本研究在批式系統中同時金屬置換水溶液中的銅、鎘和鉛離子，探討各項實驗操作變因如犧牲金屬的種類(鋁、鋅、鐵)、犧牲金屬板的表面積(125-750 cm2)、溶液pH值((pH 1.0-5.0)以及溶液溫度(25.0-55.0 °C)。並透過XRD與SEM對金屬置換之沉積物進行定性分析。在特定的操作條件下發現只有以鋅板作為犧牲金屬才能同時金屬置換銅、鎘和鉛離子。金屬置換的反應速率為擬一階模型，且受鋅板表面積以及銅、鎘和鉛離子的濃度影響。以鋅板金屬置換銅、鎘和鉛離子其移除率不受溶液pH值影響，但鋅的消耗量會隨著溶液pH值降低而上升。同時金屬置換銅、鎘和鉛離子的活化能分別為17.9 kJ/mole, 20.8 kJ/mole 及 21.5 kJ/mole，顯示此反應為擴散控制。在pH 4.0、25.0 °C、反應時間25分鐘下，以750 cm2的鋅板金屬置換合成溶液中的銅、鎘和鉛離子，其濃度分別可降低到0.04 mg/L, <0.01 mg/L 及 0.01 mg/L。本研究成功地將金屬置換程序應用於焚化爐飛灰的酸洗濾液中銅、鎘和鉛離子的移除。其濃度分別可減少至0.02 mg/L, <0.01 mg/L 及0.12 mg/L，符合放流水標準。從沉積物的XRD分析中觀察到銅鎘合金、金屬態銅、金屬態鉛與氧化鉛在鋅片上。金屬置換後溶液中的鋅離子以中和沉澱在pH 8.0下移除。

The simultaneous cementation of Cu2+, Cd2+ and Pb2+ in solution was carried out in a batch system. The effects of sacrificial metal type (Al, Zn and Fe), surface area of sacrificial metal plate (125-750 cm2), solution pH (pH 1.0-5.0) and solution temperature (25.0-55.0 °C) were investigated. The characterization of deposit was analyzed by XRD and SEM. Under the specific conditions, the simultaneous removal of Cu2+, Cd2+ and Pb2+can only be achieved when the Zn plate was used as the sacrificial metal. The cementation rate is pseudo-first-order with respect to both the surface area of Zn plate and the concentrations of Cu2+, Cd2+ and Pb2+. The removal of Cu2+, Cd2+ and Pb2+ by cementation with Zn plate was independent on solution pH while zinc over-consumption significantly increased with the decrease in solution pH. The activation energy for the simultaneous cementation of Cu2+, Cd2+ and Pb2+ were 17.9 kJ/mole, 20.8 kJ/mole and 21.5 kJ/mole, respectively, indicating that the reaction was diffusion-controlled. The concentrations of Cu2+, Cd2+ and Pb2+ in synthetic solution can be reduced to 0.04 mg/L, <0.01 mg/L and 0.01 mg/L, respectively, by cementation with 750 cm2 Zn plate under pH 4.0 and 25 °C for 25 min. The cementation with Zn plate was successfully applied for the removal of Cu2+, Cd2+ and Pb2+ in the leachate of incineration fly ash and the concentrations of Cu2+, Cd2+ and Pb2+ decreased to 0.02 mg/L, <0.01 mg/L and 0.12 mg/L, respectively, which met the effluent standards. According to XRD analysis of deposit, Cu-Cd alloy, metallic copper, metallic lead and lead oxide were observed on Zn plate. The cementation in IFA leachate was followed by neutralization carried out under solution pH 8.0 to remove Zn2+.

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