在這提倡綠色化學的時代，從廢燃料之處理、材料製造、半導體加工廢液 處理等，都在節省有機溶劑之使用以及降低設備之空間，此已成為必然趨勢。
超臨界二氧化碳的應用亦越來越受到重視，亦有許多工業化及商業化之實際應 用。核廢料中仍含有放射性物質，對於環境或生物體皆具有威脅性，而後續廢 溶液儲存堆置耗佔空間，每年都須耗費高額之處理成本。目前，已有研究為利 用超臨界二氧化碳流體，取代傳統之有機溶劑來進行鈾金屬萃取，於收集過程 當中，CO2洩壓即可氣化而與萃取物進行分離，達到濃縮效果而無需處理有機 廢溶劑。
本實驗以環保冷媒HFC-134a 取代 SF-CO2，其具有超臨界二氧化碳於操作 上之些許優點，包括濃縮、可回收重複使用之特性，同時HFC-134a 比 SF-CO2 大幅降低操作時的壓力，以提高安全性。本研究證實先將螯合劑結合硝酸，溶 解於冷媒 HFC-134a 後，於固相基質中可直接萃取鈾金屬，其中，以有機磷試 劑TBP 所得之萃取效果最好，而螯合劑 TBP 與硝酸結合後亦擁有螯合金屬之 能力，且使用冷媒HFC-134a 之情況下，硝酸亦保有其氧化之能力，可將 U（IV）
氧化成為 U（VI）。另外，亦可去除大量硝酸之使用，確實可達到安全性，經 濟且有效率地回收。目前，可利用於HFC-134a 的螯合劑，慢慢地被開發出來，
只要將HFC-134a 有效地回收再利用，相信其應用價值是相當可觀的。
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附錄一
附錄二
HFC-134a 密度變化圖
bar
T 288.15K 293.15K 298.15K 303.15K 10 1245.1 1227.1 1208.4 1189.0 15 1247.8 1230.0 1211.6 1192.5 20 1250.3 1232.8 1214.7 1195.9 25 1252.8 1235.5 1217.6 1199.1 30 1255.3 1238.2 1220.5 1202.3
附錄三
不鏽鋼攪拌槽
附錄四
（a）TBP NMR 圖譜
（b）HNO3-TBP NMR 圖譜
附錄四
（c）TBPO NMR 圖譜
附錄四
（e）TOPO NMR 圖譜
（f）HNO3-TOPO NMR 圖譜
附錄四
（g）HDEPH NMR 圖譜
附錄四
（i）1-Benzoylacetone NMR 圖譜
（j）1-Benzoylacetone-TBP NMR 圖譜
附錄五
（a）TBP EI-MS 圖譜
（b）HNO3-TBP EI-MS 圖譜
附錄五
（c）TBPO EI-MS 圖譜
（d）HNO3-TBPO EI-MS 圖譜
附錄五
（e）TOPO EI-MS 圖譜
（f）HNO3-TOPO EI-MS 圖譜
附錄五
（g）HDEPH EI-MS 圖譜
（h）HNO3-HDEPH EI-MS 圖譜
附錄五
（i）1-Benzoylacetone EI-MS 圖譜
（j）1-Benzoylacetone-TBP EI-MS 圖譜