**5. Synthesis of polymeric material**

A solution of 2 g of acrylamide containing 0.5 M of sodium hydroxide (NaOH) was prepared and (2 w%) of maghnite-Na<sup>+</sup> (Algerian MMT) was then added. The mixture of (Am, maghnite-Na+ and NaOH) was put into a flask with 100 mL and stirred to allow proper mixing. The mixture was subjected to several short burst of microwave irradiation using a microwave oven at frequency of 2.45 GHz at power output of 200 W. The reaction mixture was then submitted to microwave irradiation at 160°C and for 4 min. The mixture was cooled (4–10 min at room temperature), filtered and washed extensively with distilled water and methanol to remove any unreacted acrylamide until the washing solution became neutral and air dried. The reaction taking place is shown in **Scheme 2**.

**Scheme 2.** Synthesis of anionic polyacrylamide (APAm) induced by maghnite-Na<sup>+</sup> (2 wt%) under microwave irradiation.
