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Title: Degradation of acetaminophen by UVA/LED/TiO 2 process
Authors: Xiong, P.
Hu, J. 
Keywords: Degradation
L-H law
Optimal operation conditions
Issue Date: 3-May-2012
Citation: Xiong, P., Hu, J. (2012-05-03). Degradation of acetaminophen by UVA/LED/TiO 2 process. Separation and Purification Technology 91 : 89-95. ScholarBank@NUS Repository.
Abstract: Photocatalytic process that uses traditional low pressure mercury lamp and TiO 2 as catalyst has attracted numerous attentions recently for the degradation of organic pollutants in water environment. However, there are several important drawbacks to this mercury lamp such as high energy cost and the production of toxic mercury waste. Compared to traditional mercury lamp, the newly emerging UVA/LED is more efficient in converting electricity into light. It has longer lifetime and no toxic waste generation problem exists. Therefore, the purpose of this research was to study the ability of high power ultraviolet A light-emitting diode (UVA/LED) as a light source in the degradation of organic pollutants. The optimal operational conditions were also determined. In this study, a new device equipped with high-energy 365 nm UVA/LED using TiO 2-P25 as the catalyst was developed and evaluated for photolytic/photocatalytic oxidation of acetaminophen (Ace). The results showed that the chosen UVA/LED alone degraded negligible amount of Ace, while in the presence of TiO 2, the concentration of Ace decreased substantially. In most experiments of this study, Ace could be degraded to non-detectable level within 20 min. The degradation rate was found to be related to the dosage of TiO 2, initial Ace concentration and light intensity. Based on the experimental data, the following kinetic equation was achieved by kinetic modeling: rs=-2.4168× I0.5732×[Ace]1+0. 1523×[Ace] 0, which was also in agreement with the Langmuir-Hinshelwood (L-H) law. © 2011 Elsevier B.V. All rights reserved.
Source Title: Separation and Purification Technology
ISSN: 13835866
DOI: 10.1016/j.seppur.2011.11.012
Appears in Collections:Staff Publications

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