Preparation, Characterization and Catalytic Properties of the Different Types of Nanometer Crystal Manganese Dioxide

2011 ◽  
Vol 287-290 ◽  
pp. 708-711
Author(s):  
De Qing Chu ◽  
Yun Na Dong ◽  
Zhi Ri Yu ◽  
Liang Ci Su ◽  
Li Min Wang
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Manganese Dioxide ◽  
Degradation Rate ◽  
Catalytic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Types ◽  
Nano Crystal ◽  
Scanning Electron

The different types of nanometer crystal manganese dioxides was prepared by hydrothermal method, and was characterized by scanning electron microscopy and X-ray diffraction. Meanwhile, the catalytic properties of the samples were investigated in catalytic degradation of methylene blue. The results showed that the different types of nano-crystal manganese dioxide had uniform crastallinity and good dispersion. And the degradation rate of methylene blue has reached more than 60%.

scholarly journals Borax-Cross-Linked Guar Gum-Manganese Dioxide Composites for Oxidative Decolorization of Methylene Blue

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Rohan S. Dassanayake ◽  
Erandathi Rajakaruna ◽  
Noureddine Abidi
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Manganese Dioxide ◽  
Guar Gum ◽  
Spectrophotometric Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Decolorization Efficiency ◽  
Desorption Mechanism ◽  
Scanning Electron

Borax-cross-linked guar gum-manganese dioxide (GGB-MnO2) composite was synthesized using an environmentally friendly synthesis route and investigated for its efficiency of decolorizing methylene blue (MB) dye solution by an ultraviolet-visible (UV-Vis) spectrophotometric study. The GGB-MnO2 composite was characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive X-ray (EDX) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, and thermogravimetric analysis (TGA). The composite (1.2 g/L) exhibited excellent oxidative decolorization of MB (30 mg/L, 50 mL) solution to over 99% in 6, 13, and 40 min at pH 4, 7, and 10, respectively. The complete decolorization of MB occurred via a catalytic adsorption-oxidation-desorption mechanism. The GGB-MnO2 composite showed very good reusability and was stable after ten successive cycles with negligible losses of the decolorization efficiency.

Low Temperature Hydrothermal Synthesis of 3D-MnO2 Nanostructures and their Catalytic Properties over MB

2013 ◽  
Vol 448-453 ◽  
pp. 730-733
Author(s):  
Si Liang Li ◽  
Ya Jie Guo ◽  
Jing Juan Pu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Methylene Blue ◽  
Catalytic Properties ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
X Ray ◽  
Facile Hydrothermal Route ◽  
Scanning Electron

A novel three-dimensional MnO2 catalyst have been successfully prepared by a facile hydrothermal route. They were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, they showed excellent catalytic activity over the aqueous degradation of methylene blue (MB).

Wool supported manganese dioxide nano-scale dispersion: a biopolymer based catalyst for the aerobic oxidation of organic compounds

RSC Advances ◽  
2015 ◽  
Vol 5 (76) ◽  
pp. 61759-61767 ◽  
Author(s):  
Ahmad Shaabani ◽  
Zeinab Hezarkhani ◽  
Elham Badali
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Manganese Dioxide ◽  
Aerobic Oxidation ◽  
X Ray Diffraction ◽  
Potassium Permanganate Solution ◽  
X Ray ◽  
Nano Scale ◽  
Oxidation Of Organic Compounds ◽  
Scanning Electron

A wool supported manganese dioxide nano-scale dispersion was synthesized by soaking wool in a potassium permanganate solution and characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM).

Higher Photocatalytic Activity of P-Incorporated TiO2 Nanotube Arrays

2015 ◽  
Vol 1087 ◽  
pp. 452-456
Author(s):  
Khairul Arifah Saharudin ◽  
Srimala Sreekantan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Degradation Rate ◽  
Oxygen Vacancies ◽  
Xrd Analysis ◽  
Nanotube Arrays ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

TiO2 nanotubes arrays were prepared by anodization of Ti in EG containing H3PO4 and NH4F electrolyte. The samples were characterized by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy dispersive X-ray spectroscopy (EDX) and photoluminescence spectra (PL). The as-anodized TiO2 nanotubes were annealed in inert (argon), reducing (nitrogen), or oxidizing (oxygen) atmosphere at 400 °C for 4 hr. XRD analysis revealed that the TiO2 nanotubes were anatase after annealing. In this study, the TiO2 nanotubes annealed in argon exhibited the highest degradation rate of methyl orange (MO) solution under ultraviolet irradiation among the samples. The degradation rate was approximately 98% after 5h, which may be ascribed to the large amount of oxygen vacancies and defects (phosphorus) within the Ar - TiO2 sample that simultaneously increased the degradation rate of MO.

Photocatalytic Properties of WO3 Particles with Different Grain Sizes

2016 ◽  
Vol 697 ◽  
pp. 284-287
Author(s):  
Zhen Guang Shen ◽  
Zhi Jian Peng ◽  
Jing Wen Qian ◽  
Xiu Li Fu
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Thermal Evaporation ◽  
Photocatalytic Properties ◽  
X Ray Diffraction ◽  
Thermal Evaporation Method ◽  
X Ray ◽  
Grain Sizes ◽  
Degradation Effect ◽  
Scanning Electron

WO3 particles with different grain sizes were prepared by a thermal evaporation method. The composition, morphology, and optical properties of the samples were analyzed by powder X-ray diffraction, scanning electron microscopy, and UV–vis absorption and photoluminescence spectroscopy. Their photocatalytic properties were evaluated by decomposing methylene blue in aqueous phase. It was found that the smaller the grain size of the prepared WO3 particles, the better the degradation effect on methylene blue.

scholarly journals Novel CaMoO4@GO Nanocomposite: Synthesis, Characterization, and Investigation its Photocatalytic Properties

2020 ◽  
pp. 87-95
Author(s):  
Seyed Mostafa Hosseinpour Mashkani
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Photocatalytic Properties ◽  
Energy Dispersive Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcium Molybdate ◽  
Scanning Electron

The current study aims to synthesize and characterize Calcium Molybdate-Graphene Oxide (CaMoO4@GO) nanocomposite under ultrasonic irradiation. Primarily, degradation of Methylene blue (MB) under Uv-Vis light was investigated to measure the photocatalytic properties of the as-synthesized CaMoO4@GO nanocomposite. In addition, various graphene oxide concentrations were applied to investigate its impact on the optical and photodegradation properties of calcium molybdate. X-ray diffraction (XRD), scanning electron microscopy (SEM), and spectra energy dispersive analysis of X-ray (EDS) were used to characterize CaMoO4@GO nanocomposite. DRS results demonstrated that GO influenced significantly the optical properties of CaMoO4 as much as band gap of CaMoO4@GO nanocomposite shows a redshift in comparison with pure CaMoO4. Consequently, photocatalytic results demonstrated that adding GO causes to increase photodegradation of MB form 65% (CaMoO4) to 89% (CaMoO4@GO).

scholarly journals Influence of Various Climatic Conditions on the Structural Changes of Semicrystalline PLA Spun-Bonded Mulching Nonwovens during Outdoor Composting

2019 ◽  
Author(s):  
Michał Puchalski ◽  
Piotr Siwek ◽  
Nicolay Panayotov ◽  
Małgorzata Berova ◽  
Stanisława Kowalska ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Climatic Condition ◽  
Degradation Rate ◽  
Structural Changes ◽  
Climatic Conditions ◽  
Wide Angle ◽  
Viscosity Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

This study analyzed the structural changes of semicrystalline polylactide (PLA) in the form of spun-bonded mulching nonwoven, during outdoor composting. The investigation was carried out at the microstructural, supramolecular and molecular levels using scanning electron microscopy (SEM), wide-angle X-ray diffraction (WAXD) and the viscosity method, respectively. The results showed the varying degree of influence of the climatic condition, prepared compost mixtures and time on the molecular, supramolecular and micromorphological structure of PLA spun-bonded mulching nonwoven and its degradation rate. The obtained experimental results revealed how the popular outdoor composting method, realized under two different European climatic conditions (in Poland and in Bulgary), affects the degradation of PLA nonwoven, designed for agriculture use.

scholarly journals INFLUENCE OF THE ANNEALING TEMPERATURE ON STRUCTURE PROPERTIES AND PHOTOACTIVITY OF TITANIA COATING ON PHOSPHATE SURFACE

2010 ◽  
Vol 13 (1) ◽  
pp. 10-16
Author(s):  
Linh Thi Truc Nguyen ◽  
Tri Huu Nguyen ◽  
Dzung Van Nguyen
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Methylene Blue ◽  
Room Temperature ◽  
Annealing Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Titania Coating ◽  
Scanning Electron ◽  
Structure Properties

The titania coating on phosphate surface was made by the painting method in air and at room temperature. The coatings were dried at 25°c and sintered at 15(TC, 25(FC, 350”C, 45ƠJC, 550°C for 30 minutes. X-ray diffraction, scanning electron microscopy and the cutting method (TCVN 2097-1993) were used to characterize the coatings. The results showed that the coating annealed at 350TC had the high photoactivity in the photodegradation of methylene blue.

Syntheses of Mg–Al–NO3 layered double hydroxides with high crystallinity in the presence of amines

2016 ◽  
Vol 94 (1) ◽  
pp. 66-71 ◽  
Author(s):  
Kamellia Nejati ◽  
Azam Mokhtari ◽  
Fatemeh Khodam ◽  
Zolfaghar Rezvani
Keyword(s):  
Electron Microscopy ◽  
Layered Double Hydroxides ◽  
Homogeneous Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Analysis Techniques ◽  
Structure And Morphology ◽  
Different Types ◽  
Double Hydroxides ◽  
Scanning Electron

In the present work, layered double hydroxides of Mg–Al were synthesized with nitrate interlayer anions in the presence of different types of amines such as ethylenediamine, dimethylamine, and trimethylamine, without a N2 atmosphere, from a homogeneous solution using the coprecipitation method. The concentration of the different types of amines and pH of the solution were adjusted to produce high-purity and -crystallinity samples. The structure and morphology of layered double hydroxides were characterized and investigated by powder X-ray Diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and thermogravimetric analysis techniques. The analyses showed that with increasing amine concentration, both crystallinity and purity of the samples increase at pH 10.5.

Synthesis and Activity of Ag-Doped Bi2WO6 Photocatalysts

2013 ◽  
Vol 743-744 ◽  
pp. 560-566 ◽  
Author(s):  
Ran Chen ◽  
Chao Hao Hu ◽  
Shuai Wei ◽  
Jin Hong Xia ◽  
Jian Cui ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light Irradiation ◽  
Degradation Rate ◽  
Dopant Concentration ◽  
X Ray Diffraction ◽  
X Ray ◽  
Composite Photocatalysts ◽  
Scanning Electron

Ag-doped Bi2WO6 photocatalysts were synthesized by hydrothermal method using from Bi (NO)3·5H2O, NH4VO3, and AgNO3 and further characterized by X-ray diffraction, Scanning electron microscopy, Energy dispersive X-ray detector (EDS) and UV-Vis diffusion reflectance spectra techniques. The photocatalytic activity of Ag-doped Bi2WO6 photocatalysts was evaluated by degrading RhB (10 mg/L) under visible light irradiation (λ > 420 nm). The results showed that in comparison with pure Bi2WO6 the photocatalytic activity of Ag-doped composite photocatalysts was improved significantly, and the degradation rate of RhB was increased about 26% when the Ag+ dopant concentration was 15%.

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