Method for preparing nano zinc oxide by liquid cathode glow discharge plasma

The invention provides a method for preparing nano zinc oxide by liquid cathode glow discharge plasma. A platinum needle tip is adopted as an anode and liquid overflowing from the top end of a capillary tube is adopted as a cathode. The method includes conveying electrolyte containing zinc nitrate to the top of the capillary tube under the driving of a peristaltic pump and connecting a graphite tube with a negative electrode of a power supply. When enough high voltage is applied between the two electrodes, the electrolyte is excited by high-energy electrons to generate instant high temperatureand local high voltage along with the phenomena of light emitting, heating and the like, meanwhile, plasma is generated, generated turbid liquid flows into a collector along a graphite pipe groove; and centrifugal separation, distilled water washing, vacuum drying to constant weight and grinding are conducted to obtain milk white nano ZnO particles. The preparation method disclosed by the invention has the advantages of