膨润土对富营养化水体中磷的吸附特征

在不同膨润土投加量、不同振荡时间、不同溶液磷浓度和不同溶液pH值条件下,探讨了天然膨润土和柱撑膨润土对富营养化水体中磷的吸附效果,讨论了影响其吸附的主要因素,同时,观察了天然膨润土和柱撑膨润土的X射线衍射特征,比较了2者对磷的吸附差异性。结果表明:膨润土对溶液中磷的吸附是个迅速的过程,在10 min内基本可达最大值;随着投加量的增大,膨润土对溶液中磷的吸附量表现为先增大后逐渐稳定的趋势;溶液中磷浓度对膨润土的吸附能力有很大影响;溶液pH值在4左右时,天然膨润土对磷的吸附最强;溶液pH值在4～10时,柱撑膨润土对磷的吸附效果均较好;柱撑膨润土对溶液中磷的吸附能力显著优于天然膨润土。

Adsorption Characteristics of Bentonite to Phosphorus in the Eutrophic Water

In this paper,the adsorption effect of crude bentonite and pillared bentonite to phosphorus in the eutrophic water was studied in different conditions such as the amounts of bentonite,shaking time,the concentration of phosphorus,the granularity of mineral and the pH of solution.The properties of crude bentonite and pillared bentonite were determined with XRD.And the abilities in treating phosphorus of crude bentonite and pillared bentonite had been compared in this study.The results showed that the adsorption of bentonite surface to phosphorus was a rapid process,the maximal quantity of adsorption appeared in ten minutes.The adsorption effect to phosphorus was increased with the increase of the amounts of bentonite.The adsorption effect was affected by the concentration of phosphorus.When the pH value of solution was from 4 to 10,the adsorption effect of pillared bentonite to phosphorus was well.In this study,the adsorption effect of pillared bentonite to phosphorus was better than crude bentonite.