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| TiO2纳米颗粒担持光波导的制备及其光催化性能 |
| Preparation and photocatalytic property of TiO2 nanoparticle-adhered optical waveguide |
| 投稿时间：2024-03-05 |
| DOI：10.3969/j.issn.1005-5630.202403050031 |
| 中文关键词: 光波导 担持 深层污水 光催化降解 |
| 英文关键词:optical waveguide adhering deep wastewater photocatalytic degradation |
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| 中文摘要: |
| 光催化技术作为治理废水的新型方法备受关注。然而，在实际应用中，对于水质受到严重污染的环境，光波难以深入，因此光催化反应主要局限于水体表面。此外，催化剂分散型光催化存在催化剂残留严重、难以分离的问题。本文提出采用石英光波导与聚二甲基硅氧烷(PDMS)光波导对TiO2纳米颗粒进行担持来应对上述问题。一方面，光波可以通过光波导传输至废水深层，激发表面担持的TiO2，从而降解深处的污染物。另一方面，纳米颗粒附着在波导表面，不容易导致二次污染。实验表明，分别由石英波导与PDMS波导担持的TiO2，经10 h的紫外线照射后，对1.04×10–6 g/mL罗丹明 B水溶液中罗丹明B的降解率分别可达78.9%和88.8%。此外， PDMS担持TiO2导波在碳素墨水模拟的污水环境降解罗丹明 B时，其10 h降解率为63.1%，是直接将TiO2分散于水体时降解率的2.21倍。TiO2纳米颗粒担持光波导制备方法简单，成本低廉，在工业废水及自然环境净化等领域具有广阔的应用前景。 |
| 英文摘要: |
| Photocatalysis has attracted great attention as a new method for wastewater treatment. However, in practical applications, particularly in environments with severe water pollution, the penetration of light into deeper layers is challenging, thereby restricting photocatalytic reactions mainly to the water surface. In addition, dispersed catalyst has the problem of residue and difficulty in separation. In this study, TiO2 nanoparticles (NPs) adhered quartz and polydimethylsiloxane (PDMS) optical waveguides are proposed to address the aforementioned issues. By employing this approach, light can effectively reach the deep layers of wastewater, activating the TiO2 NPs on the waveguide surface and facilitating the degradation of pollutants in these deep layers. On the other hand, TiO2 NPs adhered on the waveguide surface reduce the likelihood of secondary pollution. Experiments have demonstrated that TiO2 NPs adhered quartz optical waveguide and PDMS optical waveguide can degrade rhodamine B (Rh B) in its aqueous solution with a concentration of 1.04×10–6 g/mL at degradation rates of 78.9% and 88.8%, respectively, after 10 hours of 365 nm UV irradiation. In the testing of heavily polluted water with Rh B carbon ink mixture, the TiO2 NPs-adhered PDMS waveguide exhibits an averaged degradation rate of 63.1% after 10 hours of irradiation, which is approximately 2.21 times that achieved with a direct TiO2 NPs-dispersed photocatalytic system. The preparation method of TiO2 NPs-adhered waveguides is simple and cost-effective, and has wide application prospects in industrial wastewater and environment purification. |
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