沸石吸附去除污水中磷的研究

ADSORPTION OF PHOSPHROUS FROM WASTEWATER ONTO ZEOLITE

研究了沸石对水溶液中磷素的等温吸附特征,考察了初始溶液浓度、沸石粒径和温度三种因素对吸附作用的影响,分析了不同条件下沸石磷素吸附动力学过程。结果表明:Langmuir方程能很好地描述沸石对磷素的等温吸附特征,其磷素最大饱和吸附量为101mg/kg。初始溶液浓度越高,沸石对磷素的吸附量越大,吸附平衡时间越长。随着沸石粒径的减小,对磷素的吸附量增大,吸附平衡时间缩短。升高温度,沸石对磷素的吸附量增大,吸附平衡时间增长。沸石对水溶液中磷素的吸附动力学过程符合准二级动力学模型,由该模型可以估算出沸石磷素平衡吸附量,误差小于5%。

The isotherm adsorption of phosphorus on zeolite was studies. The effect of temperature, adsorbent particle size and initial phosphorus concentration on the phosphorus adsorption by zeolite was investigated. The results showed that Langmuir equation could well describe the isotherm adsorption feature of zeolite; the maximum saturated adsorption capacity of phosphorus was 101mg/kg; the higher the initial solution concentration, the greater the adsorption capacity of zeolite to phosphorus ,the longer the equilibrium time of adsorption; as the granular size of zeolite decreased, its adsorption capacity to phosphorus increased; the equilibrium time of adsorption shortened; as temperature rose, the adsorption capacity of zeolite to phosphorus increased, and equilibrium time of adsorption lengthened. The adsorption kinetic process of zeolite to phosphorus in aqueous solution conformed the quasi second order kinetic model .The equilibrium adsorption amount of phosphorus on zeolite could be estimated with error being less than 5% from the model.