The present invention relates to a cationic polymer comprising: - at least one maltodextrin; - at least one substituent comprising at least one ammonium group; and - at least one linker covalently bonded to the at least one maltodextrin, wherein the at least one linker is selected from the group consisting of: dicarboxylic acid, dianhydride, carbonyldiimidazole, diphenylcarbonate, triphosgene, acylic dichloride, diisocyanate, a diepoxide, and a triepoxide. The present invention relates also to the preparation process of said cationic polymer and to its use for the purification of water.
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