TiO₂ 纳米颗粒担持光波导的制备及其光催化性能

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中图分类号：O439文献标志码：A

Abstract： Photocatalysis has atracted 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 challnging，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 1.04×10-6g/mL at degradation rates of 78.9% and 88.8% ，respectively，after 10 hours of 365nm （24 UV irradiation. In the testing of heavily poluted 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.

Keywords： optical waveguide; adhering; deep wastewater; photocatalytic degradation

引言

光催化技术作为解决环境污染的新型方法的代表[1]，目前已经在环境净化等多个前沿领域得到广泛应用[2]。（剩余11510字）