Effect of NaBH 4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of p -nitrophenol

Bae, Sungjun; Gim, Suji; Kim, Hyungjun; Hanna, Khalil

doi:10.1016/j.apcatb.2015.10.006

Cited by 244 publications

(87 citation statements)

References 41 publications

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“…The reduction product 4-AP is less poisonous and an important intermediate for the synthesis of analgesic and antipyretic drugs such as paracetamol, phenacetin, and acetanilide. Owing to its easy measurement and complete conversion without byproducts [46], the catalytic reduction reaction of 4-NP to 4-AP with NaBH 4 as a reductant is widely used as a model reaction for the evaluation of catalytic activity [47,48].…”

Section: Nano Resmentioning

confidence: 99%

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

et al. 2016

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Emerging hierarchical MoS 2 /pillared-montmorillonite (MoS 2 /PMMT) hybrid nanosheets were successfully prepared through facile in-situ hydrothermal synthesis of MoS 2 within the interlayer of cetyltrimethylammonium bromide PMMT, and their catalytic performance was evaluated by the reduction reaction of 4-nitrophenol (4-NP) using NaBH 4 as a reductant. Microstructure and morphology characterization indicated that MoS 2 /PMMT exhibited hybrid-stacked layered structures with an interlayer spacing of 1.29 nm, and the MoS 2 nanosheets were intercalated within the montmorillonite (MMT) layers, with most of the edges exposed to the outside. The catalytic activity and stability of MoS 2 /PMMT were both enhanced by the MMT. With the MoS 2 /PMMT as the catalyst, the apparent reaction rate constant of the 4-NP reduction was 0.723 min −1 and was maintained at ~0.679 min −1 after five reaction cycles. The structural evolution of MoS 2 /PMMT and the possible catalysis mechanism for the reduction reaction of 4-NP were investigated. The as-prepared MoS 2 /PMMT hybrid nanosheets are promising candidates for catalytic application in the water-treatment and biomedical fields. The strategy developed in this study can provide insights for designing hybrid nanosheets with diverse heterogeneous two-dimensional (2D) nanomaterials.

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Section: Nano Resmentioning

confidence: 99%

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

et al. 2016

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“…Figure A displays the declining intensity of the characteristic peak of 4‐NP at 400 nm and a new developing peak at 300 nm with the passage of time, suggesting the complete reduction of 4‐NP within 15 min. Figure B shows a good linear relationship between ln(C t /C 0 ) and catalytic reaction time, demonstrating the pseudo first‐order kinetics of the catalytic reaction, described as −ln(C t /C 0 ) = −ln(A t /A 0 ) = kt, where C, A, k, and t belong to 4‐NP concentration, absorption at 400 nm in the UV–vis spectrum, first‐order rate constant (s −1 ) and reaction time, respectively . The k value for eight catalysis cycles shown in Figure D reveals a decline trend (see the second cycle and the detailed data in Figure S4, Supporting Information).…”

Section: Resultsmentioning

confidence: 75%

“…4‐Nitrophenol (4‐NP), a common environmental pollutant, causes harm to animals, humans, and crops. Its catalytic reduction to 4‐aminophenol (4‐AP) in the presence of excess sodium borohydride (NaBH 4 ) is well known and easily monitored by UV–vis spectroscopy . Therefore, it is selected to evaluate the catalytic performance of the Au‐gel prepared here.…”

Section: Resultsmentioning

confidence: 99%

“…After addition of 60 mg (Au: 0.108 mg) freeze‐dried Au‐gel that is packaged in a piece of gauze, the color of the 4‐NP solution quickly fades away, and the evolution process is well recorded by UV–vis spectroscopy. The absorbance with a peak at 400 nm is directly related to the concentration of 4‐NP, which reflects the progress of the reduction reaction with time . Figure A displays the declining intensity of the characteristic peak of 4‐NP at 400 nm and a new developing peak at 300 nm with the passage of time, suggesting the complete reduction of 4‐NP within 15 min.…”

Section: Resultsmentioning

confidence: 99%

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Gallol‐Tethered Injectable AuNP Hydrogel with Desirable Self‐Healing and Catalytic Properties

Zhao

Xiong

et al. 2018

Macro Chemistry & Physics

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Injectable self‐healing hydrogels have drawn growing attention for their extensive applications in biomedical fields. Hydrogels containing nanoparticles also exhibit promising potentials in catalysis, wastewater treatment, and organic synthesis. Inspired by the multifunction of gallol presented herein, a simple one‐pot method to produce a gallol‐tethered gelatin hydrogel via Schiff base under oxidizing conditions using various oxidants is presented. The hydrogels prepared by NaIO4‐induced cross‐linking present a high self‐healing rate (up to 84.5%), injectable ability, tunable mechanical property, flexible viscoelasticity, and macroporous structure owing to the combination of covalent cross‐linking and supramolecular interactions. HAuCl4 contributes to the 3D structure formation of the gelatin hydrogel via oxidation cross‐linking. It is reduced by the gallol groups to produce nanogold (AuNP)‐decorated hydrogel (Au‐gel). This Au‐gel is fully characterized by UV–vis, XRD, TEM, SEM, EDX, and ICP‐MS and exhibits a high‐catalytic activity for the reduction of 4‐nitrophenol. The solid Au‐gel catalyst is robust, easily recyclable, and reused at least eight times.

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“…However, by adding the entire sodium bromate to the solution all at once, the size of the nanoparticles was lowered to 50 nm; probably it takes place as a result of having no time for the particles to grow. Bae, Gim, Kim, and Hanna () studied the effect of sodium bromate addition on the size of the fabricated nZVI. They reported that without the addition of sodium bromate, chain‐shaped aggregates of ZVI were obtained (60–100 nm); however, by adding the 100 mM sodium bromate, the size of the nZVIs was drastically reduced to 50 nm and kept the same morphology (spherical shape).…”

Section: Resultsmentioning

confidence: 99%

Development of ternary nanoadsorbent composites of graphene oxide, activated carbon, and zero‐valent iron nanoparticles for food applications

Bagheri

Jafari

Eikani

2019

Food Science & Nutrition

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In this study, a ternary nanocomposite comprising graphene oxide and carbon loaded with zero‐valent iron nanoparticles was developed as a promising nanoadsorbent, especially for polyphenols available in food industry by‐products. The fabricated nanoadsorbents were characterized in terms of structural, morphological, and chemical attributes. Zero‐valent iron nanoparticles (nZVI) were produced by a modified method leading to the formation of nanoparticles below 50 nm. Also, active carbon was transformed to a needle‐like shape instead of its native shape so that the active surface area was drastically increased which favors the higher adsorption process. Moreover, the space between graphene oxide sheets was enhanced by ultrasonication so that more active carbon and nZVIs could be oriented between these sheets. Finally, the FTIR and Raman data demonstrated the formation of O‐H stretching groups and a D/G value of 0.85 corresponding to the maintenance of a desired structure of the graphene oxide sheets, respectively. To summarize, the developed nanocomposites can be employed as a promising tool for the adsorbance of food and beverage industry by‐products, especially polyphenols.

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Effect of NaBH 4 on properties of nanoscale zero-valent iron and its catalytic activity for reduction of p -nitrophenol

Cited by 244 publications

References 41 publications

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

Hierarchical MoS2 intercalated clay hybrid nanosheets with enhanced catalytic activity

Gallol‐Tethered Injectable AuNP Hydrogel with Desirable Self‐Healing and Catalytic Properties

Development of ternary nanoadsorbent composites of graphene oxide, activated carbon, and zero‐valent iron nanoparticles for food applications

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