本研究係以丙烯酸為單體，以硝酸鈰銨（CAN）為起始劑對聚丙烯纖維行接枝聚合反應，製備羧基型離子交換材（carboxyl ion-exchanger），改變接枝參數，探討不同接枝條件對離子交換材物化特性之影響。並以最適接枝參數進行不同操作條件（鹼化、反應時間、pH值、基材添加量）下，探討羧基型離子交換材對銅離子吸附效能及行為，並利用適當的脫附劑將富集於離子交換材表面上的銅離子脫附回收。
實驗結果顯示於添加4M丙烯酸單體、使用HNO3提高CAN催化能力、接枝時間6hr、接枝溫度60℃之最適接枝條件，羧基型離子交換材可得最大接枝率。而由後續銅離子吸附去除實驗結果顯示，pH＝4、反應吸附時間60分鐘以上，羧基型離子交換材可有效將50mg/L銅溶液處理達放流水法規標準3mg/L，其吸附量達11.79 mg-Cu/g-polymer， 吸附行為屬Langmuir等溫吸附模式，速率符合一階反應吸附動力。另外，由脫附試驗結果可知，HNO3為最適酸脫附劑，於濃度6N、脫附時間15分鐘以上，可得 80％以上脫附率。羧基型離子交換材雖經五批次銅吸脫附實驗，其最終吸附效能仍可為第一次吸附效能83％以上，顯示其再生特性良好。由上述結果可知，羧基型離子交換材對銅離子具良好的吸附效能及再生性，配合酸脫附回收重金屬，應可達資源循環利用目標。

In this research, the synthesis of carboxyl ion-exchanger was carried out by applying acrylic acid grafting onto polypropylene fibers. The ceric ammonium nitrate (CAN) was used as initiator for the carboxyl ion-exchanger preparation. The influence of the alkalization process and the effectiveness of carboxyl ion-exchanger for removal and recovery of copper using various operating conditions such as reaction time, pH and Cu/carboxyl ion-exchanger molar ratio were also evaluated in this work.
Results from the synthesis experiments of carboxyl ion-exchanger showed that the maximum graft ratio was obtained with the concentration of acrylic acid as 4M, grafting time of 6 hrs and grafting temperature of 60℃. Under upon provision, the synthesized carboxyl ion-exchanger was used for copper removal treatments. And the results showed that with the reaction pH = 4, reaction time = 60 minutes, the synthesized carboxyl ion-exchanger could treat the copper-containing wastewater (50 mg/L) to the level that meets the Taiwan EPA’s effluent regulations (3 mg/L). The kinetics and the equilibrium studies indicated that the rate of copper uptake by carboxyl ion-exchanger was quite rapid and followed a pseudo-first-order kinetic model. The adsorption capacities for copper calculated from Langmuir isotherm equation was 11.79 mg-Cu/g-polymer.
Results from the desorption experiment showed that 6N HNO3 was an efficient desorbing solution, which presenting the release amount of 80％ of copper from ion-exchanger during reaction time of 15 minutes. Moreover, after five cycles of copper adsorption/desorption experiments, the adsorption capacity of carboxyl ion-exchanger was diminished 17% only, comparing the fresh one. From the above results, the carboxyl ion-exchanger presents the feasibility for removal and recovery of copper from wastewater, which could be a worthwhile alternative.

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