本研究自行合成不溶性澱粉黃酸鹽(Insoluble Starch Xanthate, ISX)，並使用黃酸鹽程序處理溶液中之銅離子，探討最適硫/銅比條件，並依最適添加配比進行不同操作條件(反應時間、pH值、ORP、添加氯鹽及硫酸鹽)下，ISX對銅離子去除效率之影響。此外，探討混合重金屬溶液之去除效率，並以ISX處理實廠廢水印證重金屬去除效率及操作條件。最後，以熱處理回收黃酸鹽程序所捕集之重金屬，並將不同溫度下之生成物以元素分析、X光繞射儀(XRD)及FTIR分析，期能了解熱反應行為並找尋最適回收溫度。

　　金屬離子去除實驗結果顯示，在硫/銅比1.8～2.5、pH＝3～6、ORP值200～500mV條件下，ISX可有效將中高濃度500mg/L銅溶液去除達放流水法規標準。而低pH值及還原環境會降低ISX去除銅離子效率，硫酸鹽及氯鹽濃度於5%以下時並不影響。於金屬混合溶液中，ISX具選擇性去除重金屬，可用以分離回收重金屬。熱處理實驗結果顯示，Cu-ISX和Zn-ISX錯合物經熱處理後會形成CuO及ZnO等金屬氧化物具回收價值，且Zn只須640℃，Cu須780℃。Pb-ISX錯合物則無法形成單純PbO，即使高達1050℃仍以PbSO4．4PbO和α- Pb3O2SO4，須借重其他回收處理程序純化。由上述結果可知，ISX具有選擇性捕集廢水中重金屬之特性，配合熱處理回收處理，可達資源循環利用目標，而有別於傳統化學混凝沉澱續以固化/穩定化處理過程。

　In this study, the optimum operating condition for the removal of Cu(Ⅱ) by insoluble starch xanthate (ISX) and further recovery of metals by thermal treatment were investigated. The operating condition such as sulfur/copper molar ratio, reaction time, pH, ORP, chloride and sulfate concentration for copper removal were also investigated by batch experiments. Recovery of heavy metals from metal-ISX complexes by thermal treatment was performed under different temperatures. The effect of thermal treatments were evaluated by elemental analysis (EA), X-ray powder diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analysis.

　Results from batch metal removal experiments showed that the removal of copper ion was optimized with sulfur/copper molar ratio between 1.8 and 2.5, pH between 3 and 6, and ORP between 200mV and 500mV. No significant effect on copper removal efficiency was observed with chloride and sulfate concentrations below 5%. Copper ion could even be selectively removal from aqueous multi-heavy metal solutions and electroplating wastewater by ISX under the optimum operating conditions.

　The behaviors of metal-ISX complexes under thermal treatments were not quite the same between different complexes. Cu-ISX and Zn-ISX complexes would be oxidized and transformed to CuO and ZnO under 780℃and 640℃. Nevertheless, the sulfur content in Pb-ISX complexes would not be fully removed even with 1050℃ thermal treatment. The major crystalline phase identified are PbSO4．4PbO and α- Pb3O2SO4 instead of PbO.

　From the above results, it was concluded that ISX is capable of selective removal of copper from wastewater. Furthermore, metals could be recovered from metal-ISX complexes by thermal treatments. ISX process combined with thermal treatment could be a comprehensive solution for both heavy metals-containing wastewater treatment and subsequent sludge disposal requirements.

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