scholarly journals Preparation of ZnO-Zn2TiO4Sol Composite Films and Its Photocatalytic Activities

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Xiujuan Qin ◽  
Li Cui ◽  
Guangjie Shao
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Oxidation ◽  
Spectral Response ◽  
Sol Gel ◽  
Composite Films ◽  
Visible Region ◽  
Performance Testing ◽  
Structure Characterization ◽  
Semiconductor Oxides ◽  
Wide Range

Ti-doped ZnO sol-composite films were prepared on the glass substrate by the two-step sol-gel technique. X-ray diffraction, Uv-Vis spectrophotometer, and FS spectrum of composite films were used to help make structure characterization and optical performance testing. The results showed that the composite was a mixture of ZnO + Zn2TiO4. Because of synergistic effect of both semiconductor oxides, composite films had a wide range of spectral response in the visible region, and the absorption band edge was about 510 nm, and the Green Belt of composite films luminous significantly enhanced. Photocatalytic oxidation experiments showed that using the composite films treatment (16.5 ml, l0 mg/L methyl orange aqueous solution)/cm2, the decolorization rate of methyl-orange was 90% after 3 hours irradiation.

Study on the Influence Factors of ZnFe2O4 and TiO2 Composite Films Photoelectrocatalytic Properties

2011 ◽  
Vol 287-290 ◽  
pp. 2199-2202
Author(s):  
Gui Qin Hou ◽  
Wen Li Zhang ◽  
Shui Jing Gao ◽  
Xiao Yan Wang
Keyword(s):  
Methyl Orange ◽  
Sol Gel ◽  
Composite Films ◽  
Influence Factors ◽  
Nanocomposite Films ◽  
Gel Method ◽  
Sol Gel Method ◽  
Conductive Glass ◽  
Photocatalytic Activities ◽  
Film Layer

The ZnFe2O4 and TiO2 nanocomposite films was prepared by Sol-Gel method on conductive glass, and the influence factors of it’s photoelectrocatalytic performence such as the film layer, pole and voltage was investigated. The results indicated that: the photocatalytic effects of composite films with ZnFe2O4+ TiO2+ ZnFe2O4 was the best. The decomposing ratio of methyl orange with the photoelectrocatalysis of composite films at voltage 0.2-6V all increased unstably.At the same time, the distance from films to pole plank also had the effects on the photocatalytic activities of the films.

Photocatalytic Reduction of Methyl Orange Using Titania Photocatalyst Codoped with Nitrogen and Gadolinium under Visible Light Illumination

2009 ◽  
Vol 79-82 ◽  
pp. 2127-2130 ◽  
Author(s):  
Song Tao Gu ◽  
Xin Wang ◽  
Qiang Liu ◽  
Hao Quan Liu ◽  
Gui Jun Jiang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Synergistic Effects ◽  
Sol Gel ◽  
Visible Region ◽  
Light Illumination ◽  
Active Nitrogen ◽  
Doped Tio2 ◽  
Codoped Tio2

A visible-light-active nitrogen and gadolinium codoped TiO2 catalyst was synthesized by the sol-gel route. For comparison, Gd-doped sample, N-doped sample, and pure titania were prepared through the same method, without adding the corresponding dopants. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD) and Uv-vis spectra. The results showed that the codoped photocatalyst exhibited a smaller size than the undoped titania. The transformation from anatase to rutile was suppressed by doping with N and Gd atoms. Furthermore, the absorbance spectra of N, Gd-codoped TiO2 exhibited a significant red shift to the visible region. The photocatalytic activity of N, Gd-codoped TiO2 was evaluated by photodegradation of methyl orange under visible light irradiation. This codoped sample exhibited enhanced photocatalytic activity compared to N-doped TiO2, Gd-doped TiO2, and pure TiO2. The improvement of the photocatalytic activity was ascribed to the synergistic effects of the N and Gd co-doping.

Novel thin films of titanium dioxide particles synthesized by a sol-gel process

1995 ◽  
Vol 10 (12) ◽  
pp. 3068-3078 ◽  
Author(s):  
V.J. Nagpal ◽  
R.M. Davis ◽  
S.B. Desu
Keyword(s):  
Thin Films ◽  
Titanium Dioxide ◽  
Sol Gel ◽  
Particle Surface ◽  
Composite Films ◽  
Visible Region ◽  
Silicon Substrates ◽  
Transparent Films ◽  
Sol Gel Process ◽  
Crystalline Films

Novel thin films of ultrafine titanium dioxide particles dispersed in a matrix of hydroxypropylcellulose (HPC) polymer have been made on quartz and silicon substrates. The titanium dioxide particles were made by the hydrolysis and condensation of titanium tetraethoxide (TEOT) in solutions of HPC in a mixture of ethanol and water. HPC controlled the particle size by adsorbing at the particle surface during the growth process and generating repulsive steric forces. The TiO2/HPC composite films were transparent in the visible region and completely blocked ultraviolet radiation at 300 nm. These films were crack-free and uniform in composition and thickness. Transparent films of amorphous TiO2 were made by burning out the HPC at 500 °C. These films were highly uniform and had no macroscopic cracks. X-ray diffraction revealed a transition to the anatase form upon sintering at 600 °C. A film sintered at 700 °C had a porosity of 38%. The crystalline films remained transparent until they densified at 800 °C.

scholarly journals Effect of Ce Doping on RGO-TiO2Nanocomposite for High Photoelectrocatalytic Behavior

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Md. Rakibul Hasan ◽  
Chin Wei Lai ◽  
Sharifah Bee Abd Hamid ◽  
Wan Jeffrey Basirun
Keyword(s):  
Composite Film ◽  
Sol Gel ◽  
Composite Films ◽  
Visible Region ◽  
Rutile Phase ◽  
Nanocomposite Films ◽  
Tetrabutyl Titanate ◽  
Photoelectrochemical Performance ◽  
Solar Simulator ◽  
Fourier Transformed Infrared Spectroscopy

Ce doped RGO-TiO2composite films on ITO substrates were prepared by sol-gel process using tetrabutyl titanate and reduced graphene oxide (RGO) as the starting materials. The sample was designed for the photoelectrocatalytic applications. The obtained samples were characterized by X-ray diffraction, UV-vis absorption spectroscopy, scanning electron microscopy, and Fourier transformed infrared spectroscopy. The results showed that doping of Ce on RGO-TiO2composite film inhibited the TiO2anatase-rutile phase transformation. In this case, Ce atoms could serve as dispersion oxide and suppress the recombination of photoinduced electron-hole pairs. Besides, the change in absorbance from UV to visible region was observed in Ce doped RGO-TiO2nanocomposite films. The Ce doped RGO-TiO2composite film showed higher photoelectrochemical performance than that of RGO-TiO2composite and pure TiO2under solar simulator irradiation. The main reason might be attributed to the optimum content of Ce that could act as electrons acceptor to hinder the recombination loss and facilitate the better transportation for photoinduced charge carriers.

Enhanced Photocatalytic Activity of N/Li2MoO4 Co-doped TiO2 Nanoparticles under Visible Light

2021 ◽  
Author(s):  
Jutarat Kwakkaew ◽  
Matthana Khangkhamano ◽  
Rungrote Kokoo ◽  
Weerachai Sangchay
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Tio2 Nanoparticles ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Visible Region ◽  
Strong Light ◽  
Doped Tio2 ◽  
Vis Spectroscopy ◽  
Wide Range

TiO2-based nanomaterials have been extensively synthesized and used in a wide range of photocatalytic applications. The photocatalytic oxidation process, however, is only activated by irradiation with ultraviolet (UV) light which limits its indoor applications. Herein, to improve such limitations, N/Li2MoO4-doped TiO2 nanoparticles were prepared via sol-gel method. Li2MoO4 concentration was varied. The catalysts were characterized by XRD, XPS, FE-SEM, and UV-Vis spectroscopy. As-synthesized N/Li2MoO4-doped TiO2 catalysts exhibited their crystal sizes of as fine as 20 nm in diameter whereas that of the pure TiO2 was about 35 nm. The absorption ranges of the N/ Li2MoO4-doped catalysts were relocated from UV region toward visible light region. The catalyst with 1 mol% Li2MoO4 offered the highest degradation rate of methylene blue (MB) solution upon visible light irradiation. Its fine crystal size, narrow band gap energy (2.82 eV), high defect concentration, and strong light absorption in visible region are responsible for the enhanced photocatalytic activity of the 1 mol% Li2MoO4.

Effect of TiO2 Nanoparticles on Tensile and Photodegradation Behavior of Biopolymer Films Based on Poly(Butylene Succinate)

2013 ◽  
Vol 376 ◽  
pp. 89-92 ◽  
Author(s):  
Achanai Buasri ◽  
Nattawut Chaiyut ◽  
Vorrada Loryuenyong ◽  
Metta Worachat ◽  
Rapeepan Kanchanapradit ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Titanium Dioxide Nanoparticles ◽  
Composite Films ◽  
Tensile Modulus ◽  
Nanocomposite Films ◽  
Butylene Succinate ◽  
Uniform Dispersion ◽  
Wide Range ◽  
The Matrix ◽  
Evaporation Technique

Tensile and photodegradation behavior of poly (butylene succinate)/titanium dioxide nanoparticles (PBS/TiO2) composite films were investigated over a range of filler content 0-10 wt%. The surface of TiO2 nanoparticles was treated using propionic acid (C3H6O2) and n-hexylamine (C6H15N) order to disperse them into the bipolymer matrices. The nanocomposite materials were prepared by solvent evaporation technique and compression molding machine. All samples with a wide range of filler addition exhibit the translucency. The surface morphology showed that a uniform dispersion of filler in the matrix existed when the nanoparticles content was less than 5 wt%. The results indicated that the percentage of weight loss of the nanocomposite films was higher than the neat PBS owing to UVA and UVC irradiation. Functionalized TiO2 nanoparticles existing on the surface area suppressed photodegradation of the inner and backside of film specimens. The biopolymer films can easily be degraded by photocatalytic oxidation of TiO2 under UV irradiation. The introduction of modified TiO2 into PBS matrix improved the tensile modulus of the nanocomposites.

scholarly journals Silver DopedTiO2Nanostructure Composite Photocatalyst Film Synthesized by Sol-Gel Spin and Dip Coating Technique on Glass

2008 ◽  
Vol 2008 ◽  
pp. 1-11 ◽  
Author(s):  
Mojtaba Nasr-Esfahani ◽  
Mohammad Hossein Habibi
Keyword(s):  
Methyl Orange ◽  
Anatase Phase ◽  
Sol Gel ◽  
Composite Films ◽  
Methyl Cellulose ◽  
Dip Coating ◽  
Silver Addition ◽  
Coating Technique ◽  
Xrd Diffraction ◽  
Dip Coating Technique

New composite films (P25SGF-MC-Ag, MPC500SGF-MC-Ag, and ANPSGF-MC-Ag) have been synthesized by a modified sol-gel method using different particle sizes ofTiO2powder and silver addition. NanostructureTiO2/Ag composite thin films were prepared by a sol-gel spin and dip coating technique. while, by introducing methyl cellulose (MC) porous,TiO2/Ag films were obtained after calcining at a temperature of 500°C. The as-preparedTiO2andTiO2/Ag films were characterized by X-ray diffractometry, and scanning electron microscopy to reveal the structural and morphological differences. In addition, the photocatalytic properties of these films were investigated by degrading methyl orange (MO) under UV irradiation. After 500°C calcination, the microstructure of MC-TiO2film without Ag addition exhibited a microstructure, while significant sintering effect was noticed with Ag additions and the films exhibited a porous microstructure. Nanostructure anatase-phaseTiO2can be observed with respect to the sharpening of XRD diffraction peaks. The photodegradation of porousTiO2deposited with5×10−4 mol Ag exhibited the best photocatalytic efficiency, where 69% methyl orange can be decomposed after UV exposure for 1 hour.

Design of outstanding random-patterns surface for enhancement of light scattering in Perovskite solar cell

2016 ◽  
Vol 09 (06) ◽  
pp. 1642011 ◽  
Author(s):  
Dong In Kim ◽  
Sang-Hun Nam ◽  
Ki-Hwan Hwang ◽  
Yong-Min Lee ◽  
Jin-Hyo Boo
Keyword(s):  
Solar Cell ◽  
Light Scattering ◽  
Spectral Response ◽  
Short Circuit ◽  
Visible Region ◽  
Perovskite Solar Cell ◽  
Etching Time ◽  
Random Structure ◽  
Wide Range ◽  
Random Patterns

Glass texturing is an efficient method for changing the surface morphology to enhance the solar cell spectral response. In this study, we present a method for optimizing the light scattering (LS) properties of uneven surface with random-patterns for perovskite solar cell (PSC) applications. Glass substrates were textured with a random structure assisted wet etching process using diluted hydrofluoric acid solution at a constant concentration of etchants. Then, the light trapping (LT) properties of suitable films were controlled over a wide range by varying the etching time (1–5[Formula: see text]min.). The optical properties of the surface and the reflection efficiency of the rugged surface should be maximized in the visible region at 5[Formula: see text]min. As a result in terms of short-circuit current density (Jsc), a gain of 23.0[Formula: see text]mA/cm2 (more than 29.9%) and power conversion efficiency (PCE) of 12.3% (more than 31.7%) are achieved with the introduction of textured interface.

Visible-Light Activity Evaluation of p-n Junction Photocatalyst NiO/TiO2 Prepared by Sol-Gel Method

2010 ◽  
Vol 152-153 ◽  
pp. 441-449 ◽  
Author(s):  
Wei Liu ◽  
Shi Fu Chen
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Oxidation ◽  
Raw Materials ◽  
Sol Gel ◽  
Visible Region ◽  
Tetrabutyl Titanate ◽  
Gel Method ◽  
Sol Gel Method ◽  
Light Activity

P-N junction photocatalyst NiO/TiO2 photoexcited by visible light was prepared by sol-gel method using Ni(NO3)2•6H2O and tetrabutyl titanate [Ti(OC4H9)4] as the raw materials. The p-n junction photocatalyst NiO/TiO2 was characterized by UV-Vis diffuse reflection spectrum, fluorescence spectra (FL), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). UV-Vis spectrum showed that the absorption wavelength range of NiO/TiO2 is extended to the visible region, making it an effective photocatalyst photoexcited by visible light. This was demonstrated by photocatalytic reduction of Cr2O72- and photocatalytic oxidation of methyl orange (MO) under visible-light (λ>400 nm) irradiation. Doped-NiO effectively suppressed the phase transformation of anatase to rutile and the growth of titania crystallites. The optimum percentage of doped NiO is 0.5% (mole ratio of Ni/Ti). Effects of heat treatment on the photocatalytic activity of p-n junction photocatalyst NiO/TiO2 were investigated. The mechanisms of influence on the photocatalytic activity were also discussed by the p-n junction principle.

PREPARATION AND STRUCTURAL CHARACTERIZATION OF BINARY CATALYST FOR DYE WASTEWATER

2017 ◽  
Vol 79 (1-2) ◽  
Author(s):  
Zanariah Rajis ◽  
Mohammad Noorul Anam Mohd Norddin ◽  
Azeman Mustafa ◽  
Ahmad Fauzi Ismail
Keyword(s):  
Band Gap ◽  
Photocatalytic Oxidation ◽  
Sol Gel ◽  
Visible Region ◽  
Wide Band ◽  
Xrd Analysis ◽  
Synthetic Dyes ◽  
Dye Wastewater ◽  
Wide Band Gap ◽  
Binary Catalyst

Synthetic dyes used in most industries have persistence chemical compounds which cannot be degraded by conventional method. To overcome this problem, researchers utilize photocatalytic oxidation and TiO2 has become favourite photocatalyst. However, TiO2 has wide band gap and needs modification. One of the modifications is binary catalyst which found to be more effective as it commonly binds another photocatalyst that is readily exist in visible region to TiO2. Over the past 5 years Ag2O has been a chosen catalyst due to its low band gap. However, Ag2O often experiences self-aggregation. Thus, the optimum doping ratio of TiO2/Ag2O was determine by physical blend of TiO2 and Ag2O into 2 ratios, which were 1% Ag2O and 5% Ag2O. TiO2 was synthesized using sol gel method and Ag2O was synthesized using co-percipitation method. Both catalysts were blended physically and characterized using FESEM-EDX and XRD analysis. EDX mapping analysis showed TiO2/ Ag2O -5% exhibit better distribution of Ag2O. In addition, XRD analysis shows TiO2/ Ag2O -5% has more intense Ag2O peaks compare to TiO2/ Ag2O -1%. Based on the characterization results, TiO2/ Ag2O-5% showed promising ratio loading for dye wastewater photocatalytic degradation. 

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