炭化柚子皮对水中氨氮吸附性能的研究

Study on the adsorption of ammonia nitrogen in water by carbonized pomelo peel

制备了炭化柚子皮,研究了其对水中氨氮的吸附性能。考察了p H值、接触时间、吸附剂投加量、模拟废水初始浓度等因素对氨氮吸附效果的影响。结果表明:在50 m L初始质量浓度为110 mg/L的模拟废水中,吸附温度控制在30℃,当炭化柚子皮的投加量为0.7 g、p H值为11、接触震荡时间为120min时,吸附剂对模拟废水中氨氮的吸附效果最佳,氨氮去除率达到95%。对吸附等温线数据采用Langmuir式和Freundlich式进行了拟合,结果表明:炭化柚子皮对氨氮的吸附特征均能被2种等温模型进行描述,Freundlich吸附等温模型中1/n为0.498,说明炭化柚子皮对氨氮吸附是可以进行的。

The carbonized pomelo peel is prepared and its performance of adsorbing ammonia nitrogen in water is studied. The inluences of pH value, contact time, dosage of adsorbent and initial concentration of simulation wastewater on the adsorption effects of ammonia nitrogen are investigated. The results show that for the 50 mL simulation wastewater with initial mass concentration of 110 mg/ L and adsorbing temperature of 30 ℃ , under the conditions of dosage of adsorbent 0. 7 g, pH value 11 and exposure time 120 min, the adsorption effect is optimum with ammonia nitrogen removal rate of 95%. The isotherm data are fitted by Langmuir and Freundlieh equation, and the results show that the adsorption characteristics of carbonized pomelo peel to ammonia nitrogen can conform to those two kinds of isothermal models, and the value of 1/n in the Freundlich adsorption isotherm model is 0. 498, which indicates the carbonized pomelo peel on the adsorption of ammonia nitrogen can be carried out.