去乙醯度對固定化膠態幾丁聚醣吸附重金屬離子之影響

Effect of degree of deacetylation on the adsoroption of heavy metal ion by immobilized chitosan gel

謝承祐(Cheng-Yu Heish)

指導教授 ： 錢偉鈞

朝陽科技大學/理工學院/應用化學系/碩士(2012年)

摘要

本研究使用不同去乙醯度(85%、99%)幾丁聚醣，塗佈於不織布(Polypropene) 表面，以了解不同去乙醯度幾丁聚醣對於重金屬離子的吸附能力。由於不織布具高孔隙度，將膠態幾丁聚醣塗佈於不織布之上，對於重金屬離子之吸附，可提供較大之吸附面積。本研究進行系列之吸附實驗，將Cu+2、Cd+2、Cr+3、Pb+2等四種常見之有害重金屬離子溶於水中，在室溫下進行90分鐘之吸附實驗。實驗結果顯示，上述重金屬離子之吸附速率均相當快速，約在十分鐘內，即趨於平衡。兩種去乙醯度之幾丁聚醣塗佈及不織布之片數，重金屬吸附量的趨勢皆為一致(Cu+2＞Cd+2＞Pb+2＞Cr+3)，而增加不織布之片數對四種重金屬離子之吸附量皆有增加效果；去乙醯度增加對Pb+2的吸附量有較明顯提升，對Cd+2與Cr+3則有些微提升，但對Cu+2的吸附無明顯影響。使用膠態幾丁聚醣塗佈之不織布，吸附廢水中重金屬離子，因吸附速率高，而滯留時間短，可增加反應器單位體積之效率，十分具有應用價值。

關鍵字

去乙醯度 ； 幾丁聚醣 ； 吸附速率 ； 重金屬離子

並列摘要

This research used chitosan of different degree of deacetylation (85, 99%) and coated, in its gel form, on the surface of polypropene non-woven cloth. The purpose was to understand the effect on the coated cloths’ adsorption capability for heavy metal ions. Since non-woven cloth is highly porous, coating gelled chitosan on its surface may provide large surface for heavy metal ion adsorptions. This research carried out series of adsorption experiments. The four commonly encountered heavy metal ions in the industrial waste water, Cu+2、Cd+2、Cr+3、Pb+2 were dissolved in water, and adsorption kinetics was observed in water for 90 min. For all of the above listed heavy metal ions, the adsorption equilibriums were developed within 10 min. Comparing the adsorption rate and capacity, the sequential order was Cu+2＞Cd+2＞Pb+2＞Cr+3. Using two kinds of deacetylation of chitosan coating and various of non-woven cloth, the trends are consistent with the amount of heavy metal adsorption (Cu+2> Cd+2> Pb+2> Cr+3), and increased number of non-woven piece would increase the effect of heavy metals adsorption; Increase the degree of deacetylation of chitosan would significantly increase the adsorption of Pb+2 ion, slightly enhanced the adsorption toward Cd+2 and Cr+3, and almost no effect upon the adsorption of Cu+2. The volumetric efficiency can be increased because of this. Thus the chitosan coated non-woven cloth has potential applications in waste water treatment.

並列關鍵字

deacetylation ； chitosan ； heavy metal ions ； adsorption rate

參考文獻

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