Degradation and mineralization of methylene blue using a heterogeneous photo-Fenton catalyst under visible and solar light irradiation

Ahmed, Yunus; Yaakob, Zahira; Akhtar, Parul

doi:10.1039/c5cy01494h

Cited by 165 publications

(52 citation statements)

References 47 publications

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“…The hydroxyl radicals plays a most important part in the degradation of MB [38]. Terephthalic acid was employed as a probe molecule (Scheme 2) to detect the hydroxyl radicals ( • OH) [24,39,40] on the surface of LP(Ti).…”

Section: Mechanism For the Mb Degradation In Lp(ti)/visible/h 2 O 2 Smentioning

confidence: 99%

TiO2 encapsulated in Salicylaldehyde-NH2-MIL-101(Cr) for enhanced visible light-driven photodegradation of MB

Xia

et al. 2016

Applied Catalysis B: Environmental

201

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Section: Mechanism For the Mb Degradation In Lp(ti)/visible/h 2 O 2 Smentioning

confidence: 99%

TiO2 encapsulated in Salicylaldehyde-NH2-MIL-101(Cr) for enhanced visible light-driven photodegradation of MB

Xia

et al. 2016

Applied Catalysis B: Environmental

201

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“…When the concentration of the catalyst was increased from 75 mg (5.3 × 10 −2 mmol of Fe) to 125 mg (8.9 × 10 −2 mmol of Fe), the degradation efficiency for XO increased from 63.36% to 98.88% may have been due to the increase in active sites on the surface of the catalyst and generated more free hydroxyl radicals [ ˙ OH; Figure (a)]. Above 125 mg of catalyst, the degradation efficiency for XO was not enhanced because of the scavenging effect of ·OH radicals as the Fe(II) sites formed during the course of the reaction may have been attacked by ·OH radicals to form Fe(III) sites …”

Section: Resultsmentioning

confidence: 99%

Poly(styrene–divinyl benzene)‐immobilized Fe(III) complex of 1,3‐bis(benzimidazolyl)benzene: Efficient catalyst for the photocatalytic degradation of xylenol orange

Rao

Gayathri

2018

J of Applied Polymer Sci

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A polymer‐supported Fe(III) complex of 1,3‐bis(benzimidazolyl)benzene [PS–Fe(III)BBZNH] was used in the photodegradation of xylenol orange (XO) dye with H2O2 under UV irradiation. The catalyst was synthesized and characterized by elemental analysis, and Fourier transform infrared, far‐infrared, and UV–visible–diffuse reflectance spectroscopy, Scanning electron microscopy, Brunauer–Emmett–Teller surface area measurements, thermogravimetric analysis, and magnetic measurements. An octahedral coordination around Fe(III) was confirmed by electronic spectral data, and a decrease in the intensity of the νCH2Cl peak in PS–Fe(III)BBZNH was observed compared to the polymer support; this indicated the binding of the ligand to the support. An array of experiments were carried out to assess the influence of various reaction parameters on its photocatalytic performance to ensure maximum dye degradation. The maximum photocatalytic activity was observed at pH 8 with 125 mg of catalyst, 300 ppm of XO, and 200 ppm of H2O2 with complete mineralization after 90 min, as confirmed by chemical oxygen demand measurements. Furthermore, the reactions were repeated under sunlight and under dark conditions to check the photocatalytic efficiency of PS–Fe(III)BBZNH. It displayed better catalytic performance compared than the unsupported complex, PS–Cu(II)BBZNH [Cu(II) complex of 1,3‐bis(benzimidazolyl)benzene], and PS–VO(IV)BBZNH [VO(IV) complex of 1,3‐bis(benzimidazolyl)benzene]. PS–Fe(III)BBZNH could be recycled for up to seven runs. A tentative mechanism involving ·OH radical was proposed. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46480.

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“…Most significant changes were observed for the MB film which peak potential shifted by about 120 mV probably due to its high photosensitizing activity. Photodegradation of MB can result in irreversible oxidation of the dye . Nevertheless, such changes were well reproducible.…”

Section: Resultsmentioning

confidence: 99%

Voltammetric Detection of Oxidative DNA Damage Based on Interactions between Polymeric Dyes and DNA

et al. 2016

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Oxidative damage of DNA was assessed with glassy carbon electrode (GCE) coated with electropolymerized Methylene Blue (MB). For this purpose, DNA solution was first mixed with an oxidant (Fenton reagent, H2O2 alone and in the presence of Cu(II) ions) and then placed on the polymeric film surface. After washing, the cyclic voltammogram was recorded in buffer solution and the anodic peak potential measured against that before the contact with DNA. Oxidative DNA damage resulted in remarkable decrease of the anodic peak potential which depended on the oxidant nature and incubation period. Specificity of the DNA – MB interactions was confirmed by surface plasmon resonance (SPR) measurements. Similar experiment performed with polymerized Methylene Green (MG) and Neutral Red (NR) showed lower selectivity of the response toward various sources of reactive oxygen species. The protocol of the DNA damage detection was tested on the estimation of antioxidant properties of green tea extract and red table wine.

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Degradation and mineralization of methylene blue using a heterogeneous photo-Fenton catalyst under visible and solar light irradiation

Abstract: A SiO2-supported Fe and Ni bimetallic catalyst has been synthesized, characterized and, for the first time, tested as a heterogeneous photo-Fenton catalyst for the degradation and mineralization of methylene blue (MB) dye.

Cited by 165 publications

References 47 publications

TiO2 encapsulated in Salicylaldehyde-NH2-MIL-101(Cr) for enhanced visible light-driven photodegradation of MB

TiO2 encapsulated in Salicylaldehyde-NH2-MIL-101(Cr) for enhanced visible light-driven photodegradation of MB

Poly(styrene–divinyl benzene)‐immobilized Fe(III) complex of 1,3‐bis(benzimidazolyl)benzene: Efficient catalyst for the photocatalytic degradation of xylenol orange

Voltammetric Detection of Oxidative DNA Damage Based on Interactions between Polymeric Dyes and DNA

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