| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 97 === The surface modification of PET fiber in this study was done by Benqzoyl peroxide activation and acrylic acid grafting. Acrylic acid monomer was grafted for the preparation of carboxyl type ion-exchange material. To exam the influence of different operating parameters on the PET adsorption material grafting effect; first of all, choose the optimal grafting parameter to prepare PET adsorption material, and carry out the adsorption experiments under different conditions to exam carboxyl-type adsorption of copper ion adsorption material performance and behavior. Lastly, select the appropriate desorption agent to discuss the effectiveness of copper ion desorption, recycling adsorption and durability of adsorption material. Moreover, simulations of wastewater and plant wastewater were used to evaluate the feasibility of the prepared adsorption materials.
The results show that optimal grafting conditions are with additions of 1M acrylic monomers, 0.1 M sulfuric acid to enhance the catalyzing capacity of 0.002 M BPO, grafting time of 4 hours and grafting temperature of 80oC. The best graft percentage of prepared carboxyl-type adsorption material is 12%. The results from copper ions removal experiment shows that when pH = 4 and adsorption time of 60 minutes, carboxyl adsorptive material can effectively treat copper solution from originally 50mg/L to under the regulatory standards of 3 mg/L, the adsorption amount is about 20 mg-Cu /g-polymer. In addition, obtaining from the desorption experiment, the optimal agent is HNO3, and at the concentration of 0.01N and desorption time of 1 hour, the copper desorption rate can reach more than 95%. Moreover, when continued with second adsorption, the adsorption capacity increased to 27.4 mg-Cu/g-polymer. After five batches of adsorption and desorption experiments, the adsorption effect still remains over 95%, which shows a good quality of regeneration property.
Furthermore, the adsorption selectivity of PET material to heavy metals in wastewater is Pb2+> Cu2+> Ni2+. When applied to copper electroplating wastewater, copper can be effectively adsorbed and recovered. The adsorption capacity is up to 0.37 mmol-Cu/g-polymer, Hence PET carboxyl-type adsorption material has a great potential for heavy metal recovery application.
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