The layered titanium oxide is a useful and unique precursor for the facile and rapid preparation of the peroxide layered titanium oxide H1.07Ti1.73O4·nH2O (HTO) crystal with enhanced visible light photoactivity. The H2O2 molecules as peroxide chemicals rapidly enter into the interlayers of HTO crystal, and coordinate with Ti within TiO6 octahedron to form a mass of Ti-O-O coordination bond in the interlayers. The introduction of these Ti-O-O coordination bonds result in lowering the band gap of HTO, and promoting the separation efficiency of the photo induced electron–hole pairs. Meanwhile, the photocatalytic investigation indicates that such peroxide HTO crystal has the enhanced photocatalytic performance for RhB degradation and water splitting to generate oxygen under visible light irradiating.

/pdf/ti-o-o-coordination-bond-caused-visible-light-photocatalytic-15fn1sgaev.pdf

Ti-O-O coordination bond caused visible light photocatalytic property of layered titanium oxide.

Intense low threshold nonlinear absorption and nonlinear refraction in a new organic–polymer nanocomposite

This paper introduces the formation reactions and reaction mechanisms of a series of potassium niobates from a potassium salt of the Lindquist hexaniobate [Nb6O19]8− ion under solvothermal conditions. The structure and particle morphology of the potassium niobate product can be controlled easily with the reaction solution alkalinity using this solvothermal process. KNb3O8 with a plate-like morphology, K4Nb6O17·4.5H2O with a plate-like morphology, a new phase of K2Nb2O6·H2O with fibrous morphology, KNbO3 perovskites with cubic morphology are obtained at pH = 5.5, and in 0.3, 0.5, 1.0 mol L−1 KOH solutions at 230 °C, respectively. The reaction conditions are much milder than those in the normal hydrothermal process. Furthermore, the K2Nb2O6·H2O fibers can be topotactically transformed into KNbO3 fibers, Nb2O5 fibers after H+-exchange-treatment, and LiNbO3 fibers after Li+-exchange-treatment by heat-treatments at 730, 560, and 520 °C, respectively. The formation reaction and structure of these potassium niobates were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), energy-dispersive spectroscopy (EDS), Raman spectra and TG-DTA. The formation mechanism of this series of potassium niobates from the [Nb6O19]8− precursor is systematically explained via the correlation between the octahedrons [NbO6] sharing forms in the precursor structure and in the product structures.

Transformation of potassium Lindquist hexaniobate to various potassium niobates: solvothermal synthesis and structural evolution mechanism

Surface engineering induced superstructure Ta2O5-x mesocrystals for enhanced visible light photocatalytic antibiotic degradation.

Al2O3 doped Mn3O4 nanomaterial was synthesized by low-temperature stirring method and applied as a catalyst for the degradation of organic pollutants under solar light for prospective environmental applications. The morphological and physiochemical structure of the synthesized solar photocatalyst was investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). FESEM showed a mixture of nanowires and aggregated nanoparticles. This Al2O3 doped Mn3O4 nanomaterial exhibited high solar photocatalytic degradation in a short time when applied to brilliant cresyl blue (BCB). Thus, the synthesized nanoparticles can be used as an efficient solar photocatalyst for the degradation of BCB.

/pdf/visible-light-functioning-photocatalyst-based-on-al2o3-doped-3h7fqb3dg9.pdf

Visible light functioning photocatalyst based on Al2O3 doped Mn3O4 nanomaterial for the degradation of organic toxin

This paper introduces a Ba0.5(Bi0.5K0.5)0.5TiO3 (BBKT) platelike particle constructed from cuboidlike nanocrystals which arrange in the same crystal-axis-orientation direction. This platelike parti...

Solvothermal Soft Chemical Synthesis and Characterization of Nanostructured Ba1–x(Bi0.5K0.5)xTiO3 Platelike Particles with Crystal-Axis Orientation

A novel two-step process has been developed for the preparation of Ba0.9Ca0.1TiO3 plate-like grains with [110]-crystal-axis-orientation. In the first step, plate-like particles of a layered titanate H1.07Ti1.73O4 are solvothermally treated in a Ba(OH)2–Ca(OH)2 mixed solution, and then in the second step, heat-treat the solvothermally treated sample to complete the formation reaction of Ba0.9Ca0.1TiO3. The formation reaction and nanostructure of the Ba0.9Ca0.1TiO3 plate-like grains were characterized using X-ray diffraction, FE-SEM, TEM, and SEAD. The Ba0.9Ca0.1TiO3 plate-like grains are constructed from spherical nanoparticles with particle size of about 10–20 nm. The spherical nanocrystals in each plate-like grain arrange in the same crystal-axis-orientation direction, which presented a diffraction pattern similar to the single crystal. The Ba0.9Ca0.1TiO3 plate-like grains were utilized to fabricate an oriented Ba0.9Ca0.1TiO3 ceramic to demonstrate the potential application of the plate-like grains, and the [110]-oriented Ba0.9Ca0.1TiO3 ceramic with a high degree orientation of F110 = 76% and small grain size of about 1–2 μm was obtained.

Preparation of Crystal-Axis-Oriented Barium Calcium Titanate Plate-Like Particles and Its Application to Oriented Ceramic

The invention discloses a method for preparing carbon-doped zinc oxide microsphere with a multilevel structure The method comprises the following steps: dissolving zinc gluconate into water to obtain a zinc gluconate solution; regulating the pH value of the zinc gluconate solution and performing ultrasonic treatment; putting the zinc gluconate solution into a microwave hydrothermal synthesizer to perform synthetic reaction; naturally cooling to room temperature after the reaction is finished, so as to obtain an intermediate product; performing centrifugal separation on the intermediate product to obtain a solid; calcining the solid to obtain the carbon-doped zinc oxide microsphere with the multilevel structure The zinc oxide microsphere is assembled by nanometer zinc oxide particles, and the diameter of the zinc oxide particles is 30-50nm and the diameter of the zinc oxide microsphere is 1-10 microns In addition, the prepared carbon-doped zinc oxide microsphere has a multipore loosened structure, is high in specific surface area and high in controllability of carbon doping content, can be used in the fields of photocatalysis of visible light and solar utilization and has application prospect

Method for preparing carbon-doped zinc oxide microsphere with multilevel structure

The invention discloses a method for preparing a CoWO4 nano powder material by adopting a microwave-hydrothermal method. The method comprises the following steps: preparing CoWO4 nano powder by adopting a microwave-hydrothermal method; taking Co(NO3)2.6H2O as a cobalt source, taking Na2WO4.2H2O as a tungsten source, wherein the molar ratio is 0.8-1.5; dissolving two raw materials into deionized water, and evenly stirring the solution by using a magnetic stirring apparatus, so as to obtain a transparent and homogeneous liquid precursor; sequentially utilizing HNO3 and NaOH to adjust the pH value of the liquid precursor to 5-10; filling the liquid precursor into a reaction kettle, controlling the filling ratio range at 40-50%, and reacting for 60-120 minutes within the temperature range of 150-190 DEG C; taking out a product after reaction is ended, repeatedly cleaning the product by using the deionized water and absolute ethyl alcohol sequentially and then drying, so as to obtain the target product. The method has the advantages of being quick to react, short in time, high in purity, and efficient and controllable in reaction process, and has good maneuverability.

Method for preparing CoWO4 nano powder material by adopting microwave-hydrothermal method

The nonlinear refraction sign turned to reverse by intercalating cresyl violent dye into layered titanate nanosheets

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