請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/5669
標題: 奈米零價鐵複合活性碳處理三氯乙烯污染物之評估
Evaluation of activated carbon supported nanoscale zero valent iron for treating trichloroethylene
作者: 蘇致綱
Su, Chih-Gang
關鍵字: Groundwater contamination
地下水污染
Chlorinated solvent
Zero valent iron
Adsorption
Permeable reactive barrier
氯化有機溶劑
零價鐵
吸附
透水性反應牆
出版社: 環境工程學系所
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摘要: 三氯乙烯(TCE)為土壤及地下水中常見之有機氯化溶劑污染物,屬比水重非水相液體,若意外洩漏至地表下,將成為土壤與地下水長期之污染源。透水性反應牆(PRB)為一被動式之土壤及地下水污染整治方法,零價鐵(ZVI)與活性碳(AC)為PRB廣泛採用之填充材質,其中ZVI可藉由表面與污染物接觸,對TCE進行還原脫氯反應,以達到降解污染物之目的,且其反應性與表面積呈正相關。此外AC則藉由其多孔隙與具多種表面官能基之特性,可經物理及化學性吸附,將污染物移除。本研究嘗試將奈米級零價鐵(nZVI)披覆至活性碳上,並對於此複合材料其結合吸附及還原反應用以處理TCE污染之效能進行評估。 實驗結果顯示,使用硼氫化鈉還原法將nZVI披覆至AC上為一可行之製備程序,且經掃描式電子顯微鏡分析,得知不同鍛燒溫度下所製備得之複合材料上nZVI之粒徑約為50-100nm;此外分散劑聚乙二醇於製備程序中之使用,對於nZVI粒徑大小並無明顯影響,但可得較佳之nZVI於AC上之分散性。nZVI/AC複合材料降解TCE所生成之降解產物氯離子與僅nZVI存在下所得之結果相較,可知複合材料具較佳之Cl-生成程度;反應過後之複合材料,可藉由熱碳還原法予以再生利用,提供此複合材料回收再利用之方法。
Chlorinated solvents such as trichloroethylene (TCE) are among the most common soil and groundwater contaminants. If TCE, as a dense non-aqueous phase liquid, is accidently released in the subsurface, its presence would become a continuous source of contamination. Permeable reactive barrier (PRB) is a passive technology for in situ clean-up of groundwater contamination. Among reactive materials filled within PRB, zero valent iron (ZVI) and activated carbon (AC) are widely used reactive materials. ZVI undergoes reductive dechlorination of TCE when containments are in contact with ZVI surface. Therefore, specific surface area of ZVI is highly correlated with high reactivity. In addition, AC with high surface area and multiple surface functional groups is a good adsorbent for removing contaminants. In this study, a process of coating nano zero valent iron (nZVI) onto AC, namely nZVI/AC, was developed. Then evaluation of the synthesized nZVI/AC composites for remediating TCE contamination was conducted. The results present a successful approach of combining impregnation and borohydride reduction to synthesize nZVI/AC composites. SEM analysis demonstrates that the size of nZVI on AC synthesized under different calcined temperatures is about 50-100 nm. Furthermore, the addition of polyethylene glycol dispersant for preparation of nZVI/AV reveals no effect on nZVI particle size. However, a well dispersion of nZVI on AC is achieved. When comparing nZVI/AC to nZVI on degradations of TCE, nZVI/AC reveals higher percentage of dechlorination than using nZVI only. The used nZVI/AC composites can then be regenerated by carbothermal reduction process which can be an effective method to regenerate the synthesized nZVI/AC composites.
URI: http://hdl.handle.net/11455/5669
其他識別: U0005-1407200913394200
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-1407200913394200
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