| 粉煤灰及膨润土对Ni^2＋，Zn^2＋，Cd^2＋，Pb^2＋的吸附研究 |
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| 引用本文： | 席永慧,赵红. 粉煤灰及膨润土对Ni^2＋，Zn^2＋，Cd^2＋，Pb^2＋的吸附研究[J]. 粉煤灰综合利用, 2004, 0(3): 3-7 |
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| 作者姓名： | 席永慧 赵红 |
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| 作者单位： | 1. 同济大学建筑工程系,上海,200092
2. 同济大学,混凝土材料研究国家重点试验室 |
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| 基金项目： | 上海市科技发展基金(编号:02231220) |
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| 摘 要： | 研究了粉煤灰和膨润土对溶液中有毒重金属离子Ni~(2 )、Zn~(2 )、Pb~(2 )、Cd~(2 )的吸附能力。动态吸附试验显示,吸附过程是快速的。试验结果表明:粉煤灰对Zn~(2 )的吸附能力和膨润土相当,对Ni~(2 )、Cd~(2 )的吸附能力均大于膨润土。平衡吸附模型说明在高浓度下,Ni~(2 )、Zn~(2 )、Pd~(2 )在粉煤灰中,Ni~(2 )、Pd~(2 )在膨润土中的吸附符合Langmuir模式。试验还表明:随着吸附剂中Ni~(2 )、Zn~(2 )、Pb~(2 )、Cd含量增加,粉煤灰和膨润土对Ni~(2 )、Zn~(2 )、Pb~(2 )、Cd~(2 )的吸附百分率下降。
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| 关 键 词： | 粉煤灰 膨润土 Ni~(2 ) Zn~(2 ) Cd~(2 ) Pb~(2 ) 吸附 等温线 |
| 文章编号： | 1005-8249(2004)03-0003-05 |
| 修稿时间： | 2004-02-23 |
Study on the Adsorption of Ni2+ 、Zn2+ 、Cd2+ 、Pb2+ by Fly Ash and Bentonite |
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| Affiliation: | (1. Department of Building Engineering,Tongji University,Shanghai 200092,China, 2. State Key-Laboratory of Concrete Materials Research,Tongfi University,Shanghai 200092,China) |
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| Abstract: | Adsorption of Ni~(2 ), Zn~(2 ), Cd~(2 ), Pb~(2 ) from aqueous solutions by fly ash and bentonite was investigated. The results of kinetic experiments showed that the adsorption process of Ni~(2 ), Zn~(2 ), Cd~(2 ), Pb~(2 ) on fly ash and bentonite was rapid. The adsorption data showed that the uptakes of Ni~(2 ), Cd~(2 ), Pb~(2 ) on fly ash was larger than those of bentonite, while the uptakes of Zn~(2 ) on fly ash was equal to that of bentonite. Equilibrium modeling of the adsorption showed that at high concentration, the adsorption of Ni~(2 ), Zn~(2 ), Pb~(2 ) on fly ash and the adsorption of Ni~(2 ), Cd~(2 ) on bentonite were fitted to a Langmuir isotherm. The results also showed that when Ni~(2 ), Zn~(2 ), Pb~(2 ), Cd~(2 ) loading in absorbents increased, the percentage of Ni~(2 ), Zn~(2 ), Cd~(2 ), Pb~(2 ) adsorption by fly ash and bentonite decreased. |
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| Keywords: | fly ash bentonite Ni~(2 ) Zn~(2 ) Cd~(2 ) Pb~(2 ) adsorption isotherm |
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