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Shao, Godlisten N.,Imran, S.M.,Abbas, Nadir,Kim, Hee Taik Elsevier 2017 Materials research bulletin Vol.88 No.-
<P><B>Abstract</B></P> <P>Herein the influence of SnO<SUB>2</SUB> on the optical, morphology and phase structure of mesoporous TiO<SUB>2</SUB>-SnO<SUB>2</SUB> composites was examined. Composites with Sn/Ti ratio ranging from 0.1 to 5 were synthesized using less expensive sources in the absence of additives. The obtained samples were examined by XRD, HRTEM, SEM-EDAX, XPS, UV–vis DRS, XRF, TGA and nitrogen gas physisorption studies analyses. The physicochemical properties of the TiO<SUB>2</SUB>-SnO<SUB>2</SUB> systems depended mainly on the Sn-to-Ti ratio, calcination temperature and the interaction between Sn<SUP>4+</SUP>and Ti<SUP>4+</SUP>. XRD results depicted that samples with Sn/Ti=0.1 calcined at ≤600°C exhibited pure anatase TiO<SUB>2</SUB> crystals and the tendency of increasing Sn<SUP>4+</SUP> content facilitated a phase transformation to attain rutile structure. Optical analyses of the samples showed that the absorption of the samples can be extended into the visible region. This study provides a systematic and economical method for large-scale production of TiO<SUB>2</SUB> based composites with desirable properties for various applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A modified sol-gel route to yield TiO<SUB>2</SUB>-SnO<SUB>2</SUB> samples from cheap source is proposed. </LI> <LI> A series of TiO<SUB>2</SUB>-SnO<SUB>2</SUB> samples with different Sn/Ti is systematically synthesized. </LI> <LI> The influence of SnO<SUB>2</SUB> on the mesostructure of TiO<SUB>2</SUB>-SnO<SUB>2</SUB> composites is evaluated. </LI> <LI> Calcined TiO<SUB>2</SUB>-SnO<SUB>2</SUB> composites exhibit superior morphologies and crystal structure. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>SEM images of the TiO<SUB>2</SUB>-SnO<SUB>2</SUB> samples with different Sn-to-Ti ratios calcined at 1100°C.</P> <P>[DISPLAY OMISSION]</P>
Shao, Godlisten N.,Imran, S.M.,Jeon, Sun Jeong,Engole, Marion,Abbas, Nadir,Salman Haider, M.,Kang, Shin Jae,Kim, Hee Taik Elsevier 2014 Powder technology Vol.258 No.-
Photoactive metal oxide systems capable of reducing non-biodegradable pollutants are highly needed heterogeneous catalysts for environmental purification. Most of the currently available heterogeneous catalysts are obtained from complicated synthetic routes using expensive and perhaps hazardous precursors. The present study reports a novel sol-gel method to synthesize pure TiO2 and ZrO2-TiO2 samples using titanium oxychloride as TiO2 precursor and zirconyl nitrate hydrate as a ZrO2 source in the presence of the surfactant. The ratio of Zr-to-Ti was controlled between 0.75 and 3.2 to evaluate the effect of the amount of ZrO2 in the composites. Consequently, the precipitates were calcined at different temperatures to investigate the effect of removing the template at different sintering temperatures. The physico-chemical properties of the samples were examined by SEM, HRTEM, DT-TGA, XRD, FTIR, XRF, EDX, nitrogen gas physisorption and UV-visible diffusive reflectance spectrometry analyses. These analyses revealed that the crystallization, dispersion, particle size and shape of the samples are critically dependent upon the calcination temperatures and Zr-to-Ti ratios. Abnormal grain growth (AGG) was unexpectedly observed in the samples calcined at higher temperatures (<= 800 degrees C). Comparisons of the activities of the samples toward decolorization of methylene blue indicated that the photocatalytic efficiencies of the composites with Zr/ri <= 2.2 were superior to that of pure TiO2. (C) 2014 Elsevier B.V. All rights reserved.
Synthesis of mesoporous titania-silica composite from rice husk and their photocatalytic properties
전순정,( Godlisten N. Shao ),박성수,반가람,김희택 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Mesoporous titania-silica composite was prepared by a facile sol-gel process using cost-effective precursors at low temperature. Silica source was the rice husk, which is an agricultural waste and rich in silica. Rice husk are an excellent source of high-grade amorphous silica. Utilization of rice husk as a resource of silica is based on removal of impurities with low effort and the high specific surface. Silica was extracted fromash as sodium silicate by boiling it in sodium hydroxide solution. The extracted silica source was reacted with Titania sol yielded from titanium oxychloride to form titania-silica composite. The structure of the composite was characterized by FE-SEM, EDAX, TEM, XRD, UV-vis DRS, FTIR and nitrogen gas physisorption studies. These analyses showed that mesoporous titania-silica composites with desirable properties for photocatalysis can be obtained via this facile process.
Nadir Abbas,Godlisten N. Shao,M. Salman Haider,S.M. Imran,박성수,김희택 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
An inexpensive sol–gel technique to synthesize TiO2-Fe2O3 nanocomposites with improved structuraland photochemical properties is introduced. A series of TiO2-Fe2O3 nanocomposites with different Fe2O3contents were prepared through cheap TiO2 precursor titanium oxychloride (TiOCl2). The physicochem-ical properties of the samples were examined by XRD, XRF, SEM, EDX, HRTEM, UV–vis DRS, FTIR, TGA andnitrogen gas physisorption studies. The effects of calcination temperatures and Fe2O3 content on themesostructure and photocatalytic strength of the prepared TiO2-Fe2O3 composites were investigated. Results showed that composites with distinct structural, optical and photochemical properties can beformed by varying Fe2O3 content.
Synthesis of mesoporous silica with superior properties suitable for green tire
Askwar Hilonga,Jong-Kil Kim,Pradip B. Sarawade,Dang Viet Quang,Godlisten N. Shao,Gideon Elineema,김희택 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
In this article we report synthesis of mesoporous silica with superior properties for application in green tire (environmentally friendly tire) as filler. The synthesis was done using a newly innovated apparatus which produce mesoporous silica with superior properties. The desired superior properties are big pore size, optimum BET, large pore volume, uniform properties, and improved performance in real application as tire filler. Mesoporous silica was characterized by BET method and final product with a pore diameter of up to 37 nm was obtained without using surfactants. This is unprecedented step toward synthesis of silica that is suitable for tire industry.