Ag Nanoparticle/Nanofibrillated Cellulose Composite as an Effective and Green Catalyst for Reduction of 4-Nitrophenol

Heidari, Hannaneh

doi:10.1007/s10876-018-1351-0

Cited by 28 publications

(13 citation statements)

References 39 publications

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“…The band observed around 2915 cm −1 can be assigned to C−H vibrations . In CNF/PVA sample the band obtained at ∼1642 cm −1 is related to C=O groups of CNF . However, in composite samples the 1642 cm −1 band slowly disappear and 1546 cm −1 band related to COO ¯ asymmetric stretch become intense .…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial Activity of Composite Consisting of Cellulose Nanofibers and Silver Nanoparticles

et al. 2019

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In this work influence of silver (Ag) nanoparticles (NPs) on cellulose nanofibers (CNF) was investigated. Free standing composite films of CNF/ polyvinylalcohol (PVA) ‐ Ag NPs have been synthesized by ex‐situ method. Composite films with different Ag NPs content (1%, 10% and 20%) were obtained and characterized by various techniques such as UV‐visible absorption spectroscopy, field emission scanning electron microscopy (FESEM), Infrared (IR) spectroscopy and Thermo gravimetric analysis (TGA). A UV‐vis absorption spectroscopy study demonstrates that as Ag NPs content increases the optical transparency decreases. The FESEM studies of the composite films revealed the presence of Ag NPs with average size ∼ 20 nm. Infrared spectroscopy illustrates that the CNF/PVA and Ag NPs are bound through electrostatic interactions. Comparison of the thermal properties of the CNF/PVA and the CNF/PVA ‐ Ag composite films showed that the thermal stability is improved for the highest Ag content composite films. It is shown that the CNF/PVA ‐ Ag composites have potential antibacterial effects against Gram‐positive bacteria (Bacillus subtilis) and Gram‐negative bacteria (Escherichia coli).

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Section: Resultsmentioning

confidence: 99%

Antimicrobial Activity of Composite Consisting of Cellulose Nanofibers and Silver Nanoparticles

et al. 2019

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“…The absorption band in 2920 cm −1 assigned to the stretching vibrations of C−H.The absorption bands at the range of 1150–1030 cm −1 attributed to the stretching vibrations of the C−O and C−O−C bonds in cellulose structre. In both Fe 3 O 4 @NFC and Fe 3 O 4 @NFC/Ag‐1 nanocomposites, the vibration bands at 442, 584, and 632 cm −1 were corresponded to Fe−O groups [18,27,28] . which indicates that nano‐cellulose coated the magnetic Fe 3 O 4 NPs.…”

Section: Resultsmentioning

confidence: 93%

“…In the absence of the catalyst, the spectral band at 400 nm showed no significant change even after 50 min (Figure 8a). After the addition of composite catalysts into the 4‐NP and NaBH 4 solution, the peak of 4‐ nitrophenolate ion faded gradually, and simultaneously new absorption peak at 298 nm increased which was attributed to the formation of reduced product of 4‐aminophenol (4‐AP) [18] . However, the degradation with Fe 3 O 4 @NFC as catalyst was not complete even after about 50 min (Figure 8b).…”

Section: Resultsmentioning

confidence: 99%

Reductant‐Free and In‐Situ Green Synthesis of Ag Nanoparticles on Fe₃O₄@Nanocellulose and Their Catalytic Activity for the Reduction of Dyes

Heidari

Aliramezani

2021

ChemistrySelect

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In this work, magnetic nanofibrillated cellulose (Fe3O4@NFC) was prepared and used as green support and reducing agent for the facile synthesis of silver nanoparticles (Ag NPs) by the reflux and hydrothermal methods. The structure of the as‐prepared composites was characterized by various spectroscopic techniques including X‐ray diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, inductively coupled plasma atomic emission spectroscopy, vibrating sample magnetometer, and nitrogen adsorption‐desorption isotherms. The catalytic activity of synthetic nanocomposites by the reflux (Fe3O4@NFC/Ag‐1) and hydrothermal (Fe3O4@NFC/Ag‐2) methods was investigated in the removal of organic dyes. Moreover, the effects of catalyst amounts, pH values, and drying process on the catalytic activity were also evaluated. The results indicated that the Ag loading and specific surface area of freeze‐dried Fe3O4@NFC/Ag‐1 were 1.8 wt % and 37 m2 g−1, respectively. The catalyst showed the saturation magnetization of 23.5 emu g−1 and could be easily separated and reused again. The freeze‐dried Fe3O4@NFC/Ag‐1 (0.02 g) synthesized by the reflux method in neutral conditions (pH=7) showed high catalytic activity for the reduction of 4‐nitrophenol (4‐NP), methyl orange (MO), and methylene blue (MB) with rate constants of 40.7×10−3 s−1, 7.5×10−3 s−1, and 2.9×10−3 s−1, respectively.

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“…A classical method for solving this problem is immobilization or encapsulation of AgNPs on/into supporting matrices. These nanocomposites showed high catalytic activity for the reduction of environmental pollutants by sodium borohydride (NaBH 4 ) …”

Section: Introductionmentioning

confidence: 99%

“…These nanocomposites showed high catalytic activity for the reduction of environmental pollutants by sodium borohydride (NaBH 4 ). [14][15][16][17] The environmental pollution caused by organic water pollutants (dyes) such as 4-nitrophenol (4-NP) and methyl orange (MO) are of great concern for environment and human health. Because of most dyes are carcinogenic, toxic and resistant to biodegradation and thus remain for a long time in the environment.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic assisted synthesis of nanocrystalline cellulose as support and reducing agent for Ag nanoparticles: green synthesis and novel effective nanocatalyst for degradation of organic dyes

Heidari

Karbalaee

2019

Applied Organom Chemis

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In this study, nanocrystalline cellulose (NCC) prepared from microcrystalline cellulose using high‐intensity ultrasonication as mechanical method without any chemical treatment. The obtained NCC with around 30–50 nm diameters, utilized as support, reducing and stabilizing agent for in‐situ green and eco‐friendly synthesis of silver nanoparticles (Ag NPs). The catalytic activity of composite was examined for degradation of environmental pollutants. The structure of as‐synthesized composite (Ag@NCC) was characterized by ultraviolet–visible spectroscopy (UV–vis), field emission scanning electron microscopy (FE‐SEM); Transmission electron microscopy (TEM); Energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT‐IR), X‐ray diffraction (XRD) and thermogravimetric analysis (TGA). The results of the catalytic reaction experiments showed that spherically shaped silver nanoparticles of around 20 nm distributed on the surface of nanocellulose demonstrated high catalytic efficiency towards the removal of methyl orange (MO) and 4‐nitrophenol (4‐NP).

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Ag Nanoparticle/Nanofibrillated Cellulose Composite as an Effective and Green Catalyst for Reduction of 4-Nitrophenol

Cited by 28 publications

References 39 publications

Antimicrobial Activity of Composite Consisting of Cellulose Nanofibers and Silver Nanoparticles

Antimicrobial Activity of Composite Consisting of Cellulose Nanofibers and Silver Nanoparticles

Reductant‐Free and In‐Situ Green Synthesis of Ag Nanoparticles on Fe₃O₄@Nanocellulose and Their Catalytic Activity for the Reduction of Dyes

Ultrasonic assisted synthesis of nanocrystalline cellulose as support and reducing agent for Ag nanoparticles: green synthesis and novel effective nanocatalyst for degradation of organic dyes

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Ag Nanoparticle/Nanofibrillated Cellulose Composite as an Effective and Green Catalyst for Reduction of 4-Nitrophenol

Cited by 28 publications

References 39 publications

Antimicrobial Activity of Composite Consisting of Cellulose Nanofibers and Silver Nanoparticles

Antimicrobial Activity of Composite Consisting of Cellulose Nanofibers and Silver Nanoparticles

Reductant‐Free and In‐Situ Green Synthesis of Ag Nanoparticles on Fe3O4@Nanocellulose and Their Catalytic Activity for the Reduction of Dyes

Ultrasonic assisted synthesis of nanocrystalline cellulose as support and reducing agent for Ag nanoparticles: green synthesis and novel effective nanocatalyst for degradation of organic dyes

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Reductant‐Free and In‐Situ Green Synthesis of Ag Nanoparticles on Fe₃O₄@Nanocellulose and Their Catalytic Activity for the Reduction of Dyes