| 摘要 |
A filter medium for removing undesired materials from liquids is made by contacting an ion exchange material with a solution of dissolved manganese ions. The filter medium may comprise a particulate material such as sulphonated cross-linked polystyrene particles, coated with manganese dioxide. The filter medium may be prepared by batch or continuous processing during which the ion exchange material is allowed to contact a solution of potassium permanganate thus causing a layer of manganese dioxide to deposit on the surface of the ion exchange material. Preferably the filter medium is used to remove substances such as iron, manganese, radioactive species or arsenic from water in an industrial or domestic environment. |
