چكيده به لاتين
ABSTRACT
In the present study, hollow silicate spherical nanoparticles (HSSP) were synthesized in a single step by Precipitation process with the aim of adsorbing carbon dioxide gas. The silicate product is characterized by various standard identification techniques and its structure is confirmed. The adsorption process was performed by a volumetric method at different temperatures (298, 323 and 348 K), and the adsorption capacity of HSSP for carbon dioxide gas was 7.71 mmol g-1. In addition, the selectivity of nano adsorbent prepared for carbon dioxide gas was investigated compared to nitrogen and methane gas streams. Amine-functionalized carbon nanotubes were used to increase the adsorption capacity and improve the selectivity of synthetic nano silicate adsorbents.The nanocomposites were synthesized in a single step by Precipitation process by with two different amounts of amine-functionalized carbon nanotubes (0.15 and 0.3 g) and characterized. The absorption capacity and selectivity of nanocomposites was also determined for carbon dioxide gas compared to nitrogen and methane gases. Nanocomposite modified with 0.15 grams of amine-functionalized carbon nanotubes has an adsorption capacity of 12.52 mmol g-1 and a sample containing 3 grams of amine-functionalized carbon nanotubes has an adsorption capacity 13.80 mmol g-1 for carbon dioxide gas. Improve the absorption capacity of nanocomposites due to the presence of carbon nanotubes and amine groups. Carbon nanotubes increase the structure and increase the surface, and amine groups are also the high affinity and interaction between the amine groups and acidic gas. In addition, a value of 1.92 % was calculated for RSD, which indicates the accuracy of the data obtained from the absorption process using optimal nanocomposite.
Keywords: Carbon dioxide, adsorption, Hollow silicate spherical nanoparticle adsorbent, Nanocomposite, amine-functionalized carbon nanotubes
