Adsorption properties of CO2 on iron-impregnated bamboo biochar
The important role of the pore structure and alkaline functional groups of the adsorbent in CO2 capture process is analyzed.In order to improve the adsorption performance of biochar,iron-impregnated biochar is obtained by using Fe(OH)3 as the precursor,and the CO2 adsorption properties are studied.The results show that Fe2O3 is successfully loaded in biochar,both the specific surface area and micropore volume of iron-impregnated biochar are increased.When the adsorption temperature increases from 0 ℃ to 25 ℃,the adsorption capacity will decrease by 57.37％-50.42％,and the adsorption of CO2 on biochar is an exothermic process.Linear correlation analysis show that the specific surface area and the micropore volume are the key factors affecting the CO2 adsorption capacity.Both Avrami model and Langmuir model can well fit the adsorption process of CO2 on biochar,which indicate that the CO2 adsorption on biochar is mainly monolayer adsorption with combining physical and chemical mechanisms.Iron-impregnated biochar is a potential CO2 adsorbent.
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