Preparation Of Nanometer Manganese Dioxide Composites And Their Catalytic Degradation Behavior Of Formaldehyde

In recent years,Volatile Organic Compounds(Referred to as VOCs) causes serious air pollution. It has become a global problem with more and more widely attention. VOCs means the organic compounds which boiling point is between 50 ℃ to 260 ℃ under ordinary conditions of pressure. When VOCs entered in human’s liver and kidney, it will be harm to our bodies. VOCs are toxic to human’s nerve system, even carcinogenic. It is seriously influence to the health of human’s body. It can also cause theenvironment pollution.Among the VOCs gases,formaldehyde is one of the most harmful common gases which are contact with human’s life. As a catalytic to removalformaldehyde, manganese dioxide is used for its metal catalystproperties.Its advantage is that the metal catalytic performance is strong, low cost, simple preparation method, no secondary pollution during the process of catalytic, etc.Manganese dioxide is a kind of good catalyst for catalytic formaldehyde.This study summarized thepollution of VOCs, the harm of formaldehyde and its control methods’ research progress.This study reviews the removal methods of formaldehyde in common use and the method of preparation of manganese dioxide. Potassium permanganate with manganous sulfate preparation of nanometer manganese dioxide is used as raw materials.Coprecipitation method is the method of preparation of materials.We properly controlling reaction conditions for the preparation of nanometer manganese dioxide of different kinds of crystal type.We characterized by XRD, SEM, etc.These samples were tested catalytic efficiency. We eventually found that the catalytic efficiency comparison of these three different crystal type and a regular nanoscale manganese dioxide. The result is that the delta crystal type > alpha crystal type>ordinary sample>gamma crystal type.This study of nanometer manganese dioxide catalyst is improved of technology.Considering of the specific surface area, we used the electrostatic spinning technology. the electrostatic spinning technology is adopted to the voltage of 12 kv, flow rate of 0.025 ml/min, receiving distance of 20 cm process parameters under the condition of the preparation of nano electrostatic spinning fiber membrane of manganese dioxide.In order to make the manganese dioxide catalystfullyexposed to the surface of the materials instead of being fiber packaged, we made the fiber to be porousand made of the catalyst and the target objects in material sufficient contact in order to Increase the active site.Eventually solute quality mark was 7%,Solute in polyvinyl butyral(PVB) and polyvinylpyrrolidone(PVP) content of 1:1.Finally, we considerof the basis of catalytic composite materials to increase the adsorption effect. The nanometer manganese dioxide and carbon fiber are composited in this experiment to make the composite materials to be a multifunctional materials.We carried on the characterization of XRD and SEM and tested its catalytic efficiency test. Eventually show that Load of nanometer manganese dioxide carbon fiber than carbon fiber catalytic efficiency increased by 18.1%.