Shie Je-Lueng, Lee Chia-Hsiang, Chiou Chyow-San, Chang Chang-Tong, Chang Chia-Chi, Chang Ching-Yuan
Department of Environmental Engineering, National I-Lan University, 1, Section 1, Shen-Lung Road, I-Lan 260, Taiwan.
J Hazard Mater. 2008 Jun 30;155(1-2):164-72. doi: 10.1016/j.jhazmat.2007.11.043. Epub 2007 Nov 21.
This study investigated the surface modification of photocatalyst and photodecomposition of formaldehyde from indoor pollution source. This study explored the feasibility of the application of the ultraviolet light emitting diode (UVLED) instead of the traditional ultraviolet (UV) lamp to treat the formaldehyde. The photocatalytic decomposition of formaldehyde at various initial concentrations was elucidated according to the Langmuir-Hinshelwood model. The reaction rate constant (k) and adsorption equilibrium constant (K(L)) over 0.334 g silver titanium oxide photocatalyst (Ag/TiO2) coated on glass sticks with 254 nm ultraviolet lamp (UVC), 365 nm ultraviolet lamp (UVA), and UVLED are 650 ppmv min(-1) and 2 x 10(-4)ppmv(-1), 500 ppmv min(-1) and 1.04 x 10(-4)ppmv(-1), and 600 ppmv min(-1) and 2.52 x 10(-5)ppmv(-1), respectively. A comparison of the simulation results with the experimental data was also made, indicating good agreement. The magnitudes of energy effectiveness (E(e)) are in the order of UVLED (0.6942 mg kW(-1)h(-1))>UVA (0.007 mg kW(-1)h(-1))>UVC (0.0053 mg kW(-1)h(-1)). The E(e) of UVLED is 131 times larger than that of UVC. The UVLED can save a lot of energy in comparison with the traditional UV lamps. Thus, this study showed the feasible and potential use of UVLED in photocatalysis.
本研究调查了光催化剂的表面改性以及室内污染源甲醛的光催化分解。本研究探索了应用紫外发光二极管（UVLED）替代传统紫外（UV）灯处理甲醛的可行性。根据朗缪尔 - 欣谢尔伍德模型阐明了不同初始浓度下甲醛的光催化分解情况。在涂覆有0.334 g银钛氧化物光催化剂（Ag/TiO₂）的玻璃棒上，使用254 nm紫外灯（UVC）、365 nm紫外灯（UVA）和UVLED时，反应速率常数（k）和吸附平衡常数（K(L)）分别为650 ppmv min⁻¹和2×10⁻⁴ ppmv⁻¹、500 ppmv min⁻¹和1.04×10⁻⁴ ppmv⁻¹、600 ppmv min⁻¹和2.52×10⁻⁵ ppmv⁻¹。还对模拟结果与实验数据进行了比较，结果显示吻合良好。能量效率（E(e)）的大小顺序为UVLED（0.6942 mg kW⁻¹h⁻¹）>UVA（0.007 mg kW⁻¹h⁻¹）>UVC（0.0053 mg kW⁻¹h⁻¹）。UVLED的E(e)比UVC大131倍。与传统紫外灯相比，UVLED可节省大量能源。因此，本研究表明UVLED在光催化中具有可行且潜在的应用价值。
