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Industrial preparation method of non-oxidative cerium oxide nanoparticles

A nano-particle, non-oxidizing technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problems of cost increase, production waste treatment volume, low catalytic activity, etc., and achieve easy dispersion, good dispersion, The effect of short process flow

Inactive Publication Date: 2011-01-19
YANTAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent CN 101511328A, the surface of titanium oxide, zinc oxide or cerium oxide particles is coated with silicon dioxide in two steps. First, the first step is carried out through the hydrolysis and condensation reaction of sodium silicate in the suspension or sol of the particles. Silica coating, after filtering and washing, use tetramethoxysilane for the second step of silica coating, and finally obtain surface-modified low catalytic activity UV absorbing particles; in this coating route, a complex two-step The coating step is to completely cover the surface with silica, and the complicated surface coating route increases the cost of production and the amount of production waste to be processed

Method used

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  • Industrial preparation method of non-oxidative cerium oxide nanoparticles
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  • Industrial preparation method of non-oxidative cerium oxide nanoparticles

Examples

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Embodiment 1

[0038] Example 1 Industrialized preparation of cerium oxide nanoparticles: the raw material is cerium chloride, using methanol as a solvent, configured into a transparent salt solution with a concentration of 0.5M, and then adding an organic gelling agent propylene oxide with a molar ratio of 5 to cerium ions , after mixing evenly, the solution was placed in a water bath at 50°C and stirred for 1 hour, and the obtained sol was dried at 80°C until a xerogel was obtained, and loose non-surface-modified CeO was obtained after light grinding. 2 Nanoparticles.

Embodiment 2

[0039] Example 2 Industrial preparation of cerium oxide nanoparticles: ethanol is used as solvent, and the others are the same as in Example 1.

Embodiment 3

[0040] Example 3 The industrialized preparation of non-oxidizing cerium oxide nanoparticles: the CeO obtained in Example 2 2 Nanoparticles and CeO 2 After the surface modifier sodium metasilicate of 50% by weight is ground and mixed evenly, add an additive with a molar ratio of 1 to sodium metasilicate and be CeO 2 1% by weight of the surfactant sodium dodecylbenzenesulfonate was ground and mixed for 0.5 hours for surface modification, the modified powder was washed several times with deionized water and dried at 100°C to dry powder, then 500°C Calcined for 1 hour to obtain non-oxidizing CeO 2 Nanoparticles.

[0041] figure 2 For the obtained CeO 2 X-ray diffraction pattern of nanoparticles, surface modified CeO visible 2 The X-ray diffraction pattern of nanoparticles, it can be judged that the diffraction peaks in the spectrum are all CeO 2 The characteristic diffraction peaks, no impurity exists, and its particle size can be judged to be in the nanometer range from it...

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Abstract

The invention discloses an industrial method for preparing monodisperse CeO2 nanoparticles by using a novel low-temperature sol-gel route and eliminating the oxidability of the CeO2 nanoparticles by surface modification. Characterization results show that the prepared product is monodisperse CeO2 nanoparticles and that the CeO2 nanoparticles subjected to surface modification have no oxidability for organic materials, high absorbability and various ultraviolet absorption applications and particularly can be used as an ultraviolet absorption additive for sunscreen cream and cosmetics. The method adopts cheap raw materials, a simple process and mild reaction conditions, reduces waste discharge and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the fields of nanomaterial preparation, nanoparticle surface modification and sol-gel technology application, specifically the preparation of CeO by a new low-temperature sol-gel route 2 Nanoparticles and CeO 2 An industrial preparation method for surface modification of nanoparticles to eliminate their oxidative properties. Background technique [0002] Ultraviolet rays in sunlight cause damage to the human body and organic materials by breaking chemical bonds through rapid photolysis and photooxidation reactions. The most harmful rays in sunlight are medium-wave ultraviolet UVB (280-320nm) and long-wave ultraviolet UVA (320-400nm), which can weather, fade, and yellow organic materials such as polymers, plastics, dyes, pigments, wood, and paper. bleaching, darkening and loss of mechanical strength; their damage to human skin is cumulative and irreversible, leading to skin cancer, especially at high latitudes and high altitud...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 崔洪涛
Owner YANTAI UNIV
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