Beyond the color: A structural insight to eosin-based lakes

Anselmi, Chiara; Capitani, Donatella; Tintaru, Aura; Doherty, Brenda; Sgamellotti, Antonio; Miliani, Costanza

doi:10.1016/j.dyepig.2017.01.046

Cited by 27 publications

(40 citation statements)

References 32 publications

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“…These characteristic peaks correspond to the composition in Figure 3a and further confirm the inference that SBE and SBE/C are composed of quartz, montmorillonite, etc. The characteristic peaks of Eosin Y at 1,750 cm −1 and 1,330 cm −1 correspond to C=O and C‐O stretching vibrations of the lactone tautomer, respectively (Anselmi et al., 2017). And C‐Br stretching vibration shows peak at 750 cm −1 and 420 cm −1 (Ahmad et al., 2020; Dey & Das, 2019), and the peak at 1,604 cm −1 is attributed to the aromatic skeletal vibrations (Jiang et al., 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Eosin Y is an anionic dye and has two pK a values 4.4 (phenolic groups) and 3.4 (carboxylic groups), which means that when pH < 3.4, it exists in the form of neutral species; when 3.4 < pH < 4.4, it exists in the form of monoanion; and when pH > 4.4, it exists in the form of dianion (Alvarez‐Martin et al., 2017; Anselmi et al., 2017; Greeneltch et al., 2012; Lewandowska‐Andrałojć, Larowska, Gacka, Pedzinski, & Marciniak, 2020). The pH PZC of SBE is 4.7 (Figure 4), and there is electrostatic repulsion between SBE and Eosin Y (dianionic) when the pH > 4.7, which reduced the adsorption capacity of SBE.…”

Section: Resultsmentioning

confidence: 99%

“…This is because the adsorption of Eosin Y on SBE is mainly affected by electrostatic interaction, while the adsorption of SBE/C is affected by electrostatic interactions, hydrogen bonds, hydrophobic effect, halogen bond, and π-π interaction. The reasons for this conclusion are as follows: Eosin Y is an anionic dye and has two pK a values 4.4 (phenolic groups) and 3.4 (carboxylic groups), which means that when pH < 3.4, it exists in the form of neutral species; when 3.4 < pH < 4.4, it exists in the form of monoanion; and when pH > 4.4, it exists in the form of dianion (Alvarez-Martin et al, 2017;Anselmi et al, 2017;Greeneltch et al, 2012;Lewandowska-Andrałojć, Larowska, Gacka, Pedzinski, & Marciniak, 2020). The pH PZC of SBE is 4.7 (Figure 4), and there is electrostatic repulsion between SBE and Eosin Y (dianionic) when the pH > 4.7, which reduced the adsorption capacity of SBE.…”

Section: Research Articlementioning

confidence: 97%

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Adsorption of toxic dye Eosin Y from aqueous solution by clay/carbon composite derived from spent bleaching earth

Liu

Chen

Shi

et al. 2020

Water Environment Research

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The environmentally friendly clay/carbon composite (SBE/C) was prepared by onestep pyrolysis under N 2 atmosphere at 700°C of spent bleaching earth (SBE) from the industrial waste of the refined oil industry. SBE/C was tested to remove anionic dye Eosin Y from aqueous water. The results revealed that SBE/C had larger specific surface area than SBE, and the equilibrium adsorption capacity of SBE/C (11.15 mg/g) was about 3 times than that of SBE (4.04 mg/g). The adsorption process was found to be exothermic and spontaneous. The adsorption capacity of SBE/C was independent on pH (5-12), and exhibits satisfactorily recyclable performance. Combined with characterization analysis, the adsorption mechanism likely includes electrostatic interaction, hydrogen bonding, hydrophobic interaction, halogen bonding, and π-π interaction. Overall, this exploration of SBE/C might open a window to the design of an efficient and low-cost adsorbent for Eosin Y dye elimination from wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Research Articlementioning

confidence: 97%

See 1 more Smart Citation

Adsorption of toxic dye Eosin Y from aqueous solution by clay/carbon composite derived from spent bleaching earth

Liu

Chen

Shi

et al. 2020

Water Environment Research

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“…The first reference panel (Figure A) consisted of paintouts of eosin lake (eosin‐Y complexed with lead, labeled eoPb) mixed with zinc or lead white in varying concentrations. Results with zinc or lead white were similar, and only the lead white results are shown.…”

Section: Resultsmentioning

confidence: 99%

Molecular Fluorescence Imaging Spectroscopy for Mapping Low Concentrations of Red Lake Pigments: Van Gogh's Painting The Olive Orchard

et al. 2020

Self Cite

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Vincent van Gogh used fugitive red lake pigments that have faded in some paintings. Mapping their distribution is key to understanding how his paintings have changed with time. While red lake pigments can be identified from microsamples, in situ identification and mapping remain challenging. This paper explores the ability of molecular fluorescence imaging spectroscopy to identify and, more importantly, map residual non‐degraded red lakes. The high sensitivity of this method enabled identification of the emission spectra of eosin (tetrabromine fluorescein) lake mixed with lead or zinc white at lower concentrations than elemental X‐ray fluorescence (XRF) spectroscopy used on account of bromine. The molecular fluorescence mapping of residual eosin and two carmine red lakes in van Gogh's The Olive Orchard is demonstrated and compared with XRF imaging spectroscopy. The red lakes are consistent with the composition of paint tubes known to have been used by van Gogh.

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“…It belongs to the family of xanthenes and it was first synthetized by Heinrich Caro in 1872 [1]. Besides its application in cosmetics [2–5], cellular staining [6–8] and photovoltaic cells [9], eosin was widely used for painting purposes as a pigment, precipitated with lead and aluminum, and commercialized as “Geranium lake” [10]. Vincent Van Gogh's palette was characterized by the presence of this pigment lake in his production during the Arles period (1888–1890) [11].…”

Section: Introductionmentioning

confidence: 99%

Development of a method based on high‐performance liquid chromatography coupled with diode array, fluorescence, and mass spectrometric detectors for the analysis of eosin at trace levels

Sabatini

Degano

Colombini

2020

Separation Science Plus

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Eosin (Acid Red 87, C.I. 45380) is one of the most brilliant and challenging early synthetic dyes. In this study, an analytical approach based on high‐performance liquid chromatography coupled with diode array and fluorescence detector and high resolution mass spectrometry was developed for testing different analytical columns and acids in the mobile phase. The ultra‐sensitive approach, based on a chromatographic separation on a solid core and a porous shell Poroshell 120 EC‐C18, allowed us to detect and characterize eosin and its synthesis by‐products, such as the debrominated and methyl ester forms of eosin, in trace levels (the limit of detection for eosin is 0.13 ppb). The resulting miscellaneous composition of the eosin standard highlights the importance to determine the exact composition of the starting material to deal with, in order to avoid misinterpretations in aged or degraded samples. Finally, the successful identification of eosin in few grains (approximatively 20 × 40 μm wide) of a faded Van Gogh's painting proved the strengths of our approach.

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Beyond the color: A structural insight to eosin-based lakes

Cited by 27 publications

References 32 publications

Adsorption of toxic dye Eosin Y from aqueous solution by clay/carbon composite derived from spent bleaching earth

Adsorption of toxic dye Eosin Y from aqueous solution by clay/carbon composite derived from spent bleaching earth

Molecular Fluorescence Imaging Spectroscopy for Mapping Low Concentrations of Red Lake Pigments: Van Gogh's Painting The Olive Orchard

Development of a method based on high‐performance liquid chromatography coupled with diode array, fluorescence, and mass spectrometric detectors for the analysis of eosin at trace levels

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