powder process the anthracite powder with molten sodium hydroxide which could remove sulfur and silicon impurities and radicals in it then wash it till the ph value reaching 7 4 and dry it then we can obtain ultra clean anthracite powder take 1 g of anthracite powder put it through ultrasonic dispersion into 10 ml of concentrated sulfuric acid then add 4 g nitrate of potash into the mixture and process it with ultrasonic treatment for 0 5 hours add water to dilute the mixture and then suction filtrate it to remove the solvent put the mixture into heating process under microwave condition of 900w for 5 min and after air drying grinding and sieving we can obtain ultra clean anthracite powder for simplicity it is referred to as anthracite powder in next section of this embodiment with pre treatment take some anthracite powder and disperse it into 10 ml concentrated sulfuric acid and process the mixture with ultrasonic treatment of 20 u00b0 c for 0 5 hours then gently add potassium permanganate and potassium persulfate the mass ratio of which to anthracite powder is 1 4 and 1 2 respectively in the term of 1 g per minute into the mixture system then add 0 1 g of molybdenum trioxide into the mixture and treat it with ultrasonic process with temperature being 40 u00b0 c for 1 hour after the.