天然沸石对雨水中氨氮的吸附性能

Characteristics of Rain Ammonium Adsorption by Natural Clinoptilolite

以粒径为1～1.5 mm和2～4 mm的细、粗两种天然斜发沸石为实验材料,进行氨氮吸附等温线实验和吸附动力学实验,探讨沸石对雨水中氨氮的吸附规律。结果表明,实验沸石对NH4+的吸附等温线符合Frundlich公式,且细沸石和粗沸石对氨氮吸附量的极限值分别为5.83 mg/g和18.375 mg/g;细沸石比粗沸石有更好的吸附效果;粗沸石对氨氮的吸附反应为一级反应,吸附速率常数为0.022 212 g.m-2.h-1。

Selecting two types of natural clinoptilolite with diameters of 1～1.5 mm and 2～4 mm separately as experimental material,we conduct NH+4-N adsorption isotherms experiment and adsorption kinetics experiment to explore the regularity of zeolite adsorption NH+4-N.The experimental results show that the process of NH+4-N adsorption by natural zeolite is fitted to Freundlich adsorption isotherm.The maximum of NH+4-N adsorption by thin and thick zeolite are 5.83 mg/g and 18.375 mg/g(zeolite),respectively,which prove that fine zeolite's adsorption of NH+4-N in rain is more effective than thick zeolite's.NH+4-N adsorption of thick natural clinoptilolite corresponds to the first-order kinetics equation.The constant of reaction rate is 0.214 23 h-1and the adsorption rate constant is 0.022 212 g·m-2·h-1.