Metal Removal from Al Etchant Waste Solution
Date Issued
2005
Date
2005
Author(s)
Wu, Chun-Cheng
DOI
zh-TW
Abstract
In this thesis, removal of aluminum ions from aluminum etchant waste solution was performed by electrosorption and ion exchange resins. For electrosorption method by activated carbon, both pellet-type activated carbon and activated carbon fiber (ACF) were used in experiments. Modification approaches on both electrode and electrolyte were tested to support electrosorption behaviors. By taking control of proper applied voltage, adsorption efficiency was found to be raised and desorption operation was also feasible. The results showed that aluminum complex ion was specifically adsorbed on positive-charged ACF electrode and the maximum adsorption capacity was reached at +0.5V applied potential. For ion-exchange method, strong acid cation resin with chelating functional group was used for removal of multivalent metal ion. Both batch and packed-bed column experiments were performed. Then some effects were discussed, such as degradation lead by presence of nitrate ion, temperature effect and concentration effects. Shrinking-core model was used to explain the mass transfer phenomena in batch operation and breakthough curves were also built by experimental data in packed-bed column and modeled by BDST model. The results showed that aluminum complex ion was removed most efficiently in diluted waste at room temperature, and presence of more than 3wt% nitrate ions was harmful to the resin. The estimated selectivity coefficient of Al3+/H+ in the resin was 2.93×10-4 on average.
Subjects
金屬移除
鋁蝕刻廢液
電吸附
離子交換
Metal removal
Al etchant waste solution
Electrosorption
Ion exchange
SDGs
Type
thesis
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