Preparation method of melamine sponge modified adsorbent and application of melamine sponge modified adsorbent in cationic dye wastewater treatment

The invention relates to a preparation method of a melamine sponge modified adsorbent and application of the melamine sponge modified adsorbent in cationic dye wastewater treatment. The preparation method comprises the following steps: dissolving sodium carboxymethyl cellulose powder and sodium alginate powder in water according to a mass ratio of 1: 1 to form a transparent colloid (the colloid contains two substances with mass concentrations of 0.1-1g/100mL); a melamine sponge sheet with the size of 1-20 cm < 3 > is soaked in the colloid, and after the melamine sponge fully absorbs the colloid solution, air drying is conducted; transferring into a 1-10% AlCl3 solution, soaking for 24-48 hours, and air-drying to obtain the melamine sponge modified adsorbent. The adsorbent cation is used for ionic dye wastewater treatment, has excellent capacity of removing cationic dye in wastewater, is simple to prepare, low in cost and large in adsorption capacity, can be used for desorption and recovery of the dye, and has