Magnetic MFe2O4-Ag2O (M = Zn, Co, &amp; Ni) composite photocatalysts and their application for dye wastewater treatment

Sun, Fujin; Zeng, Qihui; Tian, Wen; Zhu, Yingming; Jiang, Wei

doi:10.1016/j.jece.2019.103011

Cited by 17 publications

(6 citation statements)

References 56 publications

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“…Similarly, photoexcited electrons can react with O 2 to form other reactive oxygen species that can be used to further degrade pollutants [132,137]. The photocatalytic degradation of organic pollutants, such as rhodamine B, imidacloprid, and acetamiprid, has been reported for Ag/AgBr/NiFe 2 O 4 and ZnO/CoFe 2 O 4 [138][139][140][141].…”

Section: Photodegradation Mechanismmentioning

confidence: 99%

A Review on Impacting Parameters for Photocatalytic Degradation of Organic Effluents by Ferrites and Their Nanocomposites

et al. 2023

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Traditional wastewater treatment methods, such as reverse osmosis, adsorption, desalination, and others, are outweighed by the photocatalytic degradation of organic pollutants. Ferrites are prominent photocatalysts due to their tunable band gaps, surface areas, and magnetic properties, which render photodegradation economical. Ferrites and their nanocomposites have been reported as promising visible light active photocatalysts. The photocatalytic system is heavily reliant on a number of factors that influence the photodegradation of organic effluents. This review demonstrates various parameters such as substrate concentration, pH of solution, photocatalyst quantity, photocatalyst surface area, metal and non-metal ion doping, light intensity, irradiation time, quenchers, etc. affecting the photocatalytic degradation of organic effluents by ferrite nanoparticles and their nanocomposites in detail. The photodegradation efficiency of the ferrite nanoparticles alters with the change in the value of pH of the solution, which further depends upon the nature of the pollutant used. A dose of the substrate and the photocatalyst must be optimized so as to attain better photodegradation efficiency. Photocatalysts with different surface areas change the amount of active sites, which in turn affects the degradation of pollutant and render it a crucial factor. In addition, the mechanism of the action of photocatalysis is elaborated in this review. Future research perspectives for the advancement of ferrites and their nanocomposites are deliberated in order to improve their use as photocatalysts.

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Section: Photodegradation Mechanismmentioning

confidence: 99%

A Review on Impacting Parameters for Photocatalytic Degradation of Organic Effluents by Ferrites and Their Nanocomposites

et al. 2023

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“…The activation energy of the reaction was calculated using Arrhenius equation 36 . k app = A e − Ea /RT (7) where k app is the apparent reaction rate constant, A is the Arrhenius factor, E a is the activation energy (J/mol), R is the ideal gas constant (8.314 J/molK), and T is the temperature (K). The logarithmic form of Eq.…”

Section: Kinetic and Thermodynamic Studiesmentioning

confidence: 99%

“…Spinel ferrites such as ZnFe 2 O 4 , CoFe 2 O 4 , and NiFe 2 O 4 are used in medicines, sensors, and catalyst carriers thanks to their high mechanical strength, magnetic properties, unique structure, and catalytic performance. 7,8 The use of zeolites modified with semiconductors can be an alternative catalyst for a variety of important reactions. 1,2 Zeolites are crystalline aluminosilicates with cavities, unique structures and chemical compositions, uniform pores and channels, high surface area, thermal stability, and an excellent adsorption ability.…”

Section: Introductionmentioning

confidence: 99%

Decolorization of Direct Black 22 by Photo Fenton like Method Using UV Light and Zeolite Modified Zinc Ferrite: Kinetics and Thermodynamics

Fındık

2022

ACSi

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In this study, a heterogeneous catalyst was prepared to enhance photo-Fenton like oxidation of Direct Black-22 (DB-22). Zeolite modified with zinc ferrite was used as a catalyst. The prepared catalyst was characterized using FTIR, SEM, EDS and XRD. The effect of various parameters like catalyst modification with HCl, H2O2 amount, catalyst amount, CaCl2 amount, initial pH, initial concentration and temperature on the decolorization of DB-22 was studied under UV light. Kinetic and thermodynamic properties were investigated. The highest decolorization of DB-22 was found to be 93.3% under the following conditions: initial concentration: 0.070 g/L, initial temperature: 25 °C, original pH, H2O2 amount: 2.78 g/L, m-ZZF amount: 3 g/L, CaCl2 amount: 3.75 g/L, reaction time: 60 min and UV light. The activation energy was found to be –14.76 kJ/mol under the studied conditions. The decolorization reaction was an exothermic reaction, and the calculated reaction enthalpy was –17.31 kJ/mol. The activation entropy was calculated to be –0.326 kJ/mol. The standard Gibbs free energy change of the activation had a positive value, and it increased with increasing temperature.

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“…However, a reduction in the cost of the Ag2O photocatalyst and enhancement of its separation efficiency is needed to satisfy practical demands. Recently, Fujin et al, [273] have synthesized the construct Ag2O/MFe2O4 (M = Co, Zn, Ni) composites to reduce the cost of Ag consumption and enhance the recovery rate. The three obtained composites show high photodegradation efficiency towards the organic pollutants (MO, MB, RhB, and phenol).…”

Section: Spinel Ferrites and Their Compositesmentioning

confidence: 99%

Insight on water remediation application using magnetic nanomaterials and biosorbents

Maksoud

Elgarahy

Farrell

et al. 2020

Coordination Chemistry Reviews

234

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Adsorption to date is the most effective and utilized technology globally to remove several pollutants in wastewater. In this approach, many adsorbents have been synthesized, tested and used for the elimination and separation of the contaminants such as radionuclides, heavy metals, dyes and pharmaceutical compounds both at lab and industrial scale. However, there are many challenges to adsorption processes such as reducing the high cost, through means of separation of suspending adsorbents to be used again, as well as the ease to synthesize. Two methods that have shown promising results and gained significant interest is that of magnetic nanomaterials and biosorbents due to their effective, safe, eco-friendly, low cost and low-energy intensive material properties. Magnetic nanomaterials act as efficient adsorbents due to their ease of removal of contaminants from wastewater using an applied magnetic field but also their advantageous surface charge and redox activity characteristics. On the other hand, biosorbents have a synergistic effect with their efficient adsorption capacity to remove contaminants, high abundance and participation in waste minimization, helping alleviate ecological and environmental problems. This review highlights, discusses and reports on the state-of-the-art of these two promising routes to adsorption and provides indications as to what are the optimum materials for utilization and insight into their efficiency, reusability and practicality for the removal of pollutants from wastewater streams. Some of the main material focuses are zero-valent iron, iron oxides, spinel ferrites, natural and waste-based biosorbents.

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Magnetic MFe2O4-Ag2O (M = Zn, Co, & Ni) composite photocatalysts and their application for dye wastewater treatment

Cited by 17 publications

References 56 publications

A Review on Impacting Parameters for Photocatalytic Degradation of Organic Effluents by Ferrites and Their Nanocomposites

A Review on Impacting Parameters for Photocatalytic Degradation of Organic Effluents by Ferrites and Their Nanocomposites

Decolorization of Direct Black 22 by Photo Fenton like Method Using UV Light and Zeolite Modified Zinc Ferrite: Kinetics and Thermodynamics

Insight on water remediation application using magnetic nanomaterials and biosorbents

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