Energy Storage of NiO/TiO2 Bilayer Films and its Effectiveness in the Degradation of Acid Orange 7

2012 ◽  
Vol 557-559 ◽  
pp. 2002-2007 ◽  
Author(s):  
Suphamongkol Buama ◽  
Pailin Ngaotrakanwiwat ◽  
Pramoch Rangsunvigit
Keyword(s):  
Energy Storage ◽  
Batch Reactor ◽  
Bilayer Film ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Bilayer Films ◽  
Uv Illumination ◽  
Coating Method ◽  
Different Temperatures ◽  
First Time

The concept of storing energy in TiO2when it was illuminated with light and using the catalyst when there was no light was tested for the first time. Ni(OH)2was incorporated into TiO2for the energy storage purpose. Ni(OH)2was subjected to three different temperatures (300 – 500°C) before the incorporation. NiO/TiO2bilayer films were prepared with spin-coating method. The films were tested for its electrochemical and photoelectrochemical properties in 1 M NaOH. The NiO/TiO2 film prepared with Ni(OH)2calcined at 300°C showed energy storage potential. The catalysts were then investigated for their catalytic activity in the photocatalytic degradation of acid orange 7 (AO7). The experiments were carried out in a batch reactor containing 500 ml of 20 ppm AO7 and 0.2 g NiO/TiO2bilayer film. The reaction were carried out under UV illumination for 2 h before continuing without the illumination (dark condition) for another 2 h. NiO/TiO2showed photcatalytic properties even without illumination implying that the energy stored during the illumination drove the photocatalytic reaction.

Granular activated carbon-biofilm configured sequencing batch reactor treatment of C.I. Acid Orange 7

2008 ◽  
Vol 76 (1) ◽  
pp. 142-146 ◽  
Author(s):  
Soon-An Ong ◽  
Eiichi Toorisaka ◽  
Makoto Hirata ◽  
Tadashi Hano
Keyword(s):  
Activated Carbon ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Granular Activated Carbon ◽  
Acid Orange 7 ◽  
Acid Orange

scholarly journals Degradation of Acid Orange 7 Azo Dye in Aqueous Solution by a Catalytic-Assisted, Non-Thermal Plasma Process

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 888 ◽  
Author(s):  
Giuseppina Iervolino ◽  
Vincenzo Vaiano ◽  
Giacomo Pepe ◽  
Pietro Campiglia ◽  
Vincenzo Palma
Keyword(s):  
Azo Dye ◽  
Dip Coating ◽  
Acid Orange 7 ◽  
Acid Orange ◽  
Structured Catalyst ◽  
Glass Spheres ◽  
Coating Method ◽  
Non Thermal Plasma ◽  
Dip Coating Method ◽  
By Products

The aim of this work was the optimization of the performance of the cold plasma technology coupled with a structured catalyst for the discoloration and mineralization of “acid orange 7” (AO7) azo dye. The structured catalyst consists of Fe2O3 immobilized on glass spheres, and it was prepared by the “dip coating” method and characterized by different chemico-physical techniques. The experiments were carried out in a dielectric barrier discharge (DBD) reactor. Thanks to the presence of the catalytic packed material, the complete discoloration and mineralization of the dye was achieved with voltage equal to 12 kV, lower than those generally used with this technology (approximately 20–40 kV). The best result in terms of discoloration and mineralization (80% after only 5 min both for discoloration and mineralization) was obtained with 0.25 wt% of Fe2O3 immobilized on the glass spheres, without formation of reaction by-products, as shown by the HPLC analysis. The optimized catalyst was reused for several reuse cycles without any substantial decrease of performances. Moreover, tests with radical scavengers evidenced that the most responsible oxidizing species for the degradation of AO7 dye was O2•−.

Sequential Operation of Three Distinct Misfit Dislocation Introduction Mechanisms in an Epitaxial Bilayer Film

1999 ◽  
Vol 594 ◽  
Author(s):  
V. Gopal ◽  
E. P. Kvam ◽  
E.-H. Chen ◽  
J. M. Woodall
Keyword(s):  
Stress Relaxation ◽  
Misfit Dislocation ◽  
Bilayer Film ◽  
Threading Dislocations ◽  
Misfit Dislocations ◽  
Stages Of Growth ◽  
Bilayer Films ◽  
Mismatch Stress ◽  
Edge Dislocations ◽  
First Time

AbstractMismatch stress relaxation mechanisms in bilayer films of (In, Al)As on InAs on GaP have been examined. Initial edge (90°) misfit dislocations at the InAs/GaP interface appear to be introduced directly at island edges during initial stages of growth. The incomplete mismatch compensation is taken up by later introduction of glissile (60°) dislocations, usually in pairs which combine to form edge dislocations. The edge dislocations in the interface then move laterally to equalize their spacings. The upper (In, Al)As capping layer, which is tensile strained to match the relaxed InAs, exhibits a different mechanism of misfit dislocation introduction. Threading dislocations move by climb, directly introducing sessile edge dislocations at the buried interface. It is believed this is the first time that this mechanism has been observed.

Degradation of acid orange 7 by a controlled anaerobic–aerobic sequencing batch reactor

2006 ◽  
Vol 54 (2) ◽  
pp. 187-192 ◽  
Author(s):  
G. Buitrón ◽  
K.M. Martínez ◽  
A. Vargas
Keyword(s):  
Organic Carbon ◽  
Azo Dye ◽  
Inflection Point ◽  
Sequencing Batch Reactor ◽  
Model Compound ◽  
Batch Reactor ◽  
Control Variable ◽  
Synthetic Wastewater ◽  
Acid Orange 7 ◽  
Acid Orange

The degradation of a mono azo dye in an automated and controlled anaerobic–aerobic sequencing batch reactor (SBR) is described in this work. The experiments were conducted with a synthetic wastewater containing acid orange 7 as the model compound to degrade and glucose as the co-substrate in a molar relationship 1:40 (substrate/co-substrate). It was possible to control the anaerobic and aerobic stages, using the redox potential (ORP) as the only control variable. The strategy detects an inflection point in the ORP signal, indicating the end of the reaction. The efficiency of removal of total organic carbon was between 85% and 90%. Azo dye was removed with 85% efficiency during the anaerobic stage.

Revisiting Glycerol Esterification with Acetic Acid over Amberlyst-35 via Statistically Designed Experiments: Overcoming Transport Limitations

2019 ◽  
Author(s):  
Víctor Gabriel Baldovino Medrano ◽  
Karen V. Caballero ◽  
Hernando Guerrero-Amaya
Keyword(s):  
Acetic Acid ◽  
Active Sites ◽  
Batch Reactor ◽  
Catalyst Particle ◽  
Experimental Designs ◽  
Particle Sizes ◽  
Turnover Rates ◽  
Designed Experiments ◽  
Different Temperatures ◽  
Glycerol Esterification

Turnover rates for glycerol esterification with acetic acid over Amberlyst-35 were measured under different temperatures, reactants and active sites concentrations, and catalyst particle sizes. Data were collected in a batch reactor. Experiments were done following a sequence of factorial experimental designs.

scholarly journals An Experimental Study of the Decomposition and Carbonation of Magnesium Carbonate for Medium Temperature Thermochemical Energy Storage

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1316
Author(s):  
Daniel Mahon ◽  
Gianfranco Claudio ◽  
Philip Eames
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Energy Storage ◽  
Magnesium Carbonate ◽  
Experimental Results ◽  
Future Research ◽  
Medium Temperature ◽  
Different Temperatures ◽  
Decomposition Enthalpy ◽  
Co2 Atmosphere

To improve the energy efficiency of an industrial process thermochemical energy storage (TCES) can be used to store excess or typically wasted thermal energy for utilisation later. Magnesium carbonate (MgCO3) has a turning temperature of 396 °C, a theoretical potential to store 1387 J/g and is low cost (~GBP 400/1000 kg). Research studies that assess MgCO3 for use as a medium temperature TCES material are lacking, and, given its theoretical potential, research to address this is required. Decomposition (charging) tests and carbonation (discharging) tests at a range of different temperatures and pressures, with selected different gases used during the decomposition tests, were conducted to gain a better understanding of the real potential of MgCO3 for medium temperature TCES. The thermal decomposition (charging) of MgCO3 has been investigated using thermal analysis techniques including simultaneous thermogravimetric analysis and differential scanning calorimetry (TGA/DSC), TGA with attached residual gas analyser (RGA) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) (up to 650 °C). TGA, DSC and RGA data have been used to quantify the thermal decomposition enthalpy from each MgCO3.xH2O thermal decomposition step and separate the enthalpy from CO2 decomposition and H2O decomposition. Thermal analysis experiments were conducted at different temperatures and pressures (up to 40 bar) in a CO2 atmosphere to investigate the carbonation (discharging) and reversibility of the decarbonation–carbonation reactions for MgCO3. Experimental results have shown that MgCO3.xH2O has a three-step thermal decomposition, with a total decomposition enthalpy of ~1050 J/g under a nitrogen atmosphere. After normalisation the decomposition enthalpy due to CO2 loss equates to 1030–1054 J/g. A CO2 atmosphere is shown to change the thermal decomposition (charging) of MgCO3.xH2O, requiring a higher final temperature of ~630 °C to complete the decarbonation. The charging input power of MgCO3.xH2O was shown to vary from 4 to 8136 W/kg with different isothermal temperatures. The carbonation (discharging) of MgO was found to be problematic at pressures up to 40 bar in a pure CO2 atmosphere. The experimental results presented show MgCO3 has some characteristics that make it a candidate for thermochemical energy storage (high energy storage potential) and other characteristics that are problematic for its use (slow discharge) under the experimental test conditions. This study provides a comprehensive foundation for future research assessing the feasibility of using MgCO3 as a medium temperature TCES material. Future research to determine conditions that improve the carbonation (discharging) process of MgO is required.

scholarly journals Exfoliation in a low boiling point solvent and electrochemical applications of MoO3

2020 ◽  
Vol 11 ◽  
pp. 662-670
Author(s):  
Matangi Sricharan ◽  
Bikesh Gupta ◽  
Sreejesh Moolayadukkam ◽  
H S S Ramakrishna Matte
Keyword(s):  
Energy Storage ◽  
Electrode Material ◽  
Electronic Devices ◽  
High Specific Capacitance ◽  
Two Dimensional ◽  
Energy Storage Devices ◽  
Intrinsic Nature ◽  
Storage Devices ◽  
Scan Rate ◽  
First Time

MoO3 is a versatile two-dimensional transition metal oxide having applications in areas such as energy storage devices, electronic devices and catalysis. To efficiently utilize the properties of MoO3 arising from its two-dimensional nature exfoliation is necessary. In this work, the exfoliation of MoO3 is carried out in 2-butanone for the first time. The achieved concentration of the dispersion is about 0.57 mg·mL−1 with a yield of 5.7%, which are the highest values reported to date. These high values of concentration and yield can be attributed to a favorable matching of energies involved in exfoliation and stabilization of MoO3 nanosheets in 2-butanone. Interestingly, the MoO3 dispersion in 2-butanone retains its intrinsic nature even after exposure to sunlight for 24 h. The composites of MoO3 nanosheets were used as an electrode material for supercapacitors and showed a high specific capacitance of 201 F·g−1 in a three-electrode configuration at a scan rate of 50 mV·s−1.

Micromachined Methanol Steam Reforming System Integrated With Catalytic Combustor Using Carbon Nanotubes as Catalyst Supports

2006 ◽  
Author(s):  
Dae-Eun Park ◽  
Tae-Kyu Kim ◽  
Sejin Kwon ◽  
Choong-Ki Kim ◽  
Euisik Yoon
Keyword(s):  
Carbon Nanotubes ◽  
Processing System ◽  
Pt Catalyst ◽  
Catalyst Supports ◽  
Fuel Processing ◽  
Reforming Catalyst ◽  
Coating Method ◽  
Catalytic Hydrogen ◽  
Catalytic Combustor ◽  
First Time

In this paper we have successfully demonstrated a new micromachined fuel processing system including vaporizer, catalytic combustor and methanol steam reformer. This fuel processing system utilizes the thermal energy generated from the catalytic hydrogen combustion to heat up the entire system. For the first time, we have used carbon nanotubes as a supporting structure of Pt catalyst for combustion. The catalytic combustor could supply the energy to heat the reformer and maintain its working temperature. We have also developed a new coating method of reforming catalyst (Cu/ZnO/Al2O3) and observed that adequate amount of hydrogen can be generated for PEMFC. We have successfully reported the feasibility of the proposed fuel processing system in each assembled component.

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