Preparation method of beta-FeOOH nano-capsules

A nanocapsule and nanorod technology is applied in the field of preparation of β-FeOOH nanocapsules, which can solve the problems of complex process and high preparation cost of iron oxide nanocapsules, and achieve the effects of excellent visible light absorption performance, simple operation and simple experimental operation.

Active Publication Date: 2018-11-30
HEFEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process for preparing iron oxide nanocapsules

Method used

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  • Preparation method of beta-FeOOH nano-capsules
  • Preparation method of beta-FeOOH nano-capsules
  • Preparation method of beta-FeOOH nano-capsules

Examples

Experimental program
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Embodiment 1

[0016] Example 1: Preparation and characterization of spindle-shaped β-FeOOH nanorods

[0017] Weigh 0.5g of FeCl 3 .6H 2 O was dissolved in 100 mL of deionized water to prepare an aqueous solution of ferric chloride, which was slowly heated to 95 °C, and β-FeOOH nanorods were obtained after a hydrolysis reaction for 72 h.

[0018] Using SEM and TEM to study the morphology and structure of the product respectively, it can be seen that the product morphology obtained is spindle-shaped (see figure 1 a and figure 1 c), combined with product XRD analysis, it can be known (see figure 1 b), the product is β-FeOOH (XRD standard spectrum: PDF#34-1266), and the visible-ultraviolet absorption maximum wavelength of the product is about 362nm (see image 3 dotted line).

[0019] The formation of β-FeOOH can be regarded as going through the following two processes: first, Fe 3+ Hydrolysis occurs to produce metastable Fe(OH) 3 colloid; then, Fe(OH) 3 Dehydration forms β-FeOOH, and t...

Embodiment 2

[0023] Embodiment 2: Preparation and characterization of β-FeOOH nanocapsules

[0024] Transfer 1 g of β-FeOOH nanorods into a reaction kettle, add 20 mL of glycerol and 2 mL of water, heat up to 180° C. and react for 12 hours to obtain β-FeOOH nanocapsules.

[0025] First of all, the morphology and structure of the obtained product were analyzed by SEM and TEM respectively. It can be seen that the shape of β-FeOOH nanorods remained basically unchanged after alcohol heat treatment, and was still in the shape of a spindle (see figure 2 a), while TEM observations show that the solid β-FeOOH nanorods have transformed into hollow nanocapsules (see figure 2 c). XRD analysis result confirms further (see figure 2 b), When β-FeOOH nanorods transform into β-FeOOH nanocapsules, an allotropic transformation occurs. Compared figure 1 d and figure 2 c shows that after the β-FeOOH nanorods (10.53×10.53×3.03) are transformed into β-FeOOH nanocapsules (10.48×10.48×3.023), the unit ce...

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Abstract

The invention discloses a preparation method of beta-FeOOH nano-capsules, and relates to the technical field of preparation of nano-capsules. The method comprises the following steps: performing hydrolysis by using an aqueous solution of ferric chloride to generate beta-FeOOH nano-rods, and carrying out heating alcohol thermalmaturation on the beta-FeOOH nano-rods, glycerin and water to prepare the beta-FeOOH nano-capsules. The beta-FeOOH nano-capsules are successfully obtained by adopting an alcohol thermalmaturation technology with green and environmentally-friendly glycerin as a reaction medium and the beta-FeOOH nano-rods as a precursor. The method has the characteristics of simplicity in operation, low cost, and excellent visible light absorption performance of the product, and provides a simple and environmentally-friendly method for preparing capsule type nanoparticles.

Description

technical field [0001] The invention relates to the technical field of nanocapsule preparation, in particular to a preparation method of β-FeOOH nanocapsules. Background technique [0002] Iron oxyhydroxide (FeOOH) usually exists in places such as riverbeds and mines. It is an important multilayer structure compound in nature and can be used as catalysts, pigments, adsorbents and magnetic materials. FeOOH commonly has four isomers of α-, β-, γ- and δ-FeOOH. Studies have shown that when the conditions are met, these kinds of iron oxyhydroxides can be transformed into each other. At present, there are many studies on the preparation and application of these four types of FeOOH nanomaterials in various forms. But there is no report on the preparation and application of FeOOH nanocapsules. [0003] A capsule generally refers to a unit body with a cavity structure. Nanoparticles can also be called nanocapsules if they have a cavity structure. For example, using β-FeOOH nanor...

Claims

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Application Information

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IPC IPC(8): C01G49/02B82Y40/00
CPCB82Y40/00C01G49/02C01P2002/84C01P2004/03C01P2004/04C01P2004/30
Inventor 韩成良曹显志刘自然杨昌林姚李
Owner HEFEI UNIV
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