کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5746162 1618791 2017 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mechanism insight of PFOA degradation by ZnO assisted-photocatalytic ozonation: Efficiency and intermediates
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Mechanism insight of PFOA degradation by ZnO assisted-photocatalytic ozonation: Efficiency and intermediates
چکیده انگلیسی


- PFOA was degraded by photo-generated holes and hydroxyl radicals.
- A synergistic effect was found between photo-generated holes and hydroxyl radicals.
- Initial solution pH and temperature played important roles in PFOA degradation.
- C2−C7 shorter-chain perfluorocarboxylic acids and F− were major intermediates.

Zinc oxide (ZnO) nanorods were prepared by a directly pyrolysis method and employed as catalyst for perfluorooctanoic acid (PFOA) degradation. Comparative experiments were conducted to discuss the catalytic activity and flexibility of ZnO. After ZnO addition, the best PFOA degradation efficiency (70.5%) was achieved by ZnO/UV/O3 system, only 9.5% by sole ozonation and 18.2% by UV254 light irradiation. PFOA degradation was sensitive with pH value and temperature. The better PFOA removal efficiency was achieved at acidic condition. A novel relationship was found among PFOA degradation efficiency with hydroxyl radicals and photo-generated holes. Hydroxyl radicals generated on the surfaces of ZnO nanorods played dominant roles in PFOA degradation. PFOA degradation was found to follow the photo-Kolbe reaction mechanism. C2-C7 shorter-chain perfluorocarboxylic acids and fluoride ion were detected as main intermediates during PFOA degradation process. Based on the results, a proposal degradation pathway was raised.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 180, August 2017, Pages 247-252
نویسندگان
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