کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1695422 1011859 2011 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and characterization of kaolinite/TiO2 nano-photocatalysts
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
Synthesis and characterization of kaolinite/TiO2 nano-photocatalysts
چکیده انگلیسی

Kaolinite/TiO2 nano-photocatalysts were prepared by TiCl4 hydrolysis method. The materials were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), photoluminescence (PL), ultraviolet–visible diffuse reflection spectroscopy (UV–vis DRS) and scanning electron microscopy (SEM). The photocatalytic activity was evaluated by the degradation of methyl orange in aqueous solution. The results show that kaolinite facilitates the formation of anatase, restrains the transformation of anatase to rutile and causes the absorption edge of TiO2 shift to higher energy region. TiOSi bonds form on the interface of kaolinite and TiO2. TiO2/kaolinite calcined at 200 °C shows a high photocatalytic activity due to the smaller crystallite size, the abundant surface oxygen vacancies and defects, and the lower recombination rate of electron–hole pairs of anatase TiO2.

Figure optionsDownload as PowerPoint slideResearch highlights
► Kaolinite/TiO2 nano-photocatalysts were prepared by TiCl4 hydrolysis method.
► Kaolinite facilitates the formation of anatase, restrains the transformation of anatase.
► Kaolinite causes the absorption edge of TiO2 shift to higher energy region.
► TiO2/kaolinite calcined at 200 °C shows high photocatalytic activity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Clay Science - Volume 53, Issue 4, October 2011, Pages 646–649
نویسندگان
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