柚皮活性炭对氨氮吸附性能研究

Research on the adsorptive removal of NH_3-N from wastewater by the activated carbon prepared from grapefruit peel

采用氯化锌活化法制备柚皮活性炭,探讨其对废水中氨氮的吸附性能。结果表明,在pH为2～12,温度为30～50℃条件下,柚皮活性炭对氨氮均能取得较好的吸附效果;相同氨氮初始浓度条件下,随着投加量增加,单位质量柚皮活性炭对氨氮的吸附量明显减少;初始氨氮浓度越大,氨氮吸附量也越大。吸附数值遵循Henry及Freundlich等温吸附模型,吸附过程符合准二级动力学方程。

The activated carbon adsorbent has been prepared from grapefruit peel by activation with zinc chloride. The adsorbing effect of activated carbon on ammonia nitrogen is discussed. When the pH is from 2-12 and temperature from 30-50 °C, better adsorbing effectiveness of grapefruit-peel activated carbon on ammonia nitrogen can be obtained. Under the same initial concentration conditions, and with the increase of the dosage, the adsorbing effect on ammonia nitrogen is greatly decreased. The higher the initial concentration is ,the higher the adsorbing capacity on ammonia nitrogen is. The adsorbing data comply with Henry and Freundlich isotherm adsorption models etc., and the adsorbing process.