- 學位論文
無電鍍鎳稀釋鍍液中鎳離子之離子交換回收
Ion Exchange Recovery of Nickel(II) from Dilute Electroless Nickel Plating Solutions
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摘要
本論文使用NRW-100陽離子交換樹脂，分別改變不同的溫度、pH值及鎳金屬濃度，來找出陽離子交換樹脂處理無電鍍鎳模擬廢液中的重金屬Ni2+效能影響。實驗分成批次平衡交換及固定床交換。在批次平衡交換方面，平衡交換量隨pHe、濃度、溫度增加而增加，交換過程屬於吸熱反應，這可由平衡常數計算出的反應熱正負值得到證明。經由計算與實驗結果比較得知，此離子交換實驗符合Langmuir等溫式。 在固定床交換方面，改變無電鍍鎳模擬廢液的流速、濃度、pH值及床高等變因進行實驗。貫穿所需時間隨著流速、濃度、pH值的增加成反比，而與床高成正比。此外，在高pH值的無電鍍鎳模擬廢液中，Citrate與Ni2+錯合成少部分的陰離子，而陽離子交換樹脂不會與陰離子交換，導致陰離子直接通過，使得初始C/C0值不為0。增加交換管柱高度可延長兩相接觸時間，有利於交換，且較快達到飽和。以Axial dispersion及Constant pattern wave等二模式進行探討。結果發現，Axial dispersion模式並不適合用本系統，顯示軸向擴散效應可忽略。其飽和時間隨著流速、濃度、床高的增加而減少，而隨著pH值增加而增加。利用Constant pattern wave模式所求得之總液相質傳係數，分別與流速、濃度成正比，與pH值成反比，而與床高無關。 最佳的金屬回收操作條件， pH值在1-3之間，流速為5 mL/min，床高為10 cm。
並列摘要
In this work, the recovery of nickel from dilute electroless nickel plating by cation exchange resin NRW-100 was studied. Batch equilibrium experiment and fixed bed experiment were carried out. For the experiment of batch, exchange equilibrium, the Langmuir model were tested to fit the sorption isotherms. Thermodynamic parameters were obtained from the experiments of varying temperature (15-45 oC). It was found that an increase in temperature would lead to an increase in sorption capacity. It was indicated the exchange process was endothermic and spontaneous. Fixed-bed experiments were carried out as velocity, feed concentration, and bed height. The axial dispersion equation and constant pattern wave equation were used. The constant-pattern wave approach has been used to develop explicit equations for the breakthrough curves of the fixed-bed processes with the Langmuir isotherms, respectively. The results showed that exhaustion time increased with decreasing velocity and concentration, but increasing bed height. The optimal comditions for nickel recovery were found to be pH 1-3, a velocity of 5 mL/min and a bed height of 10 cm.
參考文獻
糜福龍，「幾丁聚醣-三聚磷酸螯合劑型樹脂對二價銅離子之吸附研究」，Chemistry (The Chinese Chem. Soc., Taipei), 57(1), 11-24 (1999)。
Akita, S.; Takeuch, H. “Sorption and separation of metals from aqueous solution by a macromolecular resin containing tri-n-octylamine,” J. Chem. Eng. Jpn., 23(4), 439-443 (1990).
Akita, S.; Takeuch, H. “Sorption and separation of divalent metals by a micromolecular resin containing organophosphorus acid,” J. Chem. Eng. Data., 37(3), 303-306 (1992).
Akita, S.; Takeuch, H. “Equilibrium distribution of palladium(II) between hydrochloric acid solution and a macromolecular resin containing tri-n-octylamine,” Solvent Extr. Ion Exch., 11(5), 797-810 (1993).
Allen, H. E.; Chen, P. H. “Remediation of metal contaminated soil by EDTA incorporating electrochemical recovery of metal and EDTA,” Environ. Prog., 12(4), 284-293 (1993).