In situ green synthesis of Ag nanoparticles on tea polyphenols-modified graphene and their catalytic reduction activity of 4-nitrophenol

Zhi-min, Wang; Chen, Xu; Li, Xin; Liu, Zhaohui

doi:10.1016/j.colsurfa.2015.09.015

Cited by 87 publications

(38 citation statements)

References 48 publications

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“…The photocatalysis based on nanomaterials involve in the effective capture of visible radiation, generation of electron‐hole pairs, and the efficient use of electron and/or hole before they recombine . Despite the fact that graphene and metal NPs are not good photocatalysts, the combination, i. e. graphene‐metal nanocomposites are better photocatalysts.…”

Section: Resultsmentioning

confidence: 99%

“…Thus the presence of trace amounts of these substances could potentially forbid graphene composites to utilize in bio and environmental applications. Further, the poisonous nature of these reducing reagents need great attention in handling during the synthesis and processing of the hazardous waste . Therefore, better green reducing agents needs to be developed in order to address the afore mentioned problems.…”

Section: Introductionmentioning

confidence: 99%

“…The use of plant extracts as reducing agents will effectively reduce the environmental pollution, production cost and produces biocompatible materials. Literature has witnessed the synthesis of graphene and its composites according to the green chemistry point of view using eco‐friendly reagents such as L‐ascorbic acid, L–Lysine, glucose, tea polyphenols, mortino berry extract, Fenugreek seeds extract, E. Helioscopia L. Leaf extract, E. Bungei Bioss, W. Coagulans leaf extract, barberry fruit extract, etc …”

Section: Introductionmentioning

confidence: 99%

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A Facile Green Reduction for Graphene‐Silver Nanocomposite Using Betel Leaf Extract for the Photocatalytic Degradation of Water Pollutants

2017

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Green leaves are utilized in the green synthesis of various nanomaterials as these are rich sources of various biomolecules useful to control the growth of nanoparticles and as reducing agents. In this report, the in situ synthesis of a nanocomposite of silver decorated on reduced graphene oxide sheets using betel leaf extract as stabilizing and reducing agent is presented. The formation of nanocomposite is confirmed by Ultraviolet‐Visible, Fourier Transform Infrared and Raman spectroscopic techniques. The X‐Ray Diffraction results revealed the Face Centered Cubic structure of silver nanoparticles (Ag NPs) with a particle size of 28 nm. The sheet structure of reduced graphene oxide and uniformly distributed Ag NPs on these sheets is confirmed by High Resolution Scanning Electron Microscope analysis. The obtained nanocomposite exhibited good photocatalytic efficiency (95% in 2 h) against a model pollutant, methylene blue in sun light.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Facile Green Reduction for Graphene‐Silver Nanocomposite Using Betel Leaf Extract for the Photocatalytic Degradation of Water Pollutants

2017

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“…nanoparticle composites, as compared to other systems, displayed similar catalytic ef ciency. 22,25) Figure 6 shows the kinetic activity in the reduction of 4-nitrophenol utilizing the composites as a catalyst. In previous research, the Langmuir-Hinshelwood model has been applied to the investigation of the kinetics of 4-nitrophenol reduction.…”

Section: Catalytic and Kinetic Activity Of [C 60 ]Fullerenementioning

confidence: 99%

“…[18][19][20][21] Some instances of the use of 4-nitrophenol reduction in previous classical reaction tests to evaluate catalytic properties of many nanosized metals, and similar kinetic studies with silver nanoparticles dispersed in other conducting matrices, are given in the following literature. [22][23][24] The dispersion of silver nanoparticles on nanosized [C 60 ]fullerene nanowhiskers is attractive for catalytic applications. 5,25) Therefore, here, we prepared hybrid nanocomposites with [C 60 ]fullerene nanowhiskers and silver nanoparticles using the liquid-liquid interfacial precipitation (LLIP) method, and investigated the characterization of [C 60 ]fullerene nanowhisker-silver nanoparticle composites and their catalytic activity for reduction of 4-nitrophenol in the presence of sodium borohydride.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Activity for Reduction of 4-Nitrophenol with [C<sub>60</sub>]Fullerene Nanowhisker-Silver Nanoparticle Composites

2016

Mater. Trans.

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Silver nanoparticle solution was prepared by the addition of silver nitrate (AgNO 3 ), trisodium citrate dihydrate (C 6 H 5 Na 3 O 7 ·2H 2 O), sodium borohydride (NaBH 4 ), cetyltrimethyl ammonium bromide ((C 16 H 33 )N(CH 3 ) 3 Br), and ascorbic acid (C 6 H 8 O 6 ), which was subsequently added to distilled water. The resulting solution was subjected to ultrasonic irradiation for 3 h. [C 60 ]fullerene nanowhisker-silver nanoparticle composites were prepared using C 60 -saturated toluene, silver nanoparticle solution, and isopropyl alcohol by the liquid-liquid interfacial precipitation (LLIP) method. The product of [C 60 ]fullerene nanowhisker-silver nanoparticle composites was con rmed by x-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. The activity of [C 60 ]fullerene nanowhisker-silver nanoparticle composites as a catalyst was characterized by the reduction of 4-nitrophenol by UV-vis spectroscopy.

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UV‐Triggered Polymerization, Deposition, and Patterning of Plant Phenolic Compounds

Behboodi-Sadabad

Zhang

Trouillet

et al. 2017

Adv Funct Materials

129

106

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Plant-derived phenolic compounds, rich in catechol and pyrogallol moieties, can form multifunctional coatings on various substrates following polymerization under mildly alkaline conditions. Despite many appealing features of such coatings, the difficulty to control polymerization of phenolic compounds spatially and temporally limits their number of potential applications. In this study, it is demonstrated that UV irradiation can trigger oxidative polymerization and deposition of plant-derived phenolic compounds, which opens the possibility to create 2D gradients and patterns of polyphenol coatings and control this polymerization temporally. UV-vis spectroscopy, electrospray ionization mass spectrometry, and cyclic voltammetry analyses are used to investigate the UV-induced polymerization of several plant-derived phenolic compounds including pyrogallol, tannic acid, caffeic acid, and gallic acid. Formation of polyphenol coatings on polar and nonpolar substrates after UV irradiation has been studied using water contact angle measurements, atomic force microscopy, time of flight secondary ion mass spectrometry, and X-ray photoelectron spectroscopy (XPS). The possibility to use UV-light to accelerate polymerization of phenolic compounds and perform micropatterning can extend the scope of potential applications of the large class of structurally diverse plant-derived phenolic compounds.

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In situ green synthesis of Ag nanoparticles on tea polyphenols-modified graphene and their catalytic reduction activity of 4-nitrophenol

Cited by 87 publications

References 48 publications

A Facile Green Reduction for Graphene‐Silver Nanocomposite Using Betel Leaf Extract for the Photocatalytic Degradation of Water Pollutants

A Facile Green Reduction for Graphene‐Silver Nanocomposite Using Betel Leaf Extract for the Photocatalytic Degradation of Water Pollutants

Catalytic Activity for Reduction of 4-Nitrophenol with [C<sub>60</sub>]Fullerene Nanowhisker-Silver Nanoparticle Composites

UV‐Triggered Polymerization, Deposition, and Patterning of Plant Phenolic Compounds

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