کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
583986 | 877882 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photocatalytic degradation of phenol in aqueous solutions by Pr-doped TiO2 nanoparticles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
Photocatalytic degradation of phenol in water was examined using Pr-doped TiO2 nanoparticles. These photocatalysts were synthesized by an acid-peptized sol-gel method from titanium tetra-isopropoxide with different concentrations of Pr(III) dopant and calcination temperatures. Several tools such as XRD, BET surface area, SEM, and EDX, were used to evaluate particle structure, size distribution, and composition. The optical absorption properties of the prepared particles were also measured. Photocatalytic activity of the particles was studied in a batch reactor containing phenol solution with 400Â W UV irradiation. Parameters affecting photocatalytic process such as the catalyst crystallinity, light absorption efficiency, the dosage of catalyst, dopant and phenol concentrations were investigated. The Pr-doped TiO2 showed high activity for photocatalytic degradation of phenol. The presence of Pr ions in the TiO2 particles would cause a significant absorption shift towards the visible region. The degradation process was optimized using 1Â g/L Pr-doped TiO2 with a Pr(III) concentration of 0.072Â mol% after 2Â h irradiation. It was shown that photodegradation followed a pseudo-first-order kinetics and the rate constant changed with phenol concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 149, Issue 1, 1 October 2007, Pages 1-7
Journal: Journal of Hazardous Materials - Volume 149, Issue 1, 1 October 2007, Pages 1-7
نویسندگان
Chwei-Huann Chiou, Ruey-Shin Juang,