Synthesis of noval gold nanomaterials and it's detection of sewage

2019 ◽  
Vol 14 (2) ◽  
pp. 365-370
Author(s):  
Furong Nie ◽  
Jun Ai
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Pore Structure ◽  
Adsorption Experiment ◽  
Au Nps ◽  
Fluorescent Signal ◽  
Novel Approach ◽  
Gold Nanomaterials ◽  
First Time

Abstract In this article we report a novel approach to polyvinyl pyrrolidone k-30 (PVP)-templated formation of fluorescent gold nanoparticles (Au NPs) with pore structure and its application to sewage detection. For the first time the method of generating PVP-encapsulated Au NPs in aqueous solution is demonstrated. It was found that the formation of fluorescent Au NPs have highly fluorescent signal. Through the adsorption experiment, it is concluded that the methylene blue is adsorbed on Au NPs. This work successfully develops the capping PVP scaffolds of fluorescent Au NPs with pore structure. This experiment lays a foundation for the application of Au NPs in the field of environmental applications.

Green synthesis and characterization of gold nanoparticles embedded into magnetic carbon nanocages and their highly efficient degradation of methylene blue

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28774-28780 ◽  
Author(s):  
Wei Zuo ◽  
Gaosong Chen ◽  
Fengjuan Chen ◽  
Siliang Li ◽  
Baodui Wang
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Green Synthesis ◽  
Synthesis And Characterization ◽  
Au Nps ◽  
Selective Degradation ◽  
Highly Efficient ◽  
Magnetic Carbon

We reported the Au NPs/MCNSs nanohybrids as the catalysts for the highly efficient and selective degradation of methylene blue.

scholarly journals In situ reduced MXene/AuNPs composite toward enhanced charging/discharging and specific capacitance

2021 ◽  
Author(s):  
Zixiang Zheng ◽  
Wei Wu ◽  
Tao Yang ◽  
Enhui Wang ◽  
Zhentao Du ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Energy Density ◽  
Specific Capacitance ◽  
Reduction Reaction ◽  
Cyclic Stability ◽  
Promising Candidate ◽  
Symmetric Supercapacitor ◽  
First Time

AbstractIn this work, gold nanoparticles (AuNPs) decorated Ti3C2Tx nanosheets (MXene/AuNPs composite) are fabricated through a self-reduction reaction of Ti3C2Tx nanosheets with HAuCl4 aqueous solution. The obtained composite is characterized as AuNPs with the diameter of about 23 nm uniformly dispersing on Ti3C2Tx nanosheets without aggregation. The composite (MXene decorated on 4.8 wt% AuNPs) is further employed to construct supercapacitor for the first time with a higher specific capacitance of 278 F·g−1 at 5 mV·s−1 than that of pure Ti3C2Tx and 95% of cyclic stability after 10,000 cycles. Furthermore, MXene/AuNPs composite symmetric supercapacitor with filter paper as separator and H2SO4 as electrolyte, is assembled. The supercapacitor exhibits a high volumetric energy density of 8.82 Wh·L−1 at a power density of 264.6 W·L−1 and ultrafast-charging/discharging performance. It exhibits as a promising candidate applied in integrated and flexible supercapacitors.

Application of an ionic-liquid combined with ultrasonic-assisted dispersion ofgold nanoparticles for micro-solid phase extraction of unmetabolized pyridoxine and folic acid in biological fluids prior to high-performance liquid chromatography

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70064-70072 ◽  
Author(s):  
Fahimeh Zare ◽  
Mehrorang Ghaedi ◽  
Ali Daneshfar
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Ionic Liquid ◽  
High Performance ◽  
Solid Phase ◽  
Biological Fluids ◽  
Ultrasonic Waves ◽  
Phase Extraction ◽  
Au Nps ◽  
Ultrasonic Assisted

A facile and efficient protocol was suggested for the synthesis of gold nanoparticles (Au NPs) and their subsequent transfer to aqueous solution using 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, following vigorous shaking with ultrasonic waves.

Recyclable Fe3O4/Au Nanocomposites for Oxidation Degradation of Methylene Blue in Near Neutral Solution

NANO ◽  
2019 ◽  
Vol 14 (10) ◽  
pp. 1950122
Author(s):  
Yan Xing ◽  
Xiao-Hui Bai ◽  
Ming-Li Peng ◽  
Xiang-Rong Ma ◽  
Norbert Buske ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Catalytic Activity ◽  
Rate Constant ◽  
Nanocrystalline Structure ◽  
Neutral Solution ◽  
Au Nps ◽  
Transmission Electron ◽  
Interaction Interface ◽  
Growth Method

Fe3O4/Au nanocomopsites (Fe3O4/Au NPs) with much improved catalytic activity were successfully fabricated through a simple seed growth method in aqueous solution. The petal-like structure, high saturation magnetization, the negatively charged sodium citrate-stabilized Fe3O4/Au NPs was characterized by transmission electron microscopy (TEM), X-ray diffractometer (XRD), dynamic light scattering (DLS) and vibrating sample magnetometry (VSM). The activated-H2O2 ability of Fe3O4/Au NPs was evaluated by using methylene blue (MB) as a cationic phenothiazines dye to be degraded in near neutral solution. The results showed Fe3O4/Au NPs removed over 95% MB from an aqueous solution within 60[Formula: see text]min under the optimum conditions. The apparent rate constant of Fe3O4/Au NPs was [Formula: see text][Formula: see text]min[Formula: see text] which was 43.2 and 8.3 times higher than pure Fe3O4 ([Formula: see text][Formula: see text]min[Formula: see text] and Au ([Formula: see text][Formula: see text]min[Formula: see text] NPs. The enhanced catalytic activity and increased oxidation rate constant probably owing to the synergistic effect between Fe3O4 and Au NPs to activate H2O2 generate a large amount of strong oxidizing species, such as [Formula: see text]. In addition, nanocrystalline structure of Fe3O4/Au NPs was also very important to the peroxidase-like effect, especially the interaction interface between Fe3O4 and Au NPs. Moreover, Fe3O4/Au NPs was stable and could be regenerated and reused for at least five cycles.

scholarly journals Tuning and tracking the growth of gold nanoparticles synthesized using binary surfactant mixtures

2020 ◽  
Vol 2 (5) ◽  
pp. 1980-1992
Author(s):  
Karthik Raghunathan ◽  
Jibin Antony ◽  
Sarmad Munir ◽  
Jens-Petter Andreassen ◽  
Sulalit Bandyopadhyay
Keyword(s):  
Gold Nanoparticles ◽  
Growth Mechanism ◽  
Surfactant Mixtures ◽  
Au Nps ◽  
Synthesis Parameters ◽  
First Time ◽  
Shape Transitions

The effects of synthesis parameters on the shape of gold nanoparticles (Au NPs) and their growth are investigated. A ternary space to study their shape transitions is reported for the first time. A growth mechanism based on supersaturation is proposed.

scholarly journals Microwave-assisted Synthesis of Hexagonal Gold Nanoparticles Reduced by Organosilane (3-Mercaptopropyl)trimethoxysilane

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1680 ◽  
Author(s):  
Kwok Wei Shah ◽  
Long Zheng
Keyword(s):  
Electron Microscopy ◽  
Gold Nanoparticles ◽  
Microwave Irradiation ◽  
Irradiation Time ◽  
Chemical Reduction ◽  
Microwave Assisted Synthesis ◽  
Au Nps ◽  
One Step ◽  
The Impact ◽  
First Time

A novel synthesis of hexagonal gold nanoparticles (Au NPs) via hydrolyzed organosilane (3-mercaptopropyl)trimethoxysilane (MPTMS) using an ultrafast and environmentally friendly method is presented in this study. For the first time, organosilane MPTMS is used for chemical reduction of auric acid under ultrafast microwave irradiation. To the best of our knowledge, the use of organosilane for the synthesis of Au NPs has not been reported. The entire one-step process is convenient, rapid and cost-effective, as well as eco-friendly under alcohol-free aqueous media. Different characterization methods were carried out to investigate the properties of synthesized gold nanoparticles. transmission electron microscopy and scanning electron microscopy were used to investigate the morphology of as-synthesized Au NPs, while X-ray powder diffraction was applied to obtain the crystalline nature. Nuclear magnetic resonance was used to track the hydrolysis of organosilane MPTMS, which is employed for the first time as a reducing agent for the synthesis of Au NPs. The impact from microwave irradiation time and power, as well as the catalytic property of as-synthesized Au NPs, was investigated via ultraviolet–visible spectroscopy. The as-synthesized products include gold nanohexagon and two-dimensional hexagonal gold nanoplatelets, both of which are single-crystal with (1 1 1) planes as basal surfaces. From UV-vis spectra, it is found that the facile water-based fabrication of hexagonal Au NPs began within seconds of microwave irradiation and the size growth increased with the microwave power and time. Moreover, the efficient reduction of 4-nitrophenol to 4-aminophenol in the presence of as-synthesized Au NPs was observed, exhibiting a remarkable catalytic activity. The present simple, rapid and convenient one-step microwave process possess high scalability and useful for future applications such as catalysis, medical, biological, plasmonic sensors and electronics.

scholarly journals Gold Nanoparticles for Drug Delivery and Cancer Therapy

2020 ◽  
Vol 10 (11) ◽  
pp. 3824 ◽  
Author(s):  
Sarkar Siddique ◽  
James C. L. Chow
Keyword(s):  
Drug Delivery ◽  
Gold Nanoparticles ◽  
Cancer Therapy ◽  
Rapid Development ◽  
Disease Diagnosis ◽  
The Novel ◽  
Au Nps ◽  
Functionalized Nanomaterials ◽  
Cancer Agent ◽  
Gold Nanomaterials

Nanomaterials are popularly used in drug delivery, disease diagnosis and therapy. Among a number of functionalized nanomaterials such as carbon nanotubes, peptide nanostructures, liposomes and polymers, gold nanoparticles (Au NPs) make excellent drug and anticancer agent carriers in biomedical and cancer therapy application. Recent advances of synthetic technique improved the surface coating of Au NPs with accurate control of particle size, shape and surface chemistry. These make the gold nanomaterials a much easier and safer cancer agent and drug to be applied to the patient’s tumor. Although many studies on Au NPs have been published, more results are in the pipeline due to the rapid development of nanotechnology. The purpose of this review is to assess how the novel nanomaterials fabricated by Au NPs can impact biomedical applications such as drug delivery and cancer therapy. Moreover, this review explores the viability, property and cytotoxicity of various Au NPs.

scholarly journals Porous Wood Decorated with Gold Nanoparticles as Flow-through Membrane Reactor for Catalytic Hydrogenation of Methylene Blue and 4-Nitrophenol

2021 ◽  
Author(s):  
Yuanyuan Yu ◽  
Qingtong Zhang ◽  
Mingchao Chi ◽  
Hongrui Jiang ◽  
Xi Liu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Catalytic Activity ◽  
Catalytic Hydrogenation ◽  
Organic Contaminants ◽  
Low Cost ◽  
Three Dimensional ◽  
Wood Chip ◽  
Flow Process ◽  
Au Nps

Abstract In this study, gold nanoparticles (Au NPs) were decorated into Paulownia Sieb. et Zucc. chip. Lignin, as one main component of wood, contains the reducing groups e.g. hydroxyl, carbonyl and aldehyde groups. Under sunlight irradiation, Au (III) diffused into wood was in situ reduced by lignin to form gold nanoparticles. Therefore, the Au NPs/Wood was successfully fabricated by this facile and green procedure. Meanwhile, the three-dimensional interpenetrating network of wood prevented the aggregation of Au NPs which retained its catalytic activity. Methylene blue and 4-nitrophenol were adopted as model organic contaminants to evaluate the catalytic hydrogenation ability of the Au NPs/Wood. The analyses of XRD, SEM, ICP-MS and XPS indicated that Au NPs were successfully immobilized in wood chip. The degradation results revealed that the Au NPs/Wood has excellent catalytic activity for methylene blue and 4-nitrophenol hydrogenation under batchwise and continuous flow process. Meanwhile, the Au NPs/Wood also exhibited excellent recyclability. The hydrogenation efficiency of MB and 4-NP still reaches more than 90% after 8 cycles. This study provides a new solution for green and low-cost fabrication of Au NPs/Wood which has broad application prospects in wastewater treatment.

scholarly journals In Situ Reduced MXene/AuNPs Composite Toward Enhanced Charging/discharging and Specific Capacitance

2021 ◽  
Author(s):  
Zixiang Zheng ◽  
Wei Wu ◽  
Tao Yang ◽  
Enhui Wang ◽  
Zhentao Du ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gold Nanoparticles ◽  
Specific Capacitance ◽  
Reduction Reaction ◽  
Cyclic Stability ◽  
Promising Candidate ◽  
Symmetric Supercapacitor ◽  
20 Nm ◽  
First Time

Abstract In this work, gold nanoparticles (AuNPs) decorated Ti3C2Tx nanosheets (MXene/AuNPs composite) are fabricated through a self-reduction reaction of Ti3C2Tx nanosheets with HAuCl4 aqueous solution. The obtained composite is characterized as AuNPs with the diameter of about 20 nm uniformly disperse on Ti3C2Tx nanosheets without aggregation. The composite (MXene decorated on 4.8 wt.% AuNPs) is further employed to construct supercapacitor for the first time with a higher specific capacitance of 278 F g-1 at 5 mV s-1 than that of pure Ti3C2Tx and 95% of cyclic stability after 10000 cycles. Furthermore, MXene/AuNPs composite symmetric supercapacitor with filter paper as separator and H2SO4 as electrolyte, respectively, is assembled. The supercapacitor exhibits a high volumetric energy density of 8.82 Wh L-1 at a power density of 264.6 W L-1 and ultrafast-charging/discharging performance. It exhibits as a promising candidate applied in integrated and flexible supercapacitors.

scholarly journals C–C coupling reactions using a gold(iii) phosphorus complex confined within metal–organic framework fibers in aqueous solution

RSC Advances ◽  
2017 ◽  
Vol 7 (80) ◽  
pp. 50838-50843 ◽  
Author(s):  
Seyed Mohsen Sadeghzadeh ◽  
Rahele Zhiani ◽  
Shokufe Emrani ◽  
Mahdieh Ghabdian
Keyword(s):  
Aqueous Solution ◽  
Methyl Acrylate ◽  
Metal Organic Framework ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Au Nps ◽  
Catalytic Activities ◽  
Metal Organic ◽  
First Time ◽  
Green Conditions

HPG@KCC-1/PPh2/Au NPs were used for the first time as a catalyst for the C–C cross-coupling between allylarenes or methyl acrylate and benzoxazole, and they showed excellent catalytic activities under green conditions.

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