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A method for preparing polyhedral iron oxyhydroxide film by corrosion recrystallization method

An iron oxyhydroxide and polyhedron technology, applied in the field of inorganic nanomaterials, can solve the problems of demanding experimental details, poor stability, complex preparation process, etc., and achieve the effects of easy large-scale preparation, mild reaction conditions, and simple and easy-to-obtain methods.

Active Publication Date: 2022-03-18
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 1. Mostly, the preparation of powder samples of iron oxyhydroxide requires subsequent purification and separation, and the process is complicated. There are few methods for preparing the film form of iron oxyhydroxide;
[0007] 2. The preparation method reported now is complicated, requires multi-step adjustment of pH value, has strict requirements for experimental details, and requires different morphology regulators to realize nanostructures;
[0008] 3. The thin film sample prepared by powder material is not easy to be evenly distributed on the substrate material, and the substrate is easy to fall off and unstable
[0009] Generally speaking, in the prior art, the preparation of iron oxyhydroxide nanomaterials still has disadvantages such as complex preparation process, long time-consuming, low output, poor stability, etc., which hinder its application in various fields.

Method used

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  • A method for preparing polyhedral iron oxyhydroxide film by corrosion recrystallization method
  • A method for preparing polyhedral iron oxyhydroxide film by corrosion recrystallization method
  • A method for preparing polyhedral iron oxyhydroxide film by corrosion recrystallization method

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Effect test

Embodiment 1

[0055] Embodiment 1: Preparation of octahedral iron oxyhydroxide film

[0056] (1) Preparation of iron oxyhydroxide nanowire film precursor 2: 0.1g FeCl 3 ·6H 2 O and 0.4g NaNO 3 Add it to 9mL of 1.09mol / L dilute hydrochloric acid in turn, wait until it is completely dissolved, stir until uniform, then add 1mL of ethanol, stir for about 1-5min, and finally add 0.2mL of 0.05M H 2 PtCl 6 After the aqueous solution was stirred for 3 minutes, the reaction solution was transferred to the lining of a 20mL reaction kettle, and the cleaned FTO stood obliquely in the lining of the reaction kettle, with the conductive side of the FTO facing down. After reacting for 2 hours, the reactor was taken out from the oven, and after cooling to room temperature, the yellow sample was taken out, which was the iron oxyhydroxide nanowire film precursor 2 . figure 1 It is the SEM figure of the iron oxyhydroxide nanowire film precursor 2 prepared in embodiment 1, from figure 1 It can be seen that...

Embodiment 2

[0059] A kind of preparation of octahedral iron oxyhydroxide thin film, comprises the following steps:

[0060] (1) Preparation of iron oxyhydroxide nanowire film precursor 2: 0.27g FeCl 3 ·6H 2 O and 0.85g NaNO 3 Add it to 5mL of 1.09mol / L dilute hydrochloric acid in turn, wait until it is completely dissolved, stir until uniform, then add 5mL of ethanol, stir for about 1-5min, and finally add 0.35mL of 0.65M H 2 PtCl 6 After stirring for 3 minutes, transfer the reaction solution to a 20mL liner, in which the cleaned FTO stands obliquely, with the conductive side facing down, and finally transfers it to an oven, and reacts at 100°C for 4 hours to obtain a yellow color The sample shows that iron oxyhydroxide is successfully prepared from the color judgment;

[0061] (2) Place the thin film precursor 2 prepared in step (1) upright in a clean polytetrafluoroethylene liner (20mL), with the side where the thin film precursor 2 grows facing down; reconfigure the solution and we...

Embodiment 3

[0063] A kind of preparation of octahedral iron oxyhydroxide thin film, comprises the following steps:

[0064] (1) Preparation of iron oxyhydroxide nanowire film precursor 2: 0.4g FeCl 3 ·6H 2 O and 0.90 g NaNO 3 Add it to 1mL of 1.09mol / L dilute hydrochloric acid in turn, wait until it is completely dissolved, stir until uniform, then add 9mL of ethanol, stir for about 1-5min, and finally add 0.5mL of 0.1M H 2 PtCl 6 After stirring for 3 minutes, transfer the reaction solution to the lining of a 20mL reactor, in which the cleaned FTO is placed obliquely, with the conductive side facing down, and finally transfer the reactor to an oven, and react at 100°C for 6 hours, that is A yellow sample can be obtained, judging from the color that iron oxyhydroxide is successfully prepared;

[0065] (2) Place the precursor film 2 prepared in step (1) upright in a clean polytetrafluoroethylene liner (20mL), with the side where the precursor film 2 grows facing down; then prepare the s...

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Abstract

The invention belongs to the field of inorganic nanometer materials, and discloses a method for preparing a polyhedral iron oxyhydroxide film by a corrosion recrystallization method. This method uses the principle of corrosion recrystallization, adopts the "top-down" reaction mode, and by adjusting the characteristics of the precursor sample and the reaction parameters, it successfully obtains the crystallite with regular shape, uniform size, strong bonding with the substrate, and different crystal planes. Cubic, octahedral, and polyhedral β-FeOOH nanocrystalline films with exposed properties. This method has the advantages of "bottom-up" method with high product purity and no need for separation and purification; at the same time, it inherits the advanced nature of "solution precipitation method" that can prepare catalysts with different shapes by adjusting reaction parameters in the same reaction system. It can be used as a preparation method of a wide range of nanomaterials and provide guidance for the preparation of other nanomaterials.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, in particular to a method for preparing a polyhedral iron oxyhydroxide film by corrosion recrystallization. Background technique [0002] Iron is an earth-abundant element, and iron oxides mainly include iron hydroxides and oxides. Among them, iron oxyhydroxide (FeOOH) widely exists in environmental media such as soil and water body sediments, and it has a wide range of uses in the field of catalysis, magnetic materials, sensors, pigments and environmental pollution control, and can also be used as a base for preparing iron oxide. precursor material. FeOOH exists in a variety of crystal forms in the natural environment, mainly including goethite (α-FeOOH), tetragonal lepidocite (β-FeOOH), lepidophyrite (γ-FeOOH) and hexagonal lepidocite (δ-FeOOH). ). Among them, β-FeOOH has the characteristics of unique micropore structure, strong ability to interact with guest molecules / atoms, exc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C17/34
Inventor 秦冬冬牛利段世芳韩冬雪陶春兰耿园园韦秋钰
Owner GUANGZHOU UNIVERSITY
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