In situ Synthesis of p–n LaFeO3/ZnIn2S4 Heterojunctions for Enhanced Photocatalytic Activity

NANO ◽  
2019 ◽  
Vol 14 (08) ◽  
pp. 1950096 ◽  
Author(s):  
Wen Gao ◽  
Chengjia Zhang ◽  
Sainan Cui ◽  
Qian Liang ◽  
Song Xu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
In Situ Synthesis ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ft Ir ◽  
Composition Structure

In this study, LaFeO3/ZnIn2S4 composites were synthesized via in situ synthesis. The composition, structure and optical absorption properties of LaFeO3/ZnIn2S4 were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy, fluorescence spectroscopy (PL), Fourier Transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The photocatalytic activity of the LaFeO3/ZnIn2S4 photocatalyst was determined based on the degradation of methyl orange (MO). LaFeO3/ZnIn2S4 composites showed much better photocatalytic performance compared with pure LaFeO3 and ZnIn2S4. The enhanced photocatalytic performance was attributed to intimately contacted interfaces and charge transfer channels which can effectively transfer and separate the photogenerated charge carriers.

Photocatalytic Performance of BiOCl Nanosheets Composite with Graphene

2014 ◽  
Vol 496-500 ◽  
pp. 297-300 ◽  
Author(s):  
Bi Tao Liu ◽  
Liang Liang Tian ◽  
Ling Ling Peng
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Hydrothermal Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
One Step ◽  
High Migration

A series of composites of the high photoactivity of {001} facets exposed BiOCl and grapheme sheets (GS) were synthesized via a one-step hydrothermal reaction. The obtained BiOCl/GS photocatalysts were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM), Ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopy. The as-prepared BiOCl/GS photocatalyst showed enhanced photocatalytic activity for the degradation of methyl orange (MO) under UV and visible light (λ > 400 nm). The enhanced photocatalytic activity could be attributed to oxygen vacancies of the {001} facets of BiOCl/GS and the high migration efficiency of photo-induced electrons, which could suppress the charge recombination effectively.

Study on Photocatalytic Performance of F-Doped Nanometer TiO2

2011 ◽  
Vol 299-300 ◽  
pp. 171-174 ◽  
Author(s):  
Shao Feng Yan ◽  
Tong Sun
Keyword(s):  
Electron Microscopy ◽  
Rhodamine B ◽  
Diffuse Reflectance ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Synthesis Method ◽  
Order Kinetic ◽  
Transmission Electron ◽  
Ft Ir ◽  
Photocatalytic Performances

F-doped TiO2 by hydrothermal synthesis method is prepared in this paper. By basis of sunlight and porous nickels as the carriers, the samples were characterized by Transmission electron microscopy (TEM), scanning electron microscopy (SEM), infra-red (FT-IR) and diffuse reflectance spectroscopy (UV-vis). The photocatalytic performances of the samples were estimated by degrading Rhodamine B. which indicates that the reaction of photocatalytic degradation of Rhodamine B follows the zero order kinetic law. The photocatalytic performances are increased by F-doped. And F optimum doping dosage is 2.0%. After calcination at 500°C, the photocatalytic performance of the sample has not been obvious improved.

scholarly journals AgBr/(Sr0.6Bi0.305)2Bi2O7 Heterostructured Composites: Fabrication, Characterization, and Significantly Enhanced Photocatalytic Activity

Catalysts ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 394 ◽  
Author(s):  
Xinling Wang ◽  
Di Zhu ◽  
Yan Zhong ◽  
Dianhui Wang ◽  
Chaohao Hu
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Photocatalytic Performance ◽  
Diffuse Reflectance Spectroscopy ◽  
Precipitation Method ◽  
Light Illumination ◽  
X Ray ◽  
Transmission Electron ◽  
Pyrochlore Type

The pyrochlore-type (Sr0.6Bi0.305)2Bi2O7 (SBO) containing Bi3+ and Bi5+ mixed valent states was first investigated as a photocatalyst in our very recent work. To further improve the photocatalytic performance, AgBr/SBO heterostructured composites were synthesized by using a deposition-precipitation method. The characterization of phase structure, morphology, microstructure, elemental composition, and optical properties of the obtained products were performed using X-ray diffractometer (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM)TEM, X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (UV-vis DRS). The photocatalytic activity of samples was evaluated by degrading methylene blue under visible light illumination. AgBr/SBO composites possess high stability and significantly enhanced photocatalytic performance. The improvement of photocatalytic activity is due to the enhanced light absorption and the separation of photoinduced electrons and holes on the interface of AgBr/SBO heterostructured composites.

Photocatalytic Activity of Nitrogen-Doped Mesoporous Carbon Spheres Supporting Anatase TiO2 Prepared by a Simple Two-Step Solvothermal Approach

NANO ◽  
2015 ◽  
Vol 10 (05) ◽  
pp. 1550076 ◽  
Author(s):  
Tianjiao Bi ◽  
Jiafeng Wan ◽  
Shilin Yang ◽  
Xiujuan Yu ◽  
Fangwei Ma
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Mesoporous Carbon ◽  
Carbon Spheres ◽  
X Ray Diffraction ◽  
Nitrogen Doped ◽  
Transmission Electron ◽  
Ft Ir ◽  
Light Excitation ◽  
Adsorption Desorption

Nitrogen-doped mesoporous carbon spheres (NMCSs) supporting anatase TiO 2 ( NMCSs – TiO 2) were prepared by a simple two-step solvothermal approach. The characterizations for the physicochemical properties of prepared samples under different solvothermal temperatures were carried out by X-ray diffraction (XRD) analyses, scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption–desorption (Brunauer–Emmett–Teller (BET) measurements), Fourier transform infrared (FT-IR) spectroscopy, Raman scattering and UV-Vis diffuse reflectance spectra, were combined in order to determine the crystal phase and grain size, shape, degree of mesoporous carbon incorporation, and nature of the resultant oxycarbide chemical bonding on the surface and in the bulk. The high relative photocatalytic activity of NMCSs – TiO 2 nanoparticle was evaluated through a study of the decomposition of phenol under visible-light excitation.

Synthesis and Characterization of Titanium Dioxide Nanotubes for Photocatalytic Degradation of Aqueous Nitrobenzene in the Presence of Sunlight

2010 ◽  
Vol 657 ◽  
pp. 62-74 ◽  
Author(s):  
Rajesh J. Tayade ◽  
D.L. Key
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Tio2 Nanotubes ◽  
Diffuse Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
Titanium Dioxide Nanotubes ◽  
X Ray ◽  
Tio2 Anatase ◽  
Transmission Electron

TiO2 derived nanotubes were prepared by hydrothermal treatment of TiO2 (anatase) powder in 10 M NaOH aqueous solution. The crystalline structure, band gap, and morphology of the TiO2 nanotubes were determined by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), Transmission Electron microscopy (TEM) and N2 adsorption (BET) at 77 K, respectively. It was observed that the surface area of the nanotubes was increased twelve times compared with TiO2 (anatase) powder. The results demonstrated that the photocatalytic activity of TiO2 nanotubes was higher than that of TiO2 (anatase) powder. The photocatalytic activity of the nanotubes was evaluated in presence of sunlight by degradation of aqueous nitrobenzene. Complete degradation of nitrobenzene was obtained in 4 hours using TiO2 nanotubes whereas 85% degradation was observed in case of TiO2 (anatase).

scholarly journals Study of ZnO-CNT Nanocomposites in High-Pressure Conditions

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5330
Author(s):  
Laura-Madalina Cursaru ◽  
Sorina Nicoleta Valsan ◽  
Maria-Eliza Puscasu ◽  
Ioan Albert Tudor ◽  
Nicoleta Zarnescu-Ivan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron ◽  
Specific Morphology ◽  
Ft Ir ◽  
Nanocomposite Powders

Recently, carbon nanotubes (CNTs) have been used extensively to develop new materials and devices due to their specific morphology and properties. The reinforcement of different metal oxides such as zinc oxide (ZnO) with CNT develops advanced multifunctional materials with improved properties. Our aim is to obtain ZnO-CNT nanocomposites by in situ hydrothermal method in high-pressure conditions. Various compositions were tested. The structure and morphology of ZnO-CNT nanocomposites were analyzed by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry—thermogravimetry (DSC-TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and transmission electron microscopy (TEM). These analyses showed the formation of complex ZnO-CNT structures. FT-IR spectra suggest possible interactions between CNT and ZnO. DSC-TG analysis also reveals the formation of some physical bonds between ZnO and CNT, through the appearance of endothermic peaks which could be assigned to the decomposition of functional groups of the CNT chain and breaking of the ZnO-CNT bonds. XRD characterization demonstrated the existence of ZnO nanocrystallites with size around 60 nm. The best ZnO:CNT composition was further selected for preliminary investigations of the potential of these nanocomposite powders to be processed as pastes for extrusion-based 3D printing.

scholarly journals A Facile Synthesis of Graphene-WO3Nanowire Clusters with High Photocatalytic Activity for O2Evolution

2014 ◽  
Vol 2014 ◽  
pp. 1-6
Author(s):  
M.-J. Zhou ◽  
N. Zhang ◽  
Z. H. Hou
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
High Photocatalytic Activity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Charge Transfer Rate ◽  
Ft Ir

In the present work, graphene-WO3nanowire clusters were synthesizedviaa facile hydrothermal method. The obtained graphene-WO3nanowire clusters were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy (DRS) techniques. The photocatalytic oxygen (O2) evolution properties of the as-synthesized samples were investigated by measuring the amount of evolved O2from water splitting. The graphene-WO3nanowire clusters exhibited enhanced performance compared to pure WO3nanowire clusters for O2evolution. The amount of evolved O2from water splitting after 8 h for the graphene-WO3nanowire clusters isca.0.345 mmol/L, which is more than 1.9 times as much as that of the pure WO3nanowire clusters (ca.0.175 mmol/L). The high photocatalytic activity of the graphene-WO3nanowire clusters was attributed to a high charge transfer rate in the presence of graphene.

Effect of Zinc Ion on the Electrochemical and Thermal Performance of Polyaniline/Activated Carbon Composites Prepared by In Situ Emulsion Polymerization

2013 ◽  
Vol 721 ◽  
pp. 8-11
Author(s):  
Chen Li ◽  
Yan Hong Tian ◽  
Xue Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Activated Carbon ◽  
Emulsion Polymerization ◽  
Xrd Analysis ◽  
Zinc Ion ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ft Ir ◽  
Fourier Transform Ir

Using dodecyl benzenesulfonic acid (DBSA) as surfactant, composites of polyaniline (PANI)/activated carbon (AC) with core-shell structures were prepared by in situ emulsion polymerization in the presence of different concentrations of zinc ion. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) analysis and Fourier-transform IR (FT-IR) spectroscopy were used to analyze morphologies and structures of the composites. Thermal stability of the composites was investigated by thermogravimetric analysis (TGA).The electrochemical properties of PANI/AC composites were studied by galvanostatic charge/discharge tests. The composites exhibited different electrochemical and thermal behavior, which was found to be a function of the concentration of zinc ion.

scholarly journals One-Step Synthesis of MoS2/TiSi2 via an In Situ Photo-Assisted Reduction Method for Enhanced Photocatalytic H2 Evolution under Simulated Sunlight Illumination

Catalysts ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 299 ◽  
Author(s):  
Chunyong Zhang ◽  
Aijuan Liu ◽  
Kezhen Li ◽  
Yukou Du ◽  
Ping Yang
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Response Spectrum ◽  
Morphological Properties ◽  
X Ray Diffraction ◽  
Complex Catalyst ◽  
Transmission Electron ◽  
One Step

A new MoS2/TiSi2 complex catalyst was designed and synthesized by a simple one-step in situ photo-assisted reduction procedure. The structural and morphological properties of the composites were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and ultraviolet-visible diffused reflectance spectroscopy (UV-vis DRS), which proved the formation of MoS2/TiSi2. MoS2/TiSi2 with optimized composition showed obviously enhanced photocatalytic activity and superior durability for water reduction to produce H2. The H2 generation rate over the MoS2/TiSi2 photocatalyst containing 3 wt % MoS2 reached 214.1 μmol·h−1·g−1 under visible light irradiation, which was ca. 5.6 times that of the pristine TiSi2. The improved photocatalytic activity of MoS2/TiSi2 could be related to the broad response spectrum, large visible light absorption, and synergies among MoS2 and TiSi2 that enhance photoexcited charge transfer and separation.

scholarly journals Synthesis, Characterization, and Catalytic Properties of Magnetic Fe3O4@FU: A Heterogeneous Nanostructured Mesoporous Bio-Based Catalyst for the Synthesis of Imidazole Derivatives

2020 ◽  
Vol 8 ◽  
Author(s):  
Maryam Banazadeh ◽  
Sara Amirnejat ◽  
Shahrzad Javanshir
Keyword(s):  
Electron Microscopy ◽  
Reaction Times ◽  
Sulfated Polysaccharide ◽  
X Ray Diffraction ◽  
Adsorption Method ◽  
Environmental Friendliness ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir

In this protocol, Fucoidan (FU), a fucose-rich sulfated polysaccharide extracted from brown algae Fucus vesiculosus was used for in situ preparation of magnetic Fe3O4@FU. Nanoco magnetic properties of Fe3O4@FU were investigated by energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) adsorption method, and vibrating sample magnetometer (VSM). The catalytic activity of Fe3O4@FU was employed for the synthesis of tri- and tetra-substituted imidazoles through three- and four-component reactions respectively, between benzyl, aldehydes, NH4OAc and benzyl, aldehydes, NH4OAc, and amine under reflux in ethanol. It is worth nothing that excellent yields, short reaction times, chromatography-free purification, and environmental friendliness are highlighted features of this protocol.

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