Method for preparing gold nano particle modification zinc oxide

The invention relates to a method for preparing gold nano particle modification zinc oxide for processing sewage in environmental protection. The method comprises the following steps: (a) stirring a zinc salt solution and a sextic methyl tetramine solution evenly, wherein the proportion of the quantity of the zinc salt solution and the sextic methyl tetramine solution substance is 1:1-4; (b) adding a gold salt solution into mixed liquid A of the zinc salt solution and the sextic methyl tetramine solution and stirring evenly, wherein the proportion of the quantity of the gold salt solution andthe zinc salt solution substance is 1:100-1000; (c) transferring mixed liquid B of the zinc salt solution, the sextic methyl tetramine solution and the gold salt solution into a reaction kettle with the reaction temperature of 80-180 DEG C and reacting for 2-24 hours; and (d) after cooling to the normal temperature naturally, separating the mixed liquid B after reacting, washing and drying. The invention has simple preparation method, and adopts no strong acid, strong alkali and organic solvents; and compared with other preparation methods, the invention has the advantages of no environmentalpollution, no calcination and the like.