کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6582904 | 456355 | 2016 | 43 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photocatalytic degradation of recalcitrant POME waste by using silver doped titania: Photokinetics and scavenging studies
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The current paper reports on the photo-degradation of palm oil mill effluent over silver-modified titania (Ag/TiO2) under visible light irradiation. TiO2-based photocatalysts with 0.25-5.0Â wt% of Ag metal loadings were prepared by impregnating TiO2 with chemically-reduced Ag nanoparticles from the AgNO3 solution. The XRD characterization suggests that anatase was the predominant phase for all the as-synthesized photocatalysts. In addition, UV-Vis DRS confirmed that the Ag inclusion has extended the absorbance of photocatalysts to the visible light region. Moreover, the band gap energy of TiO2 was successively reduced to 2.69Â eV (5.0Â wt% Ag/TiO2), a drop from 3.1Â eV (bare TiO2). Consequently, the POME degradation efficiency jumped 300-15.03% by photoreaction over 1.0Â g/L of 0.25Â wt% Ag/TiO2 compared to the bare TiO2. The optimum loading of Ag was found to be 0.5Â wt%, with corresponding degradation of 19.73%, and can be enhanced further to 26.77% with the optimum catalyst loading of 1.5Â g/L. Moreover, scavenging study confirmed that the primary reactive species for POME degradation in the current system was OH free radicals. In recycling test, the degradation efficiency of 0.5Â wt% Ag/TiO2 dropped to 11% and 13% for second and third cycle, respectively, due to leaching of Ag metal as proven by ICP-MS, post-reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 286, 15 February 2016, Pages 282-290
Journal: Chemical Engineering Journal - Volume 286, 15 February 2016, Pages 282-290
نویسندگان
Kim Hoong Ng, Chea Hui Lee, Maksudur R. Khan, Chin Kui Cheng,