Novel methodology for gold nanoparticles deposition on carbon monolith supports

Ballestero, Diego; Juan, Roberto; Gómez-Giménez, C.; García-Díez, Enrique; Ruiz, Carolina Castillo; Rubio, B.; Izquierdo, M.T.

doi:10.1016/j.colsurfa.2013.08.055

Cited by 7 publications

(9 citation statements)

References 32 publications

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“…The survey scan clearly shows the presence of C, Au, N, Hg, and O (Figure a). The peaks located at around 84.13 and 87.5 eV, corresponding to Au 4f, were allocated to metallic gold (Au 0 ), and the peaks at around 85.7 and 90.01 were assigned to ionic gold (Au + ) (Figure b). , In Figure c, the peaks at 100.9 and 104.2 eV for Hg 4f spectrum corresponded to metallic mercury (Hg 0 ). , These results indicate that the Hg 2+ ions were reduced by AuNCs and formed a Au–Hg amalgam . Therefore, it is predictable here that the amino group containing BSA performs the fluorescence quenching after interaction of Hg 2+ ions with BSA and Hg 2+ ions, binding them tightly to each other.…”

Section: Resultsmentioning

confidence: 78%

“…The peaks located at around 84.13 and 87.5 eV, corresponding to Au 4f, were allocated to metallic gold (Au 0 ), and the peaks at around 85.7 and 90.01 were assigned to ionic gold (Au + ) (Figure 9b). 37,38 In Figure 9c, the peaks at 100.9 and 104.2 eV for Hg 4f spectrum corresponded to metallic mercury (Hg 0 ). 39,40 These results indicate that the Hg 2+ ions were reduced by AuNCs and formed a Au−Hg amalgam.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Photoluminescent AuNCs@UiO-66 for Ultrasensitive Detection of Mercury in Water Samples

2018

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In this work, we synthesized gold nanoclusters within a Zirconium-based metal–organic framework (AuNCs@UiO-66) that may create new prospects for the development of novel sensing materials for biosensor applications. The resulting AuNCs@UiO-66 nanocomposite exhibits red fluorescence with a high quantum yield (11%), and the AuNCs are homogeneously distributed along UiO-66. Analytical and morphological characterizations of the resulting material were carried out by UV–visible spectroscopy, photoluminescence spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and high-resolution transmission electron microscopy. The synthesized AuNCs@UiO-66 nanocomposite was used for the effective detection of Hg 2+ ions with a detection limit as low as 77 pM. Moreover, the fabricated sensors also successfully detected Hg 2+ in real water samples. This sensor is stable and highly fluorescent, developed using a simple fabrication method, and would be constructive for the detection of other metal ions and in biological applications.

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Section: Resultsmentioning

confidence: 78%

Section: ■ Results and Discussionmentioning

confidence: 99%

Photoluminescent AuNCs@UiO-66 for Ultrasensitive Detection of Mercury in Water Samples

2018

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“…The bulk gold content of the sorbent was determined by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Gold nanoparticle size distribution and average particle size were determined by analyzing several images obtained by Scanning Electron Microscopy with Field Emission (FE-SEM), according the procedure given elsewhere [13].…”

Section: Sorbent Preparation and Characterizationmentioning

confidence: 99%

Mercury capture by a structured Au/C regenerable sorbent under oxycoal combustion representative and real conditions

Gómez-Giménez

Izquierdo

Loscertales

et al. 2017

Fuel

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The environmental implications of mercury do not correspond only to the emissions to the atmosphere; the quality of the captured CO 2 to be transported and sequestered has been subject of research, concerning trace quantities of heavy metals participating in mineralization and precipitation reactions in sequestration conditions. For oxycoal combustion, mercury is not an environmental issue alone but also an operational issue, particularly about where mercury could accumulate within the CO 2 processing unit. Therefore, Hg removal is necessary to prevent its attack on the aluminium heat exchangers. In this work, a regenerable sorbent based on carbon supported Au nanoparticles (0.1%wt) has been used for Hg capture under oxycoal combustion atmosphere. The influence of the presence of O 2 , NO, SO 2 and HCl in a gas containing Hg and CO 2 on the sorbent as well as on the Hg oxidation (Au can act as an oxidation catalyst) has been evaluated under a simulated flue gas. The presence of either NO or HCl in the simulated flue gas led to mercury oxidation, with oxidized mercury not evolving in the gas, indicating that it is retained on the sorbent; the oxidized mercury is well stabilized on Au surfaces of the sorbent and favours the Hg-Au amalgam formation. This sorbent has been also evaluated in 3 kWth oxycoal bubling fluidized bed combustor. A lignite with high sulphur content was burned in presence of limestone. Despite high SO 2 concentration that reached the Au/C sorbent, high capture efficiency was achieved and breakthrough occurred after 3.5 h and 10% breakthrough is not reached during the experiments. Bearing in mind that regeneration time can be adjusted near 1 h, two swing sorbent beds could be used to control mercury emissions under oxycoal combustion conditions.

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“…So, it was expected that the increase of salt concentration could enhance ions diffusion. However, some studies suggest that gold particles can be sintered in the early stages by surface diffusion [20] and by grain boundary diffusion [21] and previous research of GNPs deposition on honeycomb carbons structures following similar deposition procedure confirms this trend [13,18].…”

Section: Resultsmentioning

confidence: 78%

“…Different variations of this method include the preadsorption of the reducing agent [11] or the use of microwave assisted deposition [12], among others. Some of these reducing and protective agents are harmful to the environment, so a new method of GNPs preparation based on the reducing ability of carbons can be found in the literature [13,14],…”

Section: Introductionmentioning

confidence: 99%

Influence of crystal/particle size and gold content of a structured Au/C based sorbent on mercury capture

Gómez-Giménez

Ballestero

Ferrer

et al. 2017

Journal of Physics and Chemistry of Solids

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A sorbent based on gold nanoparticles deposited by direct reduction of a gold salt on a structured carbon surface has been prepared to be used in the mercury capture at low concentrations. A total of 13 samples have been obtained varying preparation conditions (stirring rate, gold salt concentration and contact time). A kinetic study of the gold reduction on the carbon surface has been carried out, indicating that the calculated reaction rate constant corresponds to the diffusion rate equation. The study of the influence of gold salt concentration on the reduction potential of the gold showed that the use of a high concentration gold salt solution shifts the reduction reaction to gold reduction. Mercury capture capacity cannot be directly related with either gold content or average particle size or average crystal size, but the study of the grain size distribution can explain the mercury capture performance of the samples.

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Novel methodology for gold nanoparticles deposition on carbon monolith supports

Cited by 7 publications

References 32 publications

Photoluminescent AuNCs@UiO-66 for Ultrasensitive Detection of Mercury in Water Samples

Photoluminescent AuNCs@UiO-66 for Ultrasensitive Detection of Mercury in Water Samples

Mercury capture by a structured Au/C regenerable sorbent under oxycoal combustion representative and real conditions

Influence of crystal/particle size and gold content of a structured Au/C based sorbent on mercury capture

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