One-Pot Flash Combustion Synthesis, Structural, Morphological and Opto-Magnetic Properties of Spinel Mn x Co1−x Al2O4 (x = 0, 0.3, and 0.5) Nanocatalysts

Manikandan, A.; Durka, M.; Antony, S. Arul

doi:10.1007/s10948-014-2841-4

Cited by 60 publications

(20 citation statements)

References 37 publications

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“…In general, a high specific surface area has a favorable effect on the activity for photocatalysts. Thus, the higher surface area of the sample LaMgFe-4 may lead to higher PCD efficiency (90.53 %) than other samples [39,49,55]. In addition, the amount of the dispersion of particles per volume in the solution will increase, which results in the enhancement of the photon absorbance [41,45,56].…”

Section: Photocatalytic Propertiesmentioning

confidence: 99%

“…It can be easily recovered by applying external magnetic field and reused several times. Our research group has reported photocatalytic degradation (PCD) of 4-chlorophenol (4-CP) and methylene blue (MB) using spinel ferrites and metal sulfides nanocatalysts [40][41][42][43][44][45][46][47][48][49]. However, to the best of our knowledge, there is no literature available for the PCD of methylene blue by LaMg x Fe 1−x O 3−δ nano-photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic Properties and Humidity-Sensing Studies of Magnetically Recoverable LaMg x Fe1−x O 3−δ Perovskites Nano-photocatalysts by Sol-Gel Route

Teresita¹,

Manikandan

Josephine³

et al. 2016

J Supercond Nov Magn

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115

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Nanostructured perovskite mixed metal oxides, LaMg x Fe 1−x O 3−δ (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0), were synthesized successfully by a simple sol-gel route. The formation of single-phase perovskite oxides structure was confirmed by powder X-ray diffraction (XRD) analysis. The average crystallite size of the samples was evaluated using Sherrer's formula. The presence of functional groups and metal oxide bonds was confirmed by Fourier transform infrared (FT-IR) analysis. Brunauer-Emmett-Teller (BET) surface adsorption studies showed better surface area of the compositions, which was further, evidenced by scanning electron microscopy (SEM) analysis. Room temperature vibrating sample magnetometer (VSM) analysis was confirmed that the superparamagnetic nature and the magnetization values decreased with increase in Mg-dopant. The samples were subjected to dc electrical conductivity studies at room temperature. The dc resistance measurements as a function of relative humidity (RH) at 5, 31, 51, 79, and 98 % were carried out on sintered discs at 25 • C under static conditions, which sensitivity factor S f (R 5% / R 95% ) A. Manikandan were calculated for LaMg x Fe 1−x O 3−δ . The temperaturedependent conductance was also carried out in the range of 100-300 • C as suggested, and the activation energy was determined. Sample LaMgFe-4 (x = 0.6) possessed the highest humidity-sensing factor (12,926.03 ± 387), while LaFeO 3 (x = 0) possessed the lowest sensitivity factor (41.66 ± 3). The response and recovery characteristics were studied for LaMgFe-4, which exhibited a very good narrow hysteresis loop. The photocatalytic degradation (PCD) of methylene blue (MB) dye was investigated under UVvisible light and the sample LaMgFe-4 showed better PCD efficiency than other samples, due to the smaller particle size and higher surface area.

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Section: Photocatalytic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electromagnetic Properties and Humidity-Sensing Studies of Magnetically Recoverable LaMg x Fe1−x O 3−δ Perovskites Nano-photocatalysts by Sol-Gel Route

Teresita¹,

Manikandan

Josephine³

et al. 2016

J Supercond Nov Magn

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115

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“…When the peak pattern exhibits a sharp and narrow shape, the average crystallite size is generally larger according to the Scherrer equation (Bhat I et al 2013;Manikandan A et al 2014), which is:…”

Section: Cu-doped Catalysts Xrd Analysismentioning

confidence: 99%

Combined promoting effects of low-Pd-containing and Cu-doped LaCoO3 perovskite supported on cordierite for the catalytic combustion of benzene

Chen

Niu

et al. 2016

Environ Sci Pollut Res

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The catalytic activities for benzene oxidation and resistance to SO2 poisoning were tested for a series of Pd/La-Cu-Co-O/cordierite catalysts, which were prepared using a multiple-step impregnation method. The XRD, SEM, and IR characterization techniques were performed to investigate the relationship between the catalytic performance and its physicochemical properties. When Pd/La-Cu-Co-O/cordierite catalysts with Pd loadings of 0.06 and 0.08 % were prepared at a calcination temperature of 500 °C for 5 h, they exhibited similar catalytic activity and sulfur resistance. When the concentration of benzene was 1500 ppm and the GHSV was 20000 h(-1), the benzene conversion was above 95 % at a reaction temperature of 350 °C in SO2 existing at 100 ppm. These results were mainly attributed to the cooperation between La-Cu-Co-O perovskite and the noble metal Pd. Specifically, the addition of copper can strengthen the catalytic activity of La-Co-O/cordierite catalysts by decreasing the crystalline size of the active ingredients. A moderate Pd addition can drastically improve the sulfur resistance and further improve the catalytic activity of the La-Cu-Co-O/cordierite catalyst.

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“…For the comparative study purpose, it was also prepared by a modified sol-gel method (SGM). Nowadays, the plant extracted MHM route has fascinated a significant interest in fabricating the homogeneous, nanosized functional materials, because of its cheap and inexpensive precursors and short preparation time [17]. Compare to MHM route, the SGM methods have some disadvantageous such as required long time and high temperature for calcinations to complete final products and low production rates.…”

Section: Introductionmentioning

confidence: 99%

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

Manikandan

Durka²,

Antony

2015

J Inorg Organomet Polym

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Spinel CuFe 2 O 4 nano-and microstructures were synthesized by a simple, economical and eco-friendly microwave heating (MHM) and modified sol-gel methods (SGM) using metal nitrates and Hibiscus rosa-sinensis leaf extracted solution, instead of toxic inorganic/organic catalyst, template and surfactant. Powder XRD, FT-IR, EDX and SAED results were confirmed that the as-synthesized products have a single-phase spinel structure with high crystallinity and without the presence of any other secondary phase impurities. The morphology of the samples was revealed by HR-SEM and HR-TEM techniques show that the MHM and SGM products consist of nano-and microstructures, respectively, and their possible formation mechanisms were also proposed. The optical band gap (E g ) was measured using Kubelka-Munk model and it shows higher value (2.35 eV) for CuFe 2 O 4 -MHM than CuFe 2 O 4 -SGM (2.18 eV), due to the smaller particle size of CuFe 2 O 4 -MHM. The magnetic property of the samples showed a ferromagnetic behavior and the magnetization (M s ) value of CuFe 2 O 4 -MHM is higher i.e. 61.13 emu/g than CuFe 2 O 4 -SGM (57.25 emu/g). Both the samples were successfully tested as catalysts for the conversion of benzylic alcohols to respective carbonyls using H 2 O 2 (as oxidant) and acetonitrile (as a solvent) catalytic system. It was found that the CuFe 2 O 4 -MHM catalyst show best performance of conversion of aromatic alcohols into aldehydes than that of CuFe 2 O 4 -SGM. Spinel CuFe 2 O 4 catalyst is magnetically recyclable and could be reused with no significant loss in catalytic activity as proved for five consecutive cycles.

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One-Pot Flash Combustion Synthesis, Structural, Morphological and Opto-Magnetic Properties of Spinel Mn x Co1−x Al2O4 (x = 0, 0.3, and 0.5) Nanocatalysts

Cited by 60 publications

References 37 publications

Electromagnetic Properties and Humidity-Sensing Studies of Magnetically Recoverable LaMg x Fe1−x O 3−δ Perovskites Nano-photocatalysts by Sol-Gel Route

Electromagnetic Properties and Humidity-Sensing Studies of Magnetically Recoverable LaMg x Fe1−x O 3−δ Perovskites Nano-photocatalysts by Sol-Gel Route

Combined promoting effects of low-Pd-containing and Cu-doped LaCoO3 perovskite supported on cordierite for the catalytic combustion of benzene

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

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