New insight into the microstructure of natural calcined laterites and their performance as heterogeneous Fenton catalyst for methylene blue degradation

Kpinsoton, Gloria Murielle Rostandi; Karoui, Héla; Richardson, Yohan; Koffi, Blédja N’dri Stéphanie; Yacouba, Hamma; Motuzas, Julius; Drobek, Martin; GANA, Abdou LAWANE

doi:10.1007/s11144-018-1406-0

Cited by 12 publications

(4 citation statements)

References 75 publications

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“…The taken-for-granted employ of the standard calibration curve at the maximum wavelength in all modern works (e.g. [32][33][34][35][36][37][38][39][40][41] ) is concrete evidence of that fact. 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.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

Visible Light Spectroscopic Analysis of Methylene Blue in Water

Fernández-Pérez

Marbán

2022

J Appl Spectrosc

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“…L'analyse du diffractogramme des Rayons X de la latérite DA (Figure 3) indique qu'elle est composée majoritairement du quartz (SiO 2 ), de la kaolinite (Al 2 Si 2 O 5 (OH) 4 ), de l'hématite (Fe 2 O 3 ) et de la goethite (FeO(OH)). Cette composition est cohérente avec celle généralement observée dans les latérites (Issiakou et al, 2015 ;Kpinsoton et al, 2018).…”

Section: Discussionunclassified

Caractérisation d’une latérite naturelle du Burkina Faso en vue de l’élimination de l’arsenic (III) et l’arsenic (V) dans les eaux souterraines

Ouedraogo¹,

Bakouan²,

Sorgho³

et al. 2020

Int. J. Bio. Chem. Sci

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RÉSUME L'arsenic est l'un des principaux polluants des eaux de forage, et constitue une des préoccupations internationales en raison de ses effets néfastes sur la santé humaine. Dans cette étude un matériau latéritique a été utilisé pour l'élimination de l'arsenic (III) et l'arsenic (V) dans une solution aqueuse. La latérite utilisée est référencée DA et caractérisée par différentes méthodes physico-chimiques (DRX, FTIR, analyse chimique élémentaire, MEB). La caractérisation a permis la quantification des minéraux présents dans DA (48,32% de kaolinite ; 13,11% d'hématite ; 7,29% de goethite et 22,53% de quartz). Elle a également révélé que DA a un de 4,5 et présente une importante capacité d'échange anionique (CEA) allant de 40,61 ± 2,03 à 230,80 ± 17,03 cmol.kg-1 aux pH 2,42 à 10. Cette caractérisation a permis de mettre en évidence les propriétés adsorbantes du matériau latéritique qui lui confère un pouvoir adsorbant intéressant pour l'élimination de l'arsenic dans des eaux souterraines. L'étude de la cinétique a montré que l'équilibre est atteint à partir de 16 heures de temps de contact entre la latérite et la solution contenant l'arsenic (III) et l'arsenic (V) et leur adsorption suit un modèle cinétique du pseudo-second ordre. Cela suggère l'existence d'une chimisorption des deux espèces d'arsenic. Les résultats de l'effet de dose ont montré une élimination atteignant 0,33 mg/g de As (V) soit 99,69% et 0,30 mg/g de As (III) soit 97,30% pour une dose de 0,75 g de latérite.

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“…e effect of the amount of the laterite after MnO 2 NP (M2) catalyst coating on the removal of methylene blue is investigated and is shown in Figure 10 and Table S6 (Supplementary materials). e result shows that the degradation efficiency increases with increasing catalyst content, due to the increase in the catalytic active sites on the surface of the catalyst and the associated generated free hydroxyl radicals (equations (9)-(12)) [29,30]. Especially, the degradation efficiency increases rapidly in the range of 0.5 to 1.5 g of M2 ( Figure 10):…”

Section: Effect Of Catalyst Dosagementioning

confidence: 96%

“…However, when the amount of M2 increased over 1.5 g, the degradation efficiency did not change so much. is phenomenon is attributed to the scavenging effect of HO * radicals during unwanted side reactions over the catalyst surface M2, resulting in a reduction of the availability of HO * and degradation efficiency [29]:…”

Section: Effect Of Catalyst Dosagementioning

confidence: 99%

Preparation of Manganese Dioxide Nanoparticles on Laterite for Methylene Blue Degradation

Ngo

Thuan

et al. 2019

Journal of Chemistry

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The laterite-coating manganese dioxide nanoparticle material (M2) prepared by the immersion method was used for the efficient removal of methylene blue (MB) from aqueous solution. The adsorption and heterogeneous Fenton catalytic oxidation experiments of M2 were investigated by changing the effective factors such as time, pH, amount of M2, and concentration of MB. The adsorption data of M2 showed good fitting with the Langmuir isotherm, suggesting that the adsorption of MB on the surface of M2 is a heterogeneous and physical adsorption process. Degradation of MB was also carried out to evaluate the heterogeneous Fenton catalytic oxidation characterization of a new catalytic oxidation material (M2). The results show that the M2 material has both adsorption and heterogeneous Fenton catalytic oxidation. However, the heterogeneous Fenton catalytic oxidation of the M2 material is the main performance. Hence, our groups have investigated the ability of the catalytic column treatment with high efficiency of 98–100% and the degradation efficiency after the sample running through the column almost does not change much. This proves that heterogeneous Fenton catalytic activity of the catalytic column is completely unaffected and reused many times after oxidizing MB. Specifically, even if the M2 material is reused for five times, the degradation efficiency still reaches 98.86%.

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New insight into the microstructure of natural calcined laterites and their performance as heterogeneous Fenton catalyst for methylene blue degradation

Cited by 12 publications

References 75 publications

Visible Light Spectroscopic Analysis of Methylene Blue in Water

Visible Light Spectroscopic Analysis of Methylene Blue in Water

Caractérisation d’une latérite naturelle du Burkina Faso en vue de l’élimination de l’arsenic (III) et l’arsenic (V) dans les eaux souterraines

Preparation of Manganese Dioxide Nanoparticles on Laterite for Methylene Blue Degradation

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