Experimental Study Of The Preparation And CO₂Adsorption Properties Of The Ion Exchange Resin Based Spherical Active Carbon

Since human activities emit large quantities of CO2, which has a profound impact on the global climate and environment, the CO2emission reduction techniques cause widespread concern, especially the recently springing-up CO2capture and storage technology(CCS).This study chosen waste ion exchange resin as a raw material to protect spherical activated carbon, which has a certain adsorption capacity. In this way, we can not only solve the environmental pollution problem caused by the waste ion exchange resin accumulation, but also make the activated carbon preparation cost reduction. While we also make surface modification of the spherical activated carbon and study its CO2adsorption behavior.The results indicate that:(1) Through the TGA experiments, we can get the temperature pyrolysis curve of the ion exchange resin, and get the characterization of surface structure and material specific surface, through the above researches, we can confirm the carbonization temperature is800℃and the carbonization time is60min.Through the activation experiment, we can get that with the increase of activation temperature, activation time, ion exchange resin based spherical activated carbon’s specific surface area first increases and then decreases.(2) We use ammonia to impregnate ion exchange resin’s and make it surface modified. Compared the content of ion exchange resin’s surface functional groups before and after modification of ion exchange resin, we can get that after modified the basic functional groups on the surface of the activated carbon increased. The activated carbon get more developed pore structure. The specific surface area and pore volume increases. The proportion of microporous and large pore in activated carbon increases. The average pore size changes slightly.(3) Before modification, the CO2adsorption capacity has the nature of adsorption at low temperature and desorption at high temperature. At26℃, the amount of CO2saturation adsorption reaches50mg/g, the saturated adsorption time reaches about5min. With the adsorption temperature rising, the CO2adsorption quantity of the modified spherical activated carbon first increases and then decreases. At125℃, the adsorption quantity can reach300mg/g. With the decreasing of the partial pressure of CO2, the CO2adsorption quantity of the modified spherical activated carbon decreases. By studying the desorption behavior of modified spherical activated carbon in different temperature, the chemical adsorption take up70%.