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利用Na OH对香蕉皮进行改性,制备改性吸附剂,研究吸附时间、温度、p H等3个因素对其氨氮吸附性能的影响。实验结果表明,Na OH改性提高了该吸附剂对氨氮的吸附能力,在较广温度范围内,该改性吸附剂保持着较高的吸附效率,在吸附氨氮过程中氨氮去除率随着p H值增大呈上升趋势,水质呈中性和碱性时,改性吸附剂表现出较高的吸附效率。相同氨氮初始浓度条件下,在吸附剂投加量增加,氨氮去除率升高,在氨氮浓度为6 mg/L时,可达到96.78%。在20℃温度条件下,饱和吸附量理论值达到9.478 7 mg/g。改性香蕉皮吸附剂对氨氮的吸附符合伪二阶吸附动力模型,氨氮饱和吸附数据符合Langmuir和Freundlich等温吸附模型。
Na-OH was used to modify the banana peel to prepare a modified adsorbent. The effects of adsorption time, temperature and p H on the adsorption properties of ammonia nitrogen were studied. The experimental results show that the modification of NaOH improves the adsorption capacity of NH3-N for the adsorbent. The adsorption efficiency of the modified adsorbent maintains high adsorption efficiency over a wide range of temperature. The NH3-N removal rate increases with the increase of p H value increased upward trend, the water quality was neutral and alkaline, the modified adsorbent showed high adsorption efficiency. Under the same initial concentration of ammonia nitrogen, when the amount of adsorbent increases, the ammonia nitrogen removal rate increases, reaching 96.78% when ammonia concentration is 6 mg / L. Under the temperature of 20 ℃, the theoretical value of saturated adsorption reached 9.478 7 mg / g. The modified banana peel adsorbent adsorbed ammonia nitrogen in accordance with pseudo-second-order kinetic model, and the data of ammonia-nitrogen saturation accorded with the Langmuir and Freundlich isotherm models.