摘要
研究了粉煤灰、粘土、膨润土等从溶液中去除有毒金属铅离子的吸附过程．动态试验显示，粉煤灰、膨润土对铅离子的吸附达到平衡状态的时间为24～72h，粘土为144h．吸附试验结果表明，粉煤灰、膨润土对铅离子的吸附能力远大于粘土、粉质粘土，且粉煤灰和膨润土相当，平衡吸附模型充分说明在高质量浓度下，铅离子在粘土、粉质粘土、粉煤灰、膨润土上的吸附最符合Langmuir等温线．试验结果还表明，随着吸附剂中铅离子质量浓度的增加，粉煤灰等吸附剂对铅离子吸附的百分率均呈减小的趋势。
An investigation is made on sorption of Pb（ Ⅱ ） from aqueous solutions by fly ash, clay, silty clay and bentonite. The results of dynamic sorption experiments show that the time of attaining equilibrium of sorption of Pb（ Ⅱ ） by fly ash and bentonite is 24- 72 h, while that by clay is 144 h. The sorption data show that sorption capacity of Pb（ Ⅱ ） on fly-ash and bentonite is much larger than that on day and silty clay, and sorption capacity of Pb（ Ⅱ ） on fly ash is equal to that on bentonite. Equilibrium modeling of the sorption show that at high concentration, the sorption of Pb （ Ⅱ ） on fly ash, day, silty clay and bentonite are best fitted to a Langmuir isotherm. The results also show that when Pb（ Ⅱ ） loading in adsorbents increase, the percentage of Pb （ Ⅱ ） sorption by adsorbents such as fly ash decrease.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第9期1226-1230,共5页
Journal of Tongji University:Natural Science
基金
上海市科技发展基金资助项目(022312202)
