Evaluation and optimisation of methylene blue removal measurement uncertainty in photodegradation studies

Rosa, Nuno F.; Monteiro, Olinda C.; Camões, Maria Filomena; Silva, Ricardo J.N. Bettencourt da

doi:10.1007/s00769-017-1272-x

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…In fact, the standard deviation of the mean in temperature and/or chloride concentration (Figure 3). On the other hand, equation (4) shows a more than satisfactory prediction (Figure 3) with a mean relative error as low as 0.00 ± 3.16%. This error was obtained via an error minimization procedure in which the I F values were optimized with respect to those evaluated experimentally, though the differences between experimental and optimized values were found to be negligible (1 versus 1, 1.004 versus 1.018 and 1.145 versus 1.153 for the experimental and optimized values, respectively, of the three cuvettes).…”

Section: The Universal Calibration Curvementioning

confidence: 94%

“…This approximation may be valid for small concentration ranges, though the application conditions should be the result of a complex decision-making process to tackle the measurement uncertainty. 4,42 The present work is the final piece of a comprehensive research on the self-aggregation behaviour of methylene blue in water. 3,31 Here, we describe a simple way to build the calibration curve of aqueous methylene blue and, by extension, of any polymerizable dye in water.…”

Section: Introductionmentioning

confidence: 99%

“…However, deviations from linearity of the relation between A 664 and C MB are commonplace. [4][5][6][7][8][9][10] These deviations must be ascribed to the self-aggregation tendency of dyes in solution, affecting the shape of the UV-Visible spectra. In the case of methylene blue, the long historical scientific effort to provide the reliable identification of aggregates existing in solution together with accurate optical an thermodynamic parameters of formation of the different species, 11,12,[21][22][23][24][25][26][27][28][29][30][13][14][15][16][17][18][19][20] has been recently successfully accomplished.…”

Section: Introductionmentioning

confidence: 99%

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Visible Light Spectroscopic Analysis of Methylene Blue in Water

Fernández-Pérez

Marbán

2022

J Appl Spectrosc

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We herein report a universal calibration curve for the UV-Visible spectrophotometric determination of the concentration of polymerizable dyes (C dye ) in solution. The equation for the calibration curve is ∑ ( ) , in which m is the number of dye species in solution, both monomeric and aggregates, I F is the instrumental factor that takes values around 1, L is the path length, are the absorbance values at λ i , which are the characteristic wavelengths of maximum absorption for all dye species, and β i are coefficients of proportionality that can be evaluated either with the molar attenuation coefficients of the different dye species (if known) or via error minimization. The method has been successfully applied to construct a calibration curve of methylene blue in water which is applicable in a wide range of methylene blue and chloride concentrations, regardless of both the aggregate concentration distribution and the temperature. In addition, it was found that the molar fractions of each MB species in solution could be fairly approximated by means of simple algebraic expressions in the A 650 /A 607 absorbance ratio.

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Section: The Universal Calibration Curvementioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Visible Light Spectroscopic Analysis of Methylene Blue in Water

Fernández-Pérez

Marbán

2022

J Appl Spectrosc

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“…After two months operating, the microbial synthesized ZnS was obtained on the bottom of the reactor. the obtained ZnS were washed with water, and dispersed in 100 ml of different concentrations MB solution for photodegradation experiments [5]. Photocatalytic experiments.…”

Section: Methodsmentioning

confidence: 99%

“…Where C is the cyanide concentration at time t, C 0 is the initial MB concentration, and K app is the apparent first-order rate constant [6]. DNA extraction, real-time PCR.…”

Section: Methodsmentioning

confidence: 99%

Study of Photodegradation of Methylene Blue by Microbial Synthesized ZnS Material

Li¹,

Gu²,

Liu³

et al. 2018

MSF

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The microbial synthesized ZnS obtained from a pilot-scale sulfate reducing bacteria (SRB) fixed bed reactor was investigated as photocatalyst. The SRB fixed bed reactor as used to treat the Zinc containing wastewater with the influent concentration of 200~300 mg Zn/L. The microbial synthesized ZnS was used as photocatalyst for methylene blue (MB) photodegradation. The results indicated that the photodegradation process could be promoted when the dosage of microbial synthesized ZnS increased. High initial MB concentration could promote the photodegradation reaction. The excellent performance of microbial synthesized ZnS in photodegradation could be explained as the formation of ZnS nanoparticles. The photodegradation with microbial synthesized ZnS were simulated by pseudo-first-order kinetics model. The apparent first-order rate constant of the ZnS catalyst was 0.15 min-1.

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