Nuclear chemistry

Catalysis

Algorithm

Adsorption

Composite number

Engineering

Ecology

Biology

Materials science

Chromatography

Carbon fibers

Chemical engineering

Activated carbon

Physisorption

Organic chemistry

Mathematics

X-ray photoelectron spectroscopy

Agronomy

Desorption

Composite material

Analytical Chemistry (journal)

Bagasse

Chemistry

Scanning electron microscope

Fourier transform infrared spectroscopy

Pulp and paper industry

Specific surface area

Industrial Crops and Products

In this study, a highly selective CO2 adsorbent from sugarcane bagasse (waste biomass) was prepared, and the enrichment of nitrogen in the adsorbent was achieved via urea-KOH method. Moreover, the influence of preparing parameters such as urea addition, KOH/carbon ratio and activation temperature on the pore textural properties and CO2 uptake capacity of adsorbents were investigated. Brunauer–Emmet–Teller (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier Transform Infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the adsorbents. The results indicated that whereas the temperature and pressure of 25 °C and 1 bar, the adsorbent had the highest CO2 uptake of 4.8 mmol/g. The preparation condition of the adsorbent was at 600 °C with 15 wt% urea additions and KOH/carbon ratio of 2.0. It was also found that there were pyridinic-N (N-6), pyrrolic-/pyridonic-N (N-5), quaternary-N (N–Q) and pyridine-N-oxide (N–X) functional groups at the surface. At the same time, the SB-AC had uniform micropores (∼0.55 nm). Hence, the adsorbent had an excellent CO2/N2 selectivity. The CO2 uptake of the adsorbent was almost identical during the five runs of CO2 adsorption/desorption measurements, indicating good stability and regenerability CO2 adsorption. The narrow micro-pore volume (pore width ≤ 1 nm) fraction and N content in SB-ACs were 80–89% and 0.6–3.34 wt%, respectively. The results led to the conclusion that the narrow micropores and N content in the adsorbent were considered as the important roles for CO2 adsorption.

The N-doped activated carbon derived from sugarcane bagasse for CO2 adsorption