What Is Happening When the Blue Bottle Bleaches: An Investigation of the Methylene Blue-Catalyzed Air Oxidation of Glucose

Anderson, Louise E.; Wittkopp, Stacy M.; Painter, C. J.; Liegel, Jessica; Schreiner, R. N.; Bell, J. S.; Shakhashiri, Bassam Z.

doi:10.1021/ed200511d

Cited by 51 publications

(69 citation statements)

References 16 publications

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“…Based on the literature background, 17,18 one can assume that this colorimetric reaction is of a global order 2, with respect to the oxygen and to the dihydroresorufin. The rate of consumption of dihydroresorufin, r B (or the rate of consumption of oxygen r O2 ) is then expressed as:…”

Section: About the Kinetics Of The Colorimetric Reactionmentioning

confidence: 99%

“…Based on the literature background, one can assume that this colorimetric reaction is of a global order 2, with respect to the oxygen and to the dihydroresorufin. The rate of consumption of dihydroresorufin,

r_{B}

(or the rate of consumption of oxygen

r_{O_{2}}

) is then expressed as:

r_{B} = - ν \cdot k_{2} \cdot C_{O_{2}} \cdot C_{B} = ν \cdot r_{O_{2}} .

where

k_{2}

is the reaction rate constant (m 3 ·mol −1 ·s −1 ) and

ν

the stoichiometric coefficient equal to 2.…”

Section: Introductionmentioning

confidence: 99%

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Optical methods to investigate the enhancement factor of an oxygen‐sensitive colorimetric reaction using microreactors

et al. 2016

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Abstract: Visualization of mass transfer is a powerful tool to improve understanding of local phenomenon. The use of an oxygen-sensitive dye (colorimetric technique 1 ) has showed its relevancy for locally visualizing and characterizing gas-liquid mass transfer at different scales 2,3 . At present, the occurrence of a possible enhancement of the gas-liquid mass transfer by this reaction has not been yet demonstrated. This paper aims at filling this gap by evaluating the Hatta number Ha and the enhancement factor E associated with the oxygen colorimetric reaction when implementing in milli/micro channels. For that, as data on the kinetic of the colorimetric reaction are seldom in the literature, the reaction characteristic time was firstly estimated by carrying out experiments in a microchannel equipped with a micromixer. The diffusion coefficients of dihydroresorufin and O 2 were then determined by implementing two original optical methods in a specific coflow microchannel device, coupled with theoretical modelling. The knowledge of these parameters enabled at last to demonstrate that no enhancement of the gas-liquid mass transfer by this colorimetric reaction existed.Complementary information about the reliability of the colorimetric technique to characterize the gasliquid mass transfer in milli/micro systems was also given.

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Section: About the Kinetics Of The Colorimetric Reactionmentioning

confidence: 99%

r_{B}

(or the rate of consumption of oxygen

r_{O_{2}}

) is then expressed as:

r_{B} = - ν \cdot k_{2} \cdot C_{O_{2}} \cdot C_{B} = ν \cdot r_{O_{2}} .

where

k_{2}

is the reaction rate constant (m 3 ·mol −1 ·s −1 ) and

ν

the stoichiometric coefficient equal to 2.…”

Section: Introductionmentioning

confidence: 99%

Optical methods to investigate the enhancement factor of an oxygen‐sensitive colorimetric reaction using microreactors

et al. 2016

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“…After 30 min of illumination, the same sample again acquires a negatively charged surface with an average nvalue (-) 20.0 mV. This may be ascribed to accumulation of negatively charged electrons on the oxide surface when donation of non-bonding electrons of S-atom of MBH (see Scheme 2) occurs to the surface of Cu 2 O NPs [26]. Also it is observed from Table 1 that, when MB interacts with Cu 2 O NPs, the full width at half maximum (FWHM), i.e., width of zeta band has increased from 9.8 to 11.0 mV.…”

Section: Ftir Spectra and Dlsmentioning

confidence: 99%

Inquiring the photocatalytic activity of cuprous oxide nanoparticles synthesized by a green route on methylene blue dye

Behera¹,

Giri²

2016

Int J Ind Chem

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We synthesized cuprous oxide (Cu 2 O) nanoparticles (NPs) with an average crystallite size of 8.8 nm in presence of Arka (Calotropis gigantea) leaves extract. The photo-bleaching activity of Cu 2 O NPs on the aqueous methylene blue (MB) dye was studied by illumination of visible light. In the absorption spectra, a decrease in the absorption peak intensity at 665 nm of MB was observed in presence of Cu 2 O NPs. A red shift in its peak position as a function of irradiation time is suggesting that oxide particles are degrading the organic dye in an aqueous medium. In the vibration spectra, red shift in the C-H stretching band (2954, 2926, and 2855 cm -1 ) of methylene group and C-N stretching band (1343 and 1226 cm -1 ) of MB in presence of Cu 2 O NPs proposes a surface adsorption of MB over NP's surfaces. Quenching in the emission band intensity and red shifts in the peak maxima of MB in presence of Cu 2 O NPs is ascribed to the charge transfer interaction between MB and oxide NPs. A linear SternVolmer plot reveals that decrease in the emission intensity of MB dye occurs via the dynamic quenching mechanism. Synthesis of Cu 2 O NPs of various architectures using a green route could be use as an approach towards the costeffective treatment of water pollutants.

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“…Additionally, the demonstration has well-known kinetics that can be studied in high school or collegiate chemistry courses. 1,5,6 A related reaction, reduction of methylene blue by ascorbic acid in acidic media, has also been used to illustrate kinetics in an educational setting. 7,8 Information about the blue-bottle demonstration was published in this Journal in 1963, but its origins extend back in time well before that.…”

Section: ■ Backgroundmentioning

confidence: 99%

Variations on the “Blue-Bottle” Demonstration Using Food Items That Contain FD&C Blue #1

2015

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What Is Happening When the Blue Bottle Bleaches: An Investigation of the Methylene Blue-Catalyzed Air Oxidation of Glucose

Cited by 51 publications

References 16 publications

Optical methods to investigate the enhancement factor of an oxygen‐sensitive colorimetric reaction using microreactors

Optical methods to investigate the enhancement factor of an oxygen‐sensitive colorimetric reaction using microreactors

Inquiring the photocatalytic activity of cuprous oxide nanoparticles synthesized by a green route on methylene blue dye

Variations on the “Blue-Bottle” Demonstration Using Food Items That Contain FD&C Blue #1

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