A kind of preparation method and application of nano manganese dioxide

Abstract

The invention provides a preparation method of nano-manganese oxide which is of a nanowire net structure. The preparation method comprises the following steps: dropwise adding an oxidant containing aqueous solution or feeding oxidizing gas into an active agent containing manganese salt aqueous solution, and uniformly dispersing; carrying out a liquid-phase co-precipitation reaction, so that nano-sized manganese dioxide is suspended in the solution; filtering the solution; and washing and drying the obtained precipitate subjected to filtering, so that the nano-manganese oxide is obtained. The nano-manganese oxide prepared by using the preparation method disclosed by the invention can be applied to the field of super capacitors and wastewater treatment. According to the invention, through elaborate design, the industrial process is maximally simplified, the quality of products is improved, and the production cycle is shortened, therefore, the method disclosed by the invention is a nano-manganese oxide preparation method which is simple in technological process, small in energy consumption, short in reaction period, good and stable in product quality and low in cost.

Description

technical field [0001] The invention relates to the preparation of nanometer materials, in particular to a method for preparing nanometer manganese dioxide by a low-temperature liquid-phase co-precipitation method and its application. Background technique [0002] Manganese dioxide is an amphoteric transition metal oxide and is the main component of pyrolusite. It is a black or brown powdery solid that is very stable at room temperature. As an important transition metal oxide, manganese dioxide has been widely used in many fields such as battery materials (such as supercapacitors) due to its good redox characteristics. [0003] In addition, with the increasingly serious environmental pollution, experts and scholars from various countries are working hard to develop green new materials and find new methods of pollution control. Due to the unique chemical composition and physical and chemical properties of manganese dioxide, it has begun to be used as a pollution control tool...

AI Technical Summary

Problems solved by technology

In order to make better use of manganese dioxide, nano-manganese dioxide with special properties can be used. Nanoparticles have many unique properties, such as small size, large surface area, different bonding and electronic states on the surface from those inside the particle, and atomic coordination on the surface. The position is incomplete, leading to the increase of surface active sites. With the decrease of particle size, the smoothness of the surface becomes worse, forming uneven atomic steps, which increases the contact surface of chemical reactions. At present, the main production methods of nano manganese dioxide are: Mechanical crushing method, electrochemical precipitation method, sol-gel method, microemulsion method, template method, co-precipitation method, redox deposition method, chemical reduction deposition method, hydrothermal method, mechanochemical method, self-assembly method, physical steam Deposition method, high-temperature solid-state reaction method, these methods have high requirements on equipment, and the process is complicated, so it is urgent to find a method for preparing nano-manganese dioxide with low equipment requirements and simple and feasible process.

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