改性海泡石对Pb^2+吸附性能及影响因素研究

Study on Adsorption Properties and Influencing Factors of Modified Sepiolite on Pb^2+

[目的]研究改性海泡石对Pb^2+吸附性能及影响因素。[方法]采用无机盐(FeSO4)、有机(巯基乙酸)和热处理,对海泡石进行改性,研究Pb^2+浓度、振荡时间、pH、海泡石用量对天然与改性海泡石的吸附性能影响。[结果]Pb^2+浓度、振荡时间、pH、海泡石使用量的变化均会引起天然与改性海泡石吸附量的变化;海泡石经过热、有机、无机盐改性后可很大程度上增加对Pb^2+的吸附;天然海泡石和改性海泡石对Pb^2+的等温吸附方程拟合较好的是Langmuir方程;改性海泡石在pH=6时吸附量最大,在一定范围内随着pH增大而吸附量增加。[结论]该研究为海泡石治理重金属污染提供依据。

[Objective]The research aimed to study the adsorption performance and influence factors of modified sepiolite on Pb^2+.[Method]The sepiolite was modified by salt(FeSO 4),organic(mercapto acetic acid)and heat treatment.The effects of Pb^2+ concentration,oscillation time,pH and sepiolite usage on the adsorption properties of natural and modified sepiolite were studied.[Result]The changes of Pb^2+ concentration,oscillation time,pH and the sepiolite usage will cause changes of adsorption capacity of natural and modified sepiolite.Sepiolite can greatly increase the adsorption of Pb^2+ after being modified by thermal,organic and inorganic salts.The isothermal adsorption equation of natural sepiolite and modified sepiolite for Pb^2+ was better fitted to the Langmuir equation.Modified sepiolite had the largest adsorption capacity at pH=6,and the adsorption capacity increased with increasing pH within a certain range.[Conclusion]The study provides a basis for the treatment of heavy metal pollution by sepiolite.