کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675867 | 1454109 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A nanometer-ZnO catalyst to enhance the ozonation of 2,4,6-trichlorophenol in water
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A nanometer-ZnO catalyst to enhance the ozonation of 2,4,6-trichlorophenol in water A nanometer-ZnO catalyst to enhance the ozonation of 2,4,6-trichlorophenol in water](/preview/png/9675867.png)
چکیده انگلیسی
Removal of 2,4,6-trichlorophenol (TCP) from water has been accomplished through zinc oxide (ZnO) catalytic ozonation. In the presence of ZnO catalyst, aqueous ozone (O3) can be described by a two-stage behavior, first involving a short-term rapid decomposition followed by a second slow decomposition. The low reaction rate (kd2) of second stage for O3-ZnO systems suggested that most of O3 was transferred into OH radical by ZnO catalyst and was rapidly consumed during the first stage. The combined use of O3 and ZnO catalyst leads to a conspicuous 99.8% of TCP conversion in 30 min which compares favorably to the hardly 75% reached in the absence of the catalyst. The high reactivity of hydroxyl radicals that were generated by O3-ZnO during the oxidation process effectively degraded TCP. Without regard to the O3 dose, the catalytic-oxidation kinetics of the process depends on the concentration of ZnO catalyst and size of ZnO particles. At the same concentration of three different ZnO size in batch tests, TCP degradation rates were in the order of nanometer > submicrometer > micrometer. The effect of pore diffusion on the rate of TCP-ZnO reactions was determined by examination of the effectiveness factor using different particle sizes of ZnO. Calculations show that the rate of TCP decomposition by nano-size ZnO was strongly controlled by surface reaction with little influence of pore diffusion, as indicated by the high effectiveness factors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 260, Issues 1â3, 15 June 2005, Pages 45-51
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 260, Issues 1â3, 15 June 2005, Pages 45-51
نویسندگان
Winn-Jung Huang, Guor-Cheng Fang, Chun-Chen Wang,