Method for preparing nano alpha-Fe2O3

Abstract

The invention provides a method for preparing nano alpha-Fe2O3, and belongs to the technical field of nano material preparation. The method comprises the following steps: mixing an iron source and anhydrous sodium carbonate, performing grinding, placing the ground material into a stainless steel reaction kettle, performing heating to 100-200 DEG C, performing crystallization for 36-72 h, after thecrystallization is finished, performing quick cooling, performing washing, and drying a filter cake to obtain the nano alpha-Fe2O3, wherein the iron source used in the method is an iron salt which iseasily soluble in water or solid waste with an iron content of 95% or more. The method provided by the invention utilizes a solventless method, has no secondary pollution in the preparation process,and is green and environmentally friendly; the solventless method is applied to a process for synthesizing the nano alpha-Fe2O3 by using the solid waste as a raw material for the first time; the method utilizes the solid waste containing iron as the raw material and the solventless method to synthesize the nano alpha-Fe2O3, and has the advantages of a simple process, a high added value of the product and a wide application range; and the technology not only can alleviate the resource and environmental problems brought by the solid waste, but also can prepare the product with the high added value, thereby having economic and ecological environmental benefits.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a method for preparing nano-α-Fe 2 o 3 Methods. Background technique [0002] With the rapid development of nanotechnology, nanomaterials have become of great significance to society, human life, production economy and scientific and technological progress. The special interface structure of nanomaterials makes them have physical and chemical properties that materials in the traditional sense do not have. It is widely used in medical, electronics, bioengineering and other fields. Nano α-Fe 2 o 3 It is an important narrow-bandgap n-type semiconductor material, which has the advantages of good stability, non-toxicity, cheapness and easy availability. When the size of iron oxide is in the range of 0.1-100nm, the proportion of the number of surface atoms to the total number of atoms increases sharply, which will show some special properties possessed by nanomate...

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Problems solved by technology

The precipitation method can well control and promote the hydrolysis of iron salts, but the requirements for the control of the hydrolysis temperature are relatively high. If the temperature is too high, the water evaporates too quickly, the system concentration is difficult to control, and the hydrolysis of iron salts will also be accelerated, which will lead to poor nucleation. Uniform, low temperature is not conducive to the hydrolysis reaction; the size of the nanoparticles prepared by the sol-gel method is uniform, the particle size is relatively small, but the process is complicated, a large amount of organic solvent is required, and the cost is high; -Fe 2 o 3 The commonly used method can control the reaction process very well and ensure the uniformity of nucleation. The products are all nanoparticles. Adding surfactants will synthesize nano-α-Fe with different shapes. 2 o 3 , used in a variety of high-end materials, but the hydrothermal method in the preparation of nano-α-Fe 2 o 3 The use of solvents cannot be completely avoided during the process, resulting in a large amount of alkali-containing wastewater and reducing the concentration of nano-α-Fe 2 o 3 Space utilization of synthesis equipment

The solvent-free method refers to the nano-α-Fe 2 o 3 No solvent is used in the preparation process. After simple mixing and grinding, it is directly placed in the reaction kettle and sealed at a certain temperature for synthesis. This process is simple and the equipment utilization rate is high. Nano-α-Fe 2 o 3 It was proposed for the first time in terms of preparation, and there is no report on the synthesis of molecular sieves using solid waste as raw materials by a solvent-free method

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