Abstract: The new adsorbent of microwave enhanced Al-modified bentonite was produced by means of Al₂(SO₄)₃ and microwave radiation, and its adsorption properties on ammonia nitrogen in water was investigated. The experimental study showed that the optimum preparation conditions of adsorbent are 4% of Al₂(SO₄)₃ solution under the radiation for 10 min by 480W microwave. In this condition, the specific surface area of the microwave enhanced Al-modified bentonite can be up to 180.69 m²/g. By adopting this microwave enhanced Al-modified bentonite, the removal efficiency for 100 mg/L of ammonia-nitrogen wastewater will be up to 96.8% under conditions of the pH 10, the total adsorbent dosage of 0.4 g/L and the reaction time for about 20 min.

Key words: Al-modified bentonite, Microwave, Ammonia nitrogen, Adsorption