کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7888922 | 1509796 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced photocatalytic activity of porous single crystal TiO2/CNT composites by annealing process
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
To improve the photocatalytic performance of anatase TiO2 (a-TiO2), it is necessary to simultaneously increase its crystallinity and surface area. Our approach to achieve the desired morphology is to develop a porous single crystal that can be transformed from its mesocrystal form via annealing. We synthesized a-TiO2 mesocrystals onto multiwalled CNTs using a facile one-pot chemical approach, and investigated the effect of the annealing temperature (200-600 °C) on the crystallinity, morphology, chemical bonding state, and photocatalytic performance of the TiO2/CNT composites. The as-grown sample and sample annealed at 200 °C consisted of spindle-like a-TiO2 mesocrystals. As the annealing temperature increased to 400 °C, the morphology of a-TiO2 changed from mesocrystals into porous single crystals and the surface area enlarged due to the thermo-decomposition of organic residues between the subunits. The chemical bonding (Ti-O-C) between TiO2 and CNT was also strengthened with increasing annealing temperature. On the other hand, the TiO2 was separated from the CNT at 600 °C because of the large difference in the thermal expansion coefficients. The photocatalytic performance of the TiO2/CNT composites was the highest at 400 °C due to the increased crystallinity, removal of the by-products, and strengthened Ti-O-C bonds, resulting in an increase in the photocatalytic active sites and efficient charge separation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 2, 1 February 2018, Pages 1641-1645
Journal: Ceramics International - Volume 44, Issue 2, 1 February 2018, Pages 1641-1645
نویسندگان
Chae Hee Park, Chang Min Lee, Jong Won Choi, Geun Chul Park, Jinho Joo,