Kuo Chao-Yin
Department of Safety Health and Environmental Engineering, National Yunlin University of Science and Technology, Douliu, Yunlin, Taiwan.
J Hazard Mater. 2009 Apr 15;163(1):239-44. doi: 10.1016/j.jhazmat.2008.06.083. Epub 2008 Jul 1.
Photocatalysis research heavily emphasizes increasing photo-efficiency. This study presents the application of carbon nanotubes (CNTs) to increase the photocatalytic activity of TiO(2). It elucidates the effect of CNTs dose on the decolorization efficiency of aqueous azo dye, C.I. Reactive Red 2 (RR2), determines the effects of SO(4)(2-) formation and removal of total organic carbon (TOC), and measures the effects of various ultraviolet wavelengths. Scanning electron microscopy was used to elucidate the mixing phenomenon and the size of TiO(2) and CNTs; X-ray diffraction was used to determine crystallinity; a BET meter was used to measure surface area and a spectrophotometry was used to determine the decolorization of RR2. Experimental results indicated significant effects of photodegradation on the combination of TiO(2) with CNTs and electron transfer is higher for 410 nm irradiation than for 365 nm, revealing that solar light can be used. The electron transfer in the TiO(2)/CNTs composites reduced the electron/hole recombination and increased the photon efficiency and the prevenient dye-degradation mechanisms using UV/TiO(2)/CNTs were established.
光催化研究非常重视提高光效率。本研究介绍了碳纳米管（CNTs）在提高TiO₂光催化活性方面的应用。阐述了碳纳米管剂量对偶氮染料水溶液C.I.活性红2（RR2）脱色效率的影响，确定了SO₄²⁻的形成和总有机碳（TOC）去除的影响，并测量了各种紫外波长的影响。使用扫描电子显微镜来阐明TiO₂和碳纳米管的混合现象及尺寸；使用X射线衍射来确定结晶度；使用BET仪来测量表面积，并使用分光光度法来确定RR2的脱色情况。实验结果表明，光降解对TiO₂与碳纳米管的组合有显著影响，410 nm照射下的电子转移高于365 nm，这表明可以使用太阳光。TiO₂/碳纳米管复合材料中的电子转移减少了电子/空穴复合，提高了光子效率，并建立了使用UV/TiO₂/碳纳米管的先前染料降解机制。
