碩士 / 國立清華大學 / 生醫工程與環境科學系 / 104 / Photoelectrocatalysis which combines photocatalytic and electrocatalytic processes, is not only a novel and feasible method for degradation of Microcystin-LR, but also a powerful method to enhance the photocatalytic activity of photocatalyst.
In this study, we have been successfully fabricated zero-valent copper/titanate nanotubes/graphene composite (Cu0/TNT/rGO) and apply to photoelectrocatalytic degradation of Microcystin-LR. At first, we can obtain the titanate nanotubes which is covered by titanium dioxide nanocrystals from microwave-assisted hydrothermal method and thermal treatment. Then we can get the zero-valent copper/titanate nanotubes/graphene composite from sodium borohydride reduction and hydrogen gas calcination of copper ions and graphene oxide. The XRD, TEM, and EIS showed that graphene can avoid the composite from aggregation due to high temperature calcination, and suppress the impedance of the composite. For photoelectrocatalytic application, we focus on discussing the effects caused by the different the amount and species of copper. The results showed that the degradation ratio of Microcystin-LR is 85 % in 180 mins and the rate constant is 1.2*10-2 min-1 when the copper loading of Cu0/TNT/rGO is 8 wt% which is the best performance. The EPR and EIS results displayed that the presence of zero-valent copper in Cu0/TNT/rGO can produce •OH, •OOH and •OOR under UV light illumination, but pure calcined titanate nanotubes can only produce •OH. This study demonstrates that the importance of zero-valent copper in Cu0/TNT/rGO can not only enhance the ability to generate free radicals, but also suppress the electron-hole recombination by decreasing the impedance.
| Identifer | oai:union.ndltd.org:TW/104NTHU5810033 |
| Date | January 2016 |
| Creators | Yang, Yen-Tung, 楊晏東 |
| Contributors | Doong, Ruey-An, 董瑞安 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 107 |
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