| abstract |
A cellulosic cationic ion-exchange composition is formed by sulfonation of activated cellulose having of high surface area characteristics, using an acid such as concentrated H 2 SO 4 . The sulfonated material is convertible into different forms, viz., H-form, Na-form, K-form, NH 4 + form, Ba-form, Ca-form, and Cu-form by appropriate reaction. The cation-exchanger has been found useful to treat industrial effluents for the removal of heavy metals, to achieve recovery of precious metals, to carry out water-softening, and the like. |