Photocatalytic activity of Perovskites for degradation of dyes

2021 ◽  
Vol 25 (9) ◽  
pp. 146-150
Author(s):  
A.B. Bhavyasree ◽  
K.P. Latha ◽  
H.S. Jayanna
Keyword(s):  
Thermal Stability ◽  
Photocatalytic Activity ◽  
Magnetic Property ◽  
Metal Oxides ◽  
High Surface ◽  
High Surface Area ◽  
Research Field ◽  
Mixed Metal Oxides ◽  
Degradation Of Dyes ◽  
Broad Overview

Perovskites are mixed metal-oxides which have received much attention and more applicative interests in the research field as well as in industry due to their unique properties like high surface area, small size, excellent magnetic property, thermal stability and low price. Perovskites are effectively used as semiconductors, adsorbents, catalyst, Superconductors etc. The present study outlined the broad overview of the Perovskite as photocatalyst.

scholarly journals Two-step synthesis of Fe2O3and Co3O4nanoparticles: towards a general method for synthesizing nanocrystalline metal oxides with high surface area and thermal stability

RSC Advances ◽  
2012 ◽  
Vol 2 (1) ◽  
pp. 121-124 ◽  
Author(s):  
Junjiang Zhu ◽  
Xiaoying Ouyang ◽  
Ming-Yung Lee ◽  
Ryan C. Davis ◽  
Susannah L. Scott ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Metal Oxides ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Nanocrystalline Metal ◽  
General Method

Preparation and characterization of spinel-type high surface area Al2O3-ZnAl2O4 mixed metal oxides by an alkoxide route

1997 ◽  
Vol 8 (3-4) ◽  
pp. 187-192 ◽  
Author(s):  
C. Otero Areán ◽  
B. Sintes Sintes ◽  
G. Turnes Palomino ◽  
C. Mas Carbonell ◽  
E. Escalona Platero ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Mixed Metal Oxides ◽  
Spinel Type ◽  
Mixed Metal ◽  
Alkoxide Route

One-step-impregnation hard templating synthesis of high-surface-area nanostructured mixed metal oxides (NiFe2O4, CuFe2O4 and Cu/CeO2)

2011 ◽  
Vol 47 (37) ◽  
pp. 10473 ◽  
Author(s):  
Hoang Yen ◽  
Yongbeom Seo ◽  
Rémy Guillet-Nicolas ◽  
Serge Kaliaguine ◽  
Freddy Kleitz
Keyword(s):  
Metal Oxides ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Mixed Metal Oxides ◽  
Mixed Metal ◽  
One Step ◽  
Templating Synthesis ◽  
Hard Templating

scholarly journals Photocatalytic Decolorization of Methyl Red on Nanoporous Anodic ZrO2 of Different Crystal Structures

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 215
Author(s):  
Ewa Wierzbicka ◽  
Karolina Syrek ◽  
Klaudia Mączka ◽  
Grzegorz D. Sulka
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Elevated Temperatures ◽  
Aqueous Electrolyte ◽  
High Surface ◽  
High Surface Area ◽  
Methyl Red ◽  
Self Organized ◽  
Photocatalytic Decolorization ◽  
Perfect Adhesion

High surface area, self-organized nanoporous ZrO2 arrays with perfect adhesion to the Zr substrate were synthesized by anodization in an aqueous electrolyte containing (NH4)2SO4 and NH4F. The obtained semiconductor materials were tested as photocatalysts for decolorization of the methyl red (MR) as a model azo dye pollutant. It was demonstrated that as-synthesized anodic ZrO2 anodic layers are already crystalline and, therefore, do not require further thermal treatment to provide a high photocatalytic performance. However, photocatalytic efficiency could be improved by annealing at a relatively low-temperature of 350 °C. Higher annealing temperatures caused a gradual drop of photocatalytic activity. The photocatalytic behavior was correlated with the crystal phase transformation in anodic ZrO2. It was found that higher photocatalytic activity was observed for the tetragonal phase over the monoclinic phase (predominant at elevated temperatures). It results from the optimal and complex electronic structure of annealed ZrO2 with three different energy states having absorption edges at 2.0, 4.01 and 5.28 eV.

scholarly journals Single and Dual Metal Oxides as Promising Supports for Carbon Monoxide Removal from an Actual Syngas: The Crucial Role of Support on the Selectivity of the Au–Cu System

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 852 ◽  
Author(s):  
Bernay Cifuentes ◽  
Felipe Bustamante ◽  
Martha Cobo
Keyword(s):  
Metal Oxides ◽  
High Surface ◽  
High Surface Area ◽  
Carbon Deposits ◽  
Promising Strategy ◽  
Cu Catalysts ◽  
Dual Metal ◽  
Effect Of The Support ◽  
Lower Capacity

A catalytic screening was performed to determine the effect of the support on the performance of an Au–Cu based system for the removal of CO from an actual syngas. First, a syngas was obtained from reforming of ethanol. Then, the reformer outlet was connected to a second reactor, where Au–Cu catalysts supported on several single and dual metal oxides (i.e., CeO2, SiO2, ZrO2, Al2O3, La2O3, Fe2O3, CeO2-SiO2, CeO2-ZrO2, and CeO2-Al2O3) were evaluated. AuCu/CeO2 was the most active catalyst due to an elevated oxygen mobility over the surface, promoting CO2 formation from adsorption of C–O* and OH− intermediates on Au0 and CuO species. However, its lower capacity to release the surface oxygen contributes to the generation of stable carbon deposits, which lead to its rapid deactivation. On the other hand, AuCu/CeO2-SiO2 was more stable due to its high surface area and lower formation of formate and carbonate intermediates, mitigating carbon deposits. Therefore, use of dual supports could be a promising strategy to overcome the low stability of AuCu/CeO2. The results of this research are a contribution to integrated production and purification of H2 in a compact system.

Cr Doped TiO2 Supported on TUD-1 Photocatalyst for Dye Photodegradation

2014 ◽  
Vol 69 (5) ◽  
Author(s):  
Ooi Yee Khai ◽  
Leny Yuliati ◽  
Siew Ling Lee
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Xrd Analysis ◽  
Bandgap Energy ◽  
Doped Tio2 ◽  
Visible Light Driven ◽  
Synthesized Materials

New visible light driven photocatalysts of 1 mol% Cr doped TiO2 supported on TUD-1 have been successfully synthesized. The Cr-TiO2/xTUD-1 (x = 10, 20, 30, 40 and 50) photocatalysts were prepared via surfactant-free sol-gel method followed by wet impregnation procedures. XRD analysis revealed that both TiO2 and Cr were incorporated in the highly porous siliceous matrix. FTIR analysis showed the existence of Si-O-Ti in all the materials. As observed, tetrahedral-coordinated Ti species were dominant in Cr-TiO2/10TUD-1, Cr-TiO2/20TUD-1 and Cr-TiO2/30TUD-1. Meanwhile, octahedral- coordinated Ti species were the dominant species in Cr-TiO2/40TUD-1 and Cr-TiO2/50TUD-1. It has been demonstrated that the amount of TUD-1 as photocatalyst support affected the wavelength response and the bandgap energy of the resulting materials. All the materials have bandgap energy of ~2.9 eV. The photocatalytic performance of the synthesized materials was tested out in dye photodegradation under visible light irradiation at 298 K for 5 hours. Results showed that all Cr-TiO2/TUD-1 materials had higher photocatalytic activity than that of Cr-TiO2. This could be explained by the high surface area and porosity provided by TUD-1 in enhancing the adsorption and diffusivities of the dye molecules, hence leading to the promising photocatalytic activity. Among the materials prepared, Cr-TiO2/30TUD-1 appeared as the most superior photocatalyst which gave the highest dye photodegradation.

High surface area TiO2 nanoparticles: impact of carboxylporphyrin sensitizers in the photocatalytic activity

2020 ◽  
Vol 21 ◽  
pp. 100774
Author(s):  
Caique Prado Machado de Oliveira ◽  
Ana Luísa Almeida Lage ◽  
Dayse Carvalho da Silva Martins ◽  
Nelcy Della Santina Mohallem ◽  
Marcelo Machado Viana
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area
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