| Summary: | 碩士 === 國立中正大學 === 化學工程研究所 === 105 === The rapid development of science and technology makes our life more convenient, but also brings harmful effect on the environment. One of the major environmental problems is how to detect and degrade the endocrine disruptors. Photosensitizer is the popular material nowadays with photodynamic property, which produce singlet oxygen (1O2) with high activity. Thus, we fabricated a photosensitizer-based nanofibers by combination of electrospinning technology and photoactive property of photosensitizers. The high surface-to-volume-ratio of nanofibers increases the efficiency of the singlet oxygen generation to degrade the endocrine disruptors. In this work, we synthesized two different molar (or weight??) ratios of ploly(styrene-co-sodium styrene sulfonate) via free radical polymerization. Polystyrene was hydrophobic and could maintain good nanofibrous structure in aqueous solution. Poly(sodium styrene sulfonate) (PSSS) could provide negative charge to adsorb the positive charged photosensitizer (TMPyP) by electrostatic force. With adding different proportions of PEG to increase the viscosity of polymer solution, the uniform nanofibrous membrane with diameter about 435 nm ± 32 nm and 336 nm ± 46 nm could be obtained. Fourier-Transform Infrared Spectrometer (FTIR), X-ray photoelectron spectroscopy (XPS) and Fluorescence spectrometer were used to characterize the properties of TMPyP-based nanofibers. ABDA (9,10-anthracenediyl-bi(methylene)dimalonic acid) was utilized to ensure the generation of singlet oxygen upon irradiation with xenon lamp. Finally, the TMPyP -based membrane was irradiated to produce singlet oxygen for degradation of bisphenol A (BPA). High Performance Liquid Chromatography (HPLC), UV/VIS spectrophotometer were used to evaluate its photo-oxidative efficiency. The results showed that 25% of BPA was successfully photodegraded in neutral aqueous solution within 2 hours. Besides, the higher degradation efficiency was observed in basic solution (pH 10) that those in neutral or acidic solution (pH 4). We have also proved the reusability of the photosensitizer-based membrane.
|
|---|
