Eco-friendly synthesis of recyclable mesoporous zinc ferrite@reduced graphene oxide nanocomposite for efficient photocatalytic dye degradation under solar radiation

Baynosa, Marjorie Lara; Mady, A.H.; Nguyen, Van Quang; Kumar, Deivasigamani Ranjith; Sayed, Mohamed A.; Tůma, Dirk; Shim, Jae‐Jin

doi:10.1016/j.jcis.2019.11.018

Cited by 75 publications

(27 citation statements)

References 54 publications

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“…ions occupy the tetrahedral (A) sites while the Fe 3? ions take up the octahedral (B) sites in a unit cell of 32 oxygen (O) atoms in a cubic close-packed (ccp) arrangement [2]. ZnFe 2 O 4 is a semiconductor with a narrow bandgap of 1.9 eV [3] for bulk material.…”

Section: Introductionmentioning

confidence: 99%

ZnFe2O4 and CuFe2O4 Nanocrystals: Synthesis, Characterization, and Bactericidal Application

et al. 2021

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An easy mechanochemical and eco-friendly method was employed to obtain nanocrystals with an average size of about 9 nm of zinc ferrite (ZnFe 2 O 4 ) and copper ferrite (CuFe 2 O 4 ). Their corresponding X-ray diffraction (XRD) patterns reveal a cubic crystal structure for ZnFe 2 O 4 , whereas in CuFe 2 O 4 the tetragonal and cubic crystal phases coexist, the latter being the majority phase. The transmission electron microscopy (TEM) images of these nano ferrites corroborate the formation of nanocrystals with dimensions consistent with those obtained from the XRD patterns. Furthermore, their corresponding Raman spectra confirm the structure and composition of nano ferrites. In addition, both nano ferrites show an electron paramagnetic resonance (EPR) spectrum with a wide band with g * 2.0, characteristic of ferromagnetic oxides. Besides, the antibacterial effect of ZnFe 2 O 4 and CuFe 2 O 4 nanocrystals against two opportunistic pathogens, Staphylococcus epidermidis (ATCC 14,990) and Pseudomonas aeruginosa (ATCC 43,636), was tested. The minimum bactericidal concentration (MBC) results showed that ZnFe 2 O 4 was more effective against S. epidermidis, while CuFe 2 O 4 was for P. aeruginosa. On the other hand, when 27 mg/mL of nano ferrites were dispersed in the agar plates, the growth of S. epidermidis was 100% inhibited, whereas ZnFe 2 O 4 and CuFe 2 O 4 inhibited 67% and 78% of P. aeruginosa growth, respectively.

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Section: Introductionmentioning

confidence: 99%

ZnFe2O4 and CuFe2O4 Nanocrystals: Synthesis, Characterization, and Bactericidal Application

et al. 2021

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“…Figure 10a, b shows the curve fittings of C 1 s and O 1 s for the samples. Generally, C 1 s region of carbonaceous materials can be deconvoluted into following peaks [67]: carbon in graphite at * 284.5 eV, tetrahedral carbon (sp 3 C-C) at * 285.6 eV [68], [52,70,71]. Combining the XPS survey results shown in Fig.…”

Section: Xpsmentioning

confidence: 99%

Highly efficient nitrogen-doped carbon nanotubes coated on paper-like sintered stainless steel fibers as metal-free structured catalyst for phenol degradation

2020

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Three types of carbon nanotubes coated on paper-like sintered stainless steel fibers (PSSF) were synthesized and applied for continuous catalytic wet hydrogen peroxide oxidation (CWPO) of phenol. The novel metal-free nitrogendoped carbon nanotube-coated PSSF catalyst (N-CNTs/PSSF) was designed by direct chemical vapor deposition using melamine as solid precursor for the first time, and CNTs/PSSF and Fe 2 O 3 -deposited CNTs/PSSF (Fe-CNTs/PSSF) catalysts were synthesized for comparison. Characterization results showed that all the catalysts exhibited three-dimensional networks structure, with nanotubes wrapping on the stainless steel fibers successfully, and the N-CNTs showed distinct irregular corrugated morphology with nitrogen-doping level about 5.18 at.%. CWPO of phenol revealed that the N-CNTs/PSSF catalyst achieved favorable catalytic activity and highest stability during 100-h reaction (phenol and TOC conversions reached about 90% and 50%, respectively), while phenol conversions of CNTs/PSSF and Fe-CNTs/PSSF catalysts decreased over time to 72% and 58%, respectively. The N-CNTs/PSSF catalyst also showed the lowest Fe weight loss ratio (about 2.44 wt%) among the three catalysts. The favorable catalytic results of N-CNTs/PSSF can be ascribed to the synergistic effects of the strong affinity toward polar molecules of N-CNTs, as well as the enhancement in contact efficiency associated with three-dimensional networks structure of the PSSF.

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“…Therefore, it is highly urgent to explore effective methods for the degradation of this organic dye wastewater. At present, the techniques like membrane separation, ozone oxidation, chemical oxidation, photocatalytic degradation, physical adsorption, ion exchange, flotation, electrochemical treatment, coagulation, biochemistry [5][6][7][8][9], have been successfully employed to treat the wastewater caused by dyes.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Structural, Optical, And Photocatalytic Activities Of Cuo/Tio2:Zro2 Catalysts For Degrading Methyl Orange (MO) Dye Under UV–Visible Irradiation.

Bensouyad

Bensaha²

2022

Preprint

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On latest years, an emergency requirement for clean methods to improvement of environment worth has attracted attention in several researches’ fields. The use of films on photocatalysis process is one of the most interesting alternatives due to its easily on separation of residual water and recovery of photocatalyst. In this study, CuO/TiO2:ZrO2 catalysts with various molar ratios of CuO were synthesized by sol-gel dip-coating process. The dip-coated thin films have been examined at different annealing temperatures 500, 800 and 1000 °C. The crystalline structures, morphology, constituent contents, optical and photocatalytic properties of the as-prepared catalysts were analyzed by X–ray diffraction (XRD), Raman spectroscopy, FT-IR spectra, UV-VIS, Photoluminescence spectroscopy (PL) techniques. X-ray diffraction (XRD) and Raman results indicated that an increase in annealing temperature from 500°C to 1000°C caused a transformation of crystallinity from anatase and brookite at 500°C to rutile and monoclinic CuO phases at 1000°C, accompanied by an increase in the particle sizes. The optical transmittance of the films, increased to over 90% in the visible region, indicate that copper loading decreases the band gap from 3.53 to 3.39eV. The PL experiments revealed that the recombination of photoinduced electrons and holes is hindered by copper adding effectively, which is favorable for photocatalytic performance. 5%CuO/TiO2:ZrO2 exhibits the highest photocatalytic activity and the degradation degree of methyl orange (MO) reaches more than 99% after 3h. Photocatalytic experiments confirmed that our catalysts displayed highly efficient and durable activity for the photodegradation of methyl orange under visible light.

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Eco-friendly synthesis of recyclable mesoporous zinc ferrite@reduced graphene oxide nanocomposite for efficient photocatalytic dye degradation under solar radiation

Cited by 75 publications

References 54 publications

ZnFe2O4 and CuFe2O4 Nanocrystals: Synthesis, Characterization, and Bactericidal Application

ZnFe2O4 and CuFe2O4 Nanocrystals: Synthesis, Characterization, and Bactericidal Application

Highly efficient nitrogen-doped carbon nanotubes coated on paper-like sintered stainless steel fibers as metal-free structured catalyst for phenol degradation

Enhanced Structural, Optical, And Photocatalytic Activities Of Cuo/Tio2:Zro2 Catalysts For Degrading Methyl Orange (MO) Dye Under UV–Visible Irradiation.

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