Controllable Synthesis of One-Dimensional Nanowires and Snowflake-Like Nanostructures via Mixed Solvent Thermal Method.

In this paper, one-dimensional nanowires and snowflake-like nanostructures had been successfully prepared in mixed solvent of glycol and water with using a simple mixed solvent thermal method. The nanowires have a diameter of about 60 nm and lengths of several micrometers. And the aspect ratio of length to diameter is more than 30. When the ratio of glycol to water changed from 10:1 to 1:5, the structures of the final products changed from snowflake-like nanostructures to nanowires. In this experiment, the ratios of glycol to water (10:1, 5:1, 2:1, 1:1, 1:2 and 1:5, respectively) were used. When the ratios were 1:1, 1:2 and 1:5, respectively, the results showed that the products were more close to nanowires structure. And the products were composed of V2O5 and FeVO4. When the ratios were 10:1, 5:1 and 2:1, respectively, it tended to form snowflake-like nanostructures. And the products were composed of V2O5 and Fe2V4O13. The microstructures and morphologies were investigated via transmission electron microscopy (TEM). And the compositions of the products were confirmed by X-ray diffraction (XRD).

Preparation of Porous ZnO Sheet in Aniline-Water Mixed Solvents and Its Application.

In this paper, porous ZnO sheet with an average pore size of 14.7 nm had been successfully prepared via mixed solvent thermal method without any surfactants. The mixed solvents were made up of water and aniline. The effect of calcination temperature on the structure was investigated. The results showed that when the calcination temperature was 350 °C, the porous structure formed and the borders of the as-formed porous structure sheets were heavily regular and straight. The photocatalytic properties of products were studied through detecting the degradation efficiency of RhB under the 500 W mercury lamp irradiation. The effects of calcination temperature and catalyst concentration of the products on photocatalytic efficiency were investigated in detail. When the precursor was calcined at 350 °C for 4 h, the photodegradation efficiency of RhB can be up to 100% after irradiating for 60 min. The morphologies and compositions of the as-prepared products were characterized via transmission electron microscopy (TEM) and X-ray diffraction (XRD).

Synthesis of LiMnPO4 porous plates in mixed solvents system.

0.6 to 7.5 microm LiMnPO4 porous plates with pore sizes from 100 to 150 nm were successfully synthesized in mixed solvents of ethylene glycol and distilled water. By changing stirring time, different morphologies of LiMnPO4 were prepared. Porous plates with the percentages of more than 70%, more than 50% and 25% porous ones were formed in sequence. The according rest parts were particles, less than 40% solid plates and 25% solid ones, respectively. Stirring time is the key cause influencing the nucleation rate and diffusion rate of the initial formed growth units of LiMnPO4. Through adjusting the factor, chemicals with specific morphology can be obtained in mixed solvents. The phase composition and microstructure were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. This synthetic route provides us a new idea to prepare new structure materials.

Synthesis of porous ZnO in mixed solvents system.

Three porous structures of ZnO were successfully synthesized in mixed solvents of ethylene glycol and distilled water. By adjusting ratios of ethylene glycol and distilled water, ZnO morphologies changed. Small porous plates with different sizes, folded porous plates with well-proportioned pores, heavily folded porous plates and solid flowers without pores emerged in sequence. The mechanism of the synthetic process was discussed. The morphologies and microstructures were investigated by transmission electron microscopy (TEM). The phase composition was verified by X-ray diffraction (XRD). This synthetic route provides a new idea to prepare other new structure materials.

Synthesis of LiMnPO4 porous structures under mixed solvents system.

Porous structure LiMnPO4 with pore size from 4 to 9 nm was successfully synthesized in mixed solvents. By changing ratios of glycerol to distilled water and stirring time, LiMnPO4 morphologies were adjusted. Shuttles with different sizes and porous structure of LiMnPO4 were formed in sequence. Ratio of glycerol to distilled water influences the solubility of LiMnPO4 and solutions viscosity. This factor and stirring time are both causes influencing the nucleation rate and diffusion rate of the initial formed particles of final products. Through adjusting these factors, chemicals with specific morphology can be obtained. The phase composition was investigated by X-ray diffraction (XRD), and the microstructure was verified by transmission electron microscopy (TEM). This synthetic method provides us a new idea to obtain new structure materials.

Mixed-solvent thermal synthesis of porous LiFePO4.

Porous structure LiFePO4 with pore size from 2 to 15 nm was successfully synthesized in mixed solvents system of glycol and water. By changing stirring time from 5 to 60 min, LiFePO4 morphologies were adjusted and percentage of porous LiFePO4 was higher and higher in sequence. Stirring time is the key cause of controlling morphologies of final products for its influence on diffusion rate of the initial formed particles of final products. Through adjusting this factor, products with specific morphologies and functions can be obtained. The morphologies and microstructures were observed by transmission electron microscopy (TEM), and the phase composition was verified by X-ray diffraction (XRD). This synthetic method provides a new route to obtain porous structure materials.

Synthesis of Oxygen-Rich Bismuth Oxybromide (Bi24O31Br10) Photocatalyst for High Efficiency Degradation of Sulfadiazine Under Simulated Sunlight.

At present, compared with other antibiotic degradation systems, there are few literatures on pho- tocatalytic degradation of sulfadiazine (SDZ). In this research, it was firstly discovered that the oxygen-rich bismuth oxybromide (Bi24O31 Br10) photocatalyst can efficiently degrade SDZ under simulated sunlight. In this paper, the prepared Bi24O31Br10 photocatalyst by mixed solvothermal method represented outstanding photocatalytic performance. The catalyst synthesized at 120 °C and pH = 10 showed optimum degradation function in the samples prepared at various temperatures and pH value. After 3 h of irradiation, 96.2% of SDZ solution could be decomposed. The effects of preparation conditions, catalyst dosage, initial SDZ concentration and initial SDZ pH value on photocatalytic degradation efficiency were investigated systematically. Besides, the effect of active species was studied by trapping tests, and it was concluded that 'O2 contributes the most to the photocatalytic process. A possible photocatalytic degradation mechanism was proposed.

Controllable Synthesis of Flower-Like MoS2 and Its Quick Photodegradation of Methylene Blue Under Visible Irradiation.

Molybdenum disulfide (MoS2) was synthesized via hydrothermal process under the assistance of citric acid, which exhibited high photocatalytic property in the application of methylene blue (MB) degradation. The flower ball microstructure of MoS2 changed with different amounts of citric acid. X-ray diffraction (XRD), Scanning electron microscope (SEM), UV-Vis diffuse reflectance spectra have been employed to characterize the samples. It improved the photocatalytic efficiency nearly 19.77% compared to MoS2 without citric acid. When H2O2 was added, the synergistic effect of MoS2 and hydrogen peroxide (H2O2) was observed in photocatalytic reaction system, which degraded MB completely within 40 min under visible light irradiation.

One-Pot Hydrothermal Synthesis of g-C3N4/BiPO4 Nanocomposites with Significant Photocatalytic Activity.

The g-C3N4/BiPO4 composites have been successfully synthesized via a one-pot hydrothermal process, which can be used to degrade the organic dyes (rhodamine B and methylene blue) under simulated sunlight irradiation. X-ray diffraction (XRD), scanning electron microscope (SEM), UV-Vis diffuse reflectance spectra and Fourier transform infrared (FTIR) spectroscopy have been employed to characterize the samples. The g-C3N4/BiPO4 composites exhibited higher photocatalytic activity than pure BiPO4. And the optimum photocatalyst shows the outstanding photocatalytic activity, which exhibited 99.0% and 86.6% decolorization rate of RhB and MB, respectively.

A One-Pot Hydrothermal Synthesis of Eu/BiVO4 Enhanced Visible-Light-Driven Photocatalyst for Degradation of Tetracycline.

Eu/BiVO4 photocatalyst was synthesized by a facile one-step hydrothermal method. The structures and morphologies of Eu/BiVO4 photocatalysts were investigated by XRD, SEM and FT-IR and their photocatalytic activity was evaluated by the degradation of tetracycline hydrochloride (TCH) under the visible light irradiation. From the photocatalytic activity test, 1% Eu/BiVO4 displayed more superior photodegradation efficiency with 91.4% degradation efficiency of TCH in 150 min by contrast with 77.3% degradation rate of pure BiVO4. The mechanism has been explored that h+ is the primary active species, and ·OH is a secondary active substance in the photocatalytic process.

Progress on Synthesis and Applications of Cr2O3 Nanoparticles.

As is known to us that nanosized chromic oxide (Cr2O3) is an important transition metal oxide. Because it has many excellent properties, it can be used in many fields such as pigment, catalyst, Lithium material etc. This article briefly reviewed the preparation and applications of Cr2O3 nanoparticles. In this paper, some specific applications will be listed according to different fields. Nanosized chromic oxide (Cr2O3) can be obtained via many methods. A summary of the methods have been made. The preparation methods are divided into three main types, including vapor phase method, solid phase method and liquid phase method. Simultaneously, different types of methods have been simply evaluated in this paper. And the advantage and disadvantage are simply noted.