TiO2Quantum Dots Modified g-C3N4and Its Photocatalytic Decoloration Performance
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摘要: 为进一步提高g-C3N4光催化活性,采用等孔体积浸渍法制备了TiO2量子点修饰的g-C3N4。研究结果表明TiO2量子点修饰使g-C3N4的XRD衍射峰、表面性质参数、粒径分布和对可见光的吸收有显著影响。以罗丹明B为模拟污染物,在模拟太阳光照射下对所制备TiO2/g-C3N4光催化性能进行了测试。结果表明,经TiO2量子点修饰后g-C3N4光催化性能显著增强,当TiO2/g-C3N4质量比为3%时,所制备样品具有最高的活性。捕获剂测试结果表明,·O2-离子是光催化降解反应中主要的活性物种。Abstract: To further promote the photocatalytic performance of g-C3N4,TiO2 quantum dots were loaded on g-C3N4 by a pore impregnating method.The results show that the TiO2 quantum dots modification significantly influences the XRD patterns,surface parameters,particle size distribution and the visible light adsorption of g-C3N4.Using Rhodamine B as a simulated pollutant,the photocatalytic activity of obtained TiO2/g-C3N4 was evaluated under a simulative sunlight irradiation.It is indicated that all the composites with TiO2 quantum dots modification exhibit higher photocatalytic performance than the pristine g-C3N4.When the mass ratio of TiO2/g-C3N4 is 3%,the composite displays the highest photocatalytic activity.The trapping experiments show that ·O2- is the main active free species for the photocatalytic decolorization reaction.
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Key words:
- TiO2 /
- g-C3N4 /
- quantum dots /
- photocatalysis /
- decolorization
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