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題名 | 摻雜ZIF-8之奈米碳纖維對二氧化碳的吸附效能研究=Adsorption of Carbon Dioxide on ZIF-8 Doped Carbon Nanofibers |
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作者姓名(中文) | 江右君; 秦偉庭; 黃志誠; 張瑞彤; | 書刊名 | 燃燒季刊 |
卷期 | 32:3=122 2023.08[民112.08] |
頁次 | 頁19-32 |
分類號 | 440.34 |
關鍵詞 | 奈米碳纖維; 靜電紡絲; 沸石咪唑框架; 二氧化碳; 吸附; Carbon nanofibers; Electrospinning; Zeolitic imidazolate frameworks; ZIFs; Carbon dioxide; Adsorption; |
語文 | 中文(Chinese) |
DOI引用網址 | 10.30041/CQ.202308_(122).0002 |
中文摘要 | 為了開發適合CO_2之吸附材料,本研究利用靜電紡絲技術,在polyacrylonitrile(PAN)奈米纖維中掺雜ZIF-8,接著經過穩定化、碳化和活化程序後,探討其材料特性及對CO_2之吸附效能。考慮兩種掺雜物形式:一是自行合成的ZIF-8、二是將ZIF-8製作成ZIF衍生碳(ZIF-derived carbon, ZDC);比較二者之差異;本研究也探討活化的影響。研究發現,有掺雜的樣本易在纖維上出現節點,仍屬於微孔性材料;而掺雜ZIF-8之樣本的纖維外形較捲曲。ZIF-8或ZDC-850的掺雜確實可提高纖維的比表面積和孔體積;活化過程可促進孔隙的發展,包含微孔、中孔和大孔範圍;但超微孔的發展應主要來自碳化階段。850°C下的活化會增加表面氧含量,也會使C、N原子的釋出,導致Zn的增加。在0°C、1 atm下,各樣本對CO_2的平衡吸附量分別為4.08(PAN)、3.94(ZIF-8/PANc)、4.88(ZIF-8/PANa)、3.63(ZDC-850/PANc)和4.75(ZDC-850/PANa)mmole/g。Freundliche quation可適當描述樣本之CO_2等溫吸附數據;Yoon和Nelson model也可用於擬合吸附貫穿數據,且證明樣本可再生重覆使用。此複合奈米碳纖維對CO_2之吸附效能可能來自多層次之多孔結構、表面官能基團和Zn金屬活性位置之間的交互作用;而Zn金屬活性位置、超微孔體積和C=N groups及Quaternary N or protonated N groups可能為主要影響因子。 |
英文摘要 | In order to develop the adsorbents for CO_2 capture, the electrospinning technique was used in this study to prepare ZIF-8 doped polyacrylonitrile (PAN) nanofibers, followed by stabilization, carbonization, and activation. The properties of the products were investigated and their adsorption capacities of CO_2 were discussed. Two dopents were considered: one was the home-made ZIF-8 and the other one was the ZIF-8 derived carbon (ZDC). The differences for both doped carbon nanofibers were compared and the effect of activation was also studied. Results show that the nodes occurred in the doped carbon nanofibers which were microporous materials. ZIF-8 doped samples exhibited a more curled morphology. The specific surface areas and pore volumes were improved for ZIF-8 or ZDC-850 doped fibers, compared with those of pure PAN fibers. The activation process promoted the formation of pores ranging from micropores, mesopores and macropores. In addition, the ultramicropores were mainly attributed to the carbonization process. It was observed that the activation at 850℃ brought to the increase in the surface oxides and made the release of carbon and nitrogen atoms resulting in the increase in zinc atoms. The CO_2 uptakes at 0℃、 1 atm were 4.08 (PAN)、 3.94 (ZIF-8/PANc)、 4.88 (ZIF-8/PANa)、 3.63 (ZDC-850/PANc) and 4.75 (ZDC-850/PANa) mmole/g. Freundlich equation could be used to fit the adsorption data of CO_2 isotherms. Yoon and Nelson model could fit the adsorption breakthrough curves well. Moreover, the cyclic 10 tests of breakthrough experiments demonstrated the samples prepared in this study could be regenerated and cyclic uses. The adsorption mechanisms of CO_2 on the doped PAN nanofibers were comprehensive interactions of hierarchical porous structures, surface functional groups, and the zinc active sites. Moreover, the zinc active sites, ultramicropore volume, C=N groups, and quaternary N or protonated N groups were the most significant parameters for CO_2 adsorption. |
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