Patent ID: 8222182

Claim:
A manufacturing method for an anion adsorbing carbonized plant material, comprising: providing a ligneous plant material with conductive tissue cut into sizes not greater than 50 mm; soaking and stirring the ligneous plant material in a liquid solution having 0.1 weight % to 7.0 weight % of a calcium chloride with individual diameter sizes not greater than 100 nm for a time period to introduce the calcium chloride into the conductive tissue of the ligneous plant material; removing the soaked ligneous plant material with the calcium chloride positioned within the conductive tissue; drying the soaked ligneous plant material; carbonizing the dried ligneous plant material with the calcium chloride in the conductive tissue at a temperature of 650° C. to 750° C. for a time period to enable carbonization of the dried ligneous plant material, with deposits of calcium chloride within 2 weight % to 25 weight % of the carbonized plant material; and applying a hydrochloric acid solution to the carbonized plant material to react with the calcium chloride, within a pressure range of 1330 Pa to 13.3 Pa, to remove extra crystals of CaCl 2 while leaving chloride ions in the carbonized plant material so that functional groups which have been drawn out from walls of micro pores in the carbonized plant material are combined with chloride ions to enable ion exchanging with nitrate nitrogen, nitrite nitrogen, and fluoride ions.