大理石去除水溶液中Cd^(2+)的性能实验研究

Study on the Removal Ability of Cd^(2+) in Aqueous Solution by Marble

对大理石去除水溶液中的Cd2+进行了实验研究,结果表明,大理石对水溶液中的Cd2+具有良好的去除效果。主要研究的影响因素有:pH值,作用时间,Cd2+的初始浓度和大理石投加量。对于50 mg/L Cd2+溶液,pH=8的条件下,大理石的投加量为12.5 g/L,作用时间30 min,去除效率可达92%,吸附量为3.68 mg/g。大理石对水溶液中的Cd2+的吸附作用符合Langmiur等温吸附方程。

The removal of Cd^2＋ in aqueous solution is investigated by using marble in this paper. We find that marble can remove Cd^2＋ from aqueons solution effectively. The main influence parameters in this experiment are solution pH, contact time, initial cadmium concentration and marble addition. In the condition of pH = 8, marble addition = 12.5 g/L, contact time = 30 mins and Cd^2＋ initial concentration = 50 mg/L, the removal rate of cadmium is 92%, the cadmiumadsorption capacity is 3.68 mg/g. Typical adsorption isotherms are caloulated, and the Langmuir type is best.