Mechanism and process of methylene blue degradation by manganese oxides under microwave irradiation

Wang, Xiaoyu; Mei, Lefu; Xiao, Xing; Liao, Libing; Lv, Guocheng; Li, Zhaohui; Wu, Limei

doi:10.1016/j.apcatb.2014.05.009

Cited by 76 publications

(34 citation statements)

References 36 publications

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“…in manganese oxides, due to its higher non-electric dipole moment in the crystal structure [14] , it has a stronger removal efficiency of organics under microwave irradiation.…”

mentioning

confidence: 99%

Synthesis and characterization of Mn intercalated Mg-Al hydrotalcite

Yang

Liao

et al. 2016

Journal of Colloid and Interface Science

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“…in manganese oxides, due to its higher non-electric dipole moment in the crystal structure [14] , it has a stronger removal efficiency of organics under microwave irradiation.…”

mentioning

confidence: 99%

Synthesis and characterization of Mn intercalated Mg-Al hydrotalcite

Yang

Liao

et al. 2016

Journal of Colloid and Interface Science

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“…In the present study, the rate constant (k) was found to be 0.0045 min −1 . In comparison, the rate constants of MB removal by akhtenskite and birnessite were only 0.0006 and 0.0007 min −1 , respectively [43]. Moreover, the higher value of k in our case reveals, the more suitability of the nanoparticles for the degradation of MB [44].…”

Section: Kinetics Of Mb Degradationmentioning

confidence: 77%

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Ullah

Kibria

Akter

et al. 2017

Water Conserv Sci Eng

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Mn 3 O 4 nanoparticles were synthesized from one-step reduction of KMnO 4 with glycerol at 80°C. The structural and surface morphological characterizations were carried out using FT-IR, XRD, and FESEM analyses. The elemental composition was evidenced from EDX analysis. XRD analysis showed the tetragonal crystal geometry of Mn 3 O 4 nanoparticles with an average crystallite size of ∼20 nm. The surface morphology of the Mn 3 O 4 nanoparticles was found to be spherical from the FESEM image. The Mn 3 O 4 nanoparticles were then tested as a potential oxidant for the decolorization of methylene blue (MB) and found to be capable of N-demethylation of MB forming thionine as the final product, and removing 80% of the dye in approximately 1 h. The decolorization of MB by Mn 3 O 4 occurred through a surface mechanism, i.e., formation of surface precursor complex between MB and surface-bound Mn (II, III), where, electron transfer occurs within the surface complex. The effect of suspension pH (3-4 < pH pzc ; 5-10 > pH pzc ) on MB decolorization was assessed. Suspension pH exerted double-edged effects on MB decolorization by influencing the formation of surface precursor complex, and reducing potential of the system.

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“…Figure 5 presents the ultraviolet-visible spectra in the range of 600 to 700 nm of methylene blue (initial concentration 100 mg/ L), a catalyst dose of 0.2 g, at a temperature of 25 8C, at pH 11, under a mercury-lamp, and with a contact time of 1 to 90 s. The maximum absorbance peak of methylene blue in aqueous solution was at 662 nm. As the photocatalytic reaction proceeded, two maximum peaks were recorded at 662 and 620 nm (Azure C) (Wang et al, 2014b;Zaied et al, 2011), with nearly the same absorbance heights. Moreover, as the reaction time was prolonged, the absorbance of the two peaks decreased, with a high rate at 662 nm and a low rate at 620 nm.…”

Section: Resultsmentioning

confidence: 98%

Photocatalytic Degradation of Methylene Blue Dye Using Silica Oxide Nanoparticles as a Catalyst

Aly

Abd-Elhamid

2018

Water Environment Research

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The present research deals with the development a fast and low-cost method for removing color dye from water using nanosized semiconductors SiO2 as photocatalyst. The studies of kinetic photocatalytic degradation were carried out on an aqueous solution of soluble methylene blue dye, which contained SiO2 nanoparticles and under an ultraviolet light source. Different parameters affecting the process have been studied: catalyst concentration, dye concentration, temperature, and pH of solution. The color variation was detected at three absorption bands (662, 293, and 243 nm). It was found that the dye completely degraded in 90 s, using 10 g/L SiO2 nanoparticles at 25 °C and pH 1.5 and 11.0. The adsorption of the dye well-fitted pseudo-second-order kinetic models. The Langmuir-Hinshelwood model was acquired to analyze the photocatalytic degradation process. A possible molecular mechanism for photocatalytic degradation of the dye by SiO2 nanoparticles is also given.

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Mechanism and process of methylene blue degradation by manganese oxides under microwave irradiation

Cited by 76 publications

References 36 publications

Synthesis and characterization of Mn intercalated Mg-Al hydrotalcite

Synthesis and characterization of Mn intercalated Mg-Al hydrotalcite

Oxidative Degradation of Methylene Blue Using Mn3O4 Nanoparticles

Photocatalytic Degradation of Methylene Blue Dye Using Silica Oxide Nanoparticles as a Catalyst

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