Adsorption properties of carbonized polyacrylonitrile deposited on gamma-alumina and silica gel by precipitation polymerization

作者：Kustrowski Piotr^*; Janus Rafal; Kochanowski Andrzej; Chmielarz Lucjan; Dudek Barbara; Piwowarska Zofia; Michalik Marek

来源：Materials Research Bulletin, 2010, 45(7): 787-793.

DOI：10.1016/j.materresbull.2010.03.017

• Composites
• Polymers
• Chemical synthesis
• Thermogravimetric analysis (TGA)
• Surface properties

The precipitation polymerization method was used for the deposition of various contents of polyacrylonitrile on two oxide-type supports (gamma-alumina and silica gel). The synthesized materials were characterized by thermal analysis performed in inert and oxidizing atmospheres. The mechanism of polyacrylonitrile decomposition was proposed. In order to gain effective adsorbents of volatile organic compounds the polyacrylonitrile/support composites were carbonized at elevated temperatures. The texture and morphology of the calcined materials were examined by low-temperature sorption of N(2) and scanning electron microscopy, respectively. An influence of thermal treatment conditions and carbonaceous species loading on adsorption capacity of methyl-ethyl ketone vapour was also determined. Attenuated total reflection Fourier transform infrared spectroscopy measurements revealed that the ladder-type polyacrylonitrile species formed above 250 degrees C and stable up to about 350-400 degrees C are the most effective sites for methyl-ethyl ketone sorption. The carbonaceous species dispersion was found to be an additional factor influencing the adsorption capacity of the carbonized polyacrylonitrile/support composites.

• 出版日期2010-7