Synthesis of HTCMgFe for the degradation of indigo carmine through heterogeneous photo-Fenton treatment

MRS Advances ◽  
2020 ◽  
Vol 5 (62) ◽  
pp. 3273-3282
Author(s):  
I. Cosme-Torres ◽  
M.G. Macedo-Miranda ◽  
S.M. Martinez-Gallegos ◽  
J.C. González-Juárez ◽  
G. Roa-Morales ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Treatment Time ◽  
Uv Light ◽  
Indigo Carmine ◽  
Oh Radicals ◽  
Absorption Bands ◽  
Chromophore Group ◽  
X Ray ◽  
Catalytic Sites ◽  
Scanning Electron

AbstractThe heterogeneous catalyst HTCMgFe was used in the degradation of the IC, through the heterogeneous photo-fenton treatment, this material in combination with H2O2 and UV light degraded the dye in 30 min at pH 3. As the amount of HTCMgFe increases the degradation it was accelerated because there are more active catalytic sites of Fe2+ on the surface of the material, which generates a greater amount of •OH radicals. The HTCMgFe was characterized by infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray energy dispersive elemental analysis (EDS). The UV-vis spectrum shows that the absorption bands belonging to the chromophore group of the IC disappear as the treatment time passes, indicating the degradation of the dye.

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.

Recovery of silver metal from low concentrated wastewater by photocatalysis

2015 ◽  
Vol 29 (10n11) ◽  
pp. 1540028 ◽  
Author(s):  
Mali Ding ◽  
Jie Han ◽  
Wei Qiu ◽  
Weijun Zhang ◽  
Wei Gao
Keyword(s):  
Electron Microscopy ◽  
Uv Light ◽  
Superior Performance ◽  
Catalyst Loading ◽  
X Ray ◽  
Zno Nanopowder ◽  
Removal Efficiencies ◽  
Concentrated Solution ◽  
Silver Metal ◽  
Scanning Electron

This work studies the photocatalytic activity of zinc oxide ( ZnO ) nanopowder to recover silver ( Ag ) metal from low Ag + concentrated solution under artificial ultraviolet (UV) light. Benchmark titanium dioxide (P25 TiO 2) was used for comparison purpose. Experimental results indicated that ZnO exhibited superior performance for Ag recovery compared to TiO 2. Under optimal catalyst loading, the achieved Ag removal efficiencies were 100% and 99.94% at 0.2 g/L ZnO (1 h) and 2 g/L TiO 2 (2 h), respectively. An induction period at low concentration of TiO 2 (0.1 g/L) was observed and a mechanism was proposed. The photodissolution of ZnO was assessed and proved to be negligible. Recovered pure Ag metal was characterized by X-ray diffractometry (XRD) and scanning electron microscopy (SEM), showing a promising effective Ag recovery technology using ZnO photocatalyst.

scholarly journals Differential surface characterizations of cotton fibers coated with TiO2 and ZnO nanoparticles for nano-based analysis of fabrics

2021 ◽  
Vol 16 ◽  
pp. 155892502110438
Author(s):  
Parshuram Singh ◽  
Sapna Balayan ◽  
Rajendra Kumar Sarin ◽  
Utkarsh Jain
Keyword(s):  
Electron Microscopy ◽  
Uv Light ◽  
Natural Fibers ◽  
Vital Role ◽  
Cotton Fibers ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Uv Visible ◽  
Unit Component ◽  
Scanning Electron

Fibers are the unit component for product development. They can be divided into two types: synthetic and natural fibers. Recently, emerging nanotechnology has played a vital role in advancing next-generation fabrics. The nanomaterials provide several unique properties such as higher conductivity, self-cleaning, water-resistant, and others. Owing to their advanced properties, the fabrics are being developed by coating and integrating with nanomaterials. Therefore, in the presented work two cotton samples were modified with titanium dioxide (TiO2) and zinc oxide (ZnO). These samples were further examined under various techniques including scanning electron microscopy (SEM), UV-visible spectroscopy, X-ray fluorescence (XRF), and Fourier-transform infrared spectroscopy (FTIR). Furthermore, these samples were evaluated at varying wavelengths with UV light and the obtained results demonstrated that the nano-coated fiber samples can be differentiated at 365 nm.

Platinum Reduction Study on Pt/C Electro-catalysts for PEMFC

2013 ◽  
Vol 16 (3) ◽  
pp. 141-145
Author(s):  
M.L. Hernandez-Pichardo ◽  
R. Gonzalez-Huerta ◽  
P. del Angel ◽  
E. Palacios-Gonzalez ◽  
M. Tufiño-Velazquez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Uv Light ◽  
Reducing Agents ◽  
Impregnation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
Platinum Species ◽  
Scanning Electron

Platinum reduction on Pt/C catalysts was studied on samples prepared by the impregnation method using different Pt precursors and reducing agents such as ethanol, sodium borohydride and ethanol-UV light (photo-assisted reduction), in order to compare the efficiency of the different reducing agents. The influence of the reduction level of the platinum species on the electrochemical behavior of these catalysts has been determined. The catalysts were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and linear and cyclic voltammetry. The results show that the reduction level depends mainly on the platinum precursor. Moreover, it was found that the higher electrochemical activity was found using catalysts reduced with ethanol, whereas by using NaBH4 as the reducing agent, the total reduction of the platinum precursor is very difficult in same synthesis conditions. The analysis of the XPS results shows that samples reduced with ethanol presented the lower PtOx/Pt reduction ratio.

Effect of heat treatment time and temperature on the properties of YBa2Cu3O7−x

1989 ◽  
Vol 4 (5) ◽  
pp. 1093-1098 ◽  
Author(s):  
Ira Bloom ◽  
B. S. Tani ◽  
M. C. Hash ◽  
Donglu Shi ◽  
M. A. Patel ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Electrical Properties ◽  
Treatment Time ◽  
The Other ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Rich Material ◽  
Scanning Electron

Two YBa2Cu3O7−x powders were investigated: one was nearly stoichiometric, and the other, CuO-rich. After being sintered at 950 °C, samples from both powders were heat-treated in oxygen at 845, 860, and 910 °C for up to 10 days. The samples were characterized by differential thermal analysis, x-ray diffraction, optical and scanning electron microscopy, iodometric titrations, and measurement of their superconducting properties (electrical resistivity, critical temperature, and critical current density). The electrical properties of the nearly stoichiometric material improved with time at all temperatures. On the other hand, the electrical properties of the CuO-rich material deteriorated with temperature, possibly owing to problems associated with grain growth at 910 °C.

The Facile Hydrothermal Preparation of WO3 and its Photocatalytic Performance under Visible-Light Irradiation

2014 ◽  
Vol 936 ◽  
pp. 347-351 ◽  
Author(s):  
Fen Fen Li ◽  
Hong Tao Gao ◽  
Guang Jun Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Hydrothermal Process ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Hydrothermal Preparation ◽  
X Ray ◽  
Scanning Electron

The orthorhombic WO3 nanoplates were fabricated via a hydrothermal process, using HBF4 as the acid source. They were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-vis diffused reflectance spectroscopy (UV-Vis DRS), respectively. The WO3 nanoplates exhibited nice UV-light driven photocatalytic performance in the degradation of Rhodamine B (RhB).

Analysis of the Hydroxyapatite Incorporate MTA Dental Application

2012 ◽  
Vol 727-728 ◽  
pp. 1381-1386 ◽  
Author(s):  
Criseuda Maria Benício Barros ◽  
Sara Verusca de Oliveira ◽  
Janaina Benício Marques ◽  
Kaline Melo de Souto Viana ◽  
Ana Cristina Figueiredo de Melo Costa
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Mineral Trioxide Aggregate ◽  
X Ray Diffraction ◽  
Absorption Bands ◽  
Radiographic Appearance ◽  
X Ray ◽  
Structure Morphology ◽  
Dental Application ◽  
Scanning Electron

This research was incorporated the hydroxyapatite in a mineral trioxide aggregate sealer, with the aim of studying this influence in the structure, morphology and radiopacity of the cement to obtain osteoconductive material. The samples were characterized by X ray diffraction (XRD), spectrometry fluorescence X ray (EDX), spectroscopy transform infrared Fourier (FTIR), scanning electron microscopy (SEM) and radiographic appearance. Through the results obtained by XRD for the new sealer observed the formation of phases HAp and MTA evidenced by the presence of phases: CaO, SiO2and Bi2O verified also by EDX. Through FTIR was observed the presence of absorption bands related to links Ca-O, Si-O and Bi-O present in MTA and P-O present in HAp. The morphology visualized by SEM consists of irregular agglomerates with the formation of pre-sintered particles. The sample MTA/HAp3% presented radiopacity viable for their application as endodontic cement.

Synthesis and Photocatalytic Performance of Pd/FeVO4 Composite Photocatalysts

2012 ◽  
Vol 433-440 ◽  
pp. 367-371
Author(s):  
Min Wang ◽  
Qiong Liu
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Oxidation ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Composite Photocatalysts ◽  
Effect Of Pd ◽  
Scanning Electron

Pd/FeVO4composite photocatalysts were synthesized by the impregnation method.The as-prepared samples were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM).And the obtained samples were characterized by XRD, SEM and BET. The effect of Pd-loaded contents on their photocatalytic activity was studied by photocatalytic oxidation of methyl orange under 20 W UV light irradiation. The mechanism was also analysised. The results show that PdO can remarkably affect the photocatalytic activity.The photocatalyty activity of Pd-loaded FeVO4was significantly enhanced and the decolorization rate of MO can be increased 27% more than that of pure FeVO4sample when loading content is 3.5wt %.

scholarly journals Synthesis of polyaniline nanotubes through UV light catalytic method

2015 ◽  
Vol 33 (1) ◽  
pp. 193-197
Author(s):  
Sun Chuanyu ◽  
Wang Yu
Keyword(s):  
Electron Microscopy ◽  
Uv Light ◽  
Copper Nitrate ◽  
Internal Diameter ◽  
External Diameter ◽  
Catalytic Method ◽  
X Ray ◽  
Transmission Electron ◽  
Polyaniline Nanotubes ◽  
Scanning Electron

AbstractIn this study, nitrocellulose (NC) fiber blanket prepared by electrostatic spinning method has been used as a template, and copper nitrate (Cu(NO3)2) as an oxidant to synthesise polyaniline nanotubes doped with heteropolyacid (H4SiW12O40, SiW12) using UV light catalytic method. Infrared spectroscopy (IR), X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) technologies were applied to characterize the prepared samples of polyaniline nanotubes. The results show that the external diameter of the tube is about 200 nm, and the internal diameter about 170 nm. We also give a reasonable speculation and explanation about the formation mechanism of the nanotubes.

scholarly journals Ultrasonic-Assisted Synthesis, Characterization, and Optical Properties of Sb Doped ZnO and Their Photocatalytic Activities

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Anukorn Phuruangrat ◽  
Waipawan Kongpet ◽  
Oranuch Yayapao ◽  
Budsabong Kuntalue ◽  
Somchai Thongtem ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Blue Shift ◽  
Zno Nanostructures ◽  
Absorption Bands ◽  
X Ray ◽  
Transmission Electron ◽  
Ultrasonic Assisted ◽  
Doped Zno

Sb doped ZnO nanostructures were synthesized by an ultrasonic-assisted method. Effect of Sb dopant on the structure, morphology, and composition of as-synthesized Sb doped ZnO nanostructures was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) spectroscopy, and transmission electron microscopy (TEM). All samples were identified to wurtzite hexagonal ZnO structure. UV-visible spectra of the as-synthesized 3% Sb doped ZnO sample exhibit broad absorption bands at around 343 nm which is blue shift of 373 nm of pure ZnO. The photocatalytic activity was tested by decolorization of methylene blue (MB) solution under UV light. After 300 min irradiation, the degradation efficiencies were 56, 90, and 95% for ZnO, 1% Sb doped ZnO, and 3% Sb doped ZnO, respectively. The 3% Sb doped ZnO shows the highest photocatalytic activity than any other samples.

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