Adsorption Behavior of Methylene Blue and Its Congeners on a Stainless Steel Surface

Imamura, Koreyoshi; Ikeda, Erika; Nagayasu, Takeshi; Sakiyama, Takaharu; Nakanishi, Koji

doi:10.1006/jcis.2001.7967

Cited by 99 publications

(74 citation statements)

References 33 publications

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“…These findings suggest that the transition moments of -C=C-and -C=N-stretching were orientated perpendicular to the stainless steel surface, while the transition moment of -C-N-stretching was somewhat out of a perpendicular orientation. Such bond orientations could happen if the polyheterocyclic rings of the dye molecules were orientated perpendicular to the stainless steel surface (Imamura et al 2002). Similar results have been found in the present study.…”

Section: Configuration Of Mb Molecules In the Interlayersupporting

confidence: 91%

“…Similar results have been found in the present study. Calculations showed that the S atoms would carry positive charges equivalent to +0.59 × 10 -19 C while the three N atoms would carry positive charges equivalent to +0.26 × 10 -19 C (Imamura et al 2002). In a vertical configuration, interaction between SAz-1 surfaces and the partially positively charged S atom or amine groups would be much stronger than that expected for a tilted orientation.…”

Section: Configuration Of Mb Molecules In the Interlayermentioning

confidence: 90%

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Intercalation of Methylene Blue in a High-Charge Calcium Montmorillonite — An Indication of Surface Charge Determination

Wang

Jiang

2010

Adsorption Science & Technology

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ABSTRACT:The suitability and applicability of using Methylene Blue (MB), a cationic dye, for cation-exchange capacity (CEC) and specific surface area (SSA) determinations has been studied extensively. Although many workers have reported satisfactory results between the CEC determined by the MB method and other methods, large discrepancies among CEC values determined by different methods are also found in the literature. The work reported herein was focused at elucidating the interlayer configuration of adsorbed/intercalated MB in SAz-1, a high-charge montmorillonite, using MB adsorption, exchangeable cation desorption, counterion (Cl -) adsorption, X-ray diffraction (XRD) and Fouriertransform infrared (FT-IR) analyses.A complete balance between the amount of MB cation adsorbed and that of exchangeable cations desorbed at a 1:1 charge ratio for MB uptake by SAz-1 indicated that cation-exchange was the most important mechanism in this case together with supplementary hydrogen bonding. The adsorbed MB molecules associated into dimers and were orientated in the interlayer in a nearly vertical configuration, with the sulphur atom keyed onto the surface. In a vertical orientation, the MB dimer occupies a projected area of 120-130 Å 2 , similar to the surface area of 130 Å 2 previously assumed from SSA determinations for the horizontally aligned MB molecule. Hence, it is the charge density rather than the horizontal configuration of the MB molecules that controls the MB adsorption capacity. As such, the CEC determination of swelling clays using the MB adsorption method is justified. However, SSA determination by the MB method is correct only if the charge density is less than the projected area of 120-130 Å 2 for an MB dimer. This suggests that the previous assumption of the adsorption of a horizontally orientated MB molecule onto the surface of clay minerals is questionable.

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Section: Configuration Of Mb Molecules In the Interlayersupporting

confidence: 91%

Section: Configuration Of Mb Molecules In the Interlayermentioning

confidence: 90%

Intercalation of Methylene Blue in a High-Charge Calcium Montmorillonite — An Indication of Surface Charge Determination

Wang

Jiang

2010

Adsorption Science & Technology

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“…5 showed the FT-IR spectra changes of MB in Na-OL-1/H 2 O 2 suspension with reaction time increasing. In curve a, the peaks at 1601 and 1396 cm −1 were assigned to C N and C-N bond in the heterocycle of MB, respectively [36], while the peaks at 1356 and 1337 cm −1 were attributed to the C-N bond connected with benzene ring and N-CH 3 bond [37,38]. As shown in curve b, these characteristic peaks disappeared after reaction for 60 min.…”

Section: Catalytic Performance Of Na-ol-1mentioning

confidence: 88%

Decolorization of methylene blue in layered manganese oxide suspension with H2O2

Zhang

Nie

et al. 2011

Journal of Hazardous Materials

122

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a b s t r a c tLayered birnessite-type manganese oxides (Na-OL-1) were prepared via a redox reaction involving MnO 4 − and Mn 2+ under markedly alkaline conditions. According to the XRD analysis, the resulting material exhibited a well-crystallized octahedral layer (OL) structure with several different phases, including ␤-MnOOH, ␣-MnOOH and ␥-Mn 3 O 4 . The catalyst was highly effective for the decolorization and degradation of methylene blue (MB) in the presence of H 2 O 2 at neutral pH. The tested MB was completely decolorized in Na-OL-1 suspension by the fraction dosing of H 2 O 2 (556.5 mM at the beginning and then 183.8 mM at 40 min). Based on the studies of electron spin resonance and the effect of radical scavengers, the 1 O 2 and O 2 •− were the main reactive oxygen species (ROS) in the reaction. It was found that both oxygen and ROS were generated from the decomposition of H 2 O 2 in Na-OL-1 suspension, wherein the decomposition pathways were proposed. The generation of H 2 O 2 in Na-OL-1 suspension at air atmosphere indicated that the existence of multivalent manganese oxides greatly enhanced the interfacial electron transfer, leading to the high activity of Na-OL-1.

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“…In order to achieve a high degree of dye removal from wastewater systems, it is necessary to integrate biological, chemical and physical processes such as coagulation, ultra-filtration, electro-chemical adsorption and photo-oxidation [6] . Physical adsorption techniques are generally considered as the preferred means for removing and purifying organic substances due to their high efficiency and ability to separate a wide range of chemical compounds [7][8][9][10][11] . The above reasons have prompted enormous research interest in the use of agricultural waste as starting materials because of their low-cost and widespread availability.…”

Section: Introductionmentioning

confidence: 99%

The Removal of Methyl Red from Aqueous Solutions Using Banana Pseudostem Fibers

Haris¹,

Sathasivam²

2009

American J. of Applied Sciences

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Problem statement:The aim of this study was to investigate the removal of methyl red, a mutagenic monoazo dye, from various aqueous solutions using banana pseudostem fibers of the size 212-350 micron. Approach: The parameters studied were the effect of pH, amount of adsorbent, contact time, concentration of adsorbate and agitation speed. Results: Equilibrium data were fitted to the Langmuir and Freundlich isotherm models. The data were best represented by the latter with an adsorption capacity and adsorption intensity of 0.351 and 0.302, respectively. Conclusion/Recommendations: Specific rate constants of the processes were calculated by kinetic measurements and a pseudo second order adsorption kinetics was obtained for all cases.

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Adsorption Behavior of Methylene Blue and Its Congeners on a Stainless Steel Surface

Cited by 99 publications

References 33 publications

Intercalation of Methylene Blue in a High-Charge Calcium Montmorillonite — An Indication of Surface Charge Determination

Intercalation of Methylene Blue in a High-Charge Calcium Montmorillonite — An Indication of Surface Charge Determination

Decolorization of methylene blue in layered manganese oxide suspension with H2O2

The Removal of Methyl Red from Aqueous Solutions Using Banana Pseudostem Fibers

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