Highly efficient oxidative degradation of organic dyes by manganese dioxide nanoflowers

Chiam, Sin-Ling; Pung, Swee‐Yong; Yeoh, Fei-Yee; Ahmadipour, Mohsen

doi:10.1016/j.matchemphys.2022.125848

Cited by 44 publications

(10 citation statements)

References 58 publications

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“…The resulting Fe 2+ can subsequently take part in the Fenton reaction and produces hydroxyl radicals, which will further degrade the dye pollutant. 61 , 62 When the reaction mixture is irradiated under visible light, the catalyst produces photoinduced electron–hole pairs and acts as powerful reducing and oxidizing agents, respectively. The water or hydroxide ions adsorbed on the surface of the catalyst react with the holes in the valence band and form a hydroxyl radical ( · OH).…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the Fe 3+ ion present converts Mn 3+ to Mn 4+ and itself reduces to Fe 2+ . The resulting Fe 2+ can subsequently take part in the Fenton reaction and produces hydroxyl radicals, which will further degrade the dye pollutant. , When the reaction mixture is irradiated under visible light, the catalyst produces photoinduced electron–hole pairs and acts as powerful reducing and oxidizing agents, respectively. The water or hydroxide ions adsorbed on the surface of the catalyst react with the holes in the valence band and form a hydroxyl radical ( · OH). , The · OH being a very strong oxidizing agent will result in the degradation of the MB dye and produce various substances like water, carbon dioxide, sulfate, hydrochloric acid, and nitrate at very low concentrations.…”

Section: Resultsmentioning

confidence: 99%

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New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

et al. 2023

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This paper presents the rare earth doping effect on the structural, optical, and magnetic properties of bilayered Ruddlesden–Popper oxides Sr 2 La 0.5 R 0.5 FeMnO 7 (R = La, Nd, Sm, Gd, Dy). Moreover, we are reporting for the first time a new rare earth-doped bilayered perovskite oxide series for the highly toxic methylene blue dye degradation in wastewater under visible light. Structural analysis of the PXRD data using the Rietveld refinements confirms the formation of the phases in tetragonal symmetry with the I 4/ mmm space group. The unit cell lattice parameters ( a & c ) and the cell volume ( V ) decrease monotonically from La- to Dy-doped samples owing to the decrease in the lanthanide ionic radii. The X-ray photoelectron spectroscopy analysis indicates the existence of the Mn ions in the mixed valence state. The DRS study shows that the energy band gap value decreases on moving from La to Gd substitution; however, it further increases for the Dy-doped sample. The magnetic measurements reveal that all the phases exhibit dominant anti-ferromagnetic interactions with Neel temperature ( T N ) observed at 150, 147, 138, 113, and 117 K for La-, Nd-, Sm-, Gd-, and Dy-substituted phases, respectively. However, the presence of an unsaturated hysteresis loop observed in the isothermal magnetic field ( H ) vs magnetization ( M ) plot also indicates the existence of weak ferromagnetic interactions. The investigation of the photocatalytic activity of the synthesized samples was done by carrying out photo-oxidative degradation of methylene blue (MB) dye pollutants. The results show that the photodegradation enhances by doping with heavier rare earth ions with the exception of the Dy-doped sample. The Gd-doped catalyst shows the maximum degradation efficiency of 99.03% in 50 min under visible light irradiation. The scavenging experiments confirmed that the · OH was the main/dominant oxidizing agent involved in the degradation of the MB dye.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

et al. 2023

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“…A 4 mL portion of the solution was taken every 15 min and centrifuged. The concentration of each pollutant left in the supernatant solution was analyzed using a UV–vis–NIR spectrometer (V-670, JASCO, Tokyo Japan). − Finally, the degradation efficiencies of organic dyes and TC were calculated based on eq − degradation efficiency false( % false) = C 0 − C t C 0 × 100 where C t is the concentration at irradiation time t and C 0 is the initial concentration of the pollutant.…”

Section: Methodsmentioning

confidence: 99%

Highly Efficient Solar Light Driven g-C₃N₄@Cs_0.33WO₃ Heterojunction for the Photodegradation of Colorless Antibiotics

Tessema

Motora

2022

ACS Omega

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This study facilitates the synthesis of a graphitic carbon nitride/cesium tungsten oxide (g-C3N4@Cs0.33WO3) heterojunction using a solvothermal method. The photocatalytic activities of the prepared samples were examined for the photodegradation of colorless antibiotics, namely tetracycline, enrofloxacin, and ciprofloxacin, as well as cationic and anionic dyes, such as methyl orange, rhodamine B, neutral red, and methylene blue, under full-spectrum solar light. We have purposely selected different kinds of wastewater pollutants of colorless antibiotics and cationic and anionic organic dyes to investigate the potential application of this heterojunction toward different groups of water pollutants. The results revealed that the g-C3N4@Cs0.33WO3 heterojunction showed an outstanding photocatalytic activity toward all the pollutants with concentrations of 20 ppm each at pH 3 by photocatalytically removing 97% of tetracycline within 3 h, 98% of enrofloxacin within 2 h, 97% of ciprofloxacin within 2.25 h, 98% of methylene blue in 1 h, 99% of rhodamine B within 2 h, 99% of neutral red in 1.25 h, and 95% of methyl orange in 2 h. These findings indicate that the developed photocatalyst possesses excellent photocatalytic properties toward seven different water pollutants that make it a universal photocatalyst. The developed g-C3N4@Cs0.33WO3 oxide heterojunction also presented a photocatalytic performance better than those of reported solar light active photocatalysts for photodegradation of rhodamine B and tetracycline. The efficient photocatalytic performance of the heterojunction can be ascribed to its extended light-absorbing ability, effective charge separation and fast charge transfer properties, and a high surface area. Moreover, an active species detection experiment also confirmed that superoxide radicals, hydroxyl radicals, and holes played significant roles in the photocatalysis of the organic dyes and tetracycline.

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“…0.7 g of KMnO 4 and 1.125 g of MnSO 4 were mixed and added to 440 ml of DI water and stirred at 80 1C for 3 h. After that, the mixture was centrifuged, filtered, washed and dried thoroughly. 48 Preparation of lm-MnO 2 /nm-MnO 2 composite coatings. 0.2 g of mm-MnO 2 and nm-MnO 2 (according to different mass ratios, five groups in total), PMDS precursor and curing agent ratio of 10 : 1 (total 0.2 g) were mixed.…”

Section: Preparation Of Materialsmentioning

confidence: 99%

“…0.7 g of KMnO 4 and 1.125 g of MnSO 4 were mixed and added to 440 ml of DI water and stirred at 80 °C for 3 h. After that, the mixture was centrifuged, filtered, washed and dried thoroughly. 48…”

Section: Experimental Partmentioning

confidence: 99%

Superhydrophobic coating with a micro- and nano-sized MnO₂/PDMS composite structure for passive anti-icing/active de-icing and photothermal applications

Li,

Yu,

Jiang

et al. 2023

J. Mater. Chem. C

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Highly efficient oxidative degradation of organic dyes by manganese dioxide nanoflowers

Cited by 44 publications

References 58 publications

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

Highly Efficient Solar Light Driven g-C₃N₄@Cs_0.33WO₃ Heterojunction for the Photodegradation of Colorless Antibiotics

Superhydrophobic coating with a micro- and nano-sized MnO₂/PDMS composite structure for passive anti-icing/active de-icing and photothermal applications

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Highly efficient oxidative degradation of organic dyes by manganese dioxide nanoflowers

Cited by 44 publications

References 58 publications

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr2La0.5R0.5FeMnO7 (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr2La0.5R0.5FeMnO7 (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

Highly Efficient Solar Light Driven g-C3N4@Cs0.33WO3 Heterojunction for the Photodegradation of Colorless Antibiotics

Superhydrophobic coating with a micro- and nano-sized MnO2/PDMS composite structure for passive anti-icing/active de-icing and photothermal applications

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Product

Resources

About

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

New Rare Earth-Doped Bilayered Perovskite Oxide Photocatalysts Sr₂La_0.5R_0.5FeMnO₇ (R = La, Nd, Sm, Gd, Dy) for the Degradation of Highly Toxic Methylene Blue Dye in Wastewater under Visible Light: Structural, Optical, and Magnetic Properties

Highly Efficient Solar Light Driven g-C₃N₄@Cs_0.33WO₃ Heterojunction for the Photodegradation of Colorless Antibiotics

Superhydrophobic coating with a micro- and nano-sized MnO₂/PDMS composite structure for passive anti-icing/active de-icing and photothermal applications