Gold nanoparticles — Synthesis by Sterculia acuminata extract and its catalytic efficiency in alleviating different organic dyes

Bogireddy, Naveen Kumar Reddy; Anand, K.; Mandal, Badal Kumar

doi:10.1016/j.molliq.2015.07.027

Cited by 103 publications

(31 citation statements)

References 41 publications

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“…The exciting improvement on nanoparticle (NP) catalysts and their potential applications for the removal of dyes from different types of wastewater has gained remarkable scientific attention in the field of catalysis research [3][4][5] . Industrial wastewater would be possible to contain more than one kind of various organic dyes, among them methyl orange (MO), methyl violet (MV) and methylene blue (MB) can contribute a lot to worldwide environmental pollution 6,7 . Metallic NPs based catalytic process has shown a great potential for the degradation or removal of dyes due to their smaller size, large surface-to-volume ratios, huge number of active sites, strong electron transfer abilities, high efficiency and take less time to degrade dye 4,5 .…”

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confidence: 99%

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

Ghosh

Roy

Naskar

et al. 2020

Sci Rep

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Nanoparticle (NP) catalysts are widely used for removal of dyes for single use, but there is an acute need for developing catalysts with high efficiency and reusability for mixed dyes. Here we first optimized the process (reactant proportion, temperature, time, and pH) for biosynthesis of monometallic Ag, Au and bimetallic Au-Ag alloy NP catalysts using Polyalthia longifolia leaf extract. The biosynthesized NP catalysts were characterized by UV-vis, DLS, Zeta potential, TEM and EDX study while the probable biomolecules responsible for biosynthesis were identified by FTIR and GC-MS/MS analysis. The NPs are found to be mostly spherical in shape (size 5-20 nm) with prolonged stability. We evaluated their chemo-catalytic performance through degradation of dyes (methyl orange, methyl violet, methylene blue) in individual and ternary mixture in presence of NaBH 4. The degradation percentage (80.06-96.59% within 5 min), degradation kinetics (k = 0.361-1.518 min-1), half-life (T 50 = 0.457-1.920 min) and 80% degradation (T 80 = 1.060-4.458 min) of dyes indicated highest catalytic activity of alloy in ternary mixture. Here we report a unique vacuum filtration system using alloy coated beads with excellent catalytic activity which could be reused thrice for removal of hazardous ternary mixed dyes with great promise for environmental remediation.

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confidence: 99%

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

Ghosh

Roy

Naskar

et al. 2020

Sci Rep

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“…79 In the same way, decolorization of MG by Ag-AuNPs synthesized by cell-free extract of B. safensis after 48 hr was reported within the range of 86.1-92.6%. 5 There are reports of outstanding potentials of biosynthesized nanoparticles in dye biodegradation, 13,[80][81][82][83] and the system is viewed to be advantageous to other treatment techniques that are primarily involved in the concentration of dyes or transferring them from one phase to another. 5 3.6 | Antioxidant activities of Ag-AuNPs…”

Section: Antifungal Activities Of Ag-aunpsmentioning

confidence: 99%

Silver‐gold alloy nanoparticles biofabricated by fungal xylanases exhibited potent biomedical and catalytic activities

Elegbede

Lateef

Azeez

et al. 2019

Biotechnology Progress

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The search for biocompatible nanoparticles with vast applicability has impacted on exploration of various biomaterials for the synthesis of mono and bimetallic nanoparticles. Xylanase is widely regarded as an industrially important enzyme but its potentials in nanotechnological applications are yet to be fully explored. The current study investigates the exploit of xylanases of Aspergillus niger L3 (NE) and Trichoderma longibrachiatum L2 (TE) produced through valorization of corn‐cob, to synthesize silver‐gold alloy nanoparticles (Ag‐AuNPs). Characterization of the Ag‐AuNPs involved UV–vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy and transmission electron microscopy, while their prospective use as antimicrobial, antioxidant, catalytic, anticoagulant, and thrombolytic agents were studied. The biosynthesized Ag‐AuNPs were ruby red and light purple with surface plasmon resonance at 520 and 534 nm for NEAg‐AuNPs and TEAg‐AuNPs, respectively; while FTIR showed that protein molecules capped and stabilized the nanoparticles. The Ag‐AuNPs were anisotropic with spherical, oval, and irregular shapes having sizes ranging from 6.98 to 52.51 nm. The nanoparticles appreciably inhibited the growth of tested clinical bacteria (23.40–90.70%) and fungi (70.10–89.05%), and also scavenged 2,2‐diphenyl‐1‐picrylhydrazyl (48.51–53.79%) and hydrogen peroxide (80.5–95.50%). Furthermore, the Ag‐AuNPs degraded malachite green (91.39%) and methylene blue (47.10%). Moreover, the Ag‐AuNPs displayed outstanding anticoagulant and thrombolytic activities using human blood. This study further emphasizes the significance of xylanases in nanobiotechnology as it has established the potential of xylanases to synthesize Ag‐AuNPs, which is being reported for the first time.

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“…Aside the O-H stretching, at the region of 2919 cm −1 and 2914 cm −1 the presence of C-H bond in xanthone [34] and other compounds in the peel extract is significant. Bands of C-H bond from G. mangostana peel extract split into two, 2914 cm −1 and 2845 cm −1 , suggest that, after the formation of Au-NPs, the transmittance changed [35], while at the region of 1700 cm −1 it shows the presence of C=O stretching [36]. At the region of 1600-1500 cm −1 , C-C in ring aromatic bond also suggests the presence of aromatics structure exists in the G. mangostana extract.…”

Section: Fourier Transform Infrared Spectroscopy Studymentioning

confidence: 99%

Green Synthesis of Gold Nanoparticles Using Aqueous Extract ofGarcinia mangostanaFruit Peels

Lee

Shameli

Miyake

et al. 2016

Journal of Nanomaterials

114

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The synthesis of gold nanoparticles (Au-NPs) is performed by the reduction of aqueous gold metal ions in contact with the aqueous peel extract of plant, Garcinia mangostana (G. mangostana). An absorption peak of the gold nanoparticles is observed at the range of 540-550 nm using UV-visible spectroscopy. All the diffraction peaks at 2 = 38.48 ∘ , 44.85 ∘ , 66.05 ∘ , and 78.00 ∘ that index to (111), (200), (220), and (311) planes confirm the successful synthesis of Au-NPs. Mostly spherical shape particles with size range of 32.96 ± 5.25 nm are measured using transmission electron microscopy (TEM). From the FTIR results, the peaks obtained are closely related to phenols, flavonoids, benzophenones, and anthocyanins which suggest that they may act as the reducing agent. This method is environmentally safe without the usage of synthetic materials which is highly potential in biomedical applications.

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Gold nanoparticles — Synthesis by Sterculia acuminata extract and its catalytic efficiency in alleviating different organic dyes

Cited by 103 publications

References 41 publications

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

Process optimization for biosynthesis of mono and bimetallic alloy nanoparticle catalysts for degradation of dyes in individual and ternary mixture

Silver‐gold alloy nanoparticles biofabricated by fungal xylanases exhibited potent biomedical and catalytic activities

Green Synthesis of Gold Nanoparticles Using Aqueous Extract ofGarcinia mangostanaFruit Peels

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