scholarly journals Hydrogen Production through Catalytic Water Splitting Using Liquid-Phase Plasma over Bismuth Ferrite Catalyst

2021 ◽  
Vol 22 (24) ◽  
pp. 13591
Author(s):  
Kyong-Hwan Chung ◽  
Hyun-Hak Jung ◽  
Sun-Jae Kim ◽  
Young-Kwon Park ◽  
Sang-Chai Kim ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Visible Light ◽  
Bismuth Ferrite ◽  
Sol Gel ◽  
Optical Emission ◽  
Decomposition Reaction ◽  
H2 Production ◽  
Emission Spectrometry ◽  
Direct Irradiation ◽  
Liquid Phase Plasma

This study examined the H2 production characteristics from a decomposition reaction using liquid-phase plasma with a bismuth ferrite catalyst. The catalyst was prepared using a sol–gel reaction method. The physicochemical and optical properties of bismuth ferrite were analyzed. H2 production was carried out from a distilled water and aqueous methanol solution by direct irradiation via liquid-phase plasma. The catalyst absorbed visible-light over 610 nm. The measured bandgap of the bismuth ferrite was approximately 2.0 eV. The liquid-phase plasma emitted UV and visible-light simultaneously according to optical emission spectrometry. Bismuth ferrite induced a higher H2 production rate than the TiO2 photocatalyst because it responds to both UV and visible light generated from the liquid-phase plasma.

scholarly journals Enhanced Photocatalytic Activity of Semiconductor Nanocomposites Doped with Ag Nanoclusters Under UV and Visible Light

Catalysts ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 31 ◽  
Author(s):  
Jorge González-Rodríguez ◽  
Lucía Fernández ◽  
Yanina B. Bava ◽  
David Buceta ◽  
Carlos Vázquez-Vázquez ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Inductively Coupled Plasma ◽  
Emerging Contaminants ◽  
Low Cost ◽  
Optical Emission ◽  
Silver Nanoclusters ◽  
Emission Spectrometry ◽  
Wide Range ◽  
Semiconductor Nanocomposites

Emerging contaminants (ECs) represent a wide range of compounds, whose complete elimination from wastewaters by conventional methods is not always guaranteed, posing human and environmental risks. Advanced oxidation processes (AOPs), based on the generation of highly oxidizing species, lead to the degradation of these ECs. In this context, TiO2 and ZnO are the most widely used inorganic photocatalysts, mainly due to their low cost and wide availability. The addition of small amounts of nanoclusters may imply enhanced light absorption and an attenuation effect on the recombination rate of electron/hole pairs, resulting in improved photocatalytic activity. In this work, we propose the use of silver nanoclusters deposited on ZnO nanoparticles (ZnO–Ag), with a view to evaluating their catalytic activity under both ultraviolet A (UVA) and visible light, in order to reduce energetic requirements in prospective applications on a larger scale. The catalysts were produced and then characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and inductively coupled plasma-optical emission spectrometry (ICP-OES). As proof of concept of the capacity of photocatalysts doped with nanoclusters, experiments were carried out to remove the azo dye Orange II (OII). The results demonstrated the high photocatalytic efficiency achieved thanks to the incorporation of nanoclusters, especially evident in the experiments performed under white light.

Photocatalytic Activity of Bismuth Ferrite Nanoparticles Synthesized via Sol-Gel Route

2019 ◽  
Vol 233 (5) ◽  
pp. 595-607 ◽  
Author(s):  
Mohsin Siddique ◽  
Noor Muhammad Khan ◽  
Muhammad Saeed
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Bismuth Ferrite ◽  
Sol Gel ◽  
Reaction System ◽  
Light Conditions ◽  
X Ray Diffraction ◽  
Light Region ◽  
Gel Technique

Abstract Nanosized, magnetically separable bismuth ferrite (BFO) nanoparticles, pertaining a crystallite size in the range of 14–15 nm were prepared via facile sol-gel technique. The product was characterized by scanning electron microscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy. The product was explored for the photocatalytic mineralization of rhodamine B (RB) dye in aqueous medium. The effect of different investigational parameters such as amount of photocatalyst, initial dye concentration and irradiation time on the photocatalytic degradation of RB was studied. The results reveal that the catalyst shows good degrading ability under normal pH and visible light conditions. BFO nanoparticles demonstrated a strong absorption ability in the visible-light region, which lead to efficient photocatalytic degradation of RB dye The reaction system was heterogeneous in nature in which the catalyst can be separated by a normal magnet.

Ru/TiO2 Nanostructured Catalysts: Synthesis, Characterization and Catalytic Activity Towards Hydrogenation of Ethyl Levulinate

2021 ◽  
Vol 21 (12) ◽  
pp. 6160-6167
Author(s):  
Sakthivel Kumaravel ◽  
Sivakumar Thiripuranthagan ◽  
Elangovan Erusappan ◽  
Aishwarya Sivakumar ◽  
Saranraj Kumaravel ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Inductively Coupled Plasma ◽  
Sol Gel ◽  
Nanostructured Catalysts ◽  
Optical Emission ◽  
Morphological Properties ◽  
Emission Spectrometry ◽  
Experimental Conditions ◽  
Ethyl Levulinate ◽  
Ru Nanoparticles

Pristine TiO2 and x% Ru/TiO2 catalysts with different wt.% of Ru (x%= 1.5%, 2%, 2.5% and 3%) were synthesized using sol–gel and simple impregnation methods. Different characterization techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), High-resolution transmission electron microscope (HR-TEM), Inductively coupled plasma-optical emission spectrometry (ICP-OES) and Thermogravimetry/Differential thermal analysis (TG/DTA) were used to study the physicochemical and morphological properties. The XRD patterns of the as-prepared pristine TiO2 catalyst showed high crystalline nature. The HR-TEM images revealed that the Ru nanoparticles (NPs) were evenly dispersed on the TiO2 surface. The prepared catalysts were evaluated for their catalytic activity towards the liquid phase hydrogenation of ethyl levulinate under mild reaction conditions (ambient H2 pressure). Among the various catalysts, 2.5% Ru/TiO2 catalyst showed the maximum catalytic activity of 79% ethyl levulinate (EL) conversion with 82% selectivity of γ-valerolactone (GVL). The recyclability test revealed that the most active 2.5% Ru/TiO2 also showed the highest stability of the catalyst under optimized experimental conditions.

Photocatalystic Cathodic Protection of TiO2 Coating on AZ31 Magnesium Alloy

2011 ◽  
Vol 686 ◽  
pp. 280-286
Author(s):  
Zhen Lin Wang
Keyword(s):  
Magnesium Alloy ◽  
Cathodic Protection ◽  
Composite Coatings ◽  
Sol Gel ◽  
Optical Emission ◽  
Az31 Magnesium Alloy ◽  
Emission Spectrometry ◽  
Transitional Layer ◽  
Visible Light Photocatalyst ◽  
Co Doped

Nano TiO2and S, N co-doped TiO2composite coatings with WO3transitional layer were deposited on AZ31 magnesium alloy by sol-gel method. The morphologies, structure, mechanical properties, compositional depth profiles and anti-corrosion performance of the as prepared coatings were characterized by scanning electron microscope, X-ray diffraction, nanoscratch test, glowing discharge optical emission spectrometry and electrochemical method, respectively. The results show that the nano TiO2coatings are continuous, uniform and dense with thickness ca.3-5μm, elements in the interface diffuse mutually during heat treatment; S-N co-doped TiO2enhances the interface adhesion, WO3transitional layer increases the total coating thickness and strengthens the adhesion to substrate with respect to unitary TiO2coating; S, N co-doped TiO2acts as visible light photocatalyst that can provide permanent cathodic protection for AZ31 magnesium using WO3as electron restoring material.

Silver and Titanium Nanoparticles Used as Coating on Polyurethane Catheters

2017 ◽  
Vol 47 ◽  
pp. 17-23 ◽  
Author(s):  
S. Heilman ◽  
L.G.A. Silva
Keyword(s):  
Silver Nanoparticles ◽  
Titanium Dioxide ◽  
Inductively Coupled Plasma ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Antimicrobial Properties ◽  
Optical Emission ◽  
Venous Catheter ◽  
Emission Spectrometry ◽  
Raman Spectrometry

Silver nanoparticles have been used in the medical area due to their remarkable antimicrobial properties. In this sense titanium dioxide nanoparticles obtained by the sol-gel method were used as coating of catheters for subsequent impregnation of silver nanoparticles with gamma irradiation and electron beam at 25 and 50 kGy. This work aimed to study the use of the silver nanoparticles and titanium dioxide as coating of polyurethane Central Venous Catheter (CVC) for antimicrobial activity. Furthermore the amounts of titanium and silver present in the coated catheters had been evaluated by Inductively Coupled Plasma – Optical Emission Spectrometry (ICP OES). Therefore the Raman spectrometry was used to identify the polymorph of titanium oxide, rutile.

Photocatalytic degradation of 1,4-dioxane using liquid phase plasma on visible light photocatalysts

2020 ◽  
Vol 399 ◽  
pp. 123087 ◽  
Author(s):  
Y. -K. Park ◽  
Kyong-Hwan Chung ◽  
In-Soo Park ◽  
Sang-Chai Kim ◽  
Sun-Jae Kim ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Liquid Phase Plasma
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