کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
221530 464260 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transition metal doped anatase nanocrystals: Continuous-flow hydrothermal synthesis and photocatalytic activity
ترجمه فارسی عنوان
فلزات واسطه آلایش شده با نانوبلورهای آناتاز: به طور مداوم جریان سنتز هیدروترمال و فعالیت فوتوکاتالیستی
کلمات کلیدی
سنتز با جریان پیوسته؛ آناتاز؛ دوپینگ؛ نانوذرات فوتوکاتالیست
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی

Transition metal doped anatase nanoparticles have been prepared by a continuous-flow hydrothermal method. An aqueous solution containing a titanium source and appropriate amounts of cobalt or nickel nitrate is mixed in-flow with potassium hydroxide as a mineraliser before meeting a pre-heated stream of supercritical water in a counter-current mixing reactor. Mixing of the metal ion containing solution with supercritical water results in the rapid nucleation of anatase nanocrystals. Powder X-ray diffraction and electron microscopic imaging show that the dopant ions are incorporated into the anatase structure. The incorporation of dopant ions leads to reduced crystallite size and increased surface area. The doped anatase nanocrystals exhibit lower band-gap energies than the undoped material. The photocatalytic activity of the doped and undoped samples has been assessed by monitoring the degradation of methylene blue in the presence of the catalysts under UV illumination. Doping of the anatase nanoparticles significantly increases the photocatalytic activity, with nickel doping showing a pronounced improvement over both the undoped and cobalt doped catalyst nanocrystals.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Chemical Engineering - Volume 4, Issue 3, September 2016, Pages 2665–2670
نویسندگان
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