65results about How to "Crystal phase pure" patented technology

A ZSM-11 molecular sieve with a hierarchical porous structure is characterized in that X-X-ray diffraction spectrum of the molecular sieve is as shown in Figure 1(a) / table 1; the molecular sieve has an even spherical appearance, each ball is formed through self assembly of rod-shaped crystallites (Figure 2), the molecular sieve is formed by evenly mixing raw materials of substance containing IVA elements, substance containing IIIA element, alkali metal hydroxide, template and water, and then through two stages of crystallization processes, the molecular sieve product has pure crystalling phase, is relatively high in degree of crystallinity, and has an excellent heat and water heat stability, namely, the method is relatively low in cost, the performance of the ZSM-11 molecular sieve is excellent, and the method is suitable for industrialized production.

The invention relates to a preparation method for fluorine and lanthanum codoped nanometer TiO2 visible-light photocatalyst, in which titanium alkoxide, lanthanum nitrate and fluoride are used as the raw materials. First, the fluoride is dissolved in the water, and then the titanium alkoxide and the lanthanum nitrate absolute ethyl alcohol solutions are dipped into the fluoride water solution while stirring, and finally the monodisperse TiO2 sol is obtained after stirring at room temperature for a certain period of time for hydrolyzation. Then the TiO2 sol is dried to obtain light-yellow gel which can produce the nanometer TiO2 photocatalyst while calcined at different temperatures. The method has mild and easily-controlled reaction conditions, simple equipment, easily purchased raw materials, simple synthesized process and easy industrial production. And the prepared fluorine and lanthanum codoped nanometer TiO2 photocatalyst has the properties of high specific surface, pure crystal phase, multiple surface acidity points and visible light response.

The invention discloses a preparation method of iron phosphate for preparing lithium iron phosphate material, and relates to heavy metal phosphate. The steps of the method are as follows: analyticallypure soluble molysite is dissolved in distilled water, thereby being prepared into 0.05 to 5 M water solution, and being added with anionic surface-active agent with the mass being 0.01 to 3 percentof the mass of the molysite, then analytically pure phosphoric acid is added according to the mol ratio of Fe<3+>:PO4<3-> equal to 1:0.8 to 1.2 and stirred, alkaline solution with the concentration of1 to 9 M is slowly added in stirring state, the adding time is more than 1 hour until the Ph value of the solution reaches 6 to 7, the deposited matter of iron phosphate is filtered, the filtered iron phosphate is cleaned for 3 to 5 times with distilled water with the 2 to 5 times weight of the iron phosphate, the iron phosphate is dried in the range of 60 to 90 DEG C under a vacuum condition, and the finished FePO4.2H2O powder is gotten. The iron phosphate product with two crystal water prepared by the invention has high reaction activity, and the performance of the lithium iron phosphate material prepared with the iron phosphate product is superior to the lithium iron phosphate material prepared with the commercial iron phosphate product.

The invention relates to a self-assembled nano film MnO2 adsorption agent capable of high-efficiently adsorbing heavy metals and a preparation method of the adsorption agent, and belongs to the field of metal environmental protection. The adsorption agent has a nano film grading layered structure, in the size of 700 nanometers, which is formed by self-assembling sheets in the thickness of 2 to 3 nanometers. The preparation method comprises the following steps of dissolving KMnO4, NH4H2PO4 and Na2SO4.10H2O into deinoized water and mixing, reacting at a constant temperature in a reaction kettle, washing precipitates, drying the precipitates and the like. Raw materials of the absorption agent are cheap and easily available, the reaction condition is simple, the energy consumption is low, the adsorption agent has a good effect for removing heavy metal ions in an acid medium, and the application prospect is wide.