Effective reduction of p-nitrophenol by silver nanoparticle loaded on magnetic Fe3O4/ATO nano-composite

Karki, Hem Prakash; Ojha, Devi Prashad; Joshi, Mahesh Kumar; Kim, Han Joo

doi:10.1016/j.apsusc.2017.11.166

Cited by 48 publications

(15 citation statements)

References 59 publications

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“…The TOF value of catalytic reduction of 4-NP by Fe 3 O 4 –Au MCs is determined to be 2.874 min –1 . As summarized in Table , compared with the previously reported catalysts, − the proposed catalysts (Fe 3 O 4 –Au MCs) exhibit a much higher TOF value. Based on these results, we draw a conclusion that Fe 3 O 4 –Au MCs, as high-efficiency catalysts for convenient separation and reusability, have a very good practical application prospect in the catalytic degradation of organic pollutants.…”

Section: Results and Discussionmentioning

confidence: 80%

Fundamental Formation of Three-Dimensional Fe₃O₄ Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol

Chen

Xing³

et al. 2019

Ind. Eng. Chem. Res.

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In this study, the three-dimensional (3D) flowerlike porous Fe 3 O 4 microcrystals were prepared by a self-assembly approach with the assistance of ethylene glycol (EG). The generation mechanism of the 3D flowerlike Fe 3 O 4 microcrystals was revealed through controlling the parameters of the hydrothermal reaction time, the molar mass of the urea, and the calcination temperature. The proposed 3D flowerlike Fe 3 O 4 microcrystals exhibited superparamagnetic behaviors with high saturation magnetization (i.e., up to 73.1 emu• g −1 ) at room temperature. The Fe 3 O 4 −Au magnetic composites (MCs) were further prepared by a seed deposition process, and surface features were revealed by TEM, XRD, XPS, UV−vis, and SQUID techniques. Compared with the Fe 3 O 4 microcrystals themselves, the Au (∼20 nm) covered Fe 3 O 4 microcrystals provided efficient and recyclable catalytic performance (e.g., unprecedented high turnover frequency of 2.874 min −1 ) for 4-nitrophenol (4-NP). More importantly, the proposed Fe 3 O 4 −Au MCs could be used to reduce 4-NP for more than six cycles, elaborating that Fe 3 O 4 −Au MCs are promising catalysts in the field of environmental purification.

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Section: Results and Discussionmentioning

confidence: 80%

Fundamental Formation of Three-Dimensional Fe₃O₄ Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol

Chen

Xing³

et al. 2019

Ind. Eng. Chem. Res.

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“…The obtained absorbance data of the UV-visible spectrophotometer for the selected azo dyes and aromatic compound, rate constants are obtained by plotting ln (Ct/Co) versus t using Langmuir-Hinshelwood model as follows. [97] ln [44] Silver/iron oxide composite 4-NP: 0.185 min −1 -UV light [45] where, C o is the initial concentration of selected azo dye and aromatic compound and C t is the concentration of azo dye and aromatic compound at that specific time t, based on Beer-Lambert's law. [95] These rate constants are 0.7914, 0.9607, and 0.9599 min −1 for MB, MO and 4-NP, respectively as given in Figure 12.…”

Section: Photo-reduction Of 4-nitrophenol Under Uv Lightmentioning

confidence: 99%

Development of highly active, chemically stable and recyclable magnetic nanophotocatalyst based on plasmonic silver nanoparticles and photosensitive trans‐3‐(trans‐4‐imidazolyl) acrylic acid molecules

Amir

Ali

Baykal

et al. 2021

Applied Organom Chemis

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This study relates to the preparation of a novel nanophotocatalyst comprising of plasmonic silver nanoparticle, photosensitive trans‐3‐(trans‐4‐imidazolyl) acrylic acid (T3TTIA) and superparamagnetic iron oxide nanoparticles (SPION). This heterogeneous nano‐photocatalyst has been synthesized via hydrothermal route where T3TTIA works as a capping agent and linker for SPION and plasmonic Ag NPs, respectively. Structural, morphological, thermal, magnetic, optical, and catalytic properties have been analyzed in detailed. The spinel cubic type structure of nanocrystals of SPION and silver has been confirmed by XRD analysis. XPS analysis has confirmed the presence of Ag0, Fe3O4, and integral functional group. The strong chemical interaction of localized surface plasmonic Ag nanoparticles and SPION with photosensitive T3TIAA molecule has been revealed by both the IR and XPS analysis. The shape of the final products has been observed as spherical with average particle size of 12 ±0.8 nm (with low degree of agglomeration) as analyzed by scanning electron microscope (SEM) and high resolution transmission electron microscope (HR‐TEM). The superparamagnetic nature and high thermal stability of the products have been revealed by vibrating sample magnetometry (VSM) and thermogravimetric (TG) analysis, respectively. UV‐visible spectrophotometry analysis has confirmed the maximum absorbance peak at ~420 nm, indicates as the characteristic peak of surface plasmon resonance (SPR) for silver nanoparticles with a band gap value of 1.43 eV. Furthermore, Brunauer−Emmett−Teller (BET) analysis has demonstrated mesoporous characteristic of the product which follows type IV isotherms with the average surface area and pore size as 250.492 m2/g and 6.1442 nm, respectively. The potential catalytic applications of the as‐prepared nanocatalysts have been explored for the decolorization of methyl orange (MO), methylene blue (MB), and photo‐reduction of 4‐nitrophenol (4‐NP) under both Visible and UV light irradiations. The catalytic activity of the as‐prepared nanocatalyst has been compared with the recent reported magnetic nano‐catalysts. The SPION@T3TIAA‐Ag nanocatalyst has shown excellent catalytic behavior toward the treatment of the selected industrial dyes and organic pollutant with recovery and reusability capacity up to seven cycles without losing significant catalytic efficiency.

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“…In spite of their effectiveness which arises from their in situ application and great reactivity, nZVI have limitations including a lack of stability, passivation, and limited mobility due to the formation of agglomerates and retention within aquifers, difficult separation from the purified medium [15]. To help counteract these problems and, thus, enhance the potential of nZVI in remediation, a number of modifications to the nanoparticles have been developed to stabilize the particles such as coating, doping, emulsification, embedding the particles to a supporting matrix and forming bimetallic nanoparticles [11,12,15,60]. However, there remains significant challenges to their effective and sustainable use.…”

Section: Limitations and Challenges Of Using Nzvimentioning

confidence: 99%

Nanoremediation: Tiny Objects Solving Huge Environmental Problems

Rónavári

2021

NANOTEC

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Background:: The application of zero valent iron nanoparticles (nZVI) to remediate soil and groundwater has gained increased attention within the last decade, primarily due to its high reactivity, cost effectiveness and potential to treat a broad range of contaminants (e.g. chlorinated organic solvents, inorganic anions, or metals). Objective:: In this paper, the state of the art of the applicability of nanomaterials especially the most frequently used nZVI in soil and groundwater is presented. The purpose of this article is to give an overview of the current knowledge pertaining to the synthesis, employment, limitations, and risk of iron nanoparticles. Methods:: Therefore, the authors have reviewed and discussed the recent patents and papers related to the developments and approaches made on the synthesis of iron nanoparticles emphasizing the justification of green synthesis methods. The studies related to the effective use of nanoparticles in remediating organic and inorganic contaminants are addressed. The potential limitations, challenges, and risks of this innovative nanoremediation technology are also discussed. Results:: Studies suggest that nZVI have successfully been applied in nanoremediation, however little is known about the particles’ fate and impacts. Additionally, it has already been proven that synthesis and modification can largely determine the physicochemical and biological properties of the particles. Conclusion:: This review corroborates the suitability of nanoparticles in the remediation of contaminated media, simultaneously highlighting the work still needed to optimize the syntheses and careful use of such materials, concluding that comprehensive screenings should be performed prior nZVI applications to assess their behavior and impact on the environment and living systems.

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Effective reduction of p-nitrophenol by silver nanoparticle loaded on magnetic Fe3O4/ATO nano-composite

Cited by 48 publications

References 59 publications

Fundamental Formation of Three-Dimensional Fe₃O₄ Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol

Fundamental Formation of Three-Dimensional Fe₃O₄ Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol

Development of highly active, chemically stable and recyclable magnetic nanophotocatalyst based on plasmonic silver nanoparticles and photosensitive trans‐3‐(trans‐4‐imidazolyl) acrylic acid molecules

Nanoremediation: Tiny Objects Solving Huge Environmental Problems

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Effective reduction of p-nitrophenol by silver nanoparticle loaded on magnetic Fe3O4/ATO nano-composite

Cited by 48 publications

References 59 publications

Fundamental Formation of Three-Dimensional Fe3O4 Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol

Fundamental Formation of Three-Dimensional Fe3O4 Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol

Development of highly active, chemically stable and recyclable magnetic nanophotocatalyst based on plasmonic silver nanoparticles and photosensitive trans‐3‐(trans‐4‐imidazolyl) acrylic acid molecules

Nanoremediation: Tiny Objects Solving Huge Environmental Problems

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Fundamental Formation of Three-Dimensional Fe₃O₄ Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol

Fundamental Formation of Three-Dimensional Fe₃O₄ Microcrystals and Practical Application in Anchoring Au as Recoverable Catalyst for Effective Reduction of 4-Nitrophenol