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????? Orange tungsten oxide is a compound usually referred to as a non-stoichiometric oxidation state of tungsten oxide with the chemical formula WO3. However, it is orange in color. This orange color originates from defects or impurities in the crystal structure of tungsten oxide, or from the presence of low valence tungsten ions due to partial reduction. Tungsten oxide is usually yellow or green, but under certain conditions (e.g. heat treatment or partial reduction) it can take on an orange,…

Mo-doped tungsten trioxide nanorod may be prepared by hydrothermal method on FTO conductive glass coated with a TiO2 crystal seed layer, which adopts sodium tungstate dihydrate and sodium molybdate dihydrate as main raw materials under different hydrothermal growth conditions (at 180°C, hydrothermal growth time of 5h or 6h). The microstructure, composition and electrochromism performance of the obtained WO3 nanorod at different hydrothermal growth times were studied by means of scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction…

Orthorhombic tungsten trioxide nanoflake may be prepared by hydrothermal method. And the influencing factors on the photocatalytic reaction were studied using photocatalytic degradation of methylene blue by the synthesized WO3 as model. And the photocatalytic properties of orthorhombic WO3 nanoflake were studied by determining the chemical oxygen demand (COD) of methine blue before and after photocatalytic degradation by potassium dichromate method. Hydrothermal Method to Prepare Orthorhombic Tungsten Trioxide Nanoflake The chemical reagents used were of analytical grade and were not…

Monoclinic tungsten trioxide nanoflake may be prepared by chemical precipitation method. Chemical Precipitation Method to Prepare Monoclinic Tungsten Trioxide Nanoflake The chemical reagents used are all analytical reagents (AR) and not purified before use. 1. Weigh 3.0g Na2WO3 and 0.005g CTAB (cetyl trimethyl ammonium bromide), dissolved in 10mL distilled water. Slowly drop 3mL of this solution into 5mL 3mol?L-1 HCL and stir for 1 ~2h. 2. After centrifugal settling of the reacted solution, wash it repeatedly with distilled water and…

Tungsten trioxide nanoflake has potential application prospects in the treatment of organic dye contaminated water. Why does tungsten trioxide nanoflake have potential application prospects in the treatment of organic dye pollution water? The sewage discharge in China is large, and the sewage treatment rate in urban is only 30%, which means that a large amount of untreated sewage is discharged directly to become a secondary source of pollution to the environment, therefore most of the rivers, lakes and urban groundwater…

Tungsten oxide nanorod may be prepared through a hydrothermal process at 180°C by using sodium sulfate (Na2SO4) as a directing reagent, and may be applied in the photocatalytic degradation of RB under visible light irradiation. Synthesis of Tungsten Trioxide Nanorod 1. Dissolve 2.77g sodium tungstate and 4.77g Na2SO4 in 67.5ml water and stir completely. 2. Adjust the pH to 1.5 with 3mol/L hydrochloric acid (HCL) and stir for 30min. 3. Heat the above solution at 180°C for 48 h. 4.…

Hexagonal tungsten trioxide nanowire may be synthesized by hydrothermal method using Na2WO4?2H2O and HCl as raw materials, K2C2O4 and K2SO4 as structure-directing agents respectively. The hydrothermal reaction was conducted at 150°C for 12h. The structure of hexagonal WO3 nanowire obtained presents complex net structure with higher specific surface area, which improves the photocatalytic activity of the material. The presence of two additives, K2C2O4 and K2SO4, proved that K+ plays an important role in guiding the growth of WO3 nanowire. The…

Tungsten oxide nanowire may be prepared by hydrothermal method using Na2WO4?2H2O and HCl as raw materials with Na2SO4 as additive． Hydrothermal Method to Prepare Tungsten Trioxide Nanowire 1. Weigh 3.68g (0.011mol) Na2WO4?2H2O into 20ml deionized water and stir it to dissolve; 2. Add 3M HCl to the above solution dropwise, stir it until the white precipitate no longer generated, and adjust the pH≈1; 3. Add in certain amount of 0.5M Na2SO4, continue to stir for 2h and transfer the solution…

Tungsten oxide nanotube requires extra coating and etching processes if it is prepared by traditional producing methods, whose quality greatly depends on the control of processing steps. Therefore, the hollow WO3 nanofibers may be directly manufactured by using the coaxial electrospinning technology to simplify the process. Principle of Coaxial Electrospinning Technology The hollow nanotube is generally obtained by coaxially electrospinning readily soluble or volatile substance and then removing the core layer by dissolving or heating. In general, mineral oil and…

84% yellow tungsten oxide may be used to produce high quality ultrafine tungsten carbide (WC) powder by carbonization method. The producing processes are shown as follows: 1. Mix yellow tungsten oxide (mass fraction of 84%) and carbon (mass fraction of 16%) by mixer, and granulate to particle (grain size of 3mm) by granulator, then dry and mixed material is obtained. 2. Move material to the rotary furnace for continuous reduction/carbonization, the original material changes during the reaction: WO3→WO2.9→WO2.72→WO2.0→W→W2C→WC WO3 was…