1403/01/09

محمد جواد چایچی

مرتبه علمی: استاد
ارکید:
تحصیلات: دکترای تخصصی
اسکاپوس:
دانشکده: دانشکده شیمی
نشانی:
تلفن: 9113120679

مشخصات پژوهش

عنوان
Preparation of titanium dioxide nanoparticles supported on hexagonal mesoporous silicate (HMS) modified by oak gall tannin and its photocatalytic performance in degradation of azo dye
نوع پژوهش
JournalPaper
کلیدواژه‌ها
Photocatalyst, TiO2, Hexagonal mesoporous silicate (HMS), Tannin, Azo dye
سال
2016
مجله ADVANCED POWDER TECHNOLOGY
شناسه DOI
پژوهشگران Ehsan Binaeian ، Nasser Seghatoleslami ، Mohammad Javad Chaichi ، Habib-allah Tayebi

چکیده

In this study, a new type of photocatalyst, TiO2 based on hexagonal mesoporous silicate (HMS) loaded by different concentrations of natural polyphenol oak gall tannin,OGT, (TiO2–OGTx-HMS, x = 0.3, 0.6, 1 wt.%) was synthesized and used in batch photocatalytic experiments. The synthesized catalysts were characterized using XRD, SEM, EDX and TEM analysis. The analysis showed that tannin was immobilized on the surface of HMS and TiO2 nanoparticles were distributed well and uniform on the surface of OGT-HMS without aggregation, while TiO2 nanoprticles aggregated on the surface of tannin free HMS. The performance of TiO2–OGTx-HMS phtocatalysts for degredation of anionic dye (i.e., Direct yellow 86) in aqueous solution were also compared with the performance of TiO2 (P-25) and TiO2–HMS. TiO2–OGT0.6%-HMS Photocatalyst exhibited higher performance than that of other photocatalysts with the adsorption and degradation efficiencies of 36.7% and 92.2%, respectively. The relative high value of activation energy, 24.8 kJ/mol, confirms the effect of temperature to accelerate the photocatalytic reaction. It was also shown that photocatalytic reaction follows first order kinetic and up to 120 mg/l of dye solution, Langmuir–Hinshelwood (L–H) kinetic model is acceptable.