| Summary: | 碩士 === 國立聯合大學 === 環境與安全衛生工程學系碩士班 === 104 === Different synthetic temperatures (70, 100 and 130℃) and reaction times (24 and 72 hours) are used to make SBA-15 of pore diameters, which is functionalized. The acrylate-based amine dendrimers is grafted by stepwise polymerization the functionalized SBA-15. The grafting efficiency of the absorbent and the absorption effect of carbon dioxide are discussed, and problems such as pore filling are improved.
The data of BET analysis shows that the pore diameter will increase from 3.55 nm to 7.91 nm as the hydrothermal temperature increases, and will also increase from 7.91 nm to 10.91 nm if the reaction time is additionally increased. However, the pore wall may break if the temperature or reaction time is too high or long. The FT-IR result shows the peak value that is not possessed by SBA-15 appears both sides of 2900 cm-1, 1500 cm-1, and 700 cm-1, which indicate SBA-15 is successfully functionalized. After grafting reaction, the amine content of the filtrate is determined by the titration. As for 70℃-SBA-15, the grafting efficiencies of G1 to G2 are increased from 11.67% to 12.50%, but they may decrease to 10.28% due to problems like pore filling after G3. The grafting efficiencies are the same for 100℃-SBA-15 and 70℃-SBA-15, but the grafting efficiencies of G1 to G3 are not decreased as for 130℃-SBA-15 and 130℃-3D-SBA-15 (130℃-SBA-15:10.30,11.42,11.76%,130℃-3D-SBA-15:9.77,10.82,11.60%), which indicate the pore filling is improved. The fixed-bed reactor is used to simulate flue gas by carbon dioxide adsorption at room temperature and the regeneration of adsorbent. The test data shows that the adsorption capacity of 130℃-SBA-15/G3 is maximum (82.25 mg/g), and the cyclic adsorption capacity of 100℃-SBA-15/G2 is respectively 65.80, 63.26, 61.53, 62.71, and 64.8 mg after adsorption and desorption for 5 times.
The study finds that the specific surface area and the pore diameter affect the grafting efficiency, the graftable number and the adsorption capacity of carbon dioxide. The pore diameter and the grafting number can be effectively increased, and the pore filling can be improved by increasing the hydrothermal temperature and the synthetic time. As a result, the adsorption capacity is increased, the reusability of adsorbent is increased, and the cost for treating carbon dioxide is decreased.
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