The Structure Feature of Novel Cu2O/e-HTi2NbO7 Nanocomposite and Their Enhanced Photocatalytic Activity

NANO ◽  
2017 ◽  
Vol 12 (08) ◽  
pp. 1750100 ◽  
Author(s):  
Jie Li ◽  
Lei Xu ◽  
Jie He ◽  
Pan Zhou ◽  
Lifang Hu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Oxidation ◽  
Laser Raman Spectroscopy ◽  
The Novel ◽  
Diffuse Reflection Spectroscopy ◽  
X Ray Diffraction ◽  
Laser Raman ◽  
Transmission Electron ◽  
Light Region ◽  
Adsorption Desorption

The novel Cu2O/[Formula: see text]-HTi2NbO7 heterojunction nanocomposite was assembled through a facile exfoliation-restacking route. The as-prepared nanocomposite and its precursors, Cu2O and [Formula: see text]-HTi2NbO7, were characterized by means of X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), N2 adsorption–desorption measurements, laser Raman spectroscopy (LRS) and UV–Vis diffuse reflection spectroscopy (UV–Vis DRS). The photocatalytic performance was evaluated by photocatalytic oxidation of ethyl mercaptan (EM) and photocatalytic degradation of methylene blue (MB) dyes under sunlight irradiation. The results showed that Cu2O nanoparticles were successfully distributed on the surface of [Formula: see text]-HTi2NbO7 nanosheets, and the intensity of spectral absorption of the as-prepared nanocomposite in the visible-light region was significantly enhanced. The as-prepared nanocomposite displayed the enhanced photocatalytic activity than the Cu2O nanoparticles and HTi2NbO7 nanosheets due to the formation of a heterojunction structure between Cu2O nanoparticles and HTi2NbO7 nanosheet and a possible photocatalytic mechanism was suggested.

scholarly journals Enhanced Photocatalytic Activity by Cu2O Nanoparticles Integrated H2Ti3O7 Nanotubes for Removal of Mercaptan

NANO ◽  
2017 ◽  
Vol 12 (06) ◽  
pp. 1750075 ◽  
Author(s):  
Chunli Guo ◽  
Lei Xu ◽  
Jie He ◽  
Lifang Hu ◽  
Bin Wang ◽  
...  
Keyword(s):  
Spectral Response ◽  
Laser Raman Spectroscopy ◽  
Diffuse Reflection Spectroscopy ◽  
X Ray Diffraction ◽  
Sunlight Irradiation ◽  
Laser Raman ◽  
Transmission Electron ◽  
Light Region ◽  
Cu2o Nanoparticles ◽  
Adsorption Desorption

The Cu2O@H2Ti3O7 nanocomposite was prepared through a facile hydrothermal method. The as-prepared samples were investigated by powder X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), laser Raman spectroscopy (LRS), N2 adsorption-desorption measurements and UV-Vis diffuse reflection spectroscopy (UV-Vis–DRS). The photocatalytic performance of the as-prepared Cu2O@H2Ti3O7 nanocomposite is evaluated by the oxidation of ethyl mercaptan (EM) under sunlight irradiation. The results indicate that the Cu2O nanoparticles are integrated uniformly on H2Ti3O7 nanotubes, and the absorption edge of the nanocomposite has obviously shifted to visible light region compared to H2Ti3O7 nanotubes. There is an obvious synergistic effect existing between the dispersed Cu2O nanoparticles and H2Ti3O7 nanotubes, and the Cu2O@H2Ti3O7 composite shows stronger visible spectral response and wider absorbance. Then, an enchanced photodegradation activity is obtained for the removal of EM under sunlight irradiation compared to its precursors.

Synthesis of CeO2/e-HTiNbO5 Nanocomposite and Its Application for Photocatalytic Oxidation Desulfurization

NANO ◽  
2016 ◽  
Vol 11 (02) ◽  
pp. 1650018 ◽  
Author(s):  
Yuanjiao Zhang ◽  
Ningning Wang ◽  
Jie He ◽  
Liangguo Da ◽  
Zhong Li
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Oxidation ◽  
Diffuse Reflectance Spectroscopy ◽  
Proton Exchange ◽  
Light Irradiation ◽  
Laser Raman Spectroscopy ◽  
Natural Light ◽  
X Ray Diffraction ◽  
Laser Raman ◽  
Transmission Electron

Nanoscaled CeO2/e-HTiNbO5 composite was assembled by a facile process using colloidal TiNbO[Formula: see text] (e-HTiNbO5) nanosheet and CeO2 colloid as precursors at room temperature. The nanosheet e-HTiNbO5 was obtained through proton-exchange and exfoliation process from its parent KTiNbO5. The microstructures and properties of the as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Laser Raman spectroscopy (LRS), and UV-vis diffuse reflectance spectroscopy (UV-vis DRS), etc. The photocatalytic activity of the obtained nanocomposite is evaluated by the adsorption and photocatalytic oxidation of ethyl mercaptan (EM) under natural light irradiation. The results show that CeO2 nanoparticles are dispersed uniformly on the surface of e-HTiNbO5 and the layered structure of e-HTiNbO5 nanosheet maintains integrity. The interaction between dispersed CeO2 particles and e-HTiNbO5 results in lower bandgap compared to its precursors, and the photocatalytic activity of CeO2/e-HTiNbO5 are enhanced under natural light irradiation.

PEG-Assisted Hydrothermal Synthesis and Photocatalytic Activity of Bi2Fe4O9 Crystallites

2011 ◽  
Vol 1292 ◽  
Author(s):  
Dengrong Cai ◽  
Jianmin Li ◽  
Shundong Bu ◽  
Shengwen Yu ◽  
Dengren Jin ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance Spectrum ◽  
X Ray Diffraction ◽  
Hydrothermal Route ◽  
Peg 400 ◽  
Transmission Electron ◽  
Light Region ◽  
Facile Hydrothermal Route ◽  
Degradation Ratio

ABSTRACTA facile hydrothermal route assisted by polyethylene glycol (PEG) 400 was utilized to synthesize single-phase Bi2Fe4O9 crystallites. X-ray diffraction results showed the products with PEG 400 of 30 g/L exhibited a preferred growth along the (001) plane. Transmission electron microscopy indicated that the morphology of the as-prepared Bi2Fe4O9 crystallites with PEG 400 were plake-like and rod-like. Strong absorption in visible-light region of the products was characterized by UV-vis diffuse reflectance spectrum (UV-DRS). The photocatalytic activity of Bi2Fe4O9 crystallites was evaluated on degradation of methyl orange (MO) under visible light irradiation. For 3 h irradiation, the degradation ratio was increased to 93% with the aid of a small amount of H2O2. The analysis of FT-IR spectra proved that the Bi2Fe4O9 catalysts were remained stable after the photocalytic reactions.

Highly Improved Photocatalytic Activity of Magnetically Separable Ferroferric Oxide@Zinc Oxide/Carbon Nitride Nanocomposites and Interface Mechanism

NANO ◽  
2021 ◽  
Author(s):  
D. S. Shi ◽  
B. Hong ◽  
J. N. Mao ◽  
S. Y. Song ◽  
C. X. Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Photogenerated Electrons ◽  
Transmission Electron ◽  
Adsorption Desorption ◽  
High Separation

To develop an efficient and recyclable photocatalyst, ternary magnetic Fe3O4@ZnO/g-C3N4 nanocomposites were synthesized for the photodegradation of methylene blue (MB). The microstructures, magnetic response and photocatalytic activity of the as-prepared nanocomposites were characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), N2 adsorption–desorption isotherms and spectrophotometer. All results indicate that ZnO nanoparticles anchor on the surface of Fe3O4 nanoparticles and Fe3O4@ZnO exists on the surface of g-C3N4 to form Fe3O4@ZnO/g-C3N4 nanocomposites. The photocatalytic activity to MB of Fe3O4@ZnO/g-C3N4 nanocomposites is significantly higher than those of pristine g-C3N4 and Fe3O4@ZnO. Owing to the heterojunctions between the interface of g-C3N4 and ZnO, the high separation efficiency of the photogenerated electrons and holes increases the radicals [Formula: see text]OH and [Formula: see text]O[Formula: see text] to photodegrade MB. Fe3O4@ZnO/g-C3N4 (20%) presents the highest MB removal of 93.74% and could be easily separated from solution with magnetic separation method.

scholarly journals Sonochemical Synthesis, Characterization, and Photocatalytic Activity of N-Doped TiO2Nanocrystals with Mesoporous Structure

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Tiekun Jia ◽  
Fang Fu ◽  
Junwei Zhao ◽  
Jian Chen ◽  
Xiaofeng Wang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Visible Region ◽  
Nitrogen Adsorption ◽  
Mesoporous Structure ◽  
Diffuse Reflection Spectroscopy ◽  
X Ray ◽  
Transmission Electron ◽  
Average Size ◽  
Adsorption Desorption

N-Doped TiO2nanocrystals were synthesized via a simple sonochemical route, using titanium tetrachloride, aqueous ammonia, and urea as starting materials. The as-synthesized samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) equipped with an energy dispersion X-ray spectrometer (EDS), transmission electron microscopy (TEM), UV-vis diffuse reflection spectroscopy, Raman spectroscopy, and nitrogen adsorption-desorption isotherms. The results of TEM and nitrogen adsorption-desorption showed that the average size and specific surface area of the as-synthesized nanocrystals are 10 nm and 107.2 m2/g, respectively. Raman spectral characterization combined with the results of XRD and EDS revealed that N dopant ions were successfully doped into TiO2. Compared with pure TiO2, the adsorption band edge of N-doped TiO2samples exhibited an obvious red shift to visible region. The photocatalytic activities were evaluated by the degradation of Rhodamine B (RhB) under visible light, and the results showed that the N-doped TiO2sample synthesized by an optimal amount of urea exhibited excellent photocatalytic activity due to its special mesoporous structure and the incorporation of nitrogen dopant ions.

scholarly journals The Contrastive Research in the Photocatalytic Activity of BiOBr Synthesized by Different Reactants

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Wang Ling-Li ◽  
Ma Wan-Hong ◽  
Wang Shu-Lian ◽  
Zhang Yu ◽  
Jia Man-Ke ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
Removal Rate ◽  
Active Species ◽  
X Ray Diffraction ◽  
Toc Removal ◽  
Transmission Electron ◽  
Uv Visible ◽  
Adsorption Desorption

BiOBr nanoplates, marked asα-BiOBr andβ-BiOBr, were synthesized via hydrothermal method using cetylpyridinium bromide (CPB) and NaBr as reactants, respectively. X-Ray Diffraction (XRD), transmission electron microscope (TEM), N2adsorption/desorption, UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), and cyclic voltammetry (CV) were employed to characterize the obtained BiOBr. The results showed thatα-BiOBr andβ-BiOBr can absorb visible light and both the band gaps of them were about 2.76 eV. Under visible light irradiation, the photodegradation of organic dye sulforhodamine (SRB) and salicylic acid (SA) usingα-BiOBr andβ-BiOBr as the catalysts was carried out. The reaction kinetic constants of the degradation of SRB byα-BiOBr andβ-BiOBr were 0.00602 min−1and 0.0047 min−1, respectively, which indicated that the photocatalytic activity ofα-BiOBr was higher than that ofβ-BiOBr. The UV-Vis DRS and total organic carbon (TOC) were also monitored, and the TOC removal rate ofα-BiOBr andβ-BiOBr was 86% and 48%, respectively. At the same time, hydrogen peroxide (H2O2) and active radicals were measured and analyzed, which showed that the main active species wasOH∙during the photocatalytic reaction.

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.

Preparation of Graphene by Green Reduction Method and Characterization

2013 ◽  
Vol 807-809 ◽  
pp. 515-520 ◽  
Author(s):  
Dong Zhi Chen ◽  
Xue Mei Lin
Keyword(s):  
Electrical Conductivity ◽  
Graphene Oxide ◽  
Graphite Oxide ◽  
Laser Raman Spectroscopy ◽  
X Ray Diffraction ◽  
Ultrasonic Dispersion ◽  
Environment Friendly ◽  
X Ray ◽  
Laser Raman ◽  
Transmission Electron

Graphite oxide was prepared by Hummers method and got graphene oxide by ultrasonic dispersion in water, and using a cheap and environment-friendly fructose as reductant, graphene oxide could be reduced into graphene under mild condition. Meanwhile, the structure and morphology of obtained product was characterized and analyzed by testing methods such as Fourier transform Infrared spectroscopy, X-ray diffraction, Laser Raman spectroscopy, Transmission electron microscope and so on. In addition, the electrical conductivity of obtained graphene was determinated.The experimental results show that graphite oxide can be reduced by fructose under mild conditions and can get graphene with good structure and dispersibility. And the electrical conductivity of graphene prepared by the reduction of graphite oxide with fructose is 35.7 Scm-1, which has great improvement on conducting performance compared with graphite oxide. Moreover, It is non-toxic, non-polluting and friendly to the environment in preparation process of graphene, which lays the groundwork for mass production of graphene materials.

Dye-Sensitized-Assisted, Enhanced Photocatalytic Activity of TiO2/Bi4V2O11

NANO ◽  
2018 ◽  
Vol 13 (03) ◽  
pp. 1850028 ◽  
Author(s):  
Mengjun Liang ◽  
Zhiyuan Yang ◽  
Ying Mei ◽  
Haoran Zhou ◽  
Shuijin Yang
Keyword(s):  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dye Sensitized ◽  
Transmission Electron ◽  
Efficient Charge ◽  
Degradation Activity ◽  
Adsorption Desorption

In this study, the TiO2/Bi4V2O[Formula: see text] nanocomposite photocatalysts were prepared by loading different amount of TiO2 nanoparticles onto the surface of Bi4V2O[Formula: see text] nanospheres via a facile hydrothermal method. Afterwards, the as-synthesized samples were characterized by high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), N2 adsorption–desorption isotherms, X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS) and photocurrent techniques. The optimal TiO2/Bi4V2O[Formula: see text] composite with 20[Formula: see text]wt.% TiO2 loading (TB2) exhibited the best photocatalytic activity, which could degrade almost RhB completely within 30[Formula: see text]min under visible light irradiation. The enhanced photocatalytic activity of TiO2/Bi4V2O[Formula: see text] composites for RhB degradation could be mainly ascribed to the efficient charge separation over dye-induced sensitized and the increased specific surface area. Also, the photocatalytic activities of TiO2/Bi4V2O[Formula: see text] for CIP degradation were tested. After five consecutive recycling experiments, the photocatalytic degradation activity of TB2 could still reach 99% which indicated that the catalysts had superior stability. Based on the experimental and bandgap calculations, a possible photocatalytic mechanism of TiO2/Bi4V2O[Formula: see text] for RhB degradation was proposed.

Study on the Oxidation and Degradation of Phenol Wastewater by Synthetic Cryptomelane

2011 ◽  
Vol 347-353 ◽  
pp. 1358-1361
Author(s):  
Wei Xu ◽  
Guang Ming Li ◽  
Zi Feng Deng
Keyword(s):  
Sewage Treatment ◽  
Microscopic Analysis ◽  
Economic Cost ◽  
Laser Raman Spectroscopy ◽  
Treated Wastewater ◽  
X Ray Diffraction ◽  
Electron Microscopic ◽  
Oxidation Activity ◽  
Laser Raman ◽  
Adsorption Desorption

A well-crystallized cryptomelane-like material (α-MnO2) has been synthesized by redox reaction between Mn2+ and MnO4- under acid condition at certain temperature. This composite material was characterized by X-ray diffraction, volumetric (N2 adsorption-desorption) and scanning electron microscopic analysis, as well as the Laser Raman spectroscopy. Synthetic cryptomelane was used in the oxidation of hydroxylation of phenol in order to study the oxidation activity. The result showed that the degradation rate of 50 mL of 100 mg/L phenol could recch to nearly 100%, under the conditions of pH 2.0, 3 g/L of synthetic cryptomelane with the grain size of 120~160 mesh, and the reaction time of 5 h at room temperature. The treated wastewater has achieved the industrial wastewater discharge standard. Moreover, the economic cost of synthetic cryptomelane was cheaper and the treatment effect of phenol becomed better. Therefore, the synthetic cryptomelane is believed to have a bright prospect in the development of industrial sewage treatment.

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