1 eV, along with an inset schematic showing nitrogen incorporation, which is in agreement with the XRD data that indicate formation of the (002) graphitic plane between 20-27°. Several reports have indicated that nitrogen states between 400.5-401.5 eV can be associated as quaternary or graphite-like nitrogen, which is incorporated into the structure of the extended aromatic π -system in carbon nanofiber [29][30][31][32][33][34]. The assignment of chemical groups from XPS spectra can be achieved through peak deconvolution obtained through curve fitting.…”

Experimental Study of Adsorption on Activated Carbon for CO2Capture

“…Thus, the first and most important step is to find a suitable adsorbent [1]. Carbon materials are relatively insensitive to moisture and are suitable candidates for CO 2 capture due to their pore structure and surface chemistry properties [6].…”