Abstract
The waste ion-exchange resin–based activated carbon (WIRAC) was utilized for CO2 adsorption. The effect of adsorption temperature, gas flow, CO2 concentration, and adsorbent filling content on CO2 adsorption properties of WIRAC and the effect of desorption temperature and sweep gas flow on CO2 desorption performances of WIRAC were researched. In the adsorption process, with the increase of adsorption temperature, the CO2 adsorption capacity and adsorption rate decrease; as the gas flow increases, the CO2 adsorption capacity decreases, but the adsorption rate increases; with the increase of CO2 concentration and adsorbent filling content, the CO2 adsorption capacity and adsorption rate both increase. In the desorption process, the higher the desorption temperature and the smaller the sweep gas flow, the higher the CO2 purity of product gas and the longer the desorption time. In order to make sure the adsorbent be used efficiently and the higher CO2 concentration of product gas, the adsorption and desorption conditions selected should be a suitable choice.
Highlights
Since the 20th century, the rising required energy and ecological and environmental problems caused by the pollution and overuse of resources have significantly threatened the existence and development of human beings with the rapid development of the global economy
The pore structure parameters can be calculated by the N2 adsorption–desorption isotherm
The original contributions presented in the study are included in the article/Supplementary Material, and further inquiries can be directed to the corresponding author
Summary
Since the 20th century, the rising required energy and ecological and environmental problems caused by the pollution and overuse of resources have significantly threatened the existence and development of human beings with the rapid development of the global economy. The waste ion-exchange resin–based activated carbon (WIRAC) has been produced to be utilized for sewage treatment (Bratek et al, 2002; Gun’ko et al, 2005), naphthalene adsorption (Shi et al, 2013), and highperformance supercapacitors (Zhang et al, 2013), but to the best of our knowledge, there is no one using the WIRAC to separate CO2 from flue gas. In our previous work (Wei et al, 2016), we have researched the effect of preparation parameters on the pore structure of WIRAC and the preliminary adsorption properties of WIRAC by TGA. The effect of adsorption temperature, gas flow, CO2 concentration, and adsorbent filling content on CO2 breakthrough and adsorption capacity of WIRAC was researched. Where mreg is the CO2 adsorption capacity of the regenerated WIRAC and m1 is the CO2 adsorption capacity of the fresh WIRAC
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