The bismuth oxyhalide family: thin film synthesis and periodic properties

2018 ◽  
Vol 47 (35) ◽  
pp. 12459-12467 ◽  
Author(s):  
Laura S. Gómez-Velázquez ◽  
Agileo Hernández-Gordillo ◽  
Matthew J. Robinson ◽  
Valerie J. Leppert ◽  
Sandra E. Rodil ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Activity ◽  
Simulated Sunlight ◽  
Bismuth Oxyhalides ◽  
Bismuth Oxyhalide ◽  
Film Synthesis

The complete bismuth oxyhalides were synthesized as thin films. β-Bi2O3 films were transformed into BiOX for X = F, Cl and Br by chemical baths; BiOI was obtained by spraying the solution directly. All BiOX films present photocatalytic activity under simulated sunlight.

scholarly journals Optical and Electrical Properties of Thin Films of CuS Nanodisks Ensembles Annealed in a Vacuum and Their Photocatalytic Activity

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
J. Santos Cruz ◽  
S. A. Mayén Hernández ◽  
F. Paraguay Delgado ◽  
O. Zelaya Angel ◽  
R. Castanedo Pérez ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Hydrogen Peroxide ◽  
Photocatalytic Activity ◽  
Electrical Properties ◽  
Absolute Temperature ◽  
Glass Substrates ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Blue Solution

Effects on the optical, electrical, and photocatalytic properties of undoped CuS thin films nanodisks vacuum annealed at different temperatures were investigated. The chemical bath prepared CuS thin films were obtained at 40°C on glass substrates. The grain size of13.5±3.5 nm was computed directly from high-resolution transmission electron microscopy (HRTEM) images. The electrical properties were measured by means of both Hall effect at room temperature and dark resistivity as a function of the absolute temperature 100–330 K. The activation energy values were calculated as 0.007, 0.013, and 0.013 eV for 100, 150, and 200°C, respectively. The energy band gap of the films varied in the range of 1.98 up to 2.34 eV. The photocatalytic activity of the CuS thin film was evaluated by employing the degradation of aqueous methylene blue solution in the presence of hydrogen peroxide. The CuS sample thin film annealed in vacuum at 150°C exhibited the highest photocatalytic activity in presence of hydrogen peroxide.

Photocatalytic Activities of Ce3+-Doped TiO2 Thin Films Prepared by Sol-Gel Method

2011 ◽  
Vol 239-242 ◽  
pp. 1850-1853
Author(s):  
Shu Kai Zheng
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Atomic Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Annealing Temperatures ◽  
Glass Slides ◽  
Photocatalytic Activities

A series of TiO2 thin films with and without Ce3+ doping were successfully obtained on microscope glass slides by sol-gel method. The photocatalytic activities of the pure TiO2 and Ce3+-doped TiO2 thin films were evaluated by the degradation of rhodamine B solution. The effects of both Ce3+ contents and annealing temperatures on the photocatalytic activities of the samples were examined. The results indicated that the TiO2 thin film with an atomic ratio of Ti:Ce=5:1 annealed at 300°C had a higher photocatalytic activity among the samples.

Electrodeposition of lithium phthalocyanine thin films: Part I. Structure and morphology

1999 ◽  
Vol 14 (5) ◽  
pp. 2162-2172 ◽  
Author(s):  
M. Brinkmann ◽  
S. Graff ◽  
C. Chaumont ◽  
J-J. André
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Indium Tin Oxide ◽  
Film Growth ◽  
Oxidation Potential ◽  
Thin Film Growth ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
X Ray ◽  
Film Synthesis

A new thin film synthesis route based on the electrochemical oxidation of PcLi2 and deposition of lithium phthalocyanine (PcLi) onto indium tin oxide (ITO) substrate is demonstrated. The effects on the thin film morphology of various parameters such as the electrolysis time, the nature of the solvent, and the oxidation potential are investigated. The thin film growth is studied via x-ray diffraction, potential step experiments, and ex situ scanning electron microscopy. Various morphologies of the x-form thin films are observed for different electrolysis times and solvents. Thin films grown in acetonitrile of thickness above 1 μm consist in unidirectionally oriented needle-shaped crystallites.

Photocatalytic Degradation of Methyl Orange: Influence of H2O2 in the TiO2-Based System

2008 ◽  
Vol 8 (2) ◽  
pp. 728-732 ◽  
Author(s):  
Luminita Andronic ◽  
Simona Manolache ◽  
Anca Duta
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Oxidation ◽  
Internal Surface ◽  
Doctor Blade ◽  
Spray Pyrolysis Deposition ◽  
Methyl Orange Concentration ◽  
Degradation Of Methyl Orange

The purpose of this study was to investigate the photocatalytic oxidation of a reactive azo dye. The photocatalytic activity of the TiO2 was studied using a reactor equipped with UV-A sources, with maximum emission at 365 nm. The photocatalytic activity of the TiO2 powder (99.9% anatase) and thin films has been measured through the decomposition of methyl orange solutions. The thin film was prepared by doctor blade and spray pyrolysis deposition (SPD). The TiO2 suspensions were prepared at 1 g/L concentration, and the initial methyl orange concentration was fixed at 7.8125 mg/L. The influence of the TiO2 (powder or thin films) and/or O2 and H2O2 on the photobleaching rate, was tested under different experiments, at pH = 5. Thin films (doctor blade) of TiO2 formed of mezo-sized aggregates formed of nanosized anatase crystallites show better photobleaching efficiency than thin film(SPD) due to their large internal surface. The rate is even higher in H2O2 compared to oxygen environment.

Photocatalytic Activity of Bilayer TiO2/ZnO and ZnO TiO2 Thin Films

2020 ◽  
Vol 1010 ◽  
pp. 411-417
Author(s):  
Rosniza Hussin ◽  
Nur Syahraain Zulkiflee ◽  
Zakiah Kamdi ◽  
Ainun Rahmahwati Ainuddin ◽  
Zawati Harun ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Activity ◽  
Reaction Rate ◽  
Electronic Devices ◽  
Xrd Analysis ◽  
Optical Coatings ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Crystal

Thin film is a thin material that is resulting from the condensation of species through the deposition of atoms on the substrate. Thin films are usually used in the production of electronic devices, optical coatings, solar cells, and for decorative items. The bilayer of TiO2/ZnO and ZnO TiO2 thin films have some advantages such as can enhance the surface state and surface atomic mobility, which are useful for improving the photocatalytic activity. The motivation to a used double layer of ZnO and TiO2 is to enhance the properties and photocatalytic activity using the different deposition temperature between the layers. The structural of ZnO/TiO2 thin films were studied using X-Ray diffraction (XRD). Field Emission Scanning Electron Microscope (FESEM) was used to determine the surface morphology of ZnO/TiO2 thin films. The photocatalytic activity of ZnO/TiO2 thin films was analysed using the photodegradation of methylene blue (MB) solution. The XRD analysis revealed that highest anatase crystalline phase for TiO2 growth with orientation (1 0 1), while the ZnO crystal phase, zincite occurred at the highest intensity with (1 0 1) orientation.. The bilayer TiO2/ZnO thin film had the highest reaction rate, K, which is 0.0972 h-1 for photocatalytic activity. The characteristics of bilayer TiO2/ZnO and ZnO/TiO2 thin-film is strongly influenced by the calcination temperature and the presence and combination between the two types of materials.

scholarly journals Photocatalytic Activity under Simulated Sunlight of Bi-Modified TiO2 Thin Films Obtained by Sol Gel

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
D. A. Solís-Casados ◽  
L. Escobar-Alarcón ◽  
V. Alvarado-Pérez ◽  
E. Haro-Poniatowski
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Anatase Phase ◽  
Sol Gel ◽  
Optical Measurements ◽  
Simulated Sunlight ◽  
Tio2 Thin Films ◽  
X Ray

The synthesis of Bi-modified TiO2 thin films, with different Bi contents, is reported. The obtained materials were characterized by energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy (RS), X-ray diffraction (XRD), photoluminescence (PL), and diffuse reflectance spectroscopy (DRS), in order to obtain information on their chemical composition, vibrational features, and optical properties, respectively. Compositional characterization reveals that the bismuth content can be varied in an easy way from 0.5 to 25.4 at. %. Raman results show that the starting material corresponds to the anatase phase of crystalline TiO2, and Bi addition promotes the formation of bismuth titanates, Bi2Ti2O7 at Bi contents of 10.4 at. % and the Bi4Ti3O12 at Bi contents of 21.5 and 25.4 at. %. Optical measurements reveal that the band gap narrows from 3.3 eV to values as low as 2.7 eV. The photocatalytic activity was tested in the degradation reaction of the Malachite Green carbinol base dye (MG) as a model molecule under simulated sunlight, where the most relevant result is that photocatalytic formulations containing bismuth showed higher catalytic activity than pure TiO2. The higher photocatalytic activity of MG degradation of 67% reached by the photocatalytic formulation of 21.5 at. % of bismuth is attributed to the presence of the crystalline phase perovskite-type bismuth titanate, Bi4Ti3O12.

Thin-Film Synthesis and Cyclic Oxidation Behavior of B2-RuAl

2008 ◽  
Vol 1128 ◽  
Author(s):  
Karsten Woll ◽  
Rama Chinnam ◽  
Frank Mücklich
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Reaction Mechanism ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Single Phase ◽  
Oxidation Behaviour ◽  
Compressive Stresses ◽  
Phase Sequence ◽  
Film Synthesis

AbstractB2-RuAl as a potential intermetallic for thin-film applications at high temperatures is studied with respect to thin-film synthesis and cyclic oxidation behaviour. Using the multilayer approach, single phase RuAl thin films were fabricated. The phase sequence from the elements Ru and Al goes through RuAl6 to the final product RuAl. To understand the reaction mechanism calorimetric as well as kinetic experiments were performed. The cyclic oxidation behavior is characterized at 1200 °C up to 47 h. The morphology of the grown alumina shows no cracks or regions of spallation which indicates the good cyclic oxidation behavior. Compressive stresses in the oxidation scale of about 1.2 GPa at maximum were determined.

scholarly journals Polyoxoniobates as molecular building blocks in thin films

2021 ◽  
Author(s):  
Mark A. Rambaran ◽  
András Gorzsás ◽  
Michael Holmboe ◽  
C. André Ohlin
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Niobium Oxide ◽  
Building Blocks ◽  
Oxide Thin Film ◽  
Molecular Building Blocks ◽  
Film Synthesis

Crystallinity, thickness, and roughness can be controlled using polyoxoniobates as molecular building blocks in niobium oxide thin film synthesis.

scholarly journals The Role of Concentration Ratio of TTiP:AcAc on the Photocatalytic Activity of TiO2 Thin Film in Reducing Degradation Products of Used Frying Oil

2017 ◽  
Vol 12 (3) ◽  
pp. 430 ◽  
Author(s):  
Ummi Kaltsum ◽  
Affandi Faisal Kurniawan ◽  
Iis Nurhasanah ◽  
Priyono Priyono
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Activity ◽  
Concentration Ratio ◽  
Tio2 Thin Film ◽  
Degradation Products ◽  
Precursor Solution ◽  
Frying Oil ◽  
Tio2 Thin Films ◽  
Used Frying Oil

The TiO2 thin film has been applied to reduce degradation products (free fatty acid/FFA and peroxide value/PV) in used frying oil under ultraviolet (UV) light irradiation. FFA and PV are degradation products in used frying oil that can cause various diseases in human. In this study, the TiO2 thin films were made from precursor solution with concentration ratio of titanium tetraisopropoxide (TTiP) and acetylacetone (AcAc) of 1:1, 1:2, 2:1, 2:3, and 3:2. The aim of this study is to investigate the effect of concentration ratio of TTiP and AcAc on the photocatalytic activity of TiO2 thin film in reducing FFA and PV of used frying oil. The spray coating method was used to deposit precursor solution of TiO2 onto glass substrate at 450 oC. All TiO2 thin films consist of spherical-like grain with dominant structure of TiO2 rutile. The band gap energy of TiO2 thin films was in the range 3.11-3.16 eV. Concentration ratio of TTiP and AcAc of 2:3 results in TiO2 thin film with highest photocatalytic activity in reducing FFA and PV of used frying oil. Copyright © 2017 BCREC Group. All rights reservedReceived: 20th February 2017; Revised: 27th May 2017; Accepted: 30st May 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Kaltsum, U., Kurniawan, A.F., Nurhasanah, I., Priyono, P. (2017). The Role of Concentration Ratio of TTiP:AcAc on the Photocatalytic Activity of TiO2 Thin Film in Reducing Degradation Products of Used Frying Oil. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 430-436 (doi:10.9767/bcrec.12.3.951.430-436) 

scholarly journals Reduction of Peroxide Value and Free Fatty Acid Value of Used Frying Oil Using TiO2 Thin Film Photocatalyst

2016 ◽  
Vol 11 (3) ◽  
pp. 369
Author(s):  
Ummi Kaltsum ◽  
Affandi Faisal Kurniawan ◽  
Iis Nurhasanah ◽  
Priyono Priyono
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Photocatalytic Activity ◽  
Fatty Acid ◽  
Free Fatty Acid ◽  
Peroxide Value ◽  
Acid Value ◽  
Frying Oil ◽  
Photocatalytic Process ◽  
Used Frying Oil

<p>The quality of used frying oil degraded due to the presence of products degradation, such as; PV and FFA which formed during the frying process. PV and FFA are harmful to human health. The photocatalytic activity of TiO<sub>2</sub> thin film has been applied in various fields, especially in the environment. The aim of this study is to evaluate photocatalytic activity of TiO<sub>2</sub> thin film for reducing PV and FFA in used frying oil. The TiO<sub>2</sub> thin films were deposited on glass substrate by spray coating method at a temperature of 450 <sup>o</sup>C. The TiO<sub>2</sub> precursor solution was prepared by mixing TTiP, AcAc, and ethanol. The thin films were varied into two conditions; as-deposited and annealed at a temperature of 500 <sup>o</sup>C. The morphology, crystalline structure, and optical properties of the thin films were characterized <span style="language: id; mso-ansi-language: id; mso-fareast-language: ko;" lang="id">by scanning electron microscope (SEM), X-ray </span> Diffraction (XRD), and UV-VIS spectrophotometer, respectively. The photocatalytic process was carried out by putting TiO<sub>2</sub> thin film in used frying oil and irradiated by sunlight. The result showed that both of TiO<sub>2</sub> thin films were still amorphous in nature. However, there was a peak with low intensity for annealed TiO<sub>2</sub> thin film which corresponding to the TiO<sub>2 </sub>anatase crystals plane of (101). Annealing process improved crystallinity and changed the shape morphology of TiO<sub>2</sub> thin films. The band gap was found to be 3.59 eV for as-deposited TiO<sub>2</sub> thin film and 3.49 eV for the annealed-TiO<sub>2</sub> thin film. The photocatalytic process shows that TiO<sub>2</sub> thin films reduced FFA and PV of used frying oil up to 67.10% and 79.15%, respectively. Photocatalytic activity of annealed TiO<sub>2</sub> thin film was higher than as-deposited TiO<sub>2</sub> thin film. The results indicated that TiO<sub>2</sub> thin film photocatalyst potential as the new alternative method to purify used frying oil. Copyright © 2016 BCREC GROUP. All rights reserved</p><p><em>Received: 23<sup>rd</sup> January 2016; Revised: 17<sup>th</sup> April 2016; Accepted: 7<sup>th</sup> June 2016</em></p><p><strong>How to Cite:</strong> Kaltsum, U., Kurniawan, A.F., Nurhasanah, I., Priyono, P. (2016). Reduction of Peroxide Value and Free Fatty Acid Value of Used Frying Oil Using TiO<sub>2</sub> Thin Film Photocatalyst. <em>Bulletin of Chemical Reaction Engineering &amp; Catalysis</em>, 11 (3): 369-375 (doi:10.9767/bcrec.11.3.577.369-375)</p><p><strong>Permalink/DOI:</strong> <a href="http://doi.org/10.9767/bcrec.11.3.577.369-375">http://doi.org/10.9767/bcrec.11.3.577.369-375</a></p>

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