Simple preparation Au/Pd core/shell nanoparticles for 4-nitrophenol reduction

Srisombat, Laongnuan; Nonkumwong, Jeeranan; Suwannarat, Kwanjira; Kuntalue, Budsabong; Ananta, Supon

doi:10.1016/j.colsurfa.2016.10.026

Cited by 45 publications

(22 citation statements)

References 57 publications

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“…Both Au and Pd elements were able to be detected in the three nanoflower samples, and the mass ratio of Au to Pd is 18:1, 17.6:1, 3.5:1 in Au-Pd NFs (Au core), Au-Pd NFs (Au 1 Pd 1 core) and Au@Pd NFs, respectively. The synthesized nanoparticles were also characterized by UV-vis spectroscopy as supplement technique, surface plasmon resonance (SPR) peaks of Au-Pd NFs (Au core), Au-Pd NFs (Au 1 Pd 1 core) and Au@Pd NFs were able to be detected at 633 nm, 685 nm and 695 nm, respectively ( Figure 2 ), which is reasonable for Au-Pd bimetallic nanoparticles [ 25 ].…”

Section: Resultsmentioning

confidence: 89%

Synthesis of Au-Pd Bimetallic Nanoflowers for Catalytic Reduction of 4-Nitrophenol

Liang

Chen

et al. 2017

Nanomaterials

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Due to the great potential to improve catalytic performance, gold (Au) and palladium (Pd) bimetallic catalysts have prompted structure-controlled synthesis of Au-Pd nanoalloys bounded by high-index facets. In this work, we prepared Au-Pd bimetallic nanoflowers (NFs) with a uniform size, well-defined dendritic morphology, and homogeneous alloy structure in an aqueous solution by seed-mediated synthesis. The prepared bimetallic NFs were fully characterized using a combination of transmission electron microscopy, Ultraviolet-Visible (UV-vis) spectroscopy, inductively coupled plasma optical emission spectroscopy, and cyclic voltammetry measurements. The catalytic activities of the prepared Au-Pd nanoparticles for 4-nitrophenol reduction were also investigated, and the activities are in the order of Au@Pd NFs > Au-Pd NFs (Au1Pd1 core) > Au-Pd NFs (Au core), which could be related to the content and exposed different reactive surfaces of Pd in alloys. This result clearly demonstrates that the superior activities of Au-Pd alloy nanodendrites could be attributed to the synergy between Au and Pd in catalysts.

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Section: Resultsmentioning

confidence: 89%

Synthesis of Au-Pd Bimetallic Nanoflowers for Catalytic Reduction of 4-Nitrophenol

Liang

Chen

et al. 2017

Nanomaterials

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“…In order to thoroughly compare the catalytic efficiency of Pal-NH 2 @Au 48 Pd 52 nano-catalysts with other examples in the literature, we also calculated the TON and TOF values. As shown in Table 2, it was worth noting that the K , TON and TOF values of Pal-NH 2 @Au 48 Pd 52 were higher than for many other nano-catalysts [44,45,46,47].…”

Section: Resultsmentioning

confidence: 93%

“…In order to compare our results with other reports, we also listed the ratio of apparent rate constants ( k app ) over the molar ratio of AuPd catalysts and the concentration of 4-NP, named activity factor K , summarized in Table 2. It is worth noting that the activity factor K value of Pal-NH 2 @Au 48 Pd 52 was 552.7 times higher than in Au 1 Pd 4 core-shell nano-catalysts [46] and 5.6–116.2 times higher than in other reported 4-NP catalytic reactions [47,48,49]. In fact, in our catalytic system, each catalyst could achieve nearly 99% conversion of the substrates, so the ratio of Au-Pd alloy NPs ( n Au + n Pd ) and 4-NP ( n 4-NP ) is 1/TON (where TON represents turnover number).…”

Section: Resultsmentioning

confidence: 99%

Palygorskite Supported AuPd Alloy Nanoparticles as Efficient Nano-Catalysts for the Reduction of Nitroarenes and Dyes at Room Temperature

Guo

Jia

et al. 2018

Nanomaterials

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In this work, AuPd alloy palygorskite based Pal-NH2@AuPd nano-catalysts were prepared and used as catalysts for the reduction of nitroarenes and dyes at room temperature. The surface of palygorskite (Pal) was first modified with 3-aminpropyltriethoxysilane, and then covered with AuPd alloy nanoparticles through co-reduction of HAuCl4 and K2PdCl4. The morphology and structures of the Pal-NH2@AuPd nano-catalysts were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS) and transmission electron microscopy (TEM). The as-synthesized Pal-NH2@AuPd nano-catalysts displayed excellent catalytic performance in reducing 4-nitrophenol (4-NP) and various other nitroaromatic compounds. Moreover, the catalytic activities of the Pal-NH2@AuPd nano-catalysts were adjustable via changing the atomic ratio of AuPd alloy nanoparticles, leading to the Pal-NH2@Au48Pd52 component as having the best atomic ratio. The Pal-NH2@Au48Pd52 continued to display good catalytic stability after being reused for several cycles and there were no obvious changes, either of the morphology or the particle size distribution of the nano-catalysts. Furthermore, these Pal-NH2@Au48Pd52 nano-catalysts also provided a convenient and accessible way for the degradation of dyes in artificial industrial wastewater.

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“…In the absence of PdNPs catalyst, the UV–Vis peak of p‐NP at 400 nm did not decrease at all after 40 mins of reaction (Figure a), indicating no reduction occurred. After addition of PdTOs, as shown in Figure b, the decrease in absorbance at 400 nm showed the reduction of p‐NP to p‐AP, with the new absorbance appeared at 300 nm corresponded to p‐AP . Though the PdTOs added was only 12.5% of the amount of substance of p‐NP, the catalytic reaction was completed within 12 minutes, indicating its high catalytic efficiency.…”

Section: Resultsmentioning

confidence: 93%

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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Simple preparation Au/Pd core/shell nanoparticles for 4-nitrophenol reduction

Cited by 45 publications

References 57 publications

Synthesis of Au-Pd Bimetallic Nanoflowers for Catalytic Reduction of 4-Nitrophenol

Synthesis of Au-Pd Bimetallic Nanoflowers for Catalytic Reduction of 4-Nitrophenol

Palygorskite Supported AuPd Alloy Nanoparticles as Efficient Nano-Catalysts for the Reduction of Nitroarenes and Dyes at Room Temperature

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

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