scholarly journals TiO2 Transparent Thin Film for Eliminating Toluene

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Suhaina M. Ibrahim ◽  
Nobuaki Negishi ◽  
Abdul Kadir Masrom ◽  
Babak Mazinani ◽  
Anita Ramli ◽  
...  
Keyword(s):  
Thin Film ◽  
Phase Transition ◽  
Carbon Dioxide ◽  
Contact Angle ◽  
Photocatalytic Oxidation ◽  
Single Phase ◽  
Uv Light ◽  
Low Cost ◽  
Dip Coating ◽  
Volatile Organic

TiO2 nanoparticles undergo a single-phase transition: from amorphous to anatase when calcined at 450°C. It can be noticed from the XRD and AFM results that the particle size of TiO2 is below 30 nm. Results from viscometer and UV-Vis analysis showed that the film thickness is closely related to the viscosity of dip-coating solutions. It was found that the contact angle for water decreased after being illuminated with UV light at certain periods of time. This indicates that these films exhibit hydrophilic properties that can be used on self-cleaning surfaces and antifogging mirrors. Heterogeneous photocatalytic oxidation allows the oxidation of airborne volatile organic compounds (VOCs) into carbon dioxide and water in the presence of a semiconductor catalyst and UV light source. Titanium dioxide, due to its chemical stability, nontoxicity, and low cost, represents one of the most efficient photocatalysts. Photocatalytic activity of the TiO2 thin films was evaluated by using toluene and results showed that this film is successful in decomposing toluene.

Effect of ZnO on a Superhydrophilic Self-Cleaning Properties of TiO2/SiO2 Thin Film on Glass Slide Substrate

2015 ◽  
Vol 1131 ◽  
pp. 237-241 ◽  
Author(s):  
Akkarat Wongkaew ◽  
Chanida Soontornkallapaki ◽  
Naritsara Amhae ◽  
Wichet Lamai
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Visible Light ◽  
Band Gap ◽  
Sol Gel ◽  
Dip Coating ◽  
Band Gap Energy ◽  
Gap Energy ◽  
Coating Method ◽  
Dip Coating Method

This work aims to study the effect of ZnO containing in TiO2/SiO2 film on the superhydrophilic property after exposed to different types of light. The metal solutions were prepared by sol-gel technique and the film was deposited on glass slides by dip coating method. The parameter studied was the amount of ZnO in the TiO2/SiO2 film. The contents of ZnO were 5-20% weight (increased by 5%). The amount of TiO2 was constant at 30% weight. The obtained films were analyzed for their roughness. The results indicated that film roughness changed according to the ZnO contents. With 5%ZnO in the thin film, the roughness was 0.726 nm while 20%ZnO obtained the roughness of 2.128 nm. UV-Vis spectrophotometer was used for measuring of transmittance of films. At wavelength of 550 nm, the transmittances of each film were greater than 90%. Band gap energy of each film was calculated from the transmittance data. It was found that the average band gap energy of the films was 2.47 eV. Then, the films contained various amount of ZnO were grouped into 2 sets. The first set was exposed to visible light while the other set was exposed to UV. The duration of exposure was 5 hr. Both sets of films after exposed to any light were kept in a black box controlled relative humidity of 85%. Each film was measured contact angle every day. It was found that the 30%TiO2/5%Zn/SiO2 film exposed to visible light showed the best superhydrophilic property. The contact angle was about 0-5° within 3 days. This may due to the reduction of band gap energy in the presence of ZnO in TiO2/SiO2 films to 2.41 eV and the roughness of the film.

Fabrication of polysiloxane-modified polyurethane sponge as low-cost organics/water separation and selective absorption material

2016 ◽  
Vol 74 (8) ◽  
pp. 1936-1945 ◽  
Author(s):  
Zhengshan Cui ◽  
Wanxia He ◽  
Jun Liu ◽  
Wei Wei ◽  
Liang Jiang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Mechanical Stability ◽  
Low Cost ◽  
Sol Gel ◽  
Dip Coating ◽  
Selective Absorption ◽  
Large Area ◽  
Water Separation ◽  
Good Thermal Stability ◽  
Polyurethane Sponge

Through sol-gel and dip-coating processes, commercial polyurethane sponge modified by polysiloxane was fabricated under low temperature (60 °C) and atmosphere. The contact angle of the obtained polysiloxane/polyurethane sponge is 145 ± 5°. Hence, the polysiloxane/polyurethane sponge could float on water and selectively absorb organics from the surface of the water, indicating simultaneous properties of hydrophobicity and oleophilicity. The absorbent maximum value is 50–150 times of its own weight. The polysiloxane/polyurethane sponge exhibited excellent recyclability, which could be reused by squeezing the sponge due to its high mechanical stability and flexibility. Thermogravimetry-differential thermal analysis test indicated that the polysiloxane/polyurethane sponge exhibited good thermal stability and the stable contact angle of samples tested under increasing temperature indicated its good weather resistance. Due to the commercial property of polyurethane sponge and easy-handling of polysiloxane, the polysiloxane/polyurethane sponge can be easily scaled up to recover a large-area oil spill in water and further work based on the designed equipment has been under consideration.

Zinc Oxide Thin Film Synthesized by Sol-Gel Method

2020 ◽  
Vol 307 ◽  
pp. 51-57
Author(s):  
Amna Afiqah Nasution Hakim ◽  
Affa Rozana Abdul Rashid ◽  
N. Arsad ◽  
Aisyah Hanim Surani
Keyword(s):  
Thin Film ◽  
Uv Light ◽  
Zinc Acetate Dihydrate ◽  
Sol Gel ◽  
Dip Coating ◽  
Oxide Thin Film ◽  
Gel Method ◽  
Sol Gel Method ◽  
Crystallite Sizes ◽  
Surface Morphologies

ZnO thin films have been prepared by the dip coating sol gel method. Zinc acetate dihydrate, 2-methoxyethanol and monoethanolamine (MEA) were used as precursor, solvent and stabilizer respectively. The synthesized sample was coated on glass substrate as the molarity of the solution was kept constant at 0.1 M. The structural properties and surface morphologies of ZnO thin film were characterized by XRD and FESEM. The optical properties such as transmittance, absorbance, reflectance and refractive index were studied by using UV-Vis. The functional group of the synthesized sample were verified by using FTIR. Average crystallite sizes of the samples were calculated by using Debye-Scherrer's formula. Next, ZnO is coated on POF in order to examine the reaction towards UV light.

Gas-Phase Destruction of VOCs Using TiO2/UV and TiO2/O3/UV

1998 ◽  
Vol 3 (2) ◽  
Author(s):  
Rosana M. Alberici ◽  
Wilson F. Jardim
Keyword(s):  
Thin Film ◽  
Volatile Organic Compounds ◽  
Gas Phase ◽  
Organic Compounds ◽  
Aromatic Compounds ◽  
Photocatalytic Oxidation ◽  
Catalyst Deactivation ◽  
Volatile Organic ◽  
Film Reactor ◽  
Catalytic Deactivation

AbstractGas-phase photocatalytic oxidation of different classes of volatile organic compounds (VOCs), including alkanes, ketones, alcohols, chlorinated compounds and aromatic compounds, was investigated using an annular thin film reactor. For all organic compounds tested, catalytic deactivation was not observed, except for toluene (506 ppmv). For this compound, maximum destruction (87%) was maintained during the first 60 min of irradiation, dropping steadily due to catalyst deactivation to 20% after 150 min. The use of ozone as auxiliary agent in the photocatalytic oxidation of toluene and pyridine was also tested. For toluene, when O

Degradasi Gas Benzena Melalui Proses Pemangkinanfoto Saput Tipis TiO2

2012 ◽  
Author(s):  
Wan Azelee Wan Abu Bakar ◽  
Mohd Yusof Othman ◽  
Noor Khaida Wati Mohd Saiyudi ◽  
Keiichi Tanaka
Keyword(s):  
Thin Film ◽  
Light Source ◽  
Tio2 Thin Film ◽  
Uv Light ◽  
Wave Length ◽  
Sol Gel ◽  
Dip Coating ◽  
Optimum Ratio ◽  
Coating Method ◽  
Dip Coating Method

Pengoksidaanfoto benzena fasa gas menggunakan saput tipis TiO2 yang disinari lampu ultralembayung telah dikaji. Saput tipis ini disediakan melalui kaedah celup angkat menggunakan sol–gel TiO2. Tindak balas yang sama juga telah dijalankan menggunakan saput tipis TiO2 yang didop dengan Cu2+ dan Fe3+ dengan nisbah mol TiO2 terhadap ion logam 1:0.005, 1:0.001, 1:0.0005 dan 1:0.0003. Hasil kajian menunjukkan mangkin TiO2 dengan pancaran cahaya UV (354 nm) mendegradasikan gas benzena sebanyak 90% dalam masa 55 minit. Walau bagaimanapun penambahan ion Fe3+ dengan nisbah 1:0.0005 meningkatkan peratusan degradasi benzena kepada 98% dalam masa 55 minit, sebaliknya penambahan Cu2+memberikan kesan negatif kepada aktiviti foto TiO2. Kajian juga memperoleh satu nilai optimum dengan aktiviti pemangkinan adalah tertinggi bagi kedua-dua ion Fe3+ dan Cu2+. Pengaruh panjang gelombang cahaya ke atas aktiviti foto TiO2 juga telah dikaji dengan menggunakan mangkin TiO2 dop Fe3+ dengan nisbah optimum. Hasil kajian menunjukkan bahawa degradasi gas benzena meningkat dengan pengurangan tenaga cahaya yang dipancarkan. Kata kunci: Pemangkinanfoto; pengoksidaanfoto; saput tipis; TiO2 The gas phase photooxidation of benzene was investigated using TiO2 thin film irradiated with UV light source. The thin film was prepared via TiO2 sol gel dip coating method. The same reaction was also carried out using TiO2 doped with Cu2+ and Fe3+ with 1:0.005, 1:0.001, 1:0.0005 and 1:0.0003 mole ratios. The results showed that 90% of benzene was degraded after 55 minutes UV (354 nm) irradiation of the TiO2 thin film. However the addition of Fe3+ ions with 1:0.0005 mole ratio degraded 98% of benzene within 55 minutes. In contrast, Cu2+ ions however give a detrimental effect to the photoactivity of TiO2. An optimum ratio of dopant, where TiO2 showed the highest activity, was determined for both Fe3+ and Cu2+. The effect of different wave-length light source was also carried out using TiO2 doped Fe3+ with optimum ratio. The degradation of benzene was found to increase with decreasing light energy. Key words: Photocatalysis; photooxidation; TiO2 thin film

scholarly journals TiO2 Microwave Synthesis, Electrophoretic Deposition of Thin Film, and Photocatalytic Properties for Methylene Blue and Methyl Red Dyes

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
A. K. Singh ◽  
Umesh T. Nakate
Keyword(s):  
Thin Film ◽  
Methylene Blue ◽  
Surface Area ◽  
Electrophoretic Deposition ◽  
Uv Light ◽  
Steel Substrate ◽  
Low Cost ◽  
Anatase Phase ◽  
Energy Dispersive Spectrometer ◽  
Methyl Red

Electrophoretic deposition (EPD) of TiO2 thin film was carried out at room temperature on low cost steel substrate using microwave synthesized nanoparticles (NPs) of TiO2. Synthesized NPs and EPD thin film were characterized at different stages of synthesis for its crystal structure, morphology, elemental analysis, and surface area. Spherical particle morphology and formation of TiO2 were confirmed by scanning electron micrograph (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). Synthesized NPs were formed in anatase phase having crystallite size of about 12.3 nm from Scherrer's formula using full width half maxima (FWHM). Surface area was found to be 43.52 m2/g by BET giving particle size of 33 nm. Photocatalytic (PC) behavior of TiO2 NPs and EPD TiO2 film on steel substrate was investigated under UV light for two commercial dyes and their photocatalysis efficiency was analyzed. NPs have shown better efficiency for methylene blue (MB) dye than EPD film whereas EPD film have shown higher PC activity for methyl red (MR) dye.

Ultraviolet Detector Based on TiO2 Thin Film

2013 ◽  
Vol 704 ◽  
pp. 195-199
Author(s):  
Qi Qi Ma ◽  
Biao He ◽  
Xiao Kun Huang ◽  
Yan Lan He ◽  
Xiao Yan Yu ◽  
...  
Keyword(s):  
Thin Film ◽  
Uv Light ◽  
Low Cost ◽  
Sol Gel ◽  
Metal Structure ◽  
Transfer Characteristic ◽  
Superior Performance ◽  
Electrical Measurements ◽  
Uv Detector ◽  
Uv Detectors

In this paper, TiO2 thin film with MSM (metal-semiconductor-metal) structure was used to fabricate ultraviolet (UV) detector. The film was fabricated via sol-gel method on silicon wafer with 300nm oxide layer and annealed at four different temperatures (400oC, 500oC, 600oC and 800oC). The quality of the thin films was characterized by means of X-ray diffraction and scanning electron microscope. Then a pair of symmetric Ag electrodes were deposited by thermal evaporation through a shade mask of interdigital structure. The photo-electric properties of the device including I-V characteristic, transfer characteristic and time response et.al. were studied with or without explored to 254nm UV light. The electrical measurements of the device show a big increase of current when explored the device to 254nm UV light, and the rise time of the device is very quick, but the fall time is relatively long. The detector with simple fabrication process, low cost, and superior performance would provide a potential application in UV detectors.

The Fabrication of Titanium Dioxide (TiO2) Thin Film via Deposited Spray Pyrolysis Using for Antibacterial Applications

2015 ◽  
Vol 804 ◽  
pp. 183-186
Author(s):  
Prapon Lertloypanyachai ◽  
Eakgapon Kaewnuam ◽  
Krittiya Sreebunpeng
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Titanium Dioxide ◽  
Spray Pyrolysis ◽  
Uv Light ◽  
Spray Pyrolysis Technique ◽  
Low Cost ◽  
Large Area ◽  
Bacteria Growth ◽  
Glass Substrates

Titanium dioxide (TiO2) is coated onto the materials (e.g.glass ceramic) to inhibit the bacteria growth. TiO2has become a popular photocatalyst for both air and water purification. It has also shown to be very active for bacterial destruction even under UV light. The photocatalytic of TiO2involves the light-induced catalysis of reducing and oxidizing reactions on the surface of materials. The spray pyrolysis technique for material synthesis in thin-film configuration is an interesting option due to the use of inexpensive precursor materials and low-cost equipment suitable for large-area coatings. In this research, TiO2thin films were deposited onto glass substrates using spray pyrolysis technique. Escherichia coli (E.coli) was used as testing bacteria. TiO2thin films showed some antibacterial effect in the halo test.

In situ growth of SnS absorbing layer by reactive sputtering for thin film solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 4108-4115 ◽  
Author(s):  
Lianbo Zhao ◽  
Yunxiang Di ◽  
Chang Yan ◽  
Fangyang Liu ◽  
Zhu Cheng ◽  
...  
Keyword(s):  
Thin Film ◽  
Single Phase ◽  
Low Cost ◽  
Thin Film Solar Cells ◽  
In Situ Growth ◽  
Promising Candidate ◽  
Earth Abundant ◽  
Absorbing Layer ◽  
Material Preparation

The semiconductor SnS is a promising candidate for low cost earth-abundant photovoltaic absorbing layers and presents some interesting challenges in single phase material preparation.

Photocatalytic Oxidation Removal of Gaseous Benzene over TiO2 /ACF Composite Photocatalyst Prepared by Screen-Printed Technology

2011 ◽  
Vol 197-198 ◽  
pp. 943-946
Author(s):  
Li Li Liu ◽  
Chang Yu Li
Keyword(s):  
Thin Film ◽  
Photocatalytic Oxidation ◽  
X Ray Diffraction ◽  
Composite Photocatalyst ◽  
X Ray ◽  
Phase Structures ◽  
Volatile Organic ◽  
Gaseous Benzene ◽  
Scanning Electron ◽  
Screen Printed

The TiO2 /ACF composite photocatalyst was prepared by using the screen printed technology. X-ray diffraction (XRD) and scanning electron microscopy ( SEM) were used to characterize the obtained composite. The results of XRD show the TiO2 /ACF composite photocatalyst is confirmed anatase as the only phase present and ACF has no effects on the phase structures of TiO2. The results of SEM show that TiO2 can form thin film on ACF surface. Benzene was chosen as the model of the volatile organic compounds (VOCs) to investigate the capability of TiO2/ACF composite photocatalyst. The results show the TiO2/ACF composite photocatalyst have higher activity for benzene removal than only TiO2 photocatalyst.

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