کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
64738 48368 2016 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of TiO2 phase composition on the photocatalytic activity of TiO2/MWCNT composites prepared by combined sol–gel/hydrothermal method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Influence of TiO2 phase composition on the photocatalytic activity of TiO2/MWCNT composites prepared by combined sol–gel/hydrothermal method
چکیده انگلیسی


• We report combined sol–gel/hydrothermal synthesis of TiO2/MWCNT composites.
• Phase and morphology controlling effect of H+ concentration was investigated.
• Samples showed considerable photocatalytic activity in salicylic acid degradation.
• Low rutile content composites show enhances the photocatalytic activity.

Titanium dioxide/multiwall carbon nanotube (TiO2/MWCNT) composites were prepared by sol–gel method with hydrolysis of titanium alkoxide precursor followed by crystallization via hydrothermal treatment at different acid concentrations. Transmission electron microscopy (TEM) measurements revealed that the acid concentration has serious control over the morphology which is in good agreement with the change of specific surface area. According to the X-ray diffraction analysis of the samples the anatase/rutile ratio of the TiO2 in the composite can be tuned by the manipulation of acid concentration used for the hydrothermal crystallization. Samples were tested in aqueous-phase photocatalytic degradation reaction of salicylic acid in a batch-type foam reactor using relatively low power UV-A irradiation. The change in salicylic acid concentration was monitored by UV–vis spectroscopy technique. Anatase/rutile ratio decreased with increasing acid concentration and photocatalytic performance was decreased with increasing rutile content, however low rutile content (11 wt%) enhanced the photocatalytic efficiency above all prepared samples.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis A: Chemical - Volume 414, April 2016, Pages 140–147
نویسندگان
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