Colored Sodalite and A Zeolites

Loera, Sandra; Ibarra, Ilich A.; Laguna, Humberto G.; Lima, Enrique; Bosch, P.; Lara, V.H.; Haro‐Poniatowski, E.

doi:10.1021/ie060656m

Cited by 18 publications

(20 citation statements)

References 23 publications

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“…In addition, bands assigned to elemental sulfur and to chromophores S 6 2− and S 3 − are also present. The yellow colour in zeolitic pigments is attributed to three main agents: S 2 − (Kowalak & Jankowska, 2003), elemental sulfur (Loera et al, 2006), and S 6 2− (Gobeltz et al, 2011). The spectra of yellow grains (Fig.…”

Section: Fig 4 Raman Spectra Of the Blue Grains Of Pigments P1-k Anmentioning

confidence: 98%

“…The main mineral present in lapis lazuli is lazurite, a tectosilicate which can also be considered as a zeolite structure. Lazurite was considered to be of great importance in the Middle Ages; it was applied, as a powder, in the preparation of valuable pigments used in ornaments, pharaonic pieces and cathedral coatings (Loera et al, 2006). Large extraction and logistical costs prompted the search for synthetic pigments which were similar to lazurite (Tarling et al, 1988).…”

mentioning

confidence: 99%

“…Sodium polysulfides, which are generally used in the synthesis of ultramarine pigments, are usually obtained from the reaction between sulfur and sodium carbonate. The molar proportion of these two reactants (S/Na 2 CO 3 ) affects the formation of chromophores which, in turn, determines the colour and hue of the pigment (Loera et al, 2006). Among the possible reactions forming sodium polysulfides, sodium tetrasulfide (Na 2 S 4 ) and sodium thiosulfate (Na 2 S 2 O 3 ) are favoured during calcination at <550°C (equation 1) (Gobeltz et al, 1998a).…”

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Synthesis of ultramarine pigments from Na-A zeolite derived from kaolin waste from the Amazon

et al. 2017

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Ultramarine pigments were synthesized successfully from Na-A zeolite derived from kaolin waste. Na-A zeolite encapsulates the sulfur species formed and which act as chromophores, which circumvents their oxidation and the subsequent liberation of high levels of toxic gases during the reaction. Different Na-A zeolite matrices with various grain sizes (fine to coarse) were mixed with sulfur and sodium carbonate in various proportions to study the influence of these variables on the pigments’ colours and hues. After calcination at 500°C for 5 h, the products were characterized by X-ray diffraction, X-ray fluorescence and Raman spectroscopy and were classified by the Munsell system (colour and hue). Products with colour ranging from blue to green with various hues were obtained. Both colour and hue were affected by the amount of additives and by the particle size.

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Section: Fig 4 Raman Spectra Of the Blue Grains Of Pigments P1-k Anmentioning

confidence: 98%

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confidence: 99%

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confidence: 99%

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Synthesis of ultramarine pigments from Na-A zeolite derived from kaolin waste from the Amazon

et al. 2017

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“…Proportions of 20 24,25 , 40 21,22 , or 60 % 17 sulfur relative to the mass of zeolite are commonly used, and the S/Na 2 CO 3 ratio is defined by considering that an excess of sodium carbonate favors the formation of S -3 and an excess of sulfur favors the formation of S -2 . Given this background on the subject, the objective of this study was to obtain ultramarine pigments from zeolite A derived from kaolin waste in the Amazon region and determine the influence of the reagent concentrations and cooling rates after calcination on the color and shade of the final product.…”

Section: Introductionmentioning

confidence: 99%

Color and shade parameters of ultramarine zeolitic pigments synthesized from kaolin waste

et al. 2014

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Ultramarine pigments were successful synthesized from zeolite A obtained from kaolin waste. This waste has been used as an excellent source of silicon and aluminum for zeolite synthesis because of its high kaolinite concentrations and low contents of other accessory minerals. The cost is naturally less than the industrialized product. Color additives (Sulfur and Sodium Carbonate) were mixed with different proportions of zeolite A and further calcined for 5 h at 500 °C. They were characterized by XRD and XRF in addition to visual classification by color and shade. These products show colors from blue to green at different shades, both influenced by the amount of additives and cooling rate after calcination. Thus, a different quantity of the same additives in the same zeolitic matrix provides an increase in the color intensity. Cooling rate after calcination induces the color change which is substantially important in the pigments production.

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“…), 5 -9 ultramarine pigments (UP), 3,10 -13 and pigments of the zeolite 4A structure. 14,15 This radical is well identified for more than 30 years 16 by its electronic absorption band located at ca 610 nm, its ESR spectrum and its vibrational spectrum. This radical was first identified in alkali halide crystals doped with sulfur by using ESR 1 and ENDOR techniques 2 .…”

Section: Introductionmentioning

confidence: 99%

Observation of the ν₃ Raman band of S₃⁻ inserted into sodalite cages

Ledé¹,

Demortier

Gobeltz-Hautecoeur³

et al. 2007

J Raman Spectroscopy

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The S 3− radical anion is observed in several systems: non-aqueous polysulfides solutions, doped alkali halides, ultramarine pigments (UP) for which S 3 − is the blue chromophore and S 2 − is the yellow one and pigments of zeolite 4A structure. The S 3 − ion has C 2V symmetry, and therefore its three vibrational modes should be observed in the Raman and in IR spectra. In resonance Raman spectroscopy, only the symmetric stretching mode n 1 and the bending mode n 2 have been observed, whereas the anti-symmetric stretching mode n 3 has never been observed whatever the system. In this work, we confirm that n 3 is not observed in solutions with resonance Raman spectroscopy. However, our investigation of several blue UP, with various concentrations of S 2 − , shows that there is a superposition of two bands at ca 590 cm −1 : the first is assigned to n (S 2 − ) and the second to n 3 (S 3 − ). With the 457.9 nm excitation line, for which the resonance conditions are simultaneously fulfilled for S 2 − and S 3 − , the band at ca 590 cm −1 is the sum of the contributions of both n (S 2 − ) and n 3 (S 3 − ) vibrations, while, with the 647.1 nm line, which only satisfies the resonance conditions of S 3 − , the band at ca 584 cm −1 must be assigned only to n 3 (S 3 − ). Furthermore, n 3 (S 3 − ) is observed in green UP and in pigments of zeolite structure. The n 3 vibration of S 3 − , which is observed neither in polysulfide solutions nor in doped alkali halides in resonance Raman conditions, can therefore be observed when this species is inserted into the b-cages of the sodalite or of the zeolite 4A structures. So, the band at ca 590 cm −1 cannot always be assigned to S 2 − in these systems. This implies that the concentration of S 2 − in UP must be reconsidered.Raman spectra were recorded at room temperature with an RT30 Dilor spectrometer (for 457.9; 530.8 and 647.1 nm DISCUSSIONThe above results show that the Raman band associated with the 3 anti-symmetric stretching mode of S 3 is observed in

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Colored Sodalite and A Zeolites

Cited by 18 publications

References 23 publications

Synthesis of ultramarine pigments from Na-A zeolite derived from kaolin waste from the Amazon

Synthesis of ultramarine pigments from Na-A zeolite derived from kaolin waste from the Amazon

Color and shade parameters of ultramarine zeolitic pigments synthesized from kaolin waste

Observation of the ν₃ Raman band of S₃⁻ inserted into sodalite cages

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Colored Sodalite and A Zeolites

Cited by 18 publications

References 23 publications

Synthesis of ultramarine pigments from Na-A zeolite derived from kaolin waste from the Amazon

Synthesis of ultramarine pigments from Na-A zeolite derived from kaolin waste from the Amazon

Color and shade parameters of ultramarine zeolitic pigments synthesized from kaolin waste

Observation of the ν3 Raman band of S3− inserted into sodalite cages

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Observation of the ν₃ Raman band of S₃⁻ inserted into sodalite cages