沸石的改性工艺及其吸附除磷特性研究

Modification process of zeolite and its phosphorus adsorption characteristics

研究了组合改性沸石的最佳制备方法,以及不同改性方式和pH对改性沸石除磷效果的影响。通过吸附动力学与吸附等温线探究其吸附机理并使用扫描电镜对改性前后的沸石进行表征。结果表明,最佳的改性方案为2.0 mol/L NaOH溶液和2.0 mol/L聚合氯化铝(PAC)溶液组合改性。当废水pH=7时该改性沸石除磷效果最佳,此时除磷率为98.74%,其吸附符合准二级动力学方程和Langmuir模型。扫描电镜表征结果表明,碱改性和铝改性均可改变沸石的孔隙结构,增加吸附点位。

The optimal preparation method of combined modified zeolite was studied,and the effect of different modi-fication methods and pH on the phosphorus removal effect were investigated.Adsorption mechanism through adsorp-tion kinetics and adsorption isotherms was explored and the structure of zeolite before and after modification were in-vestigated with scanning electron microscopy.The results showed that the optimal modification plan was the combined modification of 2.0 mol/L sodium hydroxide solution and 2.0 mol/L polyaluminum chloride solution.When the waste-water pH=7,the phosphorus removal effect was the best,and the phosphorus removal rate was 98.74%.Modified zeo-lite adsorption met quasi-second-order kinetics and Langmuir model.Scanning electron microscopy showed that both alkali modification and aluminum modification could change the pore structure of zeolite and increase adsorption sites.