Structural, optical, dielectric and magnetic properties of Mn1−xCoxO2 nanowires

Stella, C.; Soundararajan, N.; Ramachandran, K.

doi:10.1016/j.spmi.2014.03.044

Cited by 22 publications

(5 citation statements)

References 26 publications

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“…This creates a new vibrational frequency mode. The bands at 530 cm −1 for Mn 10 and 620 cm −1 for Mn 5 correspond to the stretching and bending vibration of Mn-O bonds, respectively [14,38]. The shift of most of the absorption peaks towards the higher energy region can be attributed to the change in the bond length due to the Mn-doping and the replacement of Zn ions.…”

Section: Optical Propertiesmentioning

confidence: 97%

Green synthesis of Mn_xZn_(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Barman¹,

Sikdar²,

Biswas³

et al. 2022

Phys. Scr.

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Zinc Oxide (ZnO) nanostructure doped with manganese (Mn: 5% and 10%) were prepared by the green synthesis method using the leaf extracts of Azadirachta indica. The microstructural investigation of the prepared nanopowders was carried out with the Rietveld refinement of the X-ray diffraction data. The phase analysis of the X-ray diffraction data confirmed that the synthesized nanoparticles have the hexagonal wurtzite structure in all cases. The Williamson Hall method was used to analyze the data obtained after the Rietveld refinement analysis to find some important microstructural parameters such as crystallite size, strain, stress and energy density. The size of the crystallites is almost the same in both cases and the values for strain, stress, and energy density increase with increasing Mn concentration. Functional groups and molecular interactions were identified by the Fourier Transform Infra-Red spectroscopy spectra. UV-visible spectra show that the band gap energy decreases with increasing Mn content. This property can help to fabricate a photodetector that can operate at a wavelength longer than the cut-off wavelength of ZnO. The morphology of the synthesized nanostructure was studied by field emission scanning electron microscope. The energy dispersive X-ray spectroscopy data confirm the elemental compositions in the synthesized Mn-doped ZnO, which means that the desired nanostructures were successfully synthesized by the green method.

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Section: Optical Propertiesmentioning

confidence: 97%

Green synthesis of Mn_xZn_(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Barman¹,

Sikdar²,

Biswas³

et al. 2022

Phys. Scr.

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“…The bands centered at around 565 and 660 cm –1 (with shoulders at higher frequencies) are typical of the Co 3 O 4 spinel phase, corresponding to the vibrations of tetrahedral Co 3+ –O and octahedral Co 2+ –O in MnCO 3 O x , Ru/MnCO 3 O x , and Ru/Co 3 O 4 catalysts, respectively . In addition, the Mn–O bond can be detected at 528 and 610 cm –1 intervals in Ru/MnO x , but no characteristic bands of Mn–O vibrations can be detected over MnCo 3 O x and Ru/MnCo 3 O x materials. , …”

Section: Resultsmentioning

confidence: 96%

Engineering Ru/MnCo₃O_x for 1,2-Dichloroethane Benign Destruction by Strengthening C–Cl Cleavage and Chlorine Desorption: Decisive Role of H₂O and Reaction Mechanism

et al. 2022

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Effective desorption of chlorine species is critical for hindering the formation of chlorinated intermediates in the catalytic destruction of chlorinated volatile organic compounds (CVOCs). Here, Ru/MnCo3O x catalysts with excellent activity, reaction durability and superior chlorine transformation ability for 1,2-dichloroethane (1,2-DCE) destruction were rationally fabricated. The presence of Ru facilitates the electron transfer among Ru, Mn, Co, and O species, forming larger amounts of Ru6+/Ru4+, Mn4+, Co2+, and active oxygen species (O2–), and therefore promoting the catalytic activity via accelerating and strengthening the cleavage of the C–Cl bond at low temperatures. However, Ru species plays a neutral role in the desorption of surface chlorine species under dry conditions and the polychlorinated byproducts such as CH2Cl2, CHCl3, CCl4, CH2ClCHCl2, and CHClCCl2 are inevitably formed. Interestingly, the desorption of chlorine species over Ru-based catalysts can be dramatically promoted under humid conditions, suppressing the formation of hazardous polychlorinated byproducts effectively (over 3 times lower under 2 vol % of water vapor conditions than the dry conditions). Results reveal that the presence of Ru enables Cl species transformation and dissociation over the catalyst surface that fosters the destruction of 1,2-DCE on adjacent Mn/Co sites under humid conditions, providing a rationale for high catalytic activity of the catalysts and paving the way for industrially relevant CVOC benign destruction.

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“…After the adsorption process, the same peak still appeared at adjacent wavenumbers, namely 542.8 and 541.6 cm -1 but with different intensities. Another study reported that the Mn-O bonds detected at wavenumbers 462, 520, and 702 cm -1 are due to its vibrations [Stella et al, 2014]. On the basis of the results, the CaO/Fe 3 O 4 composite after adsorption of Mn(II) ion had peaks at wavenumbers 449.4, 545.7, and 709.4 cm -1 .…”

Section: Ftir Characterization Before and After Adsorptionmentioning

confidence: 83%

Modification of Calcium Oxide from Green Mussel Shell with Iron Oxide as a Potential Adsorbent for the Removal of Iron and Manganese Ions from Acid Mine Drainage

Purwaningrum¹,

Hasanudin²,

Rachmat³

et al. 2022

J. Ecol. Eng.

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Acid mine drainage (AMD) has the characteristics of high heavy metal ion content and low pH. This study aimed to synthesize the CaO/Fe 3 O 4 composite for the adsorption of iron and manganese ions from acid mine drainage. CaO was synthesized from the shells of green mussels (Perna viridis). The CaO/Fe 3 O 4 composites were characterized using XRD, BET surface area, SEM-EDS, and VSM. The functional groups of the composite before and after adsorption were analyzed using FTIR. The adsorption of Fe(II), Fe(III), and Mn(II) ions was carried out with the batch method to determine the effect of pH, contact time, and initial concentration of metal ions. The CaO/Fe 3 O 4 composite has magnetic properties, as indicated by the saturation magnetization value of 65.49 emu/g. The Langmuir and Freundlich isotherm models were used to describe the adsorption isotherm of the composite for Fe(II), Fe(III), and Mn(II) ions. Investigations were also conducted on adsorption kinetics, including pseudo-first-order and pseudo-second-order, as well as adsorption thermodynamics comprising free energy, enthalpy, and entropy. Pseudofirst-order and Langmuir isotherms are suitable to describe the adsorption of Fe(II), Fe(III), and Mn(II) ions with adsorption capacities of Fe(III) > Fe(II) > Mn(II). Moreover, the adsorption of all ions using the composite occurred spontaneously. The removal effectiveness for Fe and Mn ions from AMD using CaO/Fe 3 O 4 composite, reached 90.41 and 97.59%, respectively, in volume 100 mL AMD, composite mass 0.4 g, and a contact time of 60 minutes.

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Structural, optical, dielectric and magnetic properties of Mn1−xCoxO2 nanowires

Cited by 22 publications

References 26 publications

Green synthesis of Mn_xZn_(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Green synthesis of Mn_xZn_(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Engineering Ru/MnCo₃O_x for 1,2-Dichloroethane Benign Destruction by Strengthening C–Cl Cleavage and Chlorine Desorption: Decisive Role of H₂O and Reaction Mechanism

Modification of Calcium Oxide from Green Mussel Shell with Iron Oxide as a Potential Adsorbent for the Removal of Iron and Manganese Ions from Acid Mine Drainage

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Structural, optical, dielectric and magnetic properties of Mn1−xCoxO2 nanowires

Cited by 22 publications

References 26 publications

Green synthesis of MnxZn(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Green synthesis of MnxZn(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Engineering Ru/MnCo3Ox for 1,2-Dichloroethane Benign Destruction by Strengthening C–Cl Cleavage and Chlorine Desorption: Decisive Role of H2O and Reaction Mechanism

Modification of Calcium Oxide from Green Mussel Shell with Iron Oxide as a Potential Adsorbent for the Removal of Iron and Manganese Ions from Acid Mine Drainage

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Green synthesis of Mn_xZn_(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Green synthesis of Mn_xZn_(1−x)O nanostructure using Azadirachta indica leaf extract and its microstructural and optical study

Engineering Ru/MnCo₃O_x for 1,2-Dichloroethane Benign Destruction by Strengthening C–Cl Cleavage and Chlorine Desorption: Decisive Role of H₂O and Reaction Mechanism