探討由Gluconacetobacter xylinum生產之細菌纖維素及其奈米化應用於吸附有機汙染物;Investigating the bacterial cellulose  production from gluconacetobacter xylinum  and its nanonization for heavy metal adsorption

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Title:	探討由Gluconacetobacter xylinum生產之細菌纖維素及其奈米化應用於吸附有機汙染物;Investigating the bacterial cellulose production from gluconacetobacter xylinum and its nanonization for heavy metal adsorption
Authors:	曾品堯;Tseng, Pin-Yao
Contributors:	化學工程與材料工程學系
Keywords:	木質醋酸菌;細菌纖維素;水解;Acetobacter xylinum;bacterial cellulose;hydrolysis
Date:	2022-08-22
Issue Date:	2022-10-04 10:59:42 (UTC+8)
Publisher:	國立中央大學
Abstract:	細菌纖維素（BC），是木質醋酸桿菌(Gluconacetobacter xylinum)的二次代謝產物。與植物纖維素相比有更好的結晶度，較容易生產的條件，同時也具有環境友善材料的特性，另外由於細菌纖維素其良好的生物相容性，保水率及具備網狀多孔的結構特性，目前在生物醫學、薄膜材料或食品方面有很多的應用，隨著近年來環保意識的抬頭，本研究決定將其奈米化後，用於水中有機汙染物的吸附。期望開發出一種環保的水處理方式。首先將菌種活化後接種至Buffered Schramm & Hestrins (BSH) broth中進行發酵，發酵條件比對了不同ph值、溫度及搖瓶轉速的發酵動力學參數，經過14天發酵後，都能在發酵液的氣液界面得到一層細菌纖維素薄膜。而最適合的環境為起始pH值3.5~4.4、溫度30˚C、搖床轉速75rpm或靜置，可以得到最大產物(Pmax)5.17 g/L、最大菌重(Xmax)8.17 g/L及葡萄糖對產物的轉換率(YP/S)0.69。而發酵完成後，為了將其奈米化，比較了兩種方式，化學及物理的水解，兩種方法都是消除纖維素中的無定型區域，提高結晶度，最後為了進一步提升吸附的效果，也選擇了兩種方案，一種是讓其表面以聚苯胺修飾，另一種是添加預處理過程，而分析的方式除了吸附實驗之外，也進行了XRD分析及保水能力測試，分別做為其結晶度和網狀孔洞的探討依據。而最後的結果顯示兩種水解方式都成功的消除纖維素中的無定型區域，且沒有破壞其結構，另外吸附的效果是經過聚苯胺改質的PANi-BCN有最好的表現，經過3分鐘後可讓甲基橙的濃度降到原本的20%，而雖然經過預處理的pre-BCN吸附效果不如PANi-BCN，但也能讓甲基橙的濃度降到原本的約30%，並且保留了其生物可降解的優點，做為一個有淺力的環境友善材料。;With the rising awareness of environmental protection in recent years, this study decided to use bacterial cellulose for the adsorption of organic pollutants in water after nanoization. First, the strains were activated and inoculated into Buffered Schramm & Hestrins (BSH) broth for fermentation. The fermentation conditions were compared with the fermentation kinetic parameters of different pH value, temperature and shake flask rotation speed. And The results show that the most suitable environment is the initial pH value of 3.5~4.4, temperature of 30˚C, shaker speed of 75 rpm or static, and the maximum product (Pmax) is 5.17 g/L, the maximum bacterial weight (Xmax) is 8.17 g/L and The conversion ratio of glucose to product (YP/S) was 0.69. After the fermentation, elimination of amorphous regions by hydrolysis. And finally, in order to further improve the effect of adsorption, two case were also chosen, one is to modify the surface with polyaniline, and the other is to add a pretreatment process . The final results showed that both hydrolysis methods successfully eliminated the amorphous region in cellulose without destroying its structure. In addition, the adsorption effect was that PANi-BCN modified by polyaniline had the best performance, after 3 minutes, the concentration of methyl orange can be reduced to 20% of the original, and although the adsorption effect of pre-BCN is not as good as PANi-BCN, it can also reduce the concentration of methyl orange to about 30% of the original, and retain its biodegradable advantage As a environmentally friendly material.
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] Electronic Thesis & Dissertation

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