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題名 | 幾丁聚醣圓珠吸附銅離子之研究=Adsorption of Copper Ion on Chitosan Gel Beads |
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作者 | 董崇民; 廖建棠; 鄭敬賢; | 書刊名 | 明志技術學院學報 |
卷期 | 32 2000.06[民89.06] |
頁次 | 頁117-122 |
分類號 | 346.217 |
關鍵詞 | 幾丁聚醣; 銅離子; 戊二醛; 水膠; 吸附; Chitosan; Copper ion; Glutaldehyde; Hydrogel; Adsorption; |
語文 | 中文(Chinese) |
中文摘要 | 幾丁聚醣為一天然高分子,由於擁有大量的胺基、羥基等官能基,因此可以吸附 廢水溶液中的金屬離子。然而由於吸附量受到擴散速率的控制,因此若能製成水膠形態,擴 張高分子鏈結構,可增進吸附面積和加強擴散機制,以提高金屬離子吸附量。另外,為了增 加水膠的機械性質和耐化學藥品性,利用戊二醛溶液將水膠表面交聯起來。實驗發現 Cu �� 吸附量和 pH 值及戊二醛交聯程度有關;最高可達 78 ppm/g 的吸附量。而最適合的 pH 值 範圍是在 3 左右, 可能是由於在此 pH 值可以得到最適合的鏈展開程度和胺基質子化的組 合,進而達到最佳的錯合和螫合能力。實驗顯示吸附動力是由水膠內之擴散來控制。 |
英文摘要 | Chitosan is a natural polymer, which can be used to reduce dramatically the amount of transition metal ions in the wastewater. This is because the amino and hydroxyl groups in the chitosan molecules can form complex and/or chelates with the metal ions. Yet, the adsorbed amount of the metal ions is limited to the diffusion control. Therefore, it is the purpose of this study to increase the diffusion rate and the adsorbed amount by converting the chitosan flake to the hydrogel bead in order to expand the chain structure. In the mean time, the chitosan gel beads were pre-treated with the glutaldehyde to have lightly crosslinked structure, thus increasing their mechanical properties and the resistance to the chemicals. The experimental results showed that the adsorbed amount of copper ion was dependent on the pH and the glutaldehyde amount, where the maximum adsorbed amount was about 80 ppm/g. The optimum pH value was found to be at 3. This was attributed to the best combination of the chain conformation and the protonation of the amino groups at this pH value. The adsorption kinetics was controlled by the external film diffusion and the pore diffusion inside the gel beads. |
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