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.

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.

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.

scholarly journals MesoporousTiO2Micro-Nanometer Composite Structure: Synthesis, Optoelectric Properties, and Photocatalytic Selectivity

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Kun Liu ◽  
Lianjie Zhu ◽  
Tengfei Jiang ◽  
Youguang Sun ◽  
Hongbin Li ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Composite Structure ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
Sunlight Irradiation ◽  
X Ray ◽  
Transmission Electron ◽  
Structure Synthesis ◽  
Ft Ir ◽  
Adsorption Desorption

Mesoporous anatase TiO2micro-nanometer composite structure was synthesized by solvothermal method at 180°C, followed by calcination at 400°C for 2 h. The as-prepared TiO2was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and Fourier transform infrared spectrum (FT-IR). The specific surface area and pore size distribution were obtained from N2adsorption-desorption isotherm, and the optoelectric property of the mesoporous TiO2was studied by UV-Vis absorption spectrum and surface photovoltage spectra (SPS). The photocatalytic activity was evaluated by photodegradation of sole rhodamine B (RhB) and sole phenol aqueous solutions under simulated sunlight irradiation and compared with that of Degussa P-25 (P25) under the same conditions. The photodegradation preference of this mesoporous TiO2was also investigated for an RhB-phenol mixed solution. The results show that the TiO2composite structure consists of microspheres (∼0.5–2 μm in diameter) and irregular aggregates (several hundred nanometers) with rough surfaces and the average primary particle size is 10.2 nm. The photodegradation activities of this mesoporous TiO2on both RhB and phenol solutions are higher than those of P25. Moreover, this as-prepared TiO2exhibits photodegradation preference on RhB in the RhB-phenol mixture solution.

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.

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.

Preparation and Photodegradation of Humic Acid by a Y3+-Doped ZnO/TiO2 Composite

2010 ◽  
Vol 44-47 ◽  
pp. 2312-2315
Author(s):  
Zhi Ping Zhu ◽  
Yi Zhou
Keyword(s):  
Humic Acid ◽  
Solid Phase ◽  
Synthesis Method ◽  
Pure Tio2 ◽  
Utilization Efficiency ◽  
Diffuse Reflection Spectroscopy ◽  
X Ray Diffraction ◽  
Sunlight Irradiation ◽  
Transmission Electron ◽  
Doped Zno

Aim to remove soluble humic acid (HA) in super-critical boiler make-up water, Y3+-doped ZnO/TiO2 composites were prepared using a solid-phase synthesis method, Their properties were characterized by x-ray diffraction, transmission electron microscopy, and UV-visible diffuse reflection spectroscopy (DRS); their visible light photoactivities were evaluated by the photodegradation of humic acid in an aqueous solution under sunlight irradiation.. The experiment results showed that Y3+-doped samples had a higher absorbance than pure TiO2, and a red shift appeared in the DRS spectrum; The Y3+-doped ZnO/TiO2 multiplex nanocomposite can expand the wavelength range for light absorption and increase the sunlight utilization efficiency. Samples with 3% Y3+ and 27% ZnO have the highest photoactivities.

Synthesis, Characterization and Performance of Ce0.8La0.2O1.9-ATP Composite Catalyst for Phenol Catalytic Oxidation

2011 ◽  
Vol 311-313 ◽  
pp. 1427-1431 ◽  
Author(s):  
Xiao Bing Zhao ◽  
Jing You ◽  
Chao Jin ◽  
Xia Zhang Li ◽  
Zhi Gang Chen
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Laser Raman Spectroscopy ◽  
Precipitation Method ◽  
Composite Catalyst ◽  
X Ray Diffraction ◽  
Laser Raman ◽  
Transmission Electron ◽  
And Performance ◽  
Co Precipitation ◽  
Average Size

Ce0.8La0.2O1.9-attapulgite (Ce0.8La0.2O1.9-ATP) nanocomposite materials were synthesized by co-precipitation method. The microstructure and phase composition of the as-prepared samples were characterized by X-ray diffraction (XRD), Laser Raman spectroscopy (LRS), energy-dispersive spectrometer (EDS) and transmission electron microscopy (TEM). The redox properties of samples were investigated by phenol oxidation experiment. The results indicated that La3+ ions incorporated into CeO2 lattice and formed solid solution. The Ce0.8La0.2O1.9 particles with average size of about 10 nm were loaded onto the ATP and were widely dispersed. The catalytic activity was improved when La3+ was introduced. The catalytic property of Ce0.8La0.2O1.9-ATP nanocomposites for phenol was better than that of CeO2 and CeO2-ATP.

Absorbing Manganese Oxide on Multi-Walled Carbon Nanotubes

2007 ◽  
Vol 121-123 ◽  
pp. 85-88
Author(s):  
Xian Ping Huang ◽  
Chun Xu Pan
Keyword(s):  
Carbon Nanotubes ◽  
Laser Raman Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Laser Raman ◽  
Transmission Electron ◽  
Mno2 Nanoparticles ◽  
Multi Walled Carbon Nanotubes ◽  
Cnts Surface ◽  
Walled Carbon Nanotubes

A layer of Manganese dioxides (γ-MnO2) was absorbed upon carbon nanotubes (CNTs) surface by using a chemical deposit process. The morphologies of the MnO2/CNTs composite were characterized using transmission electron microscopy (TEM), energydispersive X-ray spectrometry (EDS), X-ray diffraction (XRD) and laser Raman spectroscopy (RS). It is found that absorbed layer belongs to the γ-MnO2 nanoparticles in size about 10 nm, and coated homogeneously around the CNTs. It is expected that this MnO2/CNTs composite will be widely applied to make supercapacitors.

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.

Behaviours of direct yellow 12 adsorption on mesoporous carbons with different pore geometries

2018 ◽  
Vol 2017 (1) ◽  
pp. 219-228
Author(s):  
Fengling Liu ◽  
Ziyan Guo ◽  
Hui Qiu ◽  
Xia Lu ◽  
Hua Fang ◽  
...  
Keyword(s):  
Mesoporous Carbons ◽  
X Ray Diffraction ◽  
Pore Characteristics ◽  
X Ray ◽  
Transmission Electron ◽  
Cylindrical Pores ◽  
Pseudo Second Order ◽  
Hexagonally Ordered ◽  
Adsorption Desorption ◽  
Interconnected Pore

Abstract Four kinds of mesoporous carbons, C1-h-w, C2-h-h, C3-s-w, and C4-s-h, with different pore geometries were prepared and characterised, and their adsorption behaviours with aqueous direct yellow 12 (DY-12) were investigated. The results of X-ray diffraction and transmission electron microscopy show that C1-h-w and C3-s-w have wormlike pore characteristics, whereas C2-h-h and C4-s-h have 2-D hexagonally arranged pores. According to the N2 adsorption/desorption results, the specific surface area of C1-h-w (1,378 m2/g) is the largest among the four carbons. The adsorption isotherms could be effectively fitted using the Langmuir model. The maximum adsorption amounts of C1-h-w, C2-h-h, C3-s-w and C4-s-h are 0.968 mmol/g, 0.726 mmol/g, 0.161 mmol/g and 0.156 mmol/g, respectively. The pseudo-second-order rate constants of C1-h-w (39.8 g/(mmol·min)) and C2-h-h (7.28 g/(mmol·min)) are substantially larger than those of C3-s-w (0.0046 g/(mmol·min)) and C4-s-h (0.014 g/(mmol·min)), indicating that an open and interconnected pore geometry is favourable for DY-12 adsorption. Furthermore, DY-12 diffusion in 2-D hexagonally ordered cylindrical pores is superior to that in wormlike pores due to the smoothness of the channels in the former. External mass transfer and intraparticle diffusion both play roles in the adsorption process.

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