| Summary: | 碩士 === 國立臺北科技大學 === 材料及資源工程系碩士班 === 92 === Wastes containing heavy metals present serious problems to the environment, if they are not properly treated. The total solution to this problem should focus on the complete separation of heavy metals from the waste. However, economic barrier is frequently the major concern for heavy metals removal from the waste. Specific cation exchanger is a kind of functional polymer, which possesses capability to select and adsorb metal ions via coordination bonding. In this study, one kind of industrial waste, wastewater from printed circuit board process, was subjected to separation process in order to recover the valuables. By (1) solvent-nonsolvent method, (2) seeded polymerization and (3) stable free radical polymerization, intelligent polymer materials were prepared as ion-exchange resin with high metal selectivity. Three new types of ion exchange resins were developed and characterized. Separation experiments were conducted to demonstrate the feasibility of possible applications of these ion exchange resins.
In this study, Amberlite XAD-4 resin was used as base material, of which the surface is modified to have following characteristics. (1) Different chain length organic acid can be immobilized on the surface of Amberlite XAD-4 resin by solvent-nonsolvent process. (2) Different crosslinking degree of pH-sensitive polymer was synthesized by multi-step seeded polymerization. (3) TEMPO as stable free radical agent, poly(styrene-co-acrylic acid) was synthesized via living free radical polymerization. The experiment results showed that heavy metals can be separated and recycled from the leaching solution using of these new type resins.
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