方解石、海泡石对水中Cd^(2+)的吸附性能研究

Study on the adsorption ability of Cd^(2+) in aqueous solution by calcite and sepiolite

通过静态吸附试验,以方解石、海泡石为吸附剂,研究了Cd^(2+)初始浓度、吸附反应时间、温度、吸附剂添加剂量等不同影响因素对Cd^(2+)吸附性能的影响。结果表明:4个影响因素对方解石、海泡石吸附性能均有影响,其中Cd^(2+)初始浓度对方解石、海泡石吸附Cd^(2+)的性能影响更为显著;Cd^(2+)初始浓度为20mg·L-1时,方解石、海泡石对Cd^(2+)去除率分别高达99.95%、99.81%,但随着初始浓度的升高其去除率逐渐降低;方解石、海泡石对Cd^(2+)的吸附均符合Freundlich、Langmuir等温吸附,最大吸附量分别为6.920、3.656mg·g^(-1)。

The effects of the initial concentration of Cd^(2+),reaction time,temperature and the amount of adsorbent additives on the adsorption capacity of Cd^(2+)were studied by static adsorption experiments.The results show that the above 4 factors have an effect on the adsorption properties of calcite and sepiolite,and the effect of initial concentration of Cd^(2+)on the adsorption of Cd^(2+)by sepiolite and sepiolite was more significant:the initial concentration of Cd^(2+)was 20 mg·L-1,the removal rate of Cd^(2+)by calcite and sepiolite was as high as 99.95%,99.81%,but with the increasing of the initial concentration,the removal rate decreased gradually.The adsorption of calcite and sepiolite on Cd^(2+)was in accord with Freundlich and Langmuir adsorption isotherms,and the maximum adsorption capacity was 6.920 and 3.656 mg·g^(-1),respectively.