探討生物聚醣三仙膠在生物吸附程序的應用

Evaluate the Bacterial polysaccharide of Xanthan Cum for the Application of Biosorption Processes

林怡雅(Yi-Ya Ling)

指導教授 ： 鍾財王

中原大學/工學院/化學工程研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500218

摘要

生物聚醣(polysaccharide)三仙膠(Xanthan gum)是由菌株Xanthomon campestris進行好氣性發酵所產生的。三仙膠具有特殊的流變性質，最常應用於食品及醫藥化妝品業，但由於三仙膠的結構式中含葡萄糖醛酸和末端的丙酮酸分子，使得三仙膠具陰離子特性，因此也會對金屬陽離子造成吸引的作用。應用此特性，本實驗以商業化之三仙膠進行銅、鉛、錳之吸附，取得其等溫吸附平衡曲線。實驗結果發現，在25℃金屬水溶液pH值大約為5時，三仙膠對金屬的最大吸附量，分別為銅57.221 mg/g，鉛44.555 mg/g，錳8.21 mg/g。吸附性能順序為Cu >Pb >Mn，這與金屬離子陰電性和半徑有關，也與吸附材本身性質有關，因此每一種吸附材都會有其吸附順序的特異性。實驗數據使用Langmuir isotherm迴歸，其迴歸情形良好。以生物聚醣吸附法進行金屬水溶液的處理，符合綠色製程的概念，不僅降低了環境的汙染，也減少了能源與原料的損耗。

關鍵字

共價性指標 ； 三仙膠 ； 生物聚醣 ； 重金屬 ； 生物吸附

並列摘要

Xanthan gum is a polysaccharide produced by the xanthomon campestris fermentation process. Due to the special rheological properties, the xanthan gum is usually used in food industry, pharmaceutical and cosmetics. Xanthan gum can attract cation because its backbone is similar to the cellulose and its side chain contains mannose and glucuronic. In this study the commercial xanthan gum was used as a biosorbent to investigate the adsorption capacity of Cu(II), Pb(II), and Mn(II). The maximum sorption capacity calculated by applying the Langmuir equation to single ion adsorption isotherms was 57.221 mg/g for Cu2+, 44.555 mg/g for Pb2+ and 8.21 mg/g for Mn2+ at 25℃ (pH=5). The affinity order of three metal ions adsorbed by xanthan gum is Cu2+ >Pb2+ >Mn2+. It is because the potential of a metal ion to complex a ligand depends on its electronegativity, ionic radius and adsorbent property. As noted that each sorbent has different affinity order for ions. The biosorption is a “green process”, which can reduce environment pollution, energy loss and raw material waste.

並列關鍵字

biosorption ； xanthan gum ； polysaccharide ； covalent index ； heavy metal

參考文獻

【42】Randall JM, Bermann RL, Garrett V and Waiss ACJr. Use of bark to remove heavy metal ions from waste solutions. Forest Products Journal 1974;24(9):80-84

【3】Garcia-Ochoa F, Santos VE and Casas JA. Xanthan gum production under several operational conditions:molecular structure and rheological properties. Enzyme Microbial Technology 2000;26:282-291

【4】Katzbauer B. Properties and applications of xanthan gum. Polymer Degradation Stability 1998;59:81-84

【5】Lopez MJ and Ramos-Cormenzana A. Xanthan production from olive- mill wastewaters. International Biodeterioration and Biodegrada- tion 1996;38: 263-270

【6】Chandrasekaran R and Radha A. Molecular modeling of xanthan: galactomannan interactions. Carbohydrate Polymers 1997;32:201-208