衣康酸改質幾丁質之吸附劑應用於吸附環境中有害物質之研究

本研究是以衣康酸(IA)改質幾丁質(Chitin)製作吸附劑，再進行吸附巴拉刈、甲基紫，及孔雀綠等毒性有機離子。以Ce4+做為氧化還原起始劑，進行接枝共聚合反應，使得衣康酸接枝在幾丁質的主鏈上。實驗變數為IA克數、Ce4+濃度，及溫度的改變。經傳統的實驗方法，獲得最高接枝比配方為IA 2.0g、Ce4+ 0.1M，及溫度30˚C，可製得92.9%接枝百分比之Ch-g-PIA 共聚合物。再利用CCD(Center composite design) 實驗統計法，另可求得最佳配方為IA 3.0g、Ce4+ 2.79M，及溫度20˚C，依此配方計算，可製成116%接枝百分比之Ch-g-PIA共聚合物。實驗結果之接枝百分比為116±1%，與理論計算值接近。取用此最佳配方製得之Ch-g-PIA，以FT-IR光譜分析，確定在幾丁質的結構上含有衣康酸的羧酸基。Ch-g-PIA再經水解形成鈉鹽的形式後，進行吸附巴拉刈、甲基紫，及孔雀綠。吸附反應初期速率極高，在20分鐘左右即可達到平衡。吸附等溫線的結果顯示Langmuir比Freundlich模式更適合描述吸附行為。

關鍵字

幾丁質；衣康酸；接枝共聚合；巴拉刈；甲基紫；孔雀綠

並列摘要

Chitin（Ch）grafted poly itaconic acid (IA) was synthesized and characterized to obtain a new adsorbent（Ch-g-PIA）of toxic organic ion such as paraquat, methyl violet, and malachite green etc. The Ch-g-PIA copolymers were prepared at various concentrations of Ce4+、（IA/Ch）ratio and temperature to find the copolymerization recipe of highest grafting percentage by using of traditional technique. The obtained recipes and grafting percentage of copolymer are 0.1M [Ce4+]、2.0（IA/Ch）ratio、30˚C and 92.9%,respectively. However, the CCD (Center composite design) was also applied to find the optimum recipes in the system. They are 2.79M [Ce4+]、3.0（IA/Ch）ratio and 20˚C. The calculated grafting percentage of copolymer from CCD increases to 116%, which is consistent with the experimental results（116±1%）. The grafting copolymerization was confirmed by FT-IR spectra. A representative Ch-g-PIA copolymer was hydrolyzed to a salt type and applied to the adsorption of paraquat etc. The adsorption time to reach equilibrium was about 20 minutes. The adsorption equilibrium data correlate closely with the Langmuir than the Freundlich isotherms. The maximum adsorption capacity, qm, calculated of paraquat is156.8mg/g-adsorbent. This value of paraquat for Ch-g-PIA exceeds those for Fuller’s earth and activated carbon, which are the most common binding agents currently used for paraquat. The results suggest that Ch-g-PIA has potential use as a paraquat adsorbent.

並列關鍵字

Chitin ； Itaconic acid ； Graft copolymerization ； Paraquat ； Methyl violet ； Malachite green

參考文獻

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衣康酸改質幾丁質之吸附劑應用於吸附環境中有害物質之研究

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