天然沸石对雨水中氨氮的吸附性能

摘要

Selecting two types of natural clinoptilolite with diameters of 1 -1.5 mm and 2 - 4 mm separately as experimental material, we conduct NH4+ -N adsorption isotherms experiment and adsorption kinetics experiment to explore the regularity of zeolite adsorption NH4+-N. The experimental results show that the process of NH4+-N adsorption by natural zeolite is fitted to Freundlich adsorption i-sotherm.The maximum of NH/-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/ -N in rain is more effective than thick zeolite's. NH4+ -N adsorption of thick natural clinoptilolite corresponds to the first-order kinetics equation. The constant of reaction rate is 0.214 23 h-1 and the adsorption rate constant is 0.022 212g·m-2 · h-1.%以粒径为1 -1.5 mm和2～4mm的细、粗两种天然料发沸石为实验材料,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NH+4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 212g·m-2·h-1.