It was found that Pb2+ ions in the both solutions were easily removed to the apatite samples mainly by cation-exchange reactions between the Pb2+ ions in the solutions and Ca2+ ions of the samples at room temperature. Further, in the system of aqueous PbF2 solutions, anion-exchange reactions between F? ions in the solutions and OH ? ions of the samples occurred simultaneously and the liberated OH ? and Ca2+ ions influenced removal behavior of Pb2+ and F? ions. The maximum removal amount of Pb2+ ions from the aqueous solutions was 400?mg per g of S-1. Pb? ions in the waste water from lead plating factories were completely removed to the apatite samples. In this manner, it was found that the apatites, especially S-1 can be employed as a new removal agent for the treatment of poisonous Pb2+ ions in waste water. 相似文献