Magnetically separable Ag-Fe3O4 catalyst for the reduction of organic dyes

Khedkar, Chaitali V.; Khupse, Nageshwar D.; Thombare, Balu R.; Dusane, Pravin R.; Lole, Gaurav; Devan, Rupesh S.; Deshpande, Aparna; Patil, S. F.

doi:10.1016/j.cplett.2020.137131

Cited by 28 publications

(10 citation statements)

References 40 publications

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“…This would be beneficial both environmentally and economically, as less material would be necessarily dispersed into water sources in order to remove contamination, and less raw material would be needed to perform contaminant removal. A similar observation may be made for the catalytic nanomaterials reported that could serve to degrade contaminants either singly or in the presence of oxidizing agents such as hydrogen peroxide [37] and oxygen [105] or reducing agents such as borohydride [139,141]. 2We see an increasing usage of biological materials, both processed and unprocessed, in the generation of novel nanocomposite materials.…”

Section: Key Concepts For the Futurementioning

confidence: 60%

“…Silver nanoparticles were also bound to Fe 3 O 4 nanoparticles (average size, 20 nm) as reported by Patil et al [139] who then tested these composites in the reduction of 50 ppm solutions of organic dyes. It was observed that these nanocomposites achieved over 98% reduction of rhodamine B, over 80% of methylene blue and over 97% of nitrophenol in the presence of sodium borohydride in less than 5 min.…”

Section: Metallic/metal Oxide/magnetic Nanoparticle-based Nanocompositesmentioning

confidence: 99%

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Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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Water resources are of extreme importance for both human society and the environment. However, human activity has increasingly resulted in the contamination of these resources with a wide range of materials that can prevent their use. Nanomaterials provide a possible means to reduce this contamination, but their removal from water after use may be difficult. The addition of a magnetic character to nanomaterials makes their retrieval after use much easier. The following review comprises a short survey of the most recent reports in this field. It comprises five sections, an introduction into the theme, reports on single magnetic nanoparticles, magnetic nanocomposites containing two of more nanomaterials, magnetic nanocomposites containing material of a biologic origin and finally, observations about the reported research with a view to future developments. This review should provide a snapshot of developments in what is a vibrant and fast-moving area of research.

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Section: Key Concepts For the Futurementioning

confidence: 60%

Section: Metallic/metal Oxide/magnetic Nanoparticle-based Nanocompositesmentioning

confidence: 99%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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“…157 Moreover, Fe 3 O 4 /Ag (32 nm) NPs have catalytic activity toward the reduction of organic dyes. 158 Finally, Mn been utilized as radar-absorbing materials and as magnetic sensors with high stability. 159 Further research is required to elucidate the behavior of NPs in realistic environmental conditions considering the origin and composition of treated water.…”

Section: Applications Of Ferrofluidsmentioning

confidence: 99%

“…In addition, Fe 3 O 4 -loaded sawdust carbon and EDTA-modified (30 nm) NPs are a promising adsorbent for Cd(II) removal from aqueous media . Moreover, Fe 3 O 4 /Ag (32 nm) NPs have catalytic activity toward the reduction of organic dyes . Finally, Mn 1– x Zn x Fe 2 O 4 ferrofluids from natural sand have also been utilized as radar-absorbing materials and as magnetic sensors with high stability …”

Section: Applications Of Ferrofluidsmentioning

confidence: 99%

Approaches on Ferrofluid Synthesis and Applications: Current Status and Future Perspectives

et al. 2022

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Ferrofluids are colloidal suspensions of iron oxide nanoparticles (IONPs) within aqueous or nonaqueous liquids that exhibit strong magnetic properties. These magnetic properties allow ferrofluids to be manipulated and controlled when exposed to magnetic fields. This review aims to provide the current scope and research opportunities regarding the methods of synthesis of nanoparticles, surfactants, and carrier liquids for ferrofluid production, along with the rheology and applications of ferrofluids within the fields of medicine, water treatment, and mechanical engineering. A ferrofluid is composed of IONPs, a surfactant that coats the magnetic IONPs to prevent agglomeration, and a carrier liquid that suspends the IONPs. Coprecipitation and thermal decomposition are the main methods used for the synthesis of IONPs. Despite the fact that thermal decomposition provides precise control on the nanoparticle size, coprecipitation is the most used method, even when the oxidation of iron can occur. This oxidation alters the ratio of maghemite/magnetite, influencing the magnetic properties of ferrofluids. Strategies to overcome iron oxidation have been proposed, such as the use of an inert atmosphere, adjusting the Fe(II) and Fe(III) ratio to 1:2, and the exploration of other metals with the oxidation state +2. Surfactants and carrier liquids are chosen according to the ferrofluid application to ensure stability. Hence, a compatible carrier liquid (polar or nonpolar) is selected, and then, a surfactant, mainly a polymer, is embedded in the IONPs, providing a steric barrier. Due to the variety of surfactants and carrier liquids, the rheological properties of ferrofluids are an important response variable evaluated when synthesizing ferrofluids. There are many reported applications of ferrofluids, including biosensing, medical imaging, medicinal therapy, magnetic nanoemulsions, and magnetic impedance. Other applications include water treatment, energy harvesting and transfer, and vibration control. To progress from synthesis to applications, research is still ongoing to ensure control of the ferrofluids’ properties.

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“…Xia & Lo (2016), in turn, prepared a superparamagnetic nanocomposite (Bi 2 O 4 /Fe 3 O 4 ) for photocatalytic degradation of ibuprofen (Xia & Lo 2016), while Li et al (2019) used the magnetic catalyst Fe 3 O 4 @MIL-100(Fe) to remove sodium diclofenac from water by photocatalysis and adsorption (Li et al 2019). Besides them, Khedkar et al (2020) used Ag-Fe 3 O 4 MSC magnetic catalyst to reduce organic dyes where, according to the authors, the catalyst showed excellent catalytic activity (Khedkar et al 2020).…”

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confidence: 99%

Functioned catalysts with magnetic core applied in ibuprofen degradation

Lenzi

Lopes

Andrade

et al. 2021

Water Science and Technology

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In the present work, the performance of Ag/ZnO/CoFe2O4 magnetic photocatalysts in the photocatalytic degradation of Ibuprofen (IBP) was evaluated. This study considered the use of pure Ag/ZnO (5% Ag) and also use the Ag/ZnO/CoFe2O4 magnetic catalysts containing different amounts (5, 10 and 15% wt) of cobalt ferrite (CoFe2O4). The catalysts were characterized by Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and photoacoustic Spectroscopy. To carried the photocatalytic degradation reaction, different concentrations of the ibuprofen contaminant solution (10, 20 and 30 ppm) and different concentrations of photocatalyst were tested (0.3 gL−1, 0.5 gL−1 and 1.0 gL−1). The reaction parameters studied were: IBP concentration, catalyst concentration, adsorption and photolysis, influence of the matrix, radiation source (solar and artificial) and the effect of organic additive. At the end of the photocatalytic tests, the best operation conditions were defined. Considering the obtained results of degradation efficiency and magnetic separation, the optimal parameters selected to proceed with the other tests of the study were: ibuprofen solution concentration 10 ppm, Ag/ZnO/CoFe2O4(5%) catalyst at a concentration of 0.3 g L−1 and pH 4.5 of the reaction medium. The results indicated the feasibility of magnetic separation of the synthesized catalysts. A long duration test indicated that the catalyst exhibits stability throughout the degradation reaction, as more than 80% of ibuprofen was degraded after 300 minutes. The photocatalytic activity was directly affected by the ferrite load. The higher the nominal load of ferrite, the lower the performance in ibuprofen degrading. It was also observed that the smallest amount of ferrite studied was enough for the catalyst to be recovered and reused. The adsorption and photolysis tests did not show significant results in the IBP degradation. In addition, it was possible to verify that the aqueous matrix, the use of solar radiation and the addition of additive (acid formic) interfered direct in the process. The catalyst reuse tests indicated that it can be recovered and reused at least three times without considerable catalytic activity loss.

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Magnetically separable Ag-Fe3O4 catalyst for the reduction of organic dyes

Cited by 28 publications

References 40 publications

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Approaches on Ferrofluid Synthesis and Applications: Current Status and Future Perspectives

Functioned catalysts with magnetic core applied in ibuprofen degradation

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