Synthesis and characterization of novel Fe@ZnO nanosystem

Dhiman, Pooja; Chand, Jagdish; Kumar, Amit; Kotnala, R.K.; Batoo, Khalid Mujasam; Singh, M.

doi:10.1016/j.jallcom.2013.05.015

Cited by 61 publications

(35 citation statements)

References 20 publications

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“…In fact, visible light contributes more than 50% of the sun irradiation and it is important to fabricate an excellent visible-light response photocatalyst for the practical uses 8 . To improve the performance of ZnO several attempts have been made to shift its absorption band from UV to visible light region such as doping or coupling ZnO with metals, non metals, and metal oxides [9][10][11] . However, the difficulty in separating of those ZnObased photocatalysts from aqueous solutions limits their application in dyes waste water treatment 12 .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Zno-Nife2o4 Magnetic Nanocomposites by Simple Solvothermal Method for Photocatalytic Dye Degradation Under Solar Light

Rahmayeni¹,

Zulhadjri²,

Jamarun³

et al. 2016

Orient. J. Chem

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ZnO-NiFe 2 O 4 magnetic nanocomposite photocatalysts were successfully synthesized by simple solvothermal method using nitric salts as starting materials and ethanol as solvent. The synthesized samples were characterized by XRD, FESEM-EDX, TEM, DRS-UV-vis, VSM, and FTIR instruments. Photocatalytic activity of the samples was evaluated by dye degradation under solar light irradiation. The results show that the diffraction peaks of nanocomposites correspond to the hexagonal wurzite of ZnO and spinal cubic structure of NiFe 2 O 4 . The microstructure studies revealed that nanocomposites were dominated by granular-like of ZnO nanoparticles were synthesized at 180°C and rod-like at 200°C. The estimated band gap value of ZnO-NiFe 2 O 4 (1:0.01) nanocomposites is 2.78 eV which is lower than ZnO. The magnetic saturation (Ms) result showed a superparamagnetic behavior for nanocomposites. It was found that the photocatalytic activity of synthesized nanocomposites were higher than ZnO and NiFe 2 O 4 .

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Section: Introductionmentioning

confidence: 99%

Synthesis of Zno-Nife2o4 Magnetic Nanocomposites by Simple Solvothermal Method for Photocatalytic Dye Degradation Under Solar Light

Rahmayeni¹,

Zulhadjri²,

Jamarun³

et al. 2016

Orient. J. Chem

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“…Dhiman et al Photocatalytic activity of undoped ZnO is generally attributed to two kinds of states: (1) The donor states formed by the large number of defect sites such as oxygen vacancies and interstitial zinc atoms; (2) the acceptor states formed by zinc vacancies and interstitial oxygen atoms. Dhiman et al [17] assume that the interfacial electron transfer takes place predominantly between these donor states (oxygen vacancies and interstitial Zn atom) and Methylene Blue. Being a cationic dye, Methylene Blue acquires electrons from excited donor states and decomposes.…”

Section: Photocatalytic Activity Study and Discussionmentioning

confidence: 99%

“…Sci. 2017, 7, 1185 7 of 11 [17] In fact, the Fe-doping of ZnO NWs allows the substitution of a few Zn atoms by Fe atoms, resulting in the creation of other energy levels above VB and below CB of ZnO (Figure 7) [18], leading to a reduction of the gap, then allowing the semiconductor to harvest more photons during the photocatalysis process. In addition, the introduction of iron leads to the formation of additional defects in the ZnO crystal lattice [19], which can become electron traps, reduces the recombination probability of the electron-hole pairs and leads to an acceleration of the formation of hydroxyl radicals.…”

Section: Photocatalytic Activity Study and Discussionmentioning

confidence: 99%

“…By using the Tauc plot [15], a red shift (narrowing of band gap) is observed for Fe-doped ZnO (Figure 4b). This red shift is the common result in the transition-metal doped ZnO, due to sp-d exchange interactions between the ZnO band electrons and the localized "d" electrons of the transition-metal doped in the semiconductor matrix [16,17]. In this case, "s-d" and "p-d" exchange interactions lead to a negative correction to the CB edge and a positive correction to the VB edge of the ZnO matrix leading to a band gap narrowing.…”

Section: Fe-doped Zno Nanowire Synthesismentioning

confidence: 94%

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Enhanced Photocatalytic Activity of Iron-Doped ZnO Nanowires for Water Purification

2017

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Abstract:In order to improve the photocatalytic efficiency of ZnO nanowires, iron-doped ZnO nanowires (ZnO:Fe NWs) were successfully synthesized. The morphology, optical properties and photocatalytic performance of ZnO:Fe NWs were studied by scanning electron microscopy (SEM), UV-Visible spectrophotometry and photoluminescence spectroscopy (PL), respectively. The SEM observations showed that the morphology of the ZnO NWs was not modified by iron doping, but the band gap was reduced from 3.29 eV for ZnO NWs to 3.25 eV for ZnO:Fe NWs. This band gap reduction allows the semiconductor to harvest more photons to excite more electrons in the valence band; subsequently, resulting in an improvement of the degradability of the understudied organic dyes: methylene blue (MB), methyl orange (MO), and acid red 14 (AR14). The photocatalytic study showed that the photo-degradation rate of the MB, MO, and AR14 was improved 9%, 20%, and 5% respectively by 1% iron doping in the ZnO NWs.

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“…Therefore, in tropical countries which possess water environment problems, particularly by dye pollution, this material offers a promising solution for environmental issues. Some researchers have made various modifications such as doped with metal 6,7 , nonmetallic 8 , metal/carbon 9 , and metal oxides 10 . However, the photocatalysts are still difficult to separate from the liquid for the subsequence process 11 .…”

Section: Introductionmentioning

confidence: 99%

Magnetically Separable ZnO-MnFe2O4 Nanocomposites Synthesized in organic-free Media for dye Degradation Under Natural Sunlight

Rahmayeni¹,

Arief²,

Jamarun³

et al. 2017

Orient. J. Chem

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Magnetically separable ZnO-MnFe 2 O 4 nanocomposites were synthesized in organic-free media. The samples were characterized by several techniques. The photocatalytic activities of the nanocomposites were tested by degradation of Rhodamine B and wastewater of batik dye under natural sunlight irradiation. X-ray diffraction (XRD) pattern of composites is well in agreement with the standard of the hexagonal wurtzite phase of ZnO and spinel cubic phase of MnFe 2 O 4 . Scanning Electron Microscope (SEM) image illustrates the morphology of the nanocomposites are square plate-like and porous. The magnetic properties of composites were characterized by Vibrating Sample Magnetometer (VSM) show the superparamagnetic properties of all nanocomposites. Optical properties study indicated that addition of MnFe 2 O 4 to ZnO decreases the band gap. The removal of Rhodamine B (10 mg L −1 ) and wastewater of batik dye solution by ZnO-MnFe 2 O 4 (1:0.1) composite after 3 h reached 96.7% and 95.1 %.

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Synthesis and characterization of novel Fe@ZnO nanosystem

Cited by 61 publications

References 20 publications

Synthesis of Zno-Nife2o4 Magnetic Nanocomposites by Simple Solvothermal Method for Photocatalytic Dye Degradation Under Solar Light

Synthesis of Zno-Nife2o4 Magnetic Nanocomposites by Simple Solvothermal Method for Photocatalytic Dye Degradation Under Solar Light

Enhanced Photocatalytic Activity of Iron-Doped ZnO Nanowires for Water Purification

Magnetically Separable ZnO-MnFe2O4 Nanocomposites Synthesized in organic-free Media for dye Degradation Under Natural Sunlight

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