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采用超声及NaCl溶液对天然沸石进行改性,以增强其对水中氨氮的去除效果。结果表明,“超声+NaCl”改性方法可以极大地提高沸石对氨氮的去除能力。在初始氨氮浓度为10 mg/L、改性沸石投加量为2.5 g/L的条件下,10 min后改性沸石对氨氮的吸附即达到饱和,氨氮去除率可达到90.06%,相比天然沸石提高了81.6%;扫描电镜和比表面积测定显示改性后沸石形貌趋于规整,比表面积降低,而孔容和孔径大大增加。Langmuir单分子层吸附模型可以很好地描述改性沸石对氨氮的吸附行为,R~2为0.999 6。
The natural zeolite was modified by ultrasonic and NaCl solution to enhance the removal efficiency of ammonia nitrogen in water. The results show that “ultrasonic + NaCl ” modified method can greatly improve the ability of zeolite to remove ammonia nitrogen. Under the condition of the initial ammonia nitrogen concentration of 10 mg / L and the modified zeolite dosage of 2.5 g / L, the adsorption of ammonia nitrogen on the modified zeolite reached saturation after 10 min, and the ammonia nitrogen removal rate could reach 90.06% Zeolite increased by 81.6%. The SEM and surface area measurements showed that the morphology of the modified zeolite tends to be regular, the specific surface area decreases, and the pore volume and pore diameter increase greatly. Langmuir monolayer adsorption model can well describe the adsorption behavior of modified zeolite on ammonia nitrogen, R ~ 2 is 0.999 6.