幾丁聚醣-三聚磷酸螫合型樹脂對二價銅離子之吸附研究

The Adsorption of Copper(lI) Ion on Chitosan-tripolyphosphate Chelating Resin

糜福龍(Fwu-Long Mi) ； 李松濤(Sung-Tao Lee) ； 沈玉如(Yu-Ju Shen)

《化學》 57卷1期 (1999/03) Pp. 11-24

https://doi.org/10.6623/chem.1999002

摘要

本研究中以液相凝膠程序成功的合成離子交聯的球狀幾了聚醣-三聚磷酸螫合型樹脂，並將其應用於水溶液中重金屬離子之吸附。幾丁聚醣樹脂小球之交聯特性可藉由液相凝膠程序之改變而改良之；在三聚磷酸溶鞭之pH值低於6以下時，幾丁聚醣之凝膠機制屬於離子交聯控制；而在三聚磷酸溶液之pH值為8.6 時(大於pH7)，幾丁聚醣之凝膠機制則是與pH值相關之凝膠機制。銅離子吸附於幾丁聚醣樹脂小球之反應機制為螫合反應而非離子交換。幾丁聚醣-三聚磷酸螫合型樹脂對溶液中銅離子之吸附效果，隨著銅離子溶液pH值之降低而減低。由銅離子吸附實驗數據及能量散布(EDS)分析顯示，吸附動力學模式符合Fickian擴散動力學模式，而吸附等溫線則符合Langmuir模式。

關鍵字

幾丁聚醣 ； 三聚磷酸 ； 離子交聯 ； 吸附

並列摘要

Spherical chitosan-tripotyphosphate (TPP) chelating resin are successfully synthesized by an in-liquid ionotropic crosslinking method, and then is employed to examine its uptaking ability for copper(lI) ion. Crosslinking characteristics of the chitosan-TPP beads were improved by the modification of in-liquid curing mechanism of the beads in TPP solution. Chitosan gel beads cooed in pH value lower than 6 was really ionic-crosshnking controlled, whereas, chitosan gel beads curied in pH 8.6 (higher than pH7) was pH-dependent coacervation. The parameters studied in copper(U) ion adsorption including pH values, swelling effect, and initial copper(II) ion concentrations. Adsorption equilibrium and kinetics of copper(ll) ion on this chelating beads is also investigated to examine the correlations with the Langmuir isotherm model.

並列關鍵字

Chitosan ； Tripolyphosphate ； Ionic crosslinking ； Adsorption