New Niobate Based Catalyst for Organic Dye Oxidation: A Mechanistic Approach

New Niobate Based Catalyst for Organic Dye Oxidation: A Mechanistic Approach

In this work, we aimed to demonstrate new polyoxoniobate containing surface peroxo groups obtained after the treatment of niobic acid with hydrogen peroxide and lyophilization process. Raman and diffuse reflectance measurements confirm the presence of peroxo groups in the new polyoxometalate. Isothe...

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Bibliographic Details
Published in:Water, air, and soil pollution Vol. 235; no. 10; p. 679
Main Authors: Bruziquesi, Carlos Giovani O., Filho, José Balena G., Mansur, Herman S., Chagas, Poliane, Mansur, Alexandra A. P., Oliveira, Luiz Carlos A., Silva, Adilson C.
Format: Journal Article
Language:English
Published: Cham Springer International Publishing 01-10-2024
Springer Nature B.V
Subjects:
Atmospheric Protection/Air Quality Control/Air Pollution
Catalysts
Climate Change/Climate Change Impacts
Discoloration
Dyes
Earth and Environmental Science
Environment
Freeze drying
Hydrogen
Hydrogen peroxide
Hydrogeology
Morphology
Oxidation
Polyoxometallates
Raw materials
Reflectance
Scanning electron microscopy
Soil Science & Conservation
Water Quality/Water Pollution
Peroxo
Niobate
Congo red
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Summary:In this work, we aimed to demonstrate new polyoxoniobate containing surface peroxo groups obtained after the treatment of niobic acid with hydrogen peroxide and lyophilization process. Raman and diffuse reflectance measurements confirm the presence of peroxo groups in the new polyoxometalate. Isotherms from N 2 adsorption/desorption have evidenced a drastic change in specific surface area after treatment with hydrogen peroxide, from 195 m 2 .g −1 for Nb1 to 4 m 2 .g −1 for Nb3. Catalytic studies were performed for Congo red (CR) oxidation using H 2 O 2 as oxidizing promoter. The results showed a new material with larger specific area, smaller particle size and an increase in peroxo groups, thus leading to higher catalytic response of discoloration of the Congo red (about 70% for Nb3 and close to 20% for the other catalysts) as compared with the raw material, without previous treatment.
ISSN:0049-6979
1573-2932
DOI:10.1007/s11270-024-07480-z