“…9 b exhibits the particles size distribution of NT and NT1. The decrease in the particle size of NT1 compared to NT confirmed lowered agglomeration and also signified improved fluidic stability 50 . Figure 9 ( a ) Variation of Zeta Potential with pH ( b ) DLS pattern of NT and NT1 samples.…”
Section: Resultsmentioning
confidence: 86%
“…9 a. The IEP of NT and NT1 was reported to be 6.2 and 6.5 mV, according to which the increase in the value might be caused due to fluidic stability of NT1 in aqueous suspension 50 . The DLS pattern with respect to Fig.…”
In order to deal with the arising environmental issues across the globe at present nano particles with unique properties laid a benchmark in the name of nano catalysis. In this work the significance of calcination temperature on the thermal, electronic, structural and surface properties of a nano catalyst produced by sol–gel method using ultrasonic radiation against the disposal of toxic textile pollutants is studied in detail. The extract of tea leaves has been used as a bio-template during the synthesis to revise the crystallite size, surface area, optical absorption potential, and rate of agglomeration of nano sized grains by regulating their physico-chemical and surface properties. The influence of calcination in the transformation of single phased anatase titania to mixed phase anatase–rutile titania and the corresponding outcome in its photocatalytic activity employed in water treatment applications have been verified. The nano catalyst obtained is characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transition electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Thermo gravimetric analysis (TGA), Brunaueur Emmett Teller (BET) analysis, UV–Vis diffused reflectance spectroscopy (DRS-UV–Vis) etc. The mesoporosity of the particle was examined using Barrett Joyner Halenda (BJH) model. The enhanced photo catalytic efficiency (about 97.7%) of templated nano titania due to calcination is verified against Congo red, a textile dye under optimized conditions. The nano catalyst produced can be easily separated, recycled to support its economic feasibility.
“…9 b exhibits the particles size distribution of NT and NT1. The decrease in the particle size of NT1 compared to NT confirmed lowered agglomeration and also signified improved fluidic stability 50 . Figure 9 ( a ) Variation of Zeta Potential with pH ( b ) DLS pattern of NT and NT1 samples.…”
Section: Resultsmentioning
confidence: 86%
“…9 a. The IEP of NT and NT1 was reported to be 6.2 and 6.5 mV, according to which the increase in the value might be caused due to fluidic stability of NT1 in aqueous suspension 50 . The DLS pattern with respect to Fig.…”
In order to deal with the arising environmental issues across the globe at present nano particles with unique properties laid a benchmark in the name of nano catalysis. In this work the significance of calcination temperature on the thermal, electronic, structural and surface properties of a nano catalyst produced by sol–gel method using ultrasonic radiation against the disposal of toxic textile pollutants is studied in detail. The extract of tea leaves has been used as a bio-template during the synthesis to revise the crystallite size, surface area, optical absorption potential, and rate of agglomeration of nano sized grains by regulating their physico-chemical and surface properties. The influence of calcination in the transformation of single phased anatase titania to mixed phase anatase–rutile titania and the corresponding outcome in its photocatalytic activity employed in water treatment applications have been verified. The nano catalyst obtained is characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transition electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Thermo gravimetric analysis (TGA), Brunaueur Emmett Teller (BET) analysis, UV–Vis diffused reflectance spectroscopy (DRS-UV–Vis) etc. The mesoporosity of the particle was examined using Barrett Joyner Halenda (BJH) model. The enhanced photo catalytic efficiency (about 97.7%) of templated nano titania due to calcination is verified against Congo red, a textile dye under optimized conditions. The nano catalyst produced can be easily separated, recycled to support its economic feasibility.
“…The X-ray density (ρ x-ray ) of synthesized (NiCuZn)Fe 2 O 4 spinel ferrite nanoparticles at different sonication powers was determined by utilizing the following relation [37] , [38] : …”
Highlights
Crystallites sizes of nanoparticles synthesized via ultrasound irradiation were less than 40nm.
Ms and Hc of nanoparticles obtained at 25℃ were higher than at 50℃ under the same power.
The samples exhibited the highest Ms at 25℃ and the lowest Hc at 50℃ both for 60W.
The ultrasonic irradiation had a positive effect on improving the ferrite magnetic properties.
“…In the field of nanomagnetism, the spinel ferrites are important materials because they exhibit unusual magnetic and electrical properties in comparison with their bulk counterpart [ 4 , [10] , [11] , [12] ]. Nanocrystalline spinel ferrites have been demonstrated as useful material for hyperthermia [ 13 , 14 ], detection of COVID-19 [ 15 ], visible light-enabled photodegradation [ 16 ] and, the catalyst for the synthesis of chalcones [ 17 ]. The molecular formula of spinel-type ferrite is MFe 2 O 4 (M = Co, Ni, Mn, Mg, or other divalent cations) [ 18 ].…”
This paper reports the structural, morphological, spectroscopic, dielectric, ac conductivity, and impedance properties of nanocrystalline Mn
1-x
Zn
x
Fe
2
O
4
. The nanocrystalline Mn–Zn ferrites were synthesized using a solvent-free combustion reaction method. The structural analysis using X-ray diffraction (XRD) pattern reveals the single-phase of all the samples and the Rietveld refined XRD patterns confirmed the cubic-spinel structure. The calculated crystallite size values increase from 8.5 nm to 19.6 nm with the Zn concentration. The surface morphological analysis using field emission scanning electron microscopy and the transmission electron microscopy confirms the nano size of the prepared ferrites. X-ray photoelectron spectroscopy was used to study the ionic state of the atoms present in the samples. Further, the high-resolution Mn 2p, Zn 2p, Fe 2p, and O 1s spectra of Mn
1-x
Zn
x
Fe
2
O
4
does not result in the appearance of new peaks with Zn content, indicating that the Zn substitution does not change the ionic state of Mn, Zn, Fe, and O present in nanocrystalline Mn
1-x
Zn
x
Fe
2
O
4
. The investigated electrical properties show that the dielectric constant, tan δ and ac conductivity gradually decrease with increasing Zn substitution and the sample Mn
0
·
2
Zn
0
·
8
Fe
2
O
4
has the lowest value of conductivity at 303 K. The ac conductivity measured at different temperatures shows the semiconducting nature of the ferrites. The impedance spectra analysis shows that the contribution of grain boundary is higher compared with the grain to the resistance. The obtained results suggest that the Zn substituted manganese ferrite nanoparticles can act as a promising candidate for high-frequency electronic devices applications.
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