氧化铈改性沸石脱氮的研究

用浸渍焙烧法制备稀土吸附剂,用于静态脱氮实验。结果表明,氧化铈改性的稀土吸附剂吸附性能优于氧化镧和氧化镧-氧化铈复合改性的稀土吸附剂;当吸附剂用量为2 g/L,进水pH为4~6,吸附时间为2.5 h,氧化铈改性稀土吸附剂对模拟废水氨氮浓度为20 mg/L的吸附率达到80.23%;吸附剂再生6次后氨氮的去除率下降不到7%,说明吸附剂具有较好的稳定性。

Study on ammonia nitrogen removal from wastewater by model-Ce zeolite adsorbent

The new-style Ce-modified zeolite adsorbent was prepared by modifying zeolite with cerium.The results showed that the adsorption capacity of Ce-modified for ammonia nitrogen was better than the La-modified and La-Ce compound modified zeolite.The adsorption rate of the ammonia nitrogen removal can reach 80.23% under the following conditions:the dosage of adsorbent is 2 g/L,the pH value of the solution is from 4 to 6 and the adsorption time is over 2.5 h,adsorption capacity of ammonia nitrogen decreases less than 7% after the absorbent regenerated 6 times,which meant a good stability of Ce-modified zeolite adsorbent.