THE STABILITY OF SUPERHYDROPHOBIC COTTON FABRICS PREPARED BY SOL–GEL COATING OF SiO2 AND TiO2

2013 ◽  
Vol 20 (06) ◽  
pp. 1350064 ◽  
Author(s):  
XUE-WEI WANG ◽  
CUI GUO ◽  
ZHI-HAO YUAN
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Volume Ratio ◽  
Sodium Silicate Solution ◽  
Cotton Fabrics ◽  
Contact Angles ◽  
Light Irradiation ◽  
Water Contact ◽  
Uv Light Irradiation ◽  
Silica And Titania

Superhydrophobic cotton fabrics are prepared using silica and titania hybrid sol and hexadecyltrimethoxysilane. The surface morphology of cotton fabrics is characterized by scanning electron microscopy. The water contact angles on the as-prepared superhydrophobic cotton fabrics is 159° when the volume ratio between sodium silicate solution and titania sol is 1:3, and the corresponding cotton fabrics can keep the contact angle of 152° after 10 cycles of home machine washing. Meanwhile the treated cotton fabrics can also keep superhydrophobicity after 60 min of UV light irradiation. These results indicate that the cotton fabrics treated with silica and titania hybrid sol and modified with hexadecyltrimethoxysilane show excellent superhydrophobic stability under washing and UV light irradiation. This paper provides the new notion and beneficial reference for the application of the superhydrophobic cotton fabrics in the future.

Effective of SiO2 Addition on the Self-Cleaning and Photocatalytic Properties of TiO2 Films by Sol-Gel Process

2009 ◽  
Vol 620-622 ◽  
pp. 679-682 ◽  
Author(s):  
Dae Yong Shin ◽  
Kyung Nam Kim
Keyword(s):  
Photocatalytic Activity ◽  
Uv Light ◽  
Sol Gel ◽  
Light Irradiation ◽  
Photocatalytic Properties ◽  
Water Contact ◽  
Sio2 Films ◽  
Uv Light Irradiation ◽  
Sol Gel Process ◽  
Self Cleaning

Thin films of various composition in the system of TiO2•SiO2 have been fabricated by the sol-gel process using Si(OC2H5) and Ti(OC3H7i)4 as precursors. TiO2•SiO2 films were formed on the glass substrate by spin-coating technique and heated at 500°C for 1 h. The relationship between hydrophilicity, photocatalytic properties and self-cleaning property with SiO2 addition and UV light irradiation were investigated. Photocatalytic activity of TiO2•SiO2 films showed decomposition of ~97% of acetaldehyde in 2 h and a water contact angle of ~10°. TiO2•SiO2 films can have more hydrophilic activity and less photocatalytic activity by increasing of SiO2 addition. XPS measurements revealed that the amount of organic compounds adsorbed on the films decreased with the UV light irradiation and SiO2 addition, because of the increased of both OH group contents in films and decomposed organic contaminants of the films surface.

scholarly journals TiO2-Powdered Activated Carbon (TiO2/PAC) for Removal and Photocatalytic Properties of 2-Methylisoborneol (2-MIB) in Water

Water ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1622
Author(s):  
Xiao-Pin Guo ◽  
Peng Zang ◽  
Yong-Mei Li ◽  
Dong-Su Bi
Keyword(s):  
Activated Carbon ◽  
Natural Organic Matter ◽  
Uv Light ◽  
Sol Gel ◽  
Light Irradiation ◽  
Nano Tio2 ◽  
Uv Light Irradiation ◽  
Adsorption Capacities ◽  
Taste And Odor ◽  
Composite Photocatalysts

2-methylisoborneol (2-MIB) is a common taste and odor compound caused by off-flavor secondary metabolites, which represents one of the greatest challenges for drinking water utilities worldwide. A TiO2-coated activated carbon (TiO2/PAC) has been synthesized using the sol-gel method. A new TiO2/PAC photocatalyst has been successfully employed in photodegradation of 2-MIB under UV light irradiation. In addition, the combined results of XRD, SEM-EDX, FTIR and UV-Vis suggested that the nano-TiO2 had been successfully loaded on the surface of PAC. Experimental results of 2-MIB removal indicated that the adsorption capacities of PAC for 2-MIB were higher than that of TiO2/PAC. However, in the natural organic matter (NOM) bearing water, the removal efficiency of 2-MIB by TiO2/PAC and PAC were 97.8% and 65.4%, respectively, under UV light irradiation. Moreover, it was shown that the presence of NOMs had a distinct effect on the removal of MIB by TiO2/PAC and PAC. In addition, a simplified equivalent background compound (SEBC) model could not only be used to describe the competitive adsorption of MIB and NOM, but also represent the photocatalytic process. In comparison to other related studies, there are a few novel composite photocatalysts that could efficiently and rapidly remove MIB by the combination of adsorption and photocatalysis.

scholarly journals Investigation of the photocatalytic efficiency of tantalum alkoxy carboxylate-derived Ta2O5 nanoparticles in rhodamine B removal

2017 ◽  
Vol 8 ◽  
pp. 604-613 ◽  
Author(s):  
Subia Ambreen ◽  
Mohammad Danish ◽  
Narendra D Pandey ◽  
Ashutosh Pandey
Keyword(s):  
Rhodamine B ◽  
Uv Light ◽  
Sol Gel ◽  
Light Irradiation ◽  
Photocatalytic Efficiency ◽  
Uv Light Irradiation ◽  
Sol Gel Synthesis

Ta2O5 nanoparticles have been synthesized from alkoxy carboxylates of tantalum via the sol–gel route. Tantalum alkoxides were reacted with chlorocarboxylic acids in order to lower the susceptibility hydrolysis. When these modified alkoxy carboxylates were used in the sol–gel synthesis, they yielded Ta2O5 nanoparticles of better properties than those of the alkoxide-derived Ta2O5 nanoparticles. These nanoparticles efficiently removed rhodamine B under UV light irradiation.

Photocatalytic and Sonophotocatalytic Activity of Magnetic Heterogeneous Fe3O4/TiO2/CuO Catalyst

2016 ◽  
Vol 864 ◽  
pp. 128-133
Author(s):  
Ardiansyah Taufik ◽  
Shofianina Djalaluidin ◽  
Rosari Saleh
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Ultrasound Irradiation ◽  
Catalytic Performance ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Ferromagnetic Behavior ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Result Show

Magnetic heterogeneous Fe3O4/TiO2/CuO catalyst were synthesized using sol-gel method. The molar ratio of Fe3O4/TiO2/CuO were varied from 1:1:0.1 until 1:1:5. The all synthesized catalyst were characterized using X-ray Diffraction (XRD), Energy Dispersive X-ray (EDX), Field Emission Scanning Electron Microscope (FE-SEM), and Vibrating Sample Magnetometer (VSM). The result show that the magnetic heterogeneous Fe3O4/TiO2/CuO catalyst exhibit ferromagnetic behavior under room temperature. The catalytic performance were evaluated on the degradation of methylene blue under UV light and combination of ultrasound and UV-light Irradiation. The combination of ultrasound and UV-light irradiation exhibit batter catalytic performance than ultrasound irradiation only. The Magnetic heterogeneous Fe3O4/TiO2/CuO with molar ratio 1:1:0.1 shows highest catalytic performance. The reusability of catalyst were also observed.

scholarly journals Preparation of TiO2/Activated Carbon Composites for Photocatalytic Degradation of RhB under UV Light Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Baolin Xing ◽  
Changliang Shi ◽  
Chuanxiang Zhang ◽  
Guiyun Yi ◽  
Lunjian Chen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Electron Microscope ◽  
Uv Light ◽  
Removal Rate ◽  
Sol Gel ◽  
Light Irradiation ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Loading Amount

Photocatalysts comprising nanosized TiO2particles on activated carbon (AC) were prepared by a sol-gel method. The TiO2/AC composites were characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, nitrogen adsorption, scanning electron microscope (SEM), transmission electron microscope (TEM), and energy dispersive X-ray (EDX). Their photocatalytic activities were studied through the degradation of Rhodamine B (RhB) in photocatalytic reactor at room temperature under ultraviolet (UV) light irradiation and the effect of loading cycles of TiO2on the structural properties and photocatalytic activity of TiO2/AC composites was also investigated. The results indicate that the anatase TiO2particles with a crystal size of 10–20 nm can be deposited homogeneously on the AC surface under calcination at 500°C. The loading cycle plays an important role in controlling the loading amount of TiO2and morphological structure and photocatalytic activity of TiO2/AC composites. The porosity parameters of these composite photocatalysts such as specific surface area and total pore volume decrease whereas the loading amount of TiO2increases. The TiO2/AC composite synthesized at 2 loading cycles exhibits a high photocatalytic activity in terms of the loading amount of TiO2and as high as 93.2% removal rate for RhB from the 400 mL solution at initial concentration of 2 × 10−5 mol/L under UV light irradiation.

Preliminary Study of ZnO/GO Composite Preparation as Photocatalyst Material for Degradation Methylene Blue under Low UV-Light Irradiation

2021 ◽  
Vol 1028 ◽  
pp. 319-325
Author(s):  
Annisa Aprilia ◽  
Rizkia Mutiara ◽  
Choiry Ghina Afrilia ◽  
Ayi Bahtiar ◽  
Sri Suryaningsih ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Uv Light ◽  
Sol Gel ◽  
Photocatalytic Property ◽  
Precursor Solution ◽  
Light Irradiation ◽  
Hexagonal Wurtzite Crystal Structure ◽  
Uv Light Irradiation ◽  
Photodegradation Rate

ZnO:Graphene Oxide composite nanopowders have been successfully prepared by sol-gel method. The study of composite preparation is discussed in this paper. Graphene oxide was added in two ways in order to study the mixed behaviour especially in photocatalytic properties. The degradation of methylene blue (MB) concentration in water was used to evaluate the photocatalytic property under low UV-light irradiation (14 μW/cm2). The results showed that all varian ZnO-GO composite samples have spherical morphology and hexagonal wurtzite crystal structure. An addition of graphene oxide (GO) in ZnO precursor solution during preparation shows a better photocatalytic property that related to reducing in particle size, thereby produce a large surface area and formed a better interfacing with GO/rGO. The existence of GO around ZnO nanoparticles gives some advantageous due to presences of hydroxyl component that directly relate to the increments in photocatalytic behavior. The photodegradation rate of MB in water using ZnO-GO composite as catalyst is significantly increase compared with pure ZnO.

Low-Temperature Processing and Optical Hydrogen Gas Sensing Property of Pd-Loaded Titania Coating onto Flexible Plastic Substrate

2013 ◽  
Vol 566 ◽  
pp. 249-252 ◽  
Author(s):  
Junichi Hamagami ◽  
Shohei Onimaru ◽  
Ryo Araki ◽  
G. Kawamura ◽  
Atsunori Matsuda
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Uv Light ◽  
Sol Gel ◽  
Hydrogen Gas ◽  
Hot Water ◽  
Light Irradiation ◽  
Plastic Substrate ◽  
Uv Light Irradiation ◽  
Titania Coating

Transparent titania coating was formed onto a flexible polycarbonate plastic substrate by low-temperature fabrication process below 100 °C consisting of a sol-gel technique and a hot water treatment method. The titania coating with high transparency showed a good photocatalytic activity under ultraviolet (UV) light irradiation. Palladium metal acts as a catalyst for dissociative adsorption of hydrogen gas at room temperature under an atmospheric pressure. The palladium catalyst was deposited on the photocatalytic titania coating by a photodeposition process at room temperature under UV-light irradiation. The flexible polycarbonate plastic sheet with semitransparent palladium-deposited titania coating works as an optically readable hydrogen gas sensor which can operate at room temperature.

Preparation of a Novel Red Long Lasting Phosphorescent Material CaAl2Si2O8:Mn2+ and Investigation of its Luminescent Properties

2011 ◽  
Vol 71-78 ◽  
pp. 3151-3155 ◽  
Author(s):  
Bi Sang Chen ◽  
Zi Shan Zheng ◽  
Yan Mei Lin ◽  
Guo Liang Chen ◽  
Liang Zhou ◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Light Irradiation ◽  
Gel Method ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Phosphorescent Material ◽  
Fluorescence Spectrometer ◽  
Dark Room

A novel red long-lasting phosphor CaAl2Si2O8:Mn2+ was successfully synthesized by sol-gel method. X-ray diffractometer(XRD) and fluorescence spectrometer were used to characterize the structure and photoluminescence of the persistent phosphors, respectively. Under UV light irradiation, this phosphor showed obvious long-lasting phosphorescence that can be clearly seen with naked eyes in a dark room for 18 min after the irradiation source has been removed. Thermoluminescence measurement showed that the phosphor has an appropriate energy depth of 0.43 ev.

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