Study on the Preparation of Nano Fe3O4 Powder and its Properties

2012 ◽  
Vol 178-181 ◽  
pp. 562-565
Author(s):  
Rui Cui Liu ◽  
Fu Yi Jiang ◽  
Zi Quan Liu
Keyword(s):  
Catalytic Activity ◽  
Rhodamine B ◽  
Catalytic Degradation ◽  
Model Reaction ◽  
Iron Chloride ◽  
Precipitation Method ◽  
Photo Catalytic Activity ◽  
Powder Samples ◽  
Nano Fe3o4 ◽  
Co Precipitation

The experiment used iron chloride, iron dichloride and other agents as the main resources to prepare the nano Fe3O4 powder by co-precipitation method. Magnets were used to test the magnetism of the prepared nano Fe3O4 powder samples. And the photo-catalytic degradation of rhodamine B solution was used as the model reaction to test the photo-catalytic activity of the prepared nano Fe3O4 powder. The results showed that the prepared nano Fe3O4 powder samples had good magnetism but low photo-catalytic activity.

scholarly journals Kinetic Studies on the Catalytic Degradation of Rhodamine B by Hydrogen Peroxide: Effect of Surfactant Coated and Non-Coated Iron (III) Oxide Nanoparticles

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2246
Author(s):  
Mohd Shaban Ansari ◽  
Kashif Raees ◽  
Moonis Ali Khan ◽  
M.Z.A. Rafiquee ◽  
Marta Otero
Keyword(s):  
Electron Microscopy ◽  
Hydrogen Peroxide ◽  
Rhodamine B ◽  
Sodium Dodecyl ◽  
Kinetic Studies ◽  
Catalytic Degradation ◽  
Precipitation Method ◽  
Order Kinetic ◽  
Fe3o4 Nps ◽  
Co Precipitation

Iron (III) oxide (Fe3O4) and sodium dodecyl sulfate (SDS) coated iron (III) oxide (SDS@Fe3O4) nanoparticles (NPs) were synthesized by the co-precipitation method for application in the catalytic degradation of Rhodamine B (RB) dye. The synthesized NPs were characterized using X-ray diffractometer (XRD), vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infra-red (FT-IR) spectroscopy techniques and tested in the removal of RB. A kinetic study on RB degradation by hydrogen peroxide (H2O2) was carried out and the influence of Fe3O4 and SDS@Fe3O4 magnetic NPs on the degradation rate was assessed. The activity of magnetic NPs, viz. Fe3O4 and SDS@Fe3O4, in the degradation of RB was spectrophotometrically studied and found effective in the removal of RB dye from water. The rate of RB degradation was found linearly dependent upon H2O2 concentration and within 5.0 × 10−2 to 4.0 × 10−1 M H2O2, the observed pseudo-first-order kinetic rates (kobs, s−1) for the degradation of RB (10 mg L−1) at pH 3 and temperature 25 ± 2 °C were between 0.4 and 1.7 × 104 s−1, while in presence of 0.1% w/v Fe3O4 or SDS@Fe3O4 NPs, kobs were between 1.3 and 2.8 × 104 s−1 and between 2.6 and 4.8 × 104 s−1, respectively. Furthermore, in presence of Fe3O4 or SDS@Fe3O4, kobs increased with NPs dosage and showed a peaked pH behavior with a maximum at pH 3. The magnitude of thermodynamic parameters Ea and ΔH for RB degradation in presence of SDS@Fe3O4 were 15.63 kJ mol−1 and 13.01 kJ mol−1, respectively, lowest among the used catalysts, confirming its effectiveness during degradation. Furthermore, SDS in the presence of Fe3O4 NPs and H2O2 remarkably enhanced the rate of RB degradation.

Synthesis, Characterization and Photocatalytic activity of Tin oxide Nano-crystals

2020 ◽  
Vol 16 ◽  
Author(s):  
Shatendra Sharma ◽  
Monika Vats ◽  
Jyotsna Sharma ◽  
Arvind Chhabra ◽  
R. K. Rakesh Kumar ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Catalytic Activity ◽  
Band Gap ◽  
Sodium Carbonate ◽  
Tin Oxide ◽  
Nano Particles ◽  
Precipitation Method ◽  
Storage Devices ◽  
Photo Catalytic Activity ◽  
Co Precipitation

Background: Tin oxide nano-particles also show good photo-catalytic efficiency because of its wide band gap and high recombination rates of photo-generated electron-hole pairs. Being non-toxic and chemically stable, the tin oxide nano-particles are used as dynamic photo-catalyst for the degradation. Tin oxide nano-crystals suitable for charge storage devices are synthesized using co-precipitation technique. Objectives: Synthesis of Tin oxide nano-crystals by using co-precipitation method for photo-catalytic activity under sunlight that can be used for photo-degradation. The method of synthesis and characterization are discussed. Materials and Methods: The nano-crystals are prepared by co-precipitation method using stannic chloride and sodium carbonate. sodium carbonate is added under constant stirring drop by drop for 90 minutes. The solution is settled for 4 hours. The precipitates are first washed using de-ionized water and then with ethyl alcohol. The dried powder of nanocrystals is then calcinated at 500oC for one hour in a muffle furnace. The structural, morphological, optical and electrical characterization of these synthesized crystals is done using (XRD), (FESEM), (TEM), (UV-Visible), (FT-Raman), Zeta potential and dielectric constant measurements. Results and Discussion: The sizes of synthesized nano-crystals vary from 25 nm to 100 nm and are found to be optically transparent. The dielectric constant of nano-crystals is measured in the frequency range of 100Hz-1MHz and it can be seen that it declines from ~2000 at frequency 100Hz to ~30 at 1MHz.However, this decline in dielectric constant with frequency can be explained well on the basis of strong space charge polarization and rotational direction polarization processes in nanostructures. In the high frequency regions, these processes cannot follow the electrical field frequency variations that results in the rapid decrease of dielectric constant. Photo-catalytic activity: The photo-catalytic activity of the particles under sun light is also investigated which shows that the crystals show degradation of the methylene blue dye under sunlight irradiation. Theoretical investigations with DFT: The band gap of the particles is also calculated from the UV-VIS spectra which is found to be ~3.6 eV and this experimentally observed value of band gap matches with that calculated theoretically from Density Functional Theory (DFT) using Local Density Approximation (LDA). Conclusion: The method of synthesis reported in the present paper is scalable and can be used for commercial synthesis of SnO2 nano-crystals for electrodes and energy storage devices.

Visible light photo-catalytic activity of C-PVA/TiO2 composites for degrading rhodamine B

2015 ◽  
Vol 324 ◽  
pp. 645-651 ◽  
Author(s):  
Haigang Yang ◽  
Jianling Zhang ◽  
Yuanqing Song ◽  
Shoubin Xu ◽  
Long Jiang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Photo Catalytic Activity

High Catalytic Activity and Stability of Hexaaluminate Catalysts for N2O Decomposition

2013 ◽  
Vol 320 ◽  
pp. 665-669
Author(s):  
Chao Zhang ◽  
Yong Ji Song ◽  
Feng Hua Shi ◽  
Cui Qing Li ◽  
Hong Wang
Keyword(s):  
Catalytic Activity ◽  
Decomposition Reaction ◽  
Precipitation Method ◽  
High Catalytic Activity ◽  
Structure And Properties ◽  
Active Components ◽  
Co Precipitation ◽  
Hexaaluminate Catalysts

In this paper, hexaaluminate oxides LaMAl12O19-σwere prepared by using M=Cu ,Ce and Zn as active components to substitute Al in the hexaaluminate lattice by co-precipitation method. The structure and properties of LaMAl11O19-σcatalyst was characterized with XRD and BET. The results showed LaCuAl11O19-σexhibited significant high catalytic activity for the decomposition reaction of N2O. Under the simulated in situ condition, LaCuAl11O19-σalso indicated significant catalytic activity and stability, with N2O conversion of 90% at 635°C.

Nanoscale zero-valent iron incorporated with nanomagnetic diatomite for catalytic degradation of methylene blue in heterogeneous Fenton system

2016 ◽  
Vol 73 (11) ◽  
pp. 2815-2823 ◽  
Author(s):  
Yiming Zha ◽  
Ziqing Zhou ◽  
Haibo He ◽  
Tianlin Wang ◽  
Liqiang Luo
Keyword(s):  
Methylene Blue ◽  
Chemical Reduction ◽  
Nitrogen Adsorption ◽  
Catalytic Degradation ◽  
Zero Valent Iron ◽  
Precipitation Method ◽  
Heterogeneous Fenton ◽  
Nanoscale Zero Valent Iron ◽  
Co Precipitation ◽  
Fenton System

Nanoscale zero-valent iron (nZVI) incorporated with nanomagnetic diatomite (DE) composite material was prepared for catalytic degradation of methylene blue (MB) in heterogeneous Fenton system. The material was constructed by two facile steps: Fe3O4 magnetic nanoparticles were supported on DE by chemical co-precipitation method, after which nZVI was incorporated into magnetic DE by liquid-phase chemical reduction strategy. The as-prepared catalyst was characterized by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray diffraction, magnetic properties measurement and nitrogen adsorption–desorption isotherm measurement. The novel nZVI@Fe3O4-diatomite nanocomposites showed a distinct catalytic activity and a desirable effect for degradation of MB. MB could be completely decolorized within 8 min and the removal efficiency of total organic carbon could reach to 90% after reaction for 1 h.

scholarly journals Facile synthesis of a high purity α-MnO2 nanorod for rapid degradation of Rhodamine B

2021 ◽  
Author(s):  
shumin wang ◽  
Ao Guan ◽  
Jiahan Wang ◽  
Xiaofang Fu ◽  
Xiang Guo ◽  
...  
Keyword(s):  
Rhodamine B ◽  
High Efficiency ◽  
Catalytic Mechanism ◽  
Ph Value ◽  
Removal Rate ◽  
Precipitation Method ◽  
Characteristic Peak ◽  
Catalytic Stability ◽  
Rapid Removal ◽  
Co Precipitation

Abstract Manganese dioxide (α-MnO2) nanorods with diameters of about 5-15 nm and lengths of 100-150 nm were synthesized by a simple co-precipitation method. XRD, TEM, HRTEM, SAED and XPS were used to analyze the crystallographic information, microstructure and chemical bonding of the as-prepared sample. The α-MnO2 nanorod exhibited a high efficiency and rapid removal rate of rhodamine B (RhB), which reached about 97.5% within 10 min when pH=4 (and pH=6.6) and 97.7% within 50 min when pH = 9 in the presence of H2O2. The results also indicated that a lower pH value is conducive to the movement of the characteristic peak and the attenuation of the intensity of the characteristic peak of RhB dye. Then a possible catalytic mechanism was revealed. Moreover, the α-MnO2 nanorod exhibits an excellent recyclability and catalytic stability. This research indicates that α-MnO2 nanorods have a potential application in practical dye pollutant treatment.

scholarly journals PHOTOCATALYTIC DEGRADATION OF RHODAMINE B USING Ag NANO DOPED TiO2 PREPARED BY -IRRADIATION METHOD

2016 ◽  
Vol 54 (4) ◽  
pp. 494
Author(s):  
Vo Thi Thu Nhu ◽  
Nguyen Ngoc Duy ◽  
Huynh Nguyen Anh Tuan ◽  
Nguyen Pham Tu Ngan ◽  
Do Quang Minh ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Rhodamine B ◽  
Bet Surface Area ◽  
Nano Tio2 ◽  
Photo Catalyst ◽  
Photo Catalytic Activity ◽  
Transmission Electron ◽  
Degussa P25 ◽  
Area X

Ag nano deposited on TiO2 (Degussa P25) (Ag nano/TiO2) photo-catalyst has been synthesized by g-irradiation method. The  characteristics  of  Ag nano/TiO2 material  has  been  investigated  by BET surface area, X-ray diffraction (XRD), transmission electron microscopy (TEM) and the diffuse reflectance spectra (DRS). The photo-catalytic properties of Ag nano/TiO2 for degradation of Rhodamine B in aqueous solution under visible light have been studied. Results indicated that Ag nano/TiO2 photo-catalyst exhibited better photo-catalytic activity compared to that of TiO2 under the same reaction condition. The higher activity of Ag nano/TiO2 is due the enhancement of electron–hole separation effect on the surface of the catalyst. At 1.5% Ag doping content, the Ag nano/ TiO2 photo-catalyst exhibited the highest photo-catalytic activity under visible light.

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