☆ 4.5 Article

The Study of Co-Ni-Mn Ferrites for the Catalytic Decomposition of 4-Nitrophenol

CATALYSIS LETTERS (2021)

Journal

CATALYSIS LETTERS

Volume 151, Issue 5, Pages 1522-1533

Publisher

SPRINGER

DOI: 10.1007/s10562-020-03419-1

Keywords

4-Nitrophenol; Ferrites; Photocatalytic oxidation; Contact nonequilibrium plasma; Precipitation; Simplex experimental design

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Abstract

Co-Ni-Mn ferrites were prepared using a modified method and their structural and photocatalytic properties were studied, demonstrating a correlation between EPR spectrum intensity and energy band gap with photocatalytic activity.

In this work, Co-Ni-Mn ferrites were prepared using a modified chemical co-precipitation method with contact nonequilibrium low-temperature plasma treatment. The structural properties of the ferrites samples were systematically studied using XRD, EPR spectroscopy, vibration magnetometry, and UV-VS spectra analysis. The photocatalytic properties of the prepared samples were comparatively studied during the photodegradation of 4-nitrophenol under UV illumination. The photodegradation rate of 4-nitrophenol (4-NP) in the photocatalytic process was 68-92%, depending on the composition of ferrites. The values of the reaction constant of 4-nitrophenol degradation were calculated. The simplex analysis method made it possible to establish the dependence of the photocatalytic properties of ferrites on the type of EPR spectrum and energy band gap. It was found that for the decomposition reaction of 4-NPs, the intensity of the EPR spectrum peak correlates with photocatalytic activity ferrites. It was established that the optimal compositions for the decomposition of 4-nitrophenol correspond to complex ferrites of nickel and cobalt. In the decomposition reaction of 4-NP, the appearance of galvanic pairs between cations in tetrahedral and octahedral positions is important. The photocatalytic activity in the 4-NP decomposition reaction increases in the series MnFe2O4 < NiFe2O4 < CoFe2O4, which corresponds to an increase in the intensity of the EPR spectra of ferrites. [GRAPHICS] .

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Metal ferrites nanoparticles for catalytic and photocatalytic ozonation in wastewater treatment: a review

Chuan Kian Pang, Collin G. G. Joseph, Yan Yan Farm, Jualang Azlan Gansau, Siow Hwa Teo, Yun Hin Taufiq-Yap, Rock Keey Liew

Summary: The discharge of pollutant-rich wastewater without adequate treatment poses a serious threat to the environment. Catalytic and photocatalytic ozonation using metal ferrite are promising methods for making the treated wastewater reusable. This review summarizes the recent advances in metal ferrite nanoparticle catalysts, exploring their preparation methods, characterization techniques, catalytic mechanisms, and modification strategies. Furthermore, the current applications of metal ferrites as ozone catalysts and the synergistic effect of catalytic and photocatalytic ozonation are discussed. The pollutant removal efficiencies using metal ferrite are 20-40% for non-catalytic ozonation, 80-98% for catalytic ozonation, and 60-80% for photocatalytic ozonation.

ENVIRONMENTAL CHEMISTRY LETTERS (2023)