The Decoration of Gold Core in Au@ZrO2 Nanoreactors with Trace Amounts of Pd for the Effective Reduction of 4-Nitrophenol to 4-Aminophenol

Acosta, Brenda; Evangelista, Viridiana; Miridonov, Serguei V.; Fuentes, S.; Simakov, Andrey

doi:10.1007/s10562-019-02758-y

Cited by 18 publications

(10 citation statements)

References 54 publications

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“…In recent years, great efforts have been devoted to fabricating various temperature-sensitive hydrogel materials due to their potential application in medicinal chemistry as well as in catalysis for a large number of reactions. − The fabrication of a temperature-sensitive hydrogel (nanoreactor) is mainly achieved by using a suitable hydrophilic template. , Recently, poly( N -isopropylacrylamide) was extensively used to prepare such kind of novel ″smart″ materials that exhibit volume phase transition in response to environmental stimuli, like temperature, pH, etc., by utilizing its semi-interpenetrating polymeric networks . Although PVA possesses the same type of polymeric networks, the fabrication of thermosensitive hydrogels is very rare.…”

Section: Introductionmentioning

confidence: 99%

Size-Dependent Catalytic Activity of PVA-Stabilized Palladium Nanoparticles in p-Nitrophenol Reduction: Using a Thermoresponsive Nanoreactor

Chatterjee

Bhattacharya

2021

ACS Omega

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Palladium nanoparticles (Pd NPs) of various average global diameters (2.1−7.1 nm) encapsulated with hydrophilic polymer polyvinyl alcohol (PVA) have been synthesized and used as catalysts for sodium borohydride assisted reduction of p-nitrophenol to p-aminophenol. The synthesized catalysts exhibit excellent and typical size-dependent catalytic activity in the green protocol. UV−visible absorption spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy were employed to characterize the prepared Pd NPs. The kinetics of this reaction was easily monitored by a UV−visible absorption spectrophotometer. The mechanism of the reaction is explained by the Langmuir−Hinshelwood model. The catalytic performance increases with decreasing size of the synthesized nanoparticles. The apparent rate constants (k app × 10 3 /s −1 ) of the catalytic reduction in the presence of Pd NPs of average diameters of 2.1, 3.35, 6.2, and 7.1 nm are determined as 8.57, 7.67, 6.16, and 5.04, respectively, at 298 K by using 2.91 mol % palladium nanocatalyst in each case. Moreover, the estimated activation energy of 22.2 kJ mol −1 obtained for Pd NPs with the smallest average diameter of 2.1 nm is very low as reported in the literature for the reduction. The influences of catalyst dose and concentration of p-nitrophenol on catalytic reduction are fully investigated. The catalyst with the largest diameter shows a temperature-sensitive property that might be due to the presence of a very low amount of rapped PVA used as stabilizer during the fabrication process. Thus, the synthetic protocol provides a unique fabrication process of a catalytically active thermoresponsive nanoreactor consisting of Pd NPs encapsulated into a PVA stabilizing agent.

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Section: Introductionmentioning

confidence: 99%

Size-Dependent Catalytic Activity of PVA-Stabilized Palladium Nanoparticles in p-Nitrophenol Reduction: Using a Thermoresponsive Nanoreactor

Chatterjee

Bhattacharya

2021

ACS Omega

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“…The nanocomposites containing AuNPs [49] or both Au and PdNPs [46] were used as heterogeneous nanocatalysts for the catalytic decomposition of 4-nitrophenol (4-NF) to 4-aminophenol (4-AF). As compared to the other studies [50][51][52][53][54][55][56], the designed catalysts led to the complete decomposition of 4-NF, and what is more, their physical form (suspension copolymers of grain diameter 0.6 mm) allowed their convenient and multiple reuse, without any additional treatment [46,49]. Because within the research project, a second type of nanocatalysts for decomposition of 4-NP was designed, the NCs for applications in catalysis are summarized and compared to the literature further in the text (please refer to Table 4).…”

Section: In Situ Synthesis Approachmentioning

confidence: 74%

A Mini-Review on Anion Exchange and Chelating Polymers for Applications in Hydrometallurgy, Environmental Protection, and Biomedicine

Cyganowski

Dzimitrowicz

2020

Polymers

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The rapidly increasing demand for technologies aiming to resolve challenges of separations and environmental protection causes a sharp increase in the demand for ion exchange (IX) and chelating polymers. These unique materials can offer target-selective adsorption properties vital for the removal or recovery of harmful and precious materials, where trace concentrations thereof make other techniques insufficient. Hence, recent achievements in syntheses of IX and chelating resins designed and developed in our research group are discussed within this mini-review. The aim of the present work is to reveal that, due to the diversified and unique physiochemical characteristics of the proposed materials, they are not limited to traditional separation techniques and could be used in multifunctional areas of applications, including catalysis, heat management, and biomedicine.

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“…The composite was prepared using a distinct ratio of Au:Pd. Although, the as-prepared catalyst demonstrated superior catalytic activity and strong stability towards the reduction of 4-nitrophenol, however, the catalyst was prepared by a complicated process which requires several steps [41]. However, in this study, smaller sizes Au NPs are uniformly distributed on the ZrO 2 surface in a single step which enhanced the catalytic properties of the resulting composite.…”

Section: Catalytic Properties Of Au-zromentioning

confidence: 84%

Facile Sonochemical Preparation of Au-ZrO2 Nanocatalyst for the Catalytic Reduction of 4-Nitrophenol

et al. 2020

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High-intensity ultrasonic waves have great potential for the green synthesis of various nanomaterials under mild conditions and offer an excellent alternative for hazardous chemical methods. Herein a facile approach for the eco-friendly synthesis of Au-ZrO2 nanocatalyst with a high catalytic activity using a facile ultrasonic method is presented. Gold (Au) in the nanosize regime was successfully deposited on the surface of solvothermally synthesized monodispersed ZrO2 nanoparticles (ZrO2 NPs) in a very short period of time (5 min) at room temperature. Spherical shape small size Au nanoparticles that are uniformly dispersed on the surface of ZrO2 nanoparticles were obtained. Notably, in the absence of ZrO2 nanoparticles, HAuCl4 could not be reduced, indicating that nano-sized ZrO2 not only acted as support but also helped to reduce the gold precursor at the surface. The as-prepared Au-ZrO2 nanocatalyst was characterized by various techniques. The Au-ZrO2 nanocatalyst served as a highly efficient reducing catalyst for the reduction of 4-nitrophenol. The reaction time decreased with increasing the amount of catalyst.

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The Decoration of Gold Core in Au@ZrO2 Nanoreactors with Trace Amounts of Pd for the Effective Reduction of 4-Nitrophenol to 4-Aminophenol

Cited by 18 publications

References 54 publications

Size-Dependent Catalytic Activity of PVA-Stabilized Palladium Nanoparticles in p-Nitrophenol Reduction: Using a Thermoresponsive Nanoreactor

Size-Dependent Catalytic Activity of PVA-Stabilized Palladium Nanoparticles in p-Nitrophenol Reduction: Using a Thermoresponsive Nanoreactor

A Mini-Review on Anion Exchange and Chelating Polymers for Applications in Hydrometallurgy, Environmental Protection, and Biomedicine

Facile Sonochemical Preparation of Au-ZrO2 Nanocatalyst for the Catalytic Reduction of 4-Nitrophenol

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