Synthesis of novel monolithic activated carbons from phenol-urea-formaldehyde resin

Phenol-urea-formaldehyde (PUF) organic foams have been firstly synthesized from phenol-urea-formaldehyde resin under alkaline conditions. Carbonization and CO2 activation were then used to prepare a novel monolithic nitrogen-containing activated carbon foam with both interconnected macroporous and micro/meso-porosity structures from the developed PUF organic foam. The macroporosity produced from the organic foams, which corresponds to the connected network of cells, has a diameter in the range of 100-600 mu m. The micro/meso-porosity produced by activation is located at the inner surface of the cells. The developed carbons have achieved an apparent surface area as high as 1674 m(2) g(-1) and microporous volume as high as 0.86 cm(3) g(-1), which are similar to that of many commercial carbonaceous adsorbents, but with a nitrogen content around 1.5 wt%. These activated carbon foams are expected to have higher adsorption kinetics and some special applications due to the heteroatom nitrogen introduced and the bimodal cellular structure.