Effect of SiO2 Content on the Catalytic Performance of SiO2-TiO2 Composite Photocatalyst

Zhong, Jianxin; Zeng, Jun; Li, Jianzhang; Huang, Shengtian; Jiang, Weidong; Tang, Zi Long; Li, Minjiao

doi:10.1515/jaots-2014-0113

Cited by 5 publications

(6 citation statements)

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“…The relative intensity of these two bands was found to gradually decrease with increasing calcination temperatures, suggesting the release of adsorbed water and the release of water from silanol group in silica when the sample was subjected to high temperature. The Si-O functional group of silica was indicated by the absorption bands located at wavenumber of 1070 cm -1 and 945 cm -1 , associated with Si-O stretching vibration and band at a wavenumber of 460 cm -1 , associated with Si-O bending vibration 15 . The attachment of sulfate group to silica matrix is indicated by the absorption band at around 1126.43 cm - 1 16 which is observed in the spectra of impregnated samples but not in the spectrum of the original silica.…”

Section: Resultsmentioning

confidence: 99%

“…Sugarcane bagasse silica was selected in recognizing the presence of sugarcane bagasse as agroindustrial residue abundantly available in Indonesia, including the Province of Lampung. In sugar industry, sugarcane bagasse is generally used as fuel for boiler, resulting the ash which consists of 71% SiO 2 and some other metal oxides [14][15][16] . This composition reflects that sugarcane bagasse ash is a potential source of silica.…”

Section: Introductionmentioning

confidence: 99%

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PHYSICAL CHARACTERISTICS AND CATALYTIC ACTIVITY OF SULFATED SUGARCANE BAGASSE SILICA (SiO2/SO3 -H + ) FOR COCONUT OIL TRANSESTERIFICATION

Herlina¹,

Simanjuntak²,

Rilyanti³

et al. 2019

RJC

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In this study, silica extracted from sugarcane bagasse was converted into sulfated silica SiO 2 /SO 3 -H + by impregnating the silica with sulfuric acid to produce sulfated silica. The sulfated silica was then subjected to calcination at varied temperatures, and subsequently analyzed using Fourier Transform Infrared, Scanning Electron Microscope, and X-Ray Diffraction. The catalytic activity of the sulfated silica was tested for transesterification of coconut oil, and the reaction product was analyzed using Gas Chromatography-Mass Spectroscopy. The Fourier Transform Infrared results indicate the presence of absorption band at of 1126.43 cm -1 , which is associated with S=O group, in sulfated silica spectrum, while in the original silica, this band is not detected. This difference between the spectra confirms that the silica was successfully converted into sulfated form. The silica and sulfated silica were found to have similar X-ray difractograms and fit very well with the X-ray difractogram of standard amorphous silica (JCPDS No. 29-0085), confirming the existence silica and sulfated silica as amorphous materials. Characterization using SEM shows the presence of irregular granules on the surface, which is in agreement with amorphous structure as seen by the XRD. Analysis of the transesterification product using GC-MS reveals that the product is composed of methyl esters of the fatty acids composing coconut oil commonly reported, suggesting that the sulfated silica produced possess catalytic activity as expected.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PHYSICAL CHARACTERISTICS AND CATALYTIC ACTIVITY OF SULFATED SUGARCANE BAGASSE SILICA (SiO2/SO3 -H + ) FOR COCONUT OIL TRANSESTERIFICATION

Herlina¹,

Simanjuntak²,

Rilyanti³

et al. 2019

RJC

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“…In this scheme, electrons can easily move and generate more hydroxyl radicals, resulting in the promotion of photocatalytic activities. 39 The self-cleaning performance for every fabric was examined using the following formula…”

Section: Self-cleaning Performance Of Fabricmentioning

confidence: 99%

Modified anti-mosquito and self-cleaning fabrics utilizing clove oil–CuO/TiO₂ composites

Ibadurrohman

Kristianto

Slamet

2022

Textile Research Journal

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We report on the synthesis of CuO/TiO2 composites via a photo-assisted deposition method. The encapsulated clove oil was synthesized using oil-in-water emulsification. The optimum mass ratio of CuO:TiO2 was combined with encapsulated clove oil and then coated on fabric. The obtained CuO/TiO2 composites were examined using scanning electron microscopy to scrutinize their morphology and ultraviolet-visible diffuse reflectance spectra to identify the composites’ absorption range and bandgap energy. The modified fabrics were then characterized using Fourier-transform infrared spectroscopy. The results indicated that CuO/TiO2 samples possess spheroidal shapes, while the absorption spectra of CuO/TiO2 samples were red-shifted to the visible region as the CuO content increased. Photocatalytic activities of TiO2 and CuO/TiO2 were examined by degrading methylene blue under ultraviolet light, which shows that CuO-doped TiO2 exhibits higher activity than TiO2. The self-cleaning functionality of the modified fabrics was examined using sludge solution, revealing that the modified fabrics with CuO/TiO2 composites and encapsulated clove oil (CLO-CuO/TiO2) exhibit cleaner surfaces than blank fabric. The optimum capacity of the fabrics as repellents was obtained in a sample with the smallest average mosquitoes landing of four.

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“…The bands at 3400-3600 cm -1 and 1630 cm -1 are assigned to OH bending and strecthing vibrations respectively. It can be defined as a Ti-OH, Si-OH, and O-H bending related to physically absorbed moisture (interaction of hydrogen bonds with water molecule) 26) , the bands at 1060-1220 cm -1 is the characteristic bonds of Si-O-Si asymmetric stretching and at 941 cm -1 refers to Ti-O-Si asymmetric stretching, thus the Ti-O-Si bond were developed when the calcination process occured, The effect of Ti-O-Si bond can increase the surface hydrophilicity of the nanocomposite, so it could adsorbed more H2O at the surface of the nanocomposite. The peak at 590-647 cm -1 were the characteristic of Ti-O-Ti bonding which attributed to TiO2.…”

Section: Characteristic Of the Nanocompositementioning

confidence: 99%

Synthesis of TiO_2-SiO_2-CuO Nanocomposite Material and Its Activities for Self-cleaning

Dwirekso

Ibadurrohman²,

Slamet³

2020

Evergreen

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Synthesis of TiO2-SiO2-CuO nanocomposite material have been prepared by Photo Assisted Deposition (PAD) and Stober method to obtain self-cleaning material which is useful for life commodity. The self-cleaning ability were measured by its hydrophilicity, furthermore, the nanocomposite also have been evaluated for its performance in the decolorization of methylene blue. The order of PAD and Stober method in nanocomposite synthesis were adjusted for different nanocomposite morphology. The characteristic of TiO2-SiO2-CuO nanocomposite consist the chemical bonding of Ti-O-Si which could enhance its hydrophilicity for self-cleaning purposes and the CuO dopant in the nanocomposite enhance the light responses to visible region. The SiO2 addition affect the morphological structure, then enhance the nanocomposite surface area, adsorption of methylene blue, and its hydrophilicity. So the TiO2-SiO2-CuO nanocomposite exhibit much higher performance in decolorization of methylene blue which could reach 80% for 5 minutes and has 6 0 contact angle compared with CuO-TiO2. The morphology 1 nanocomposite which most of the CuO were at TiO2 lattice possess superior self-cleaning ability than the morphology 2 nanocomposite which most of the CuO inhibits SiO2.

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Effect of SiO2 Content on the Catalytic Performance of SiO2-TiO2 Composite Photocatalyst

Abstract: SiO

Cited by 5 publications

References 0 publications

PHYSICAL CHARACTERISTICS AND CATALYTIC ACTIVITY OF SULFATED SUGARCANE BAGASSE SILICA (SiO2/SO3 -H + ) FOR COCONUT OIL TRANSESTERIFICATION

PHYSICAL CHARACTERISTICS AND CATALYTIC ACTIVITY OF SULFATED SUGARCANE BAGASSE SILICA (SiO2/SO3 -H + ) FOR COCONUT OIL TRANSESTERIFICATION

Modified anti-mosquito and self-cleaning fabrics utilizing clove oil–CuO/TiO₂ composites

Synthesis of TiO_2-SiO_2-CuO Nanocomposite Material and Its Activities for Self-cleaning

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Effect of SiO2 Content on the Catalytic Performance of SiO2-TiO2 Composite Photocatalyst

Abstract: SiO

Cited by 5 publications

References 0 publications

PHYSICAL CHARACTERISTICS AND CATALYTIC ACTIVITY OF SULFATED SUGARCANE BAGASSE SILICA (SiO2/SO3 -H + ) FOR COCONUT OIL TRANSESTERIFICATION

PHYSICAL CHARACTERISTICS AND CATALYTIC ACTIVITY OF SULFATED SUGARCANE BAGASSE SILICA (SiO2/SO3 -H + ) FOR COCONUT OIL TRANSESTERIFICATION

Modified anti-mosquito and self-cleaning fabrics utilizing clove oil–CuO/TiO2 composites

Synthesis of TiO_2-SiO_2-CuO Nanocomposite Material and Its Activities for Self-cleaning

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Modified anti-mosquito and self-cleaning fabrics utilizing clove oil–CuO/TiO₂ composites