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decolorization

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Journal Article
Published: 01 June 2003
Clays and Clay Minerals (2003) 51 (3): 327–333.
...George E. Christidis; Sotiria Kosiari Abstract The mechanism of decolorization of crude maize and sunflower oils was studied by means of adsorption of β-carotene by a low-grade bentonite, containing mixed-layered illite-smectite. Decolorization depends on temperature and the time required...
FIGURES | View All (4)
Journal Article
Published: 01 June 2015
Italian Journal of Geosciences (2015) 134 (2): 266–290.
FIGURES | View All (15)
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The effect of solution pH on (a) MB and (b) AF <b>decolorization</b> rate. Experim...
Published: 01 December 2016
Figure 8. The effect of solution pH on (a) MB and (b) AF decolorization rate. Experiment conditions: 0.10 g of the NaOH-modified fly ash (modified with 6 mol/L NaOH), pH = 2, 30°C, 50 mL volume, and 30 mg/L initial MB or AF concentration.
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The effect of solution temperature on (a) MB and (b) AF <b>decolorization</b> rate...
Published: 01 December 2016
Figure 9. The effect of solution temperature on (a) MB and (b) AF decolorization rate. Experiment conditions: 0.10 g of NaOH-modified fly ash (modified with 6 mol/L NaOH), pH = 2, 50 mL volume, and 30 mg/L of initial MB or AF concentration.
Image
The effect of initial solution concentration on the <b>decolorization</b> rate of ...
Published: 01 December 2016
Figure 10. The effect of initial solution concentration on the decolorization rate of (a) MB and (b) AF. Experiment conditions: 0.10 g of NaOH-modified fly ash (modified with 6 mol/L NaOH), pH = 2, 50 mL solution volume, and 30°C.
Journal Article
Published: 01 October 2008
Russ. Geol. Geophys. (2008) 49 (10): 738–742.
... apparatus BARS with a solid-phase refractory oxide cell at 5.0 GPa and 1000–1600 °C. In the temperature range from 1350 to 1450 °C, the crack rosettes around sulfide inclusions in diamond crystals were decolorized but the position of inclusions in diamond crystals did not change. The “decolorization” seems...
FIGURES
Journal Article
Published: 01 August 1988
American Mineralogist (1988) 73 (7-8): 822–825.
... that natural samples should have experienced over geologic time. These doses generally correspond to the doses required to restore the color to elbaites that have been decolorized by laboratory heat treatment, indicating that color in naturally pink tourmaline is a product of natural radiation. This radiation...
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<b>Decoloration</b> of X-GN through different processes: (a) FeAl-Mt&#x2F;H 2 O 2 &#x2F;visi...
Published: 01 October 2011
Figure 6. Decoloration of X-GN through different processes: (a) FeAl-Mt/H 2 O 2 /visible light, (b) FeAl-Mt/H 2 O 2 , (c) FeAl- Mt/visible light, and (d) H 2 O 2 /visible light. [X-GN] 0 = 100 mg L −1 , pH = 3.0, FeAl 0.8 -Mt = 0.4 g L − 1 , T = 30ºC, [H 2 O 2 ] 0 = 3.92 mmol L −. 1 Error
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Three diamonds (4.11-5.34 carats) <b>decolorized</b> by the HPHT-annealing process...
in > Elements
Published: 01 March 2005
Three diamonds (4.11-5.34 carats) decolorized by the HPHT-annealing process developed by General Electric. P hoto by E lizabeth S chrader , © G emological I nstitute of A merica (GIA).
Journal Article
Published: 01 May 2014
Journal of Sedimentary Research (2014) 84 (5): 373–393.
... partially dissolved, and iron was reduced to Fe 2+ due to redox reactions and removed, resulting in the sandstone decoloration and in a marked development of the secondary porosity. Minor montmorillonite replaced kaolinite and detrital feldspars, and a poikilotopic calcite precipitated, filling the pores...
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Journal Article
Published: 01 October 2011
Clays and Clay Minerals (2011) 59 (5): 466–477.
...Figure 6. Decoloration of X-GN through different processes: (a) FeAl-Mt/H 2 O 2 /visible light, (b) FeAl-Mt/H 2 O 2 , (c) FeAl- Mt/visible light, and (d) H 2 O 2 /visible light. [X-GN] 0 = 100 mg L −1 , pH = 3.0, FeAl 0.8 -Mt = 0.4 g L − 1 , T = 30ºC, [H 2 O 2 ] 0 = 3.92 mmol L −. 1 Error...
FIGURES | View All (13)
Journal Article
Published: 01 July 2002
European Journal of Mineralogy (2002) 14 (4): 749–756.
... oxide as decolorant during the melting procedure. This work shows that X-ray Absorption Spectroscopy is a potentially very useful nondestructive technique that can be applied in archaeological studies on many different materials. The microprobe analyses performed on several points of each glass...
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Journal Article
Published: 01 August 1985
American Mineralogist (1985) 70 (7-8): 829–837.
... chemical controls and to evaluate its potential as a stratigraphic tool for paragenetic analysis and the correlation of veins. The apatites vary from green to colorless probably as a result of interaction between a green-producing chromaphore (most probably Fe 2+ ) and REE decolorizing agents (possibly Nd...
Series: Proceedings of the International Clay Conference, Proceedings of the International Clay Conference
Published: 01 January 1985
DOI: 10.1346/CMS-ICC-1.1
EISBN: 9781881208396
..., a decolorizing agent for mineral and vegetable oils, an adsorbent of undesirable polar compounds in cigarette filters, an adsorbent for toxins in the gastrointestinal tract, a catalytic support in petrochemical processes, a thixotropic agent in cosmetic preparations, a suspension agent in fertilizers...
Journal Article
Published: 01 June 1944
American Mineralogist (1944) 29 (5-6): 235–241.
... the war tried to correlate the adsorption of malachite green, for example, with oil decolorization. My work has been confined to reactions between identified specimens, and wherever possible to clay minerals, and a limited number of organic compounds. This is absolutely necessary in a study...
Journal Article
Published: 01 April 1936
American Mineralogist (1936) 21 (4): 258–263.
...Nora M. Mohler Abstract The absorption curve of smoky quartz was determined from 700 to 200 µm ; this was compared with its absorption after decoloration by heat and exposure to radium, and with clear crystalline and fused quartz colored by the same exposure. Some fluorescence effects were noted...
Journal Article
Published: 01 October 1923
American Mineralogist (1923) 8 (10): 171–180.
...S. C. Lind; D. C. Bakdwell Abstract In an earlier paper 2 one of us reported some observations on the coloring, decolorization and thermophosphorescent effects resulting from the radiation of glass by radium rays. Similar experiments, extended to transparent minerals and gems, are described...
Journal Article
Published: 01 December 1917
American Mineralogist (1917) 2 (12): 145–147.
... or less extent. Dittler pointed out, further, that the rate of decolorization of a dye solution seems to be dependent on the water content of the mineral powder. Also, that the acid and basic character of the mineral is a considerable factor,—the more acid a gel the more quickly it seems to adsorb a dye...
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The effect of NaOH solution concentrations used to prepareNaOH-modified fly...
Published: 01 December 2016
Figure 6. The effect of NaOH solution concentrations used to prepareNaOH-modified fly ash on the decolorization rate of (a) MB and (b) AF on fly ash: Sample designations are the same as in Figure 1 . Experiment conditions: pH = 2, 30°C, 50 mL volume, and 30 mg/L initial MB or AF concentration.
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The effect of NaOH-modified fly ash (modified with 6 mol/L NaOH) on the dec...
Published: 01 December 2016
Figure 7. The effect of NaOH-modified fly ash (modified with 6 mol/L NaOH) on the decolorization rate of (a) MB and (b) AF. Experiment conditions: pH = 2, 30°C, 50 mL volume, and 30 mg/L initial MB or AF concentration.