應用聚乙烯亞胺改質無機聚合物吸附二氧化碳 之可行性研究;Feasibility of Polyethyleneimine-Modified Geopolymers for Carbon Dioxide Adsorption

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題名:	應用聚乙烯亞胺改質無機聚合物吸附二氧化碳之可行性研究;Feasibility of Polyethyleneimine-Modified Geopolymers for Carbon Dioxide Adsorption
作者:	黃佳瑩;Huang, Jia-Ying
貢獻者:	環境工程研究所
關鍵詞:	無機聚合物;胺改質;二氧化碳吸附;geopolymers;amine modification;carbon dioxide adsorption
日期:	2026-01-28
上傳時間:	2026-03-06 19:07:34 (UTC+8)
出版者:	國立中央大學
摘要:	本研究探討焚化再生粒料(Aged bottom ash, ABA)、淨水污泥與偏高嶺土 (Metakaolin)製備為無機聚合物之可行性，並利用酸及胺改質技術改變無機聚合物表面特性，評估改質後無機聚合物吸附二氧化碳之可行性。試驗條件分別包括改變焚化再生粒料添加量(10-40 wt%)、氫氧化鈉濃度(4-8 M)及液固比(0.65-0.85)之無機聚合物製備條件，以及硝酸濃度(0.2-0.6 M)及聚乙烯亞胺(Polyethyleneimine, PEI)附載量(10-30 wt%)等酸及胺改質條件。研究結果顯示，40 wt%焚化再生粒料添加量 40 wt%與 10 wt%淨水污泥及 50 wt%偏高嶺土之摻混比例，在氫氧化鈉濃度 8 M 及液固比 0.65 之試驗條件，經 25 ℃及相對濕度 60%養護 28 天，製備之無機聚合物有最高之抗壓強度 67.0±22.6 kgf/cm2。前述符合抗壓強度之無機聚合物，經研磨至小於 1 mm 後，以 0.2 M 硝酸與液固比 20:1 之條件攪拌一小時進行酸改質。試驗結果顯示，酸改質後試樣之比表面積為 173.5 m2 /g，孔體積為 0.31 cm3 /g，以 XRD 鑑定分析結果顯示，酸改質前後對試樣並未有晶相改變，亦即酸改質條件僅去除試樣表面雜質及未反應矽、鋁元素，並未改變無機聚合物整體結構。經以 PEI 進行胺改質後之無機聚合物，進行二氧化碳吸附試驗，結果顯示在控制二氧化碳流量 100 mL/min，吸附溫度 50 ℃及吸附時間 3 小時條件下，製備含 30 wt% PEI 之無機聚合物，二氧化碳吸附量最大可達 0.93±0.06 mmol/g，稍較未改質無機聚合物之吸附量 0.89±0.06 mmol/g 為高，顯示胺改質劑(PEI)有助於提升二氧化碳之吸附能力。整體而言，本研究初步驗證 PEI 改質之無機聚合物，具有提升二氧化碳之吸附能力，然後續可再進一步評估以不同胺改質技術，促進無機聚合物應用於二氧化碳吸附劑之應用潛力。;This study investigated the feasibility of synthesizing geopolymer using aged bottom ash (ABA), drinking water treatment sludge, and metakaolin, and evaluated the potential of acid-modified and amine-modified geopolymer for carbon dioxide adsorption by altering geopolymers′ surface properties. The experimental conditions included variations in ABA content (10-40 wt%), sodium hydroxide concentration (4-8 M), and liquid-to-solid ratio (0.65–0.85) for geopolymer synthesis, as well as nitric acid concentration (0.2-0.6 M) and polyethyleneimine (PEI) loading (10-30 wt%) for acid and amine modification. The results indicated that the geopolymer prepared with a mixture of 40 wt% ABA, 10 wt% drinking water treatment sludge, and 50 wt% metakaolin, under a sodium hydroxide concentration of 8 M and a liquid-to-solid ratio of 0.65, exhibited the highest compressive strength of 67.0 ± 22.6 kgf/cm² after 28 days of curing at 25 °C and 60% relative humidity. The geopolymer meeting the compressive strength requirements were ground to a particle size of less than 1 mm and subjected to acid modification using 0.2 M nitric acid at a liquid-to-solid ratio of 20:1 for 1 hour. After acid modification, the sample′s specific surface area and pore volume increased to 173.5 m²/g and 0.31 cm³/g, respectively. X-ray diffraction (XRD) analysis showed no phase changes before or after modification, indicating that the acid treatment primarily removed surface impurities and unreacted silicon (Si) and aluminum (Al) without altering the overall structural integrity of the geopolymer. Subsequent carbon dioxide adsorption tests on the PEI-modified geopolymer was conducted under a carbon dioxide flow rate of 100 mL/min and an adsorption temperature of 50℃ for 3 hours. The results showed that the geopolymer with a 30 wt% PEI loading achieved a maximum carbon dioxide adsorption capacity of 0.93±0.06 iv mmol/g, which is slightly higher than the 0.89±0.06 mmol/g observed for the unmodified sample. Overall, this study preliminarily validates that PEI-modified geopolymer can enhance carbon dioxide adsorption capacity. Future research could further evaluate different amine-modification techniques to enhance the potential of geopolymer as carbon dioxide adsorbents.
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