Preparation method and application for a resin-based iron oxide-containing composite phosphate removal adsorbent

A preparation method of a resin-based iron oxide-containing composite phosphate removal adsorbent, comprising:

• step (i) adding an alkaline anion resin into a prepared alkaline potassium ferrate solution, and stirring for 1-5 hours at room temperature to make ferrate ions exchange with anions of the alkaline anion resin;
• step (ii) discarding a supernatant in the solution obtained in step (i), adding water, heating to 50° C.-70° C. and stirring again for 1-3 hours to make the ferrate ions exchanged onto the alkaline anion resin hydrolyze into a ferric hydroxide;
• step (iii) adding a 2-10% by mass sodium chloride solution to the solution obtained in step (ii) to transform a hydroxyl group bonded onto the alkaline anion resin into Cl− to thereby obtain a composite resin loaded with nano-sized hydrated iron oxides;
• and
• step (iv) washing the composite resin loaded with nano-sized hydrated iron oxides to be neutral and then drying to obtain the resin-based iron oxide-containing composite phosphate removal adsorbent;
• wherein the potassium ferrate solution of step (i) has a concentration of 0.03-0.2 mol/L, and a pH of 9-12;
• wherein the concentration of the added alkaline anion resin is 20-200 g/L.