Catalytic Ozonation of Humic Acids with La-Mn/γ-Al2O3 Complexation Catalysts

2012 ◽  
Vol 518-523 ◽  
pp. 691-695
Author(s):  
Yan Li ◽  
Yong Liu ◽  
Shi Lin Zhao ◽  
Peng Juan Yuan ◽  
Lin Li
Keyword(s):  
Room Temperature ◽  
Joint Effect ◽  
Catalytic Ozonation ◽  
Uv Absorbance ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Simulated Wastewater ◽  
Xrd Patterns ◽  
Scanning Electron

This study was conducted to investigate the effect of a catalytic ozonation system for the treatment of humic acid(HA) as simulated wastewater by use of the rare earth and transition metal complexing γ-Al2O3catalysts(RTCC) in aqueous solution at room temperature. In the reaction, HA was removed by the joint effect of ozonation and catalytic oxidation. Experimental results showed that the optimum technological conditions were calcination at 723 K, pH of 11 and 1:1 ratio (La (NO3)3/ Mn (NO3)2) for the preparation of RTCC. The ozonation with RTCC induced a significant degradation efficiency of HA in UV absorbance, as compared to ozone alone was 21.11% higher after 30 minutes reaction. The RTCC samples were measured by X-ray diffraction (XRD) patterns and scanning electron microscope (SEM) images.

scholarly journals Investigation of Ferrimagnetic Sr-hexaferrite Nanocrystals for Clinical Hyperthermia

2021 ◽  
pp. X
Author(s):  
Burcu ERTUĞ
Keyword(s):  
Crystallite Size ◽  
Room Temperature ◽  
Vibrating Sample Magnetometry ◽  
Sem Images ◽  
Ceramic Method ◽  
X Ray ◽  
The Mean ◽  
Xrd Patterns ◽  
Potential Use ◽  
Scanning Electron

Sr-hexaferrite samples were produced via the conventional ceramic method. X-ray diffractometry (XRD) patterns confirmed the single nanocrystal phase as Sr-hexaferrite where any pattern peaks of unreacted Fe2O3 phase were  not detected. The mean crystallite size values were determined to be 44.12±3.4nm and 41.2±3.2nm for SHF-O1 and SHF-O2, respectively. The chemical bonding peaks of our sample indicated that the structure of Sr-hexaferrite formation was confirmed by FTIR spectra result. Scanning electron microscopy (SEM) images indicated clearly observed porosity regions with relative densities as high as 94% and 87% for SHF-O1 and SHF-O2 samples.The vibrating sample magnetometry (VSM) of each sample at 2K and under a magnetic field of 10 kOe yielded saturation magnetizations, Ms of 93.5 and 94.1 emu/g; remanence values, Mr of 76.4 and  67.8 emu/g for SHF-O1 and SHF-O2, respectively. The magnetization loops of both samples indicated a soft ferrimagnetic behaviour in which the saturation magnetizations were higher than those measured  at room temperature in the previous studies. The coercivities, Hc were measured to be 150Oe for both samples. The squareness values, SQR (Mr/Ms) were measured to be high, approximately 0.82 and 0.72 for SHF-O1 and SHF-O2, respectively. Depending on the adequate values of magnetization and coercivity along with small mean crystallite size and low porosity values of the obtained Sr-hexaferrite samples, we estimate that these samples are likely to be evaluated further for the potential use as thermoseeds in the field of clinical hyperthermia.

Electrodeposited Ni-Co Films from Electrolytes with Different Co Contents

2021 ◽  
Vol 406 ◽  
pp. 219-228
Author(s):  
Ouahiba Herzallah ◽  
Hachemi Ben Temam ◽  
Asma Ababsa ◽  
Abderrahmane Gana
Keyword(s):  
Content Increase ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Hcp Structure ◽  
Xrd Patterns ◽  
Steel Substrates ◽  
Co Alloys ◽  
Scanning Electron

Ni–Co alloy coatings were electrodeposited at various cobalt amounts on pretreated steel substrates. The co-deposition phenomenon of Ni-Co alloys was described as anomalous behaviour. Different techniques including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), X-ray diffraction (XRD) and potentiodynamic polarization were used to characterize the alloy coatings. EDX results showed that the Co content increase with the enhancing of Co amount. SEM images have shown that the increase of Co amount leads grain developing from large grain to branched grain form and that goes through spherical and pyramidal, this implies that the grain size of these alloy coatings is greatly affected by Co amount in the electrolyte baths. XRD patterns revealed that the phase structure of Ni–Co coatings is dramatically changed from fcc into hcp structure with the increase of Co amount. The electrochemical properties of Ni-Co alloy coatings evaluated in 3.5% NaCl solution reveal that Ni–34.32 wt.% Co alloy exhibits better corrosion resistance compared to pure Ni and other Ni–Co alloy coatings.

Alcohol Sensing Properties of SnO2/CNT Nanocomposites Synthesized by Microwave-Assisted Process

2016 ◽  
Vol 675-676 ◽  
pp. 85-88
Author(s):  
Nalita Sawangjit ◽  
Wicharn Techitdheera ◽  
Wisanu Pecharapa
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Structural Morphology ◽  
X Ray ◽  
Multi Wall Carbon Nanotubes ◽  
Microwave Assisted ◽  
Sensing Sensitivity ◽  
Scanning Electron

SnO2/CNT nanocomposites were synthesized via microwave-assisted process using SnCl4·5H2O as a starting precursor and UV-treated multi-wall carbon nanotubes (MWCNTs) as scaffolds. The concentration of SnCl4 was varied in the range of 0.01-0.05 M. Effect of precursor concentration on their physical properties and micro structural morphology were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). XRD results indicate that the as-synthesized composites are the mixture of two separated phases including SnO2 and MWCNT. SEM images indicate that the surfaces of MWCNT are thoroughly covered with SnO2 nanoparticles. Comparative gas sensing result reveals that the prepared hybrid SnO2/MWCNT composites exhibit much higher sensing sensitivity and recovery property in detecting alcohol gas at room temperature than the bare SnO2.

Effect of La2O3 on the Microstructure and Electrical Properties of 0.82Bi0.5Na0.5TiO3-0.18Bi0.5K0.5TiO3 Ceramics

2011 ◽  
Vol 284-286 ◽  
pp. 1408-1411
Author(s):  
Yan Li ◽  
Yan Jie Zhang ◽  
Rui Qing Chu ◽  
Zhi Jun Xu ◽  
Qian Chen ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Coupling Factor ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Pure Perovskite Structure ◽  
X Ray ◽  
Xrd Patterns ◽  
Dielectric And Piezoelectric Properties

La2O3-doped lead-free 0.82Bi0.5Na0.5TiO3-0.18Bi0.5K0.5TiO3(abbreviated to 0.82BNT-0.18BKT) piezoelectric ceramics were synthesized by the conventional mixed-oxide method, and the effect of La2O3addition on the dielectric and piezoelectric properties was investigated. X-ray diffraction (XRD) patterns show that La2O3diffuses into the lattice of the 0.82BNT-0.18BKT ceramics to form a solid solution with a pure perovskite structure. SEM images indicate that the grain size of the 0.82BNT-0.18BKT ceramics increased with the addition of La2O3doping. The electrical properties of 0.82BNT-0.18BKT ceramics have been greatly improved by certain amount of La2O3substitutions. At room temperature, the 0.82BNT-0.18BKT ceramics doped with 0.25 wt. % La2O3exhibited the optimum properties with high piezoelectric constant (d33= 142 pC/N) and high planar coupling factor (kp= 0.23).

Synthesis and Characterization of Flower-Sphere MoS2

2011 ◽  
Vol 695 ◽  
pp. 429-432 ◽  
Author(s):  
Jun Zhou ◽  
Xin Zhe Lan ◽  
Ping Ren ◽  
Qiu Li Zhang ◽  
Yong Hui Song ◽  
...  
Keyword(s):  
Particle Size ◽  
Hydrothermal Systems ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Xrd Patterns ◽  
Scanning Electron

The flower-sphere molybdenum disulfide has been synthesized by reaction of Na2MoO4 and CS(NH2)2 with NH2OH·HCl or H2C2O4 as reductant. The microstructure and chemical composition of the product were characterized by means of X-ray diffraction and scanning electron microscope. XRD patterns showed that the molar ratio of Mo to S had a great effect on the purity of the product. When the molar ratio of Mo to S was 1:5, the product was nearly pure MoS2. SEM images showed that the particle size increased as the molar ratio of Mo to S reduced. The MoS2 microspheres had rough surfaces and were constructed with sheet-like structures in the two systems. But the product from the system of NH2OH·HCl as reductant has the bigger particle size, clearer petal-sheets, coarser surface and weaker agglomeration than that from the system H2C2O4 as reductant. The possible chemical reactions in hydrothermal systems were preliminarily discussed.

Investigation of Nanostructures Materials from Rice Husk Ash by Thermal Process

2013 ◽  
Vol 717 ◽  
pp. 58-61
Author(s):  
Khanidtha Jantasom ◽  
Potjanee Somrud ◽  
Suttinart Noothongkeaw ◽  
Ki Seok An ◽  
Udom Tipparach ◽  
...  
Keyword(s):  
Rice Husk ◽  
Thermal Process ◽  
Rice Husk Ash ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Stereo Microscope ◽  
Xrd Patterns ◽  
Source Materials ◽  
Scanning Electron

Nanostructures materials were prepared from rice husk ash by carbon charcoal assisted. The rice husk ash mixed with coconut shell charcoal and Cu-Sn powder as the source materials. The mixtures materials were heated at 1100 °C under atmosphere of nitrogen with flow rate of 1 L/min. After the temperature was cool down, the prepared products were characterized by the stereo microscope, scanning electron microscope (SEM) and X-ray diffraction (XRD). The SEM images showed nanostructures materials such as nanoparticles, nanorods and nanowires. The XRD patterns indentified that the consisted of nanostructures materials were SiO2-CuO phase.

Hydrothermal synthesis of momordica-like CuO nanostructures using egg white and their characterisation

2012 ◽  
Vol 66 (4) ◽  
Author(s):  
Yun-Ling Zou ◽  
Yan Li ◽  
Jian-Gang Li ◽  
Wan-Jie Xie
Keyword(s):  
Electron Microscopy ◽  
Egg White ◽  
Monoclinic Structure ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Egg White Protein ◽  
Xrd Patterns ◽  
Cuo Nanorods ◽  
Scanning Electron

AbstractIn this paper, we report on the preparation of momordica-like CuO nanostructures by the hydrothermal method using freshly extracted egg white protein (ovalbumin) in an aqueous medium. These momordica-like CuO nanostructures were characterised by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM). XRD patterns showed that these nanostructures had a polycrystalline nature with a monoclinic structure. FE-SEM images indicated that the momordica-like CuO nanostructures obtained at 180°C for 15 h were composed of CuO nanorods with a length of less than 100 nm and a width ranging from 30 nm to 50 nm. Finally, a possible growth mechanism for the momordica-like CuO nanostructures is proposed and discussed.

ROOM TEMPERATURE PHOTOLUMINESCENCE OF POLYCRYSTALLINE SIC PREPARED FROM CARBON-SATURATED SI MELT

2002 ◽  
Vol 16 (06n07) ◽  
pp. 1047-1051
Author(s):  
JIANPING MA ◽  
ZHIMING CHEN ◽  
GANG LU ◽  
MINGBIN YU ◽  
LIANMAO HANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Composition And Structure ◽  
Light Excitation ◽  
Scanning Electron

Intense photoluminescence (PL) has been observed at room temperature from the polycrystalline SiC samples prepared from carbon-saturated Si melt at a temperature ranging from 1500 to 1650°C. Composition and structure of the samples have been confirmed by means of X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. PL measurements with 325 nm UV light excitation revealed that the room temperature PL spectrum of the samples consists of 3 luminescent bands, the peak energies of which are 2.38 eV, 2.77 eV and 3.06 eV, respectively. The 2.38 eV band is much stronger than the others. It is suggested that some extrinsic PL mechanisms associated with defect or interface states would be responsible to the intensive PL observed at room temperature.

STRUCTURE AND MAGNETIC PROPERTIES OF MECHANICAL ALLOYED Mn-15at.%Al

2013 ◽  
Vol 12 (01) ◽  
pp. 1350006
Author(s):  
AHMED E. HANNORA ◽  
FARIED F. HANNA ◽  
LOTFY K. MAREI
Keyword(s):  
Thermal Analysis ◽  
Room Temperature ◽  
Average Crystallite Size ◽  
Al Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Milled Sample ◽  
Powder Samples ◽  
Xrd Patterns ◽  
Method Analysis

Mechanical alloying (MA) method has been used to produce nanocrystallite Mn -15at.% Al alloy. X-ray diffraction (XRD) patterns for the as-milled elemental α- Mn and aluminum powder samples show a mixture of α + β- MnAl phases after 20 h of milling and changes to a dominant β- MnAl phase structure after 50 h. An average crystallite size of 40 nm was determined from Hall–Williamson method analysis after 5 h of milling. Moreover, the thermal analysis results using differential thermal analysis (DTA), suggested a possible phase transformation after 20 h of milling. Isothermal treatments are carried in the temperature range of 450°C to 1000°C. Room-temperature vibrating sample magnetometer (VSM) measurements of the hysteretic response revealed that the saturation magnetization Bs and coercivity Hc for 10 h ball milled sample are ~ 2.1 emu/g and ~ 92 Oe, respectively.

Influence of Silicon Nitride on Properties of Corundum Based Castable

2013 ◽  
Vol 634-638 ◽  
pp. 2358-2361
Author(s):  
Jun Cong Wei ◽  
Li Rong Yang
Keyword(s):  
Electron Microscopy ◽  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
Cold Strength ◽  
X Ray ◽  
Refractory Castables ◽  
Shock Resistance ◽  
Scanning Electron

The effects of Si3N4 addition on the room temperature physical properties and thermal shock resistance properties of corundum based refractory castables were investigated using brown corundum, white corundum and alumina micropowder as the starting materials and pure calcium aluminate as a binder. The phase composition, microstructure, mechanical properties of corundum based castables were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that as the increase in Si3N4 addition, the bulk density decreased and apparent porosity increased, the cold strength deduced. However, the residual strength rate increased. That is, the thermal shock resistance was improved. This is because even though the introduction of Si3N4 inhibited the sintering of material and deduced the compactness, microcracks were produced in the materials due to a difference in thermal expansion coefficient. So the thermal shock resistance of corundum based castable was improved.

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