Self-cleaning properties of polyester fabrics coated with flower-like TiO2 particles and trimethoxy (octadecyl)silane
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The presented work reported the growth of 3D-shaped TiO 2 flower particles on the surface of polyester fabrics using two step approaches of sol–gel technology and hydrothermal method. The scanning electron microscopy, EDS analysis, Raman spectroscopy, and X-ray diffraction techniques were employed to study the effect of titanium isopropoxide (TTIP) concentration on the growth of flower-like TiO 2 microstructures. Later, a layer of trimethoxy(octadecyl)silane was applied on TiO 2 -coated polyester fabrics to fabricate the self-cleaning textiles. The physical self-cleaning properties were examined based on superhydrophobicity and contact angle measurements, where maximum static contact angle of 160.1 o and minimum roll off angle of 3° was found for 2 mL TTIP concentration. The degradation of methyl orange dyes under UV light irradiation was observed to confirm the photocatalytic chemical self-cleaning behavior, where the samples coated with 2 mL TTIP decolorized the dye solution in 150 min, whereas the samples coated with 1 mL and 1.5 mL TTIP took almost 300 and 210 min, respectively.Keywords:
Methyl orange
In this paper, p-n coupled photocatalyst CoO/CdS/TiO 2 was prepared by method of impregnation. The structure and optical properties of CdS/TiO2 and CoO/CdS/TiO 2 were characterized by XRD, SEM, BET and UV–vis DRS. The photocatalytic activities of the photocatalysts were evaluated by photocatalytic degradation of methyl orange, and the effect of photocorrosion of CdS in CoO/CdS/TiO 2 was investigated by analyzing the cadmium concentration in the supernate collected after photocatalytic reactions. The results showed that p-n coupled photocatalyst CoO/CdS/TiO 2 not only showed higher efficiency in degradation of methyl orange than CdS/TiO 2 , but also exhibited resistance against cadmium leakage under light irradiation. The mechanism of the photocorrosion-delaying by p–n junction was also discussed.
Methyl orange
Cadmium sulfide
Degradation
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BiVO4 hollow nano-fiber photocatalytic material was prepared via two steps method of soaking and thermal transition using the cotton fiber as the template. The as-prepared samples were characterized by XRD, SEM and BET. The photocatalytic activity under visible light was evaluated by photocatalytic degradation of methyl orange(MO) in the solution. It was found that the samples calcinated at 400°C for 3.5 h had the hollow tube structure which is the copy of the cotton fibre structure and had the best photocatalytic activity. The decolorization rate of methyl orange can reach to be 97 % or so, increased 16 % than that of sample that prepared with no cotton fiber template. It indicated that the sample’s morphology and the specific surface area was the main reason of higher photocatalytic activity.
Methyl orange
Template method pattern
Degradation
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Fluorine-based amphiphobic coatings have been widely used in commercial textiles to provide water- and oil-repelling abilities. However, few reports from the literature survey have discussed the surface structural effects of the coated substrate on amphiphobicity. In this research, various thickness amphiphobic coatings based on mixed epoxy, tetraethylorthosilicate, and a particular alkoxysilane with fluorinated side chains (F-silane) were deposited on Grade 420 stainless steel plates. Film amphiphobicity is characterized by measuring the water and oil contact angles of the coating. Film morphology is examined using atomic force microscopy. The deposited films free of F-silane are thinner than 150 nm. The films become thick at high F-silane volume percentage with the surface cavities, ridges, and granules being masked out. On the addition of F-silane, the water contact angle of the deposited films increases up to 105° and then reaches a plateau of ∼ 107° with increasing F-silane. In contrast, the oil contact angle increases up to 60° at first and then slowly declines with the F-silane concentration. The total drop of oil contact angle by ∼ 20° was attributed to the masking out of surface features on film thickening. This indicates that the surface oleophobicity depends on surface structures. Therefore, improving surface amphiphobicity correlates with creating more refined multiscale surface structures during the industrial manufacturing process of steel plate, prior to surface modification by F-silane. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41003.
Surface Modification
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Nanomter WO3 - TiO2 composite photocatalyst were prepared by sol-gel method. X -ray reflection diffraction (XRD) spectra and scanning electron microscope (SEM) have Been used to investigate the structural properties and surface morphology of the composite nanopowder. Photocatalytic degradation experiments for 10mg/L Methyl orange solution were performed to inspect the influence of different preparation conditions on its photocatalytic activity. Methyl orange solution photocatalytic degradation has been heightened with the augment of the WO3 -TiO2 Nanopowder ,but the quality of the Nanopowder has a right numerical value in photocatalytic degradation ; Changing the time, Methyl orange solution photocatalytic degradation has been heightened with the extended time,but the photocatalytic degradation ratio of the Methyl orange solution has a right numerical value with prolonged time ; The resultes showed that the composite WO3 -TiO2 Nanopowder with the highest photocatalytic activity was obtained as the doping amount of钨酸钠= 3% and the highest photocatalytic activity was 94. 8%.
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Fe3+ and Al 3+ co-doped TiO2(Fe3+/Al3+-TiO2)composite photocatalysts were prepared by the sol-gel method using Ti(OC4H9)4 as precursor and characterized by X-ray diffraction(XRD)and UV-Vis.The effect of calcination temperature and salts in photocatalytic system on the photocatalytic activity of Fe3+/Al3+-TiO2 were investigated by photocatalytic degradation of methyl orange irradiated by sunlight.The photocatalytic activity of Fe3+/Al3+-TiO2 was enhanced with increasing temperature.HCO3-and NO2-decreased its photocatalytic activity.
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Under ultraviolet radiation,the Nano-TiO2 photocatalytic products can produce hydroxyl(·OH),which is a strong oxidation.It can oxidize I-to produce I2,which can form blue complex with water-soluble starch.Based on this,a new method was proposed for evaluating the photocatalytic activity of photocatalytic products.Compared with the traditional methyl orange degradation method,the proposed method characterized with higher sensitivity and speedy.The proposed method was successful applied to evaluate the photocatalytic activity of some photocatalytic products which bought from market,and the results were more consistent with traditional methyl orange degradation method.
Methyl orange
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Ultraviolet
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Ag doped TiO2 was formed on the surface of carbon nanotube(CNT) by the sol-gel method, and characterized by TEM, XRD. The photocatalytic activity of the Ag-TiO2 /CNT was evaluated in degradation of methyl orange with a 300 W high pressure mercury lamp. Effect of Ag doping quantity on the photocatalytic activity of the photocatalys was investigated.The photocatalytic experiment indicated that the photocatalytic activity was firstly improved and then decreased with an increase of amount of Ag doped in TiO2 nanoparticles,the optimal doping quantity was 0.8% silver （ mass fraction of TiO2）, methyl orange could be degraded 99.3 % by Ag-TiO2/CNT under the optimal conditions after 120min.
Methyl orange
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Mercury-vapor lamp
Titanium Dioxide
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Methyl orange
Hydrothermal Synthesis
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Methyl orange
Titanium oxide
Degradation
Titanium Dioxide
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X-ray photoelectron spectroscopy (XPS) and static contact angle measurements were used to study the interaction between silane coupling agents and cured cement paste. Three different silane coupling agents were investigated: aminopropyltriethoxy silane (APTES), 3-glycidyloxypropyltrimethoxy silane (GPTMS), and methoxy-terminated polydimethxyl siloxane (PDMS). These silanes have different end groups, so the change in surface energy after undergoing a successful reaction between the silane and hydroxyls on the surface of the cement paste was demonstrated by a change in contact angle. Relative to untreated samples, APTES samples decreased the contact angle, PDMS samples increased the contact angle, and GPTMS did not show a significant change in contact angle. Samples with a water-to-cement ratio (w/c) of 0.5 showed a larger change in contact angle than 0.4 w/c ratio samples, because of a greater number of hydroxyl groups at the surface. Deconvolution of the O 1s and Si 2p XPS peaks were performed to determine contributions from bridging and nonbridging atoms. An increase in bridging silicon and oxygen atoms relative to untreated samples indicated successful silane condensation and that a covalent bond was formed between the cement paste and silanes.
Silanes
Siloxane
Surface Modification
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