کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6969741 | 1453040 | 2016 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Decolorization of azo dye by peroxymonosulfate activated by carbon nanotube: Radical versus non-radical mechanism
ترجمه فارسی عنوان
رنگ آمیزی رنگ آمیزی از طریق پراکسیمنسوفسفات فعال شده توسط نانولوله کربنی: سازوکار رادیکال در مقابل غیر رادیکال
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کلمات کلیدی
پراکسی مونوسولفات، نانولوله کربنی، رنگ آزو، کلرید، مکانیسم،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
چکیده انگلیسی
Carbon nanotube (CNT) has been shown to effectively activate peroxymonosulfate (PMS) to remove contaminants, whereas controversial activation mechanisms (radical vs non-radical mechanism) were previously proposed. Here we report that radical-induced decolorization of acid orange 7 (AO7) dominated in the CNT activated PMS system, but non-radical mechanism was also involved at high Clâ¿¿ concentration. CNT exhibited high activity in activating PMS to decolorize AO7. The decolorization rate of AO7 increased with increasing PMS dosages and CNT loadings, rising temperature and higher pH. Radical quenching and photoluminescence techniques confirmed the decolorization of AO7 in the CNT/PMS system was caused by the radical oxidation, which dominantly took place on the surface of CNT, rather than the bulk solution. The presence of Clâ¿¿ exhibited a dual effect on AO7 decolorization. Low concentration of Clâ¿¿ slightly inhibited AO7 decolorization, but further raising the concentration to above 0.1Â M significantly accelerated its decolorizaition. Clâ¿¿ was confirmed to react with PMS to generate HClO, which effectively bleached AO7 through non-radical process rather than radical process. The decolorization of AO7 induced from the non-radical process exhibited different degradation products and less mineralization in comparison to that derived from radical process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 320, 15 December 2016, Pages 571-580
Journal: Journal of Hazardous Materials - Volume 320, 15 December 2016, Pages 571-580
نویسندگان
Jiabin Chen, Liming Zhang, Tianyin Huang, Wenwei Li, Ying Wang, Zhongming Wang,