Exploiting the photocatalytic activity of gold nanoparticle-functionalized niobium oxide perovskites in nitroarene reductions

2017 ◽  
Vol 7 (23) ◽  
pp. 5758-5765 ◽  
Author(s):  
Emily K. Piggott ◽  
Taylor O. Hope ◽  
Bry W. Crabbe ◽  
Pierre-Michel Jalbert ◽  
Galina Orlova ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Gold Nanoparticle ◽  
Niobium Oxide ◽  
Photocatalytic Reaction ◽  
Oxide Perovskite

Novel gold nanoparticle@niobium oxide perovskite composites promote the photoreduction of para-substituted nitroarenes, where electron-withdrawing groups accelerate the photocatalytic reaction.

Gold nanoparticle-functionalized niobium oxide perovskites as photocatalysts for visible light-induced aromatic alcohol oxidations

2018 ◽  
Vol 96 (7) ◽  
pp. 664-671 ◽  
Author(s):  
Melissa Chassé ◽  
Geniece L. Hallett-Tapley
Keyword(s):  
Visible Light ◽  
Gold Nanoparticle ◽  
Niobium Oxide ◽  
Experimental Methodology ◽  
Light Sources ◽  
Organic Transformations ◽  
Ketyl Radical ◽  
Aromatic Alcohol ◽  
Oxide Perovskite ◽  
Carbonyl Products

Spherical gold nanoparticles have been supported onto the surface of potassium niobium oxide perovskites, an underdeveloped class of semiconductor in photocatalytic organic transformations. The nanoparticle dopants of 9.5 nm in diameter and surface plasmon absorption at 530 nm are examined as possible visible light induced catalysts using alcohol photooxidation as the probe reaction. The nanomaterial-induced photooxidation of a series of aromatic alcohols is examined, in the absence of solvent, as a function of base, H2O2, and catalyst concentrations, as well as using multiple visible light sources. This experimental methodology affords extremely selective photooxidation to the carbonyl products (>99%) in as little as 2 h. Using the results obtained from the substitution of the aromatic alcohol, the proposed photocatalytic mechanism is suggested to rely heavily on plasmon-initiated electron transfer from the gold nanoparticle surface to the potassium niobium oxide perovskite and subsequent reductive decomposition of H2O2. This photodegradation step is proposed to favor the formation of ketyl radical species, a key intermediate in the visible light induced mechanism that undergoes both an electron and proton transfer to facilitate formation of the final, carbonyl products. Furthermore, the gold nanoparticle – potassium niobium oxide catalyst exhibits moderate reusability, highly desired in the realm of heterogeneous catalysis.

Photocatalytic Activity of Suspended and Immobilized Niobium Oxide for Methanol Oxidation and Escherichia coli Inactivation

2016 ◽  
Vol 19 (2) ◽  
Author(s):  
Lidiane A. Morais ◽  
Cristina Adán ◽  
Antonio S. Araujo ◽  
Ana P.M.A. Guedes ◽  
Javier Marugán
Keyword(s):  
Escherichia Coli ◽  
Photocatalytic Activity ◽  
Methanol Oxidation ◽  
Niobium Oxide

AbstractMaterials based on niobium oxide (Nb

Study of Ni-V load acid-modified calcined kaolin

2015 ◽  
Vol 15 (2) ◽  
pp. 138-142 ◽  
Author(s):  
N Lkhagvajav ◽  
Q Zhang ◽  
Ts Tsedendorj
Keyword(s):  
Photocatalytic Activity ◽  
Sulfuric Acid ◽  
Photocatalytic Reaction ◽  
Natural Clay ◽  
Temperature Ratio ◽  
Photo Catalyst ◽  
Ft Ir ◽  
Low Costs ◽  
Calcined Kaolin ◽  
Effective Carrier

Kaolin as a natural clay mineral, is commercially available at low costs, which is of great importance. It has been demonstrated by existing research kaolin is a very effective carrier for photo catalyst, being able to promote the photocatalytic reaction process as well as improve the efficiency of reaction. The catalysts was characterized by FT-IR, XRD, UV-Vis spectra methods. Ni and V, amount of catalyst investigate. Simultaneously the effects of photocatalytic reaction activity about concentration of sulfuric acid, calcination temperature, ratio of Ni and V, amount of catalyst investigate. The experimental results show that the photocatalytic activity of calcined kaolin which is treated by 40% and loading Ni and V is significantly higher than other kaolin. The kaolin does not have the B acid and L acid peaks, but people could see the B acid and L acid peaks on the kaolin which is roasted and treated by sulfuric acid. In a certain range, the activity of the catalysts increase with the increasing of the concentration of acid.Journal of agricultural sciences №15 (02): 138-142, 2015

scholarly journals Cobalt Oxide-Modified Titanium Dioxide Nanoparticle Photocatalyst for Degradation of 2,4-Dichlorophenoxyacetic Acid

2017 ◽  
Vol 17 (2) ◽  
pp. 284 ◽  
Author(s):  
Leny Yuliati ◽  
Nur Azmina Roslan ◽  
Wai Ruu Siah ◽  
Hendrik Oktendy Lintang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Photocatalytic Degradation ◽  
Cobalt Oxide ◽  
Uv Light ◽  
Dichlorophenoxyacetic Acid ◽  
Photocatalytic Reaction ◽  
Impregnation Method ◽  
Titanium Dioxide Nanoparticle ◽  
2,4 Dichlorophenoxyacetic Acid

2,4-dichlorophenoxyacetic acid (2,4-D) has been recognized as a possibly carcinogenic compound to human, therefore, 2,4-D should be treated before it is discharged to the environment. Photocatalytic degradation of 2,4-D has been proposed as one of the best methods that offer environmentally safe process. In the present research, titanium dioxide (TiO2) was modified with cobalt oxide (CoO) and tested for photocatalytic degradation of 2,4-D under UV light irradiation. Different amounts of CoO (0.1, 0.5, 1 and 5 mol%) were added onto TiO2 by an impregnation method. The photocatalytic reaction was monitored and analyzed by measurement of 2,4-D absorbance using UV spectrophotometer. After 1 h photocatalytic reaction, it was confirmed that the sample with low loading of 0.1 mol% gave the highest photocatalytic activity among the bare and modified TiO2 photocatalysts. The photocatalytic activity was decreased with the increase of CoO loading, suggesting that the optimum amount of CoO was an important factor to improve the performance of TiO2. Based on fluorescence spectroscopy, such addition of CoO resulted in the reduced emission intensity, which showed the successful decrease in the electron-hole recombination.

scholarly journals PHOTOCATALYTIC ACTIVE SELF-CLEANING CEMENT-BASED MATERIALS. COMPOSITIONS, PROPERTIES, APPLICATION

2020 ◽  
pp. 16-25
Author(s):  
M. Antonenko ◽  
Yu. Ogurtsova ◽  
V. Strokova ◽  
E. Gubareva
Keyword(s):  
Photocatalytic Activity ◽  
Diffusion Processes ◽  
Photocatalytic Reaction ◽  
Active Materials ◽  
Concrete Mixtures ◽  
Developed Surface ◽  
Cement Based Materials ◽  
Cement System ◽  
Self Cleaning ◽  
Prospects Of Application

The paper reviews the available technologies for producing photocatalytic active self-cleaning materials based on cement, including concretes and dry building mixtures. Used photocatalytic additives and their influence on the cement system are considered. The applied methods for assessing the photocatalytic activity of self-cleaning cement materials are presented. The compositions of concrete mixtures, their properties, areas and prospects of application are analyzed. The main problems of development, production and application of photocatalytic active self-cleaning materials based on cement are presented. The main directions to increase the self-cleaning ability of photocatalytic active materials based on cement are: optimization of the microstructure of the photocatalyst and the composite with its use in the direction of creating a developed surface of the photocatalyst - hierarchical microstructure; it intensifies the diffusion processes of photocatalytic reaction reagents and increases the contact area photocatalyst with a pollutant; it absorbs and accumulates ultraviolet radiation waves; optimization of the phase composition of titanium dioxide - search for the ratio of the anatase and rutile phases, at which the maximum photocatalytic activity is achieved; choosing of economically feasible method for periodical updating of the surface of concrete products carbonized during operation in order to restore self-cleaning ability.

One-pot synthesis of gold nanoparticle/molybdenum cluster/graphene oxide nanocomposite and its photocatalytic activity

2013 ◽  
Vol 130-131 ◽  
pp. 270-276 ◽  
Author(s):  
Alexandre Barras ◽  
Manash R. Das ◽  
Rami Reddy Devarapalli ◽  
Manjusha V. Shelke ◽  
Stéphane Cordier ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Gold Nanoparticle ◽  
One Pot ◽  
One Pot Synthesis ◽  
Molybdenum Cluster

Synthesis and photocatalytic activity of electrospun niobium oxide nanofibers

2013 ◽  
Vol 48 (3) ◽  
pp. 1213-1217 ◽  
Author(s):  
Shishun Qi ◽  
Ruzhong Zuo ◽  
Yi Liu ◽  
Yu Wang
Keyword(s):  
Photocatalytic Activity ◽  
Niobium Oxide

Schottky barrier and surface plasmonic resonance phenomena towards the photocatalytic reaction: study of their mechanisms to enhance photocatalytic activity

2015 ◽  
Vol 5 (5) ◽  
pp. 2522-2531 ◽  
Author(s):  
Maksudur R Khan ◽  
Tan Wooi Chuan ◽  
Abu Yousuf ◽  
M. N. K. Chowdhury ◽  
Chin Kui Cheng
Keyword(s):  
Photocatalytic Activity ◽  
Schottky Barrier ◽  
Electron Flow ◽  
Photocatalytic Reaction ◽  
Plasmonic Resonance ◽  
Surface Plasmonic Resonance ◽  
Reaction Study ◽  
Resonance Phenomena ◽  
System P ◽  
Semiconductor System

The article reviews the mechanism, how Schottky barrier and the SPR phenomena help to improve a photoreaction, focusing on the paradox between the Schottky barrier and SPR in the matter of the way of electron flow in the metal/semiconductor system.

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