چكيده به لاتين
The increasing process of producing carbon dioxide in the environment necessitates more studies and experiments on the adsorption of this kind of pollutant. According to studies, gas adsorption was one of the most inexpensive methods for omission of the pollutants. This research discussed the omission of carbon dioxide with activated carbon adsorbent and selicagel and modification of activated carbon adsorbent surface by using piperazine in order to improve its adsorption capacity. At first the effect of the amount of adsorbent on adsorbent capacity was investigated and it was found that the adsorption capacity decreased by increasing the amount of the adsorbent. As it had the ability of fragment, the influence of particles’ size was investigated for activated carbon. As a result, the adsorption capacity decreased by increasing the size of ingredients up to size range of 500-800 micron. For investigating the influence of temperature on the adsorption capacity, the experiments of carbon dioxide adsorption by using activated carbon was done in pressure of 6 bar and temperature of 25 to 850C and it was found that the adsorption capacity decreased by increasing the temperature, furthermore the influence of pressure experiment was investigated in 25℃ steady temperature and pressure of 2 to 8 bar and the result was that the adsorption capacity of carbon dioxide was increased by increasing the pressure. For the modified activated carbon with piperazine, the influence of the amount of piperazine solution in methanol for 1 gram of activated carbon and the weight percentage was also considered. As a result, by increasing the amount of piperazine solution in methanol, because of decreasing the active surface of activated carbon, the adsorption capacity decreased. The effect of weight percentage was experimented on quality of 1, up to 4. The solution with 2 percent of piperazine had the most carbon dioxide adsorption capacity. The influence of pressure and temperature was like activated carbon. The results showed that the modification of adsorbent surface improved the adsorption capacity of carbon dioxide more than the simple adsorbent. Finally, isotherm, kinetic and thermodynamic parameter of experimented data were investigated.
