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Preparation method of monodisperse alpha-Fe2O3@TiO2 ellipsoids

A monodisperse, ellipsoidal technology, applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Achieve the effect of improving purity and photocatalytic performance

Pending Publication Date: 2020-04-17
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the previous research reaction systems, most of the cases where TiO2 was stuck to varying degrees, and free TiO2 also appeared in the system. 2 , these will reduce the photocatalytic activity of the catalyst

Method used

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  • Preparation method of monodisperse alpha-Fe2O3@TiO2 ellipsoids

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specific Embodiment approach 1

[0021] The first embodiment is a monodisperse α-Fe 2 o 3 @TiO 2 The preparation method of the ellipsoid is specifically completed in the following steps:

[0022] 1. Dissolve a certain mass of ferric chloride and ammonium dihydrogen phosphate in equal volumes of deionized water, stir evenly at room temperature, and record as solution A and solution B. Mix solutions A and B evenly to obtain a reaction solution, then transfer the reaction solution to a PTFE reactor, seal it and put it in an oven at a certain temperature to heat for a period of time, after the reaction is completed, wash it with centrifugal ultrasonic for several times until the upper layer solution is clear , collect the lower layer of sediment and dry it to constant weight, that is, α-Fe 2 o 3 Spindle shaped particles.

[0023] The concentration of ferric chloride in solution A described in step 1 is 0.02~0.06moL / L, and the mass ratio of ferric chloride to ammonium dihydrogen phosphate in the reaction solu...

specific Embodiment approach 2

[0035] The difference between this embodiment and specific embodiment one is: the concentration of ferric chloride in solution A described in step 1 is 0.03 ~ 0.05moL / L, the mass of ferric chloride and ammonium dihydrogen phosphate in the reaction solution The ratio is (92~127): 1; the volume ratio of the reaction kettle described in step 1 to the reaction solution is (3~4): 1; the heating temperature of the oven described in step 1 is 110~140°C, The heating time is 10~16h. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] The difference between this embodiment and the specific embodiment one or two is: the α-Fe in the homogeneous solution described in step 2 2 o 3 The concentration of spindle-shaped particles is 5.5×10 -4 ~1.5×10 -3 g / mL; add a certain amount of polyvinylpyrrolidone described in step 2 as α-Fe 2 o 3 7 to 11 times the mass of the spindle-shaped particles, and continuously stirred for 7 to 11 hours at a reaction temperature of 35 to 55°C; the volume fraction of tetrabutyl titanate in the reaction system in step 2 is 0.6% to 2.9%; in step 2 The use of a constant pressure dropping funnel to add the diluted ammonia water dropwise is to dilute the ammonia water 12 to 28 times with absolute ethanol, the volume fraction of the ammonia water in the reaction system is 0.4% to 2.9%, and the dropping rate is 1.2 to 2.8% s / d, reaction 7~11h. Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention discloses a preparation method of monodisperse alpha-Fe2O3@TiO2 ellipsoids, and relates to a preparation method of a functional microsphere. The method comprises the following steps: 1,uniformly mixing an aqueous ferric trichloride solution and an aqueous ammonium dihydrogen phosphate solution which are respectively prepared, and reacting by adopting a hydrothermal synthesis technology to obtain alpha-Fe2O3 spindle-shaped particles; 2, modifying the surfaces of the alpha-Fe2O3 particles with polyvinylpyrrolidone, and synthesizing monodisperse alpha-Fe2O3@TiO2 core-shell ellipsoidal particles in the same reaction system by using a technology of dynamically controlling the instantaneous addition amount of a catalyst ammonia water; and 3, carrying out high-temperature calcination treatment. The alpha-Fe2O3@TiO2 ellipsoidal particles obtained in the invention are good in monodispersity, few titanium dioxide byproducts exist in the product, and the operation method is simple,convenient and repeatable.

Description

technical field [0001] The invention relates to a method for preparing functional microspheres, in particular to a monodisperse α-Fe 2 o 3 @TiO 2 Ellipsoid preparation method. Background technique [0002] As a common semiconductor photocatalyst, anatase phase nano-titanium dioxide has the advantages of excellent photocatalytic activity, good thermal stability and low cost, and is considered to be the most suitable catalyst for industrial production. However, titanium dioxide has the disadvantage of wide bandgap, and its photocatalysis only responds under ultraviolet light, so it cannot effectively utilize solar energy. [0003] In addition, among many photocatalysts studied, α-Fe 2 o 3 As a narrow bandgap n-type semiconductor, it is usually used as a photocatalyst driven by visible light. However, in the single-component α-Fe 2 o 3 In materials, photogenerated electrons and holes are easy to recombine, which hinders its application in photocatalysis. [0004] In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J35/00B01J35/08B01J37/00B01J37/08
CPCB01J23/745B01J37/0018B01J37/082B01J35/397B01J35/51B01J35/39
Inventor 张鑫李满园高倩牛永安
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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