红黄土对水中Cr~(3+)和Cd~(2+)的吸附性能

用天然红黄土作为吸附剂进行了去除水中Cr3+和Cd2+的试验研究,考察了pH值、吸附时间、红黄土投加量对吸附效果的影响,测定了不同pH和不同温度下的吸附等温线。结果表明:红黄土对Cr3+的吸附能力高于对Cd2+的吸附能力,一定条件下,Cr3+的去除率可达99.5%,而Cd2+的去除率最高约63%;吸附行为均符合Lang-muir单分子层吸附模型。根据试验结果,认为红黄土有望成为处理含重金属离子废水的新型吸附材料。

Research on Adsorption Performance of Red Loess on Cr3+ and Cd2+

The experiments on the Cr³⁺ and Cd²⁺ removal from water with red loess as the sorbent are carried out，and the influence of pH，contract time，adsorbent dose and temperature on the adsorption of Cr³⁺ ，Cd²⁺ was studied.The isotherms at different pH and temperatures have been determined.The results indicate that the red loess has a better adsorption effect on Cr³⁺ than Cd^2+.Under a certain condition，the removal rate of Cr³⁺ can reach 99.5%，while that of Cd²⁺ maximize to be about 63%.Both adsorption behaviors are fitted to the Langmuir monolayer adsorption model.According the results，it is considered that red loess is expected to become a new-type adsorbing material for treating the waste water of containing heavy metal ions.