Investigation of the Degradation of Dyes Using Synthesized Nano-Nickel Oxide Photocatalysts and Iron Powders
| Autor: | Hung-Tse, 林宏澤 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 Dye chemicals have always received great attention as contaminants in the water treatment process. In recent years, it has been numerous literatures on the treatment of organic halide through zero-valent iron; however, those on the degradation of trimethyl methane dye through zero-valent iron have been very limited. In addition, it has yet to be any studies on the effective use of metal chelating agent for the catalyzed degradation of reduced iron on triphenyl methane. In the field of photocatalysts, various metal oxides have been discovered to be of great catalysts, nickel hydroxide being one of them. Of which, β-Ni(OH)2 appears to be the most applicable, and is often used for the positive end of batteries. Therefore, the positive end of batteries can be recycled for photocatalysts, making it easy to obtain. The ideas of using recycled waste to treat other wastes, in another word, using β-Ni(OH)2 to treat dye contaminants has yet to be experimented; thus, the second part of this paper will study the degradation of β-Ni(OH)2 on dye chemicals. This thesis is divided into two parts, the first use ethyl violate as the subject for degradation, studying the catalyzing effects of iron powder found on the market in a degradation experiment on EV dye chemicals, under the influences of ethylenediaminetetraacetic acid (EDTA). The concentration of dye chemicals, pH level, molar ratio of additives, and the EDTA level, will all contribute to finding the most efficient degradation. The study conducts property analysis on reduced iron with X-ray photoelectron spectrometer (XRD) and X-ray photoelectron spectrometer (XPS), observes the surface changes with the use of Field-emission scanning electron microscopy-Energy dispersive spectrometer (FESEM-EDS). Through High pressure liquid Chromatography- UV-Visible light detectors- Electron Spray Ionization/ Mass Spectrometer (HPLC-UV-ESI/MS), we can identify the intermediate products obtained from the degradation of EV dye, which provides a foundation of solution for the treatment of reduced iron/ EDTA dye contaminants. The identifying of intermediate product and possible solutions to degradation starts by using HPLC-PDA-ESI-MS for the separate identification of EV dye. After successfully obtaining the intermediate product produced from the removal of EV in EDTA-Fe, we also obtain the possible reaction mechanisms, N-de-methylated, hydroxylation reactions, and cleavage of conjugated chromophore structure. The second part of this study is the use of hot water to produce synthetic β-Ni(OH)2 photocatalyst using the NiSO4(NH4)2．9H2O. First, mix the starting material with distilled water or solvent, adjust for the appropriate pH level and nucleating agent. Then, place the starting material into a flask and lowly heat up with a reflux device. The sample will be reacted with XRD, FESEM-EDS, XPS to test for its properties. Next, expose the sample to ultraviolet light and visible light, and observe the catalyzing effect of β-Ni(OH)2 on the degradation of dye chemicals. The results indicated the physical-chemical properties of β-Ni(OH)2. Finally and mostly importantly, separate and identify the intermediate product of degradation with HPLC-PDA-ESI-MS, in order to predict and discuss the method of degradation. |
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