In situ synthesis of gold nanoparticles on N-doped graphene quantum dots for highly efficient catalytic degradation of nitrophenol

Lv, Wenjuan; Ju, Yuyun; Chen, Yonglei; Chen, Xingguo

doi:10.1016/j.ijhydene.2018.04.109

Cited by 22 publications

(8 citation statements)

References 37 publications

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“…The E a and TOF values for the reduction reaction of 4‐NP in the presence of different catalyst systems are given in Table . As seen in Table , the TOF value of Au@Gel for the reduction of 4‐NP is higher than the reported values for ACOS (Ag decorated Co 3 O 4 ), PF‐Ag and AuNPs‐NGQDs …”

Section: Resultsmentioning

confidence: 58%

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A New Approach to Synthesis of Highly Dispersed Gold Nanoparticles via Glucose Oxidase‐Immobilized Hydrogel and Usage in The Reduction of 4‐Nitrophenol

et al. 2020

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In this study, for the first time in the literature, synthesis of Au(0) nanoparticles supported by a crosslinked gel structure was performed via enzyme‐mediated reduction of Au(III) ions without using any chemical reductant. In our newly‐developed method, glucose oxidase enzymes immobilized in the crosslinked gelatine structure ensured simultaneous reduction of the Au(III) ions diffused within the gel to Au(0). The Au@Gel obtained was structurally characterised with TEM (Transmission electron microscopy), EDX (Energy dispersive X‐ray analysis) elemental mapping, XPS (X‐Ray photoelectron spectroscopy) and XRD (X‐Ray Diffraction) analyses. The catalytic activity of Au(0) particles with nearly 8 nm size in the Au@Gel was investigated for the reduction of 4‐nitrophenol (4‐NP) as a model compound in the presence of NaBH4 as reducing agent. The activation parameters for the reduction reaction of 4‐nitrophenol in the presence of Au@Gel catalyst were determined as Ea= 30.16 kJmol−, ΔH#= 27.52 kJmol− and ΔS#= −197.45 Jmol−K−. The Au@Gel catalyst system, with good catalytic activity, simultaneously has nearly perfect reusability.

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Section: Resultsmentioning

confidence: 58%

“…As seen in Table 1, the TOF value of Au@Gel for the reduction of 4-NP is higher than the reported values for ACOS (Ag decorated Co 3 O 4 ), [60] PF-Ag [66] and AuNPs-NGQDs. [68] For the reduction reaction of 4-NP, the activation energy was reported as 31.9 kJmol À for silver nanoparticles supported Ref.…”

mentioning

confidence: 99%

A New Approach to Synthesis of Highly Dispersed Gold Nanoparticles via Glucose Oxidase‐Immobilized Hydrogel and Usage in The Reduction of 4‐Nitrophenol

et al. 2020

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“…In addition, We compared the catalytic activity of the PdTOs with other reported noble metal nanocatalysts . Because the amount of catalyst used in each report was different, it was not appropriate to directly compare the apparent rate constant (K a ).…”

Section: Resultsmentioning

confidence: 99%

Green synthesis of Pd truncated octahedrons using of firmiana simplex leaf extract and their catalytic study for electro‐oxidation of methanol and reduction of p‐nitrophenol

Peng

Bai

Cui

et al. 2019

Applied Organom Chemis

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A facile and eco-friendly biosynthetic route for preparing Pd truncated octahedrons (PdTOs) using firmiana simplex leaf extract was reported without any chemical reducing agents. The information of reducing components, reduction process and time were obtained by ATR-FTIR imaging, FTIR and UV-Vis spectroscopy, respectively. TEM image revealed that more than 75% of PdNPs were composed of PdTOs with an average diameter of 9.2 nm. HR-TEM analysis demonstrated that a single PdTO consisted of the mix of {100} and {111} crystal planes. SAED and XRD pattern confirmed the well crystalline nature of fcc structured PdTOs. The model reactions of electro-oxidation of methanol and reduction of p-nitrophenol (p-NP) were adopted to explore the effects of structure and size of PdNPs on the catalytic properties. In the electro-oxidation of methanol, the forward-scan peak current density (If) of PdTOs was 10.05 mA cm-2, 6.3 times and 1.9 times of PdNPs-0 and PdNPs-4:1, illustrating its superior electro-catalytic property to that of spherical PdNPs. In the p-NP reduction reaction, the apparent rate constant (Ka) over PdTOs was 0.358 min-1, higher than spherical PdNPs-0 (0.08 min-1) with the similar particle size and lower than the same spherical PdNPs-4:1 (0.562 min-1) and commercial Pd/C (0.415 min-1), which all about half the size of PdTOs. It has been demonstrated that electro-chemical oxidation of methanol was a structure-sensitive reaction, while the reduction of p-NP was mainly dependent on the particle size of PdNPs. Highlights• A novel, facile and eco-friendly biosynthetic route for preparing Pd truncated octahedrons (PdTOs) using firmiana simplex leaf extract was reported.• The fcc PdTOs enclosed by a mix of {100} and {111} facets were well crystallized with a purity of more than 75%.• It was found that electro-chemical oxidation of methanol was a structuresensitive reaction, while the reduction efficiency of p-nitrophenol (p-NP) was dependent on the particle size of PdNPs.

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“…Therefore, it is very important to boost the rate-limiting step of Fe 3+ /Fe 2+ conversion to improve the catalytic activity. Graphene quantum dots (GQDs) are new members of the carbon family, 26 which combine the excellent properties of quantum dots and graphene. They have unique characteristics (such as high electron transfer ability, large surface area, good chemical stability, and good biocompatibility), so they have received extensive attention.…”

Section: Introductionmentioning

confidence: 99%

A new FeOCl/graphene quantum dot catalyst for peroxymonosulfate activation to efficiently remove organic pollutants and inactivate Escherichia coli

et al. 2022

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In situ synthesis of gold nanoparticles on N-doped graphene quantum dots for highly efficient catalytic degradation of nitrophenol

Cited by 22 publications

References 37 publications

A New Approach to Synthesis of Highly Dispersed Gold Nanoparticles via Glucose Oxidase‐Immobilized Hydrogel and Usage in The Reduction of 4‐Nitrophenol

A New Approach to Synthesis of Highly Dispersed Gold Nanoparticles via Glucose Oxidase‐Immobilized Hydrogel and Usage in The Reduction of 4‐Nitrophenol

Green synthesis of Pd truncated octahedrons using of firmiana simplex leaf extract and their catalytic study for electro‐oxidation of methanol and reduction of p‐nitrophenol

A new FeOCl/graphene quantum dot catalyst for peroxymonosulfate activation to efficiently remove organic pollutants and inactivate Escherichia coli

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