粉煤灰、粘土、膨润土等对Zn2+的吸附试验研究

研究了粉煤灰、粘土、膨润土等从溶液中去除有毒金属离子Zn2 的吸附过程。动态试验显示吸附过程是快速的。吸附试验结果表明,粉煤灰、膨润土对Zn2 的吸附能力相当,但远大于粘土、粉质粘土。平衡吸附模型充分说明,在高浓度下Zn2 在粉煤灰、粘土、粉质粘土上的吸附符合Langmuir等温线。试验结果亦表明,随着吸附剂中Zn2 含量的增加,粉煤灰等吸附剂对Zn2 吸附的百分率均呈减小的趋势。

Study on sorption of Zn2+ by fly ash, clay and bentonite

Sorption of Zn2 from aqueous solutions by fly ash, clay and bentonite was investigated. The results of kinetic experiments showed that the sorption process of Zn2 was rapid. The sorption data showed that sorption capacity of Zn2 by fly ash and bentonite was much larger than those by clay and silty clay; and the sorption capacity of Zn2 by fly ash was equal to that by bentonite. Equilibrium modeling of sorption showed that at high concentration,the sorption of Zn2 by fly ash, clay and silty clay were fitted to a Langmuir isotherm. The results also showed that when Zn2 loading in adsorbents increased,the percentage of Zn2 sorption by adsorbents such as fly ash decreased.