| Summary: | 碩士 === 國立成功大學 === 環境工程學系碩博士班 === 94 === In this research, the low temperature plasma in conjunction with two types of monomers and various grafting operations was applied to activate the surface of polypropylene (PP) fiber for functional structures. For the PP fiber, the activation was optimized with the Ar, N2, and O2 plasmas at a condition of 1000 W of power, 200 mtorr of air pressure, and 30 sec of reaction time. In one of the grafting experiments (the first approach), the Thiourea monomer was directly grafted onto the surface of PP fiber after the plasma activation at various Thiourea concentrations and different grafting temperatures. In the other grafting experiment (the second approach), the activated PP fiber was grafted with acrylic acid (AAc), followed by the Thiourea monomer grafting procedure. Both products were used for copper ion removal experiments, and the surface analysis of these PP fabrics analyzed with X-ray photoelectron spectroscopy (XPS) demonstrated the presence and the function of grafted materials.
Results of copper removal experiments showed that the removal efficiencies range from 1.28 ~ 5.67% when the Thiourea concentrations were 0.1M, 0.5M and 1M at the reaction temperature of 3°C, 25°C, and 60°C in the first approach experiments. On the other hand, the copper removal efficiency increased to 64.53 % when the grafting procedure fellowed the AAc and Thiourea monomer grafting sequence in the second approach experiment. Results of XPS analyses showed the structure changes of the PP fiber and confirmed the monomer grafting. It was concluded that the PP fiber surface could be grafted with different monomers after plasma activation and the modified products could be potential adsorption materials for heavy metal removal in wastewater treatments.
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