کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5747203 1618790 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Enhanced activation of periodate by iodine-doped granular activated carbon for organic contaminant degradation
ترجمه فارسی عنوان
فعال سازی پیشرفته دورهداد توسط کربن فعال گرانول خوراکی ید شده برای تخریب آلاینده های آلاینده
کلمات کلیدی
دوره کربن فعال دانه گرانول ید شده، مکانیسم کاتالیزوری، مسیر تخریب،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی


- I-GAC was fabricated and utilized in heterogeneous IO4− oxidation process.
- I-GAC exhibited excellent catalytic activity toward IO4− for AO7 degradation.
- Dominant radical and potential mechanism in I-GAC/IO4− system were investigated.
- Possible degradation pathway of AO7 in the I-GAC/IO4− system was proposed.

In this study, iodine-doped granular activated carbon (I-GAC) was prepared and subsequently applied to activate periodate (IO4−) to degrade organic contaminants at ambient temperature. The physicochemical properties of GAC and I-GAC were examined using scanning electron microscopy, N2 adsorption/desorption, Raman spectroscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. No significant difference was observed between the two except for the existence of triiodide (I3−) and pentaiodide (I5−) on I-GAC. The catalytic activity of I-GAC towards IO4− was evaluated by the degradation of acid orange 7 (AO7), and superior catalytic performance was achieved compared with GAC. The effects of some influential parameters (preparation conditions, initial solution pH, and coexisting anions) on the catalytic ability were also investigated. Based on radical scavenging experiments, it appeared that IO3 was the predominant reactive species in the I-GAC/IO4− system. The mechanism underlying the enhanced catalytic performance of I-GAC could be explained by the introduction of negatively charged I3− and I5− into I-GAC, which induced positive charge density on the surface of I-GAC. This accelerated the interaction between I-GAC and IO4−, and subsequently mediated the increasing generation of iodyl radicals (IO3). Furthermore, a possible degradation pathway of AO7 was proposed according to the intermediate products identified by gas chromatography-mass spectrometry.

190

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 181, August 2017, Pages 609-618
نویسندگان
, , , , , ,