Strategy to isolate ionic gold sites on silica surface: Increasing their efficiency as catalyst for the formation of 1,3-diynes

Didó, Cezar A.; Coelho, Felipe Lange; Closs, Maurício B.; Deon, Marion; Horowitz, Flávio; Bernardi, Fabiano; Schneider, Paulo H.; Benvenutti, Edílson V.

doi:10.1016/j.apcata.2020.117444

Cited by 6 publications

(4 citation statements)

References 45 publications

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“…Interestingly the catalytic performance (in terms of TOF) of the Au NPs@CrADC capillary is superior to those of a number of reported catalysts on the oxidative coupling reaction of alkynes (Table 2). [44,[58][59][60][61][62][63][64] Additionally, among the reported catalysts higher temperature (70°C-170°C) [58,60,[62][63][64] and/or longer reaction time (12 h-20 h) [44,[58][59][60][61][62]64] are required.…”

Section: Full Papermentioning

confidence: 99%

Supported Metal Nanoparticles in Metal‐Organic Monoliths for Assembly of a Catalytic Microfluidic Reactor

Chen

et al. 2021

ChemNanoMat

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A novel strategy has been developed to fabricate an Au@CrADC (ADC=5‐aminobenzene‐1,3‐dicarboxylate) metal‐organic monolithic capillary in microfluidic reactors. Monolithic Cr3+‐based metal‐organic gel (MOG) as catalyst support is synthesized inside fused‐silica capillary employing a two‐step procedure including surface modification of carboxyl group to provide anchoring sites and subsequent MOG formation. Subsequently, Au nanoparticles are in situ immobilized in the monolithic MOG support as active catalysts. The resulting Au@CrADC monolithic capillary is used to assemble a catalytic microfluidic reactor. The catalytic activity of the Au@CrADC reactor is probed by using the oxidative alkyne coupling reaction to synthesize 1,3‐diynes. The catalytic microfluidic reactor demonstrates significantly enhanced catalytic activity in comparison with the corresponding reactions under batch conditions. Additionally, the microfluidic reactor shows high stability with no significant catalytic deactivation during repeated uses.

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Section: Full Papermentioning

confidence: 99%

Supported Metal Nanoparticles in Metal‐Organic Monoliths for Assembly of a Catalytic Microfluidic Reactor

Chen

et al. 2021

ChemNanoMat

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“…In spite of very good activity of metal oxide nanoparticles under UV light irradiation, the wide‐bandgap and prompt recombination of photogenerated charges reduce the efficiency under sunlight (Cuerda‐Correa et al, 2020). Among the photocatalyst, silica has received considerable attention for its properties, such as easily synthesized by sol–gel process, high stability, nontoxic, biocompatibility, large surface area, mesoporous texture, and adjustable nano pore size (Bagheri et al, 2020; Didó et al, 2020; Made Joni et al, 2019; Narayan et al, 2018; Nemiwal & Kumar, 2021; Oh et al, 2019). Among the mentioned characteristics, the porosity nature of silica ensures the enhancement of contaminant adsorption on the catalyst surface thereby increasing the water decontamination efficiency (Cui et al, 2017, Jain, Dhali, et al, 2022, Malik et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the antimicrobial photocatalytic activities of SiO₂ and Au@SiO₂ nanostructures in water decontamination

Alizadeh,

Dorranian,

Sari

2023

Microscopy Res & Technique

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Photocatalytic disinfection of Escherichia coli suspension by silicon dioxide nanoparticles and silicon dioxide/gold nanocomposite in a batch reactor is investigated experimentally and results are compared. Silica nanoparticles were synthesized by Stöber method and pulsed laser ablation method was employed to prepare gold nanoparticles in distilled water. Composition of two nanoparticles species was carried out, using the second harmonic pulse of Nd:YAG laser, whose wavelength is in the absorption spectra of gold nanoparticles. Results confirm a decrease in the bandgap energy of silica nanoparticles after composition. Escherichia coli were selected as an indicator of the microbial water contamination. Disk diffusion method was used to evaluate the antimicrobial potential of SiO2 and Au@SiO2 nanostructures. Photocatalytic activities of both nanostructures were examined in dark, and under the irradiation of UV and visible light. In all conditions, the performance of Au@SiO2 nanocomposites was higher than SiO2 nanoparticles. In dark condition the higher biocidal nature and activity of Au nanoparticles and for the case of UV radiation, decreasing the bandgap energy and recombination rate of SiO2 nanoparticles after composition with Au increased the efficiency. For the case of visible light radiation, surface plasmon resonances effects, and local heat of Au nanoparticles were responsible for increasing the efficiency.Research Highlights Doping large bandgap semiconductors nanostructures, such as silica with metal nanoparticles, such as gold will improve their photocatalytic activity to work in visible light. In this mechanism, gold nanoparticles act as effective traps to prevent the recombination of photogenerated electron–hole pairs. Other mechanisms, such as Schottky barrier formation, surface plasmon resonance absorption of gold nanoparticles, and biocidal nature of the gold nanoparticles are effective in increasing the efficiency of Au doped silica nanostructures.

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“…Silica hybrid gels are among the so-called organic modified silica (ORMOSILs). Nowadays, these materials are being used for multiple applications such as the adsorption of metals in water [ 1 , 2 , 3 ], catalyst support [ 4 , 5 , 6 ], support for luminescent compounds [ 7 , 8 , 9 ], anti-corrosive or fungicide coatings [ 10 , 11 , 12 , 13 ], and biomedicine [ 14 , 15 , 16 , 17 , 18 , 19 ]. The key behind the tunability of the properties of these materials is the synergetic effect that generates the coexistence, at a nanometric scale, of an inorganic skeleton with flexible and functional organic constituents [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

“…The key behind the tunability of the properties of these materials is the synergetic effect that generates the coexistence, at a nanometric scale, of an inorganic skeleton with flexible and functional organic constituents [ 20 , 21 ]. The hybrid gels are prepared by the sol-gel method, a very versatile synthetic technique that allows different approaches: (i) Anchoring of organic molecules in the porous of the already-formed solid gel [ 1 , 2 , 7 , 8 , 9 ], (ii) grafting of organic moieties on the surface of a silica material [ 4 , 22 , 23 ], (iii) co-condensation of an organosilane (SiR x (OR’) 4−x ), with a carbon precursor, to form Si-O-C xerogels [ 16 , 18 , 24 , 25 ], or finally, (iv) classic co-condensation of a tetraalkoxysilane (Si(OR) 4 ), usually tetraethoxysilane (TEOS), with one or more organosilanes [ 8 , 9 , 10 ]. In the latter approach, to obtain materials with the desired properties, it is of paramount importance to control the precursors’ hydrolysis and condensation reactions ( Figure 1 ), due to their susceptibility to the media conditions (pH, solvents, use or not of a catalyst, proportions of H 2 O/precursor or organosilane/tetra alkoxysilane) [ 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Novel Silica Hybrid Xerogels Prepared by Co-Condensation of TEOS and ClPhTEOS: A Chemical and Morphological Study

Cruz-Quesada

Espinal‐Viguri²,

López-Ramón³

et al. 2022

Gels

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The search for new materials with improved properties for advanced applications is, nowadays, one of the most relevant and booming fields for scientists due to the environmental and technological needs of our society. Within this demand, hybrid siliceous materials, made out of organic and inorganic species (ORMOSILs), have emerged as an alternative with endless chemical and textural possibilities by incorporating in their structure the properties of inorganic compounds (i.e., mechanical, thermal, and structural stability) in synergy with those of organic compounds (functionality and flexibility), and thus, bestowing the material with unique properties, which allow access to multiple applications. In this work, synthesis using the sol-gel method of a series of new hybrid materials prepared by the co-condensation of tetraethoxysilane (TEOS) and 4-chlorophenyltriethoxysilane (ClPhTEOS) in different molar ratios is described. The aim of the study is not only the preparation of new materials but also their characterization by means of different techniques (FT-IR, 29Si NMR, X-ray Diffraction, and N2/CO2 adsorption, among others) to obtain information on their chemical behavior and porous structure. Understanding how the chemical and textural properties of these materials are modulated with respect to the molar percentage of organic precursor will help to envisage their possible applications: From the most conventional such as catalysis, adsorption, or separation, to the most advanced in nanotechnology such as microelectronics, photoluminescence, non-linear optics, or sensorics.

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Strategy to isolate ionic gold sites on silica surface: Increasing their efficiency as catalyst for the formation of 1,3-diynes

Cited by 6 publications

References 45 publications

Supported Metal Nanoparticles in Metal‐Organic Monoliths for Assembly of a Catalytic Microfluidic Reactor

Supported Metal Nanoparticles in Metal‐Organic Monoliths for Assembly of a Catalytic Microfluidic Reactor

Comparison of the antimicrobial photocatalytic activities of SiO₂ and Au@SiO₂ nanostructures in water decontamination

Novel Silica Hybrid Xerogels Prepared by Co-Condensation of TEOS and ClPhTEOS: A Chemical and Morphological Study

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Strategy to isolate ionic gold sites on silica surface: Increasing their efficiency as catalyst for the formation of 1,3-diynes

Cited by 6 publications

References 45 publications

Supported Metal Nanoparticles in Metal‐Organic Monoliths for Assembly of a Catalytic Microfluidic Reactor

Supported Metal Nanoparticles in Metal‐Organic Monoliths for Assembly of a Catalytic Microfluidic Reactor

Comparison of the antimicrobial photocatalytic activities of SiO2 and Au@SiO2 nanostructures in water decontamination

Novel Silica Hybrid Xerogels Prepared by Co-Condensation of TEOS and ClPhTEOS: A Chemical and Morphological Study

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Comparison of the antimicrobial photocatalytic activities of SiO₂ and Au@SiO₂ nanostructures in water decontamination