本研究分為三部分討論，透過循環經濟為導向去毒化含砷化鎵切削油。第一部分透過田口方法針對濕式冶煉的四個因素，溫度、硝酸濃度、硫酸濃度、硝酸及硫酸比例進行探討，確認提升冶煉效率的關鍵影響因子。結果顯示硝酸濃度影響最大，硫酸濃度次之，溫度的影響位居第三，硝酸及硫酸比例影響最小。為考慮製程安全及降低冶煉試劑及能源使用，溫度降低至45 °C且切削油及冶煉試劑比例為5:2時，15分鐘內即可使切削油中砷濃度降至1 ppm以下。
　　第二部分使用貴金屬萃取劑二(2-乙基己基)磷酸酯(D2EHPA)，並以去毒化切削油做為稀釋劑萃取冶煉後酸劑中的鎵。結果顯示萃取劑濃度0.5 M、萃取環境在pH 2.0，萃取試劑體積為冶煉試劑的兩倍時有鎵有最佳萃取效率，並以萃取劑3倍體積的4 N HCl反萃取，總萃取率可達91.1 %。再以硫化鈉做為砷的選擇性沉澱試劑，在砷硫比1:1.8時反應1.5小時，可生成三硫化砷沉澱並回收，且砷含量降至1 ppm以下。
　　第三部分使用去毒化後切削油加入乙二胺四乙酸(EDTA)，在濃硫酸環境下以120 °C強酸氧化法裂解15分鐘，可獲得氮、硫共摻雜碳量子點。實驗顯示，此碳量子點材料以330 nm紫外光照射時，具有最強的放光強度，其量子產率為2.3 %，並且在pH 2.0-11.0皆有相當好的穩定性。此碳量子點材料對於Fe3+具有相當好的專一性淬滅現象及良好的線性關係(R2:0.9973)，可應用於環境水質檢測，並具有相當良好的回收率(井水Fe3+ 回收率:105.8 %，自來水Fe3+ 回收率:102.4 %)。

　This study is divided into three parts. Through the circular economy as a guide to detoxifying GaAs-containing cutting oils. First, affecting factors of hydrometallurgy, such as temperature, the concentration of nitric acid, the concentration of sulfuric acid, and the volume ratio of nitric acid and sulfuric acid were studied by Taguchi method. The results showed the concentration of nitric acid had the greatest impact, the concentration of sulfuric acid was the second, the temperature was the third, and the ratio of nitric acid and sulfuric acid had the smallest impact. Considering process safety and reducing the use of reagents and energy, when the temperature was reduced to 45 °C and the volume ratio of cutting oil and reagents was 5:2 the arsenic concentration in the cutting oil could be reduced to less than 1 ppm in 15 minutes.
　　Then, the extractant D2EHPA was selected and the detoxified cutting oil was used as a diluent to extract gallium from the waste reagent. The results showed that the extractant concentration was 0.5 M at pH 2.0, and the volume of the extractant was twice of the waste reagent. The 4 N HCl re-extraction with 3 times the volume of the extractant showed that the total extraction efficiency was 91.1 %. Na2S was used as arsenic-selective precipitation reagent. It could completely recycle arsenic and reduce the arsenic concentration to less than 1 ppm when the molar ratio of arsenic and sulfur is 1:1.8.
　　Finally, N, S co-doped CQDs could be synthesized by pyrolyzing the detoxified cutting oil with EDTA and concentrated sulfuric acid at 120℃ for 15 minutes. Experiments showed that the strongest emission intensity of N, S co-doped CQDs was irradiated with ultraviolet light of 330 nm. The quantum yield of N, S co-doped CQDs was 2.3%. It showed the Fe3+-sensitive behavior and the PL intensity has a good linear relationship, and it had the fine stability at pH 2.0-11.0. It could be applied to environmental water quality testing and the had good recovery. (Fe3+ recovery in well water: 105.8 %, Fe3+ recovery tap water: 102.4 %)

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