Method for preparing polyhedral iron oxyhydroxide thin film through corrosion recrystallization method

Abstract

The invention belongs to the field of inorganic nano-materials, and discloses a method for preparing a polyhedral iron oxyhydroxide thin film through a corrosion recrystallization method. The method utilizes the principle of corrosion recrystallization and adopts a 'from-top-to-bottom' reaction mode, and by adjusting precursor sample characteristics and reaction parameters, cubic, octahedral and polyhedral beta-FeOOH nano-crystalline thin films with regular morphology, the uniform size, high binding force with substrates and different crystal face exposure characteristics are obtained successfully. The method has the advantages that through a 'from-bottom-to-top' method, the product purity is high, and separation and extraction are not needed, meanwhile inherits advancement that catalystswith different morphology can be prepared through a 'solution precipitation method' under the same reaction system by adjusting the reaction parameters, can serve as a wide nano-material preparation method, and provides guiding significance for preparation of other nano-materials.

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...

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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.

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