As a natural weak cationic flocculant, chitosan contains a large number of amino and hydroxyl groups in its molecule, which is active in nature and can be modified, activated and coupled. Therefore, chitosan and its derivatives have the characteristics of flocculant and adsorbent, and have a good adsorption effect on negatively charged organic and inorganic particles in water. Sodium alginate is a typical anionic polysaccharide. Its anionic activity mainly comes from the carboxyl group contained in the molecule.
Gold chitosan high-density chitosan indicates that both chitosan and sodium alginate have a certain flocculating effect. When acting alone, both chitosan and sodium alginate have a certain turbidity removal effect, but the decolorization effect is very small, and it can hardly be decolorized. However, the composite flocculant prepared by combining chitosan and sodium alginate has a good effect. When the composite ratio is 1 to 1, the flocculation effect is good, and there is obvious decolorization effect.