POROUS IRON OXIDE, PROCESS FOR PRODUCING THE SAME, AND METHOD OF TREATING WATER

摘要

A recovery agent for recovering arsenic, fluorine, lead, and selenium from a solution containing environmentally hazardous substances including arsenic and fluorine. A porous iron oxide having a particle diameter of 10-100μm and a specific surface area as determined by the three-point BET method of 50 m/g or larger is introduced into a solution containing the environmentally hazardous substances. Alternatively, a solution containing the environmentally hazardous substances is passed through a column packed with the porous iron oxide. Thus, the environmentally hazardous substances are recovered from the solution.