改性硅藻土对水体中Pb~(2+)的吸附性能研究

用氢氧化钠对吉林长白硅藻土进行改性,并研究了改性硅藻土对Pb2+吸附性能,讨论了硅藻土用量、pH、吸附时间等因素对吸附效果的影响。结果表明:硅藻土改性后对Pb2+的吸附性能明显提高,改性硅藻土对Pb2+的去除率可达70%;pH是影响吸附效果的最主要因素,pH=5～6时吸附效果最佳;温度对吸附效果影响不大;在Pb2+初始浓度为50mg/L时,硅藻土用量以5～6g/L为佳。

Study on Absorption Experiment of Pb2+ by Modified Diatomite

A modified diatomite was prepared by using sodium hydroxide and natural diatomite from Changbai Mountain Area in Jilin Province.The adsorption properties of the modified diatomite for heavy metal Pb（Ⅱ） was investigated in aqueous solution.The effect of the adsorbent dosage,pH,temperature and time on the adsorption capability was discussed.The results showed that the adsorption capability of the modified diatomite for Pb^2＋ increased evidently,and removal efficiency was 70 %.The pH value of the solution was most important effect,in the process a best comes out pH=5～6;Temperature had no significant effect on the adsorption;When the initial concentration of Pb^2＋ was 50 mg/L,the suitable dosage of diatomite sorbent should be 5～6 g/L.