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Researchers produced nitrogen doped bimodal cellular structure activated carbon for adsorption applications.
Phenol-urea-formaldehyde (PUF) organic foam were used as precusors for the new monolithic nitrogen-containing microporous cellular activated carbons production. Carbonization and CO2 activation were used to prepare this novel monolithic nitrogen-containing activated carbon foam with both interconnected macroporous and micro/meso- porosity structures from the developed PUF organic foam. The macroporosity corresponded to the connected network of cells with diameters ranging from 100 to 600 µm, and the pinholes in the cell walls had diameters ranging from 1 to 2 µm. The micro/mesoporosity is located at the inner surface of the cells. They can be used just like the classic activated carbon as an adsorbent, catalyst support, energy storage and biological material in various industries, but higher adsorption kinetics.
New monolithic nitrogen-containing microporous cellular activated carbon was successfully prepared from phenol-urea-formaldehyde (PUF) organic foam for CO2 and H2 adsorption. The macroporosity corresponded to the connected network of cells with diameters ranging from 100 to 600 µm, and the pinholes in the cell walls had diameters ranging from 1 to 2 µm. The micro/mesoporosity is located at the inner surface of the cells.
Cellular activated carbon, a new type of activated carbon we prepared, is based on carbon foams, the inner surfaces of which are activated physically by CO2 to generate an available surface made up of micro/mesopores. The carbon foams are enriched with macropores that are connected to the cell walls. After activation, the cellular activated carbon produces a great deal of micro and mesopores at the surface of the macropores; therefore, this new bimodal cellular activated carbon can be used just like the classic activated carbon as an adsorbent, catalyst support, energy storage and biological material in various industries.
But the most difference is the ACs are normally in the form of grains or are granular with surface areas mainly being controlled by their inner microporosity (pore size less than 2 nm) and mesoporosity (pore size ranging from 2 to 50 nm). The mesoporosity also plays a role in the pathways for reactants flowing through the carbon grains. When we using this carbon foam as a precursor provides pathways for the macropores, so the resulting features for the new cellular activated carbon are the monolithic shape and high adsorption kinetics due to the size of the bigger pores.
This research was supported in part by grants from the National Natural Science Foundation of China (31300488) and the Fujian Agriculture and Forestry University Fund for Distinguished Young Scholars (xjq201420).
Addition co-authors of the Nano paper are Lu LUO from Fujian Argricuture and Forestry University and Mizi Fan Brunel University.
Corresponding author for this study is Weigang ZHAO, weigang-hao@hotmail.com. The paper can be found in NANO.
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