| 不同pH下有机酸对针铁矿和膨润土吸附Cd2+、Pb2+的影响 |
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| 引用本文： | 黄丽,刘畅,胡红青,刘凡,李学垣. 不同pH下有机酸对针铁矿和膨润土吸附Cd2+、Pb2+的影响[J]. 土壤学报, 2007, 44(4): 643-649 |
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| 作者姓名： | 黄丽 刘畅 胡红青 刘凡 李学垣 |
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| 作者单位： | 华中农业大学农业部亚热带农业资源与环境重点实验室,武汉,430070 |
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| 基金项目： | 国家自然科学基金;湖北省自然科学基金 |
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| 摘 要： | 用平衡吸附法研究了不同pH下,三种有机酸(乙酸、酒石酸和柠檬酸)对针铁矿和膨润土等温吸附Cd2 、Pb2 的影响。结果表明:在加入的Cd2 、Pb2 浓度分别小于0.2 mmol L-1和4.0 mmol L-1时,针铁矿和膨润土吸附平衡体系的pH随加入重金属浓度的增加而降低,膨润土体系的pH降低更明显。在有机酸作用下,pH对针铁矿和膨润土吸附Cd2 、Pb2 的影响差异显著。3酒石酸>乙酸,其对膨润土吸附的影响差异不明显。
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| 关 键 词： | 有机酸 针铁矿 膨润土 Cd2 ,Pb2 吸附 |
| 收稿时间： | 2006-01-23 |
| 修稿时间： | 2006-01-232006-06-26 |
EFFECTS OF ORGANIC ACIDS ON Cd2+ AND Pb2+ ADSORPTION ON GOETHITE AND BENTONITE AT DIFFERENT pH |
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| Huang Li,Liu Chang,Hu Hongqing,Liu Fan and Li Xueyuan. EFFECTS OF ORGANIC ACIDS ON Cd2+ AND Pb2+ ADSORPTION ON GOETHITE AND BENTONITE AT DIFFERENT pH[J]. Acta Pedologica Sinica, 2007, 44(4): 643-649 |
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| Authors: | Huang Li Liu Chang Hu Hongqing Liu Fan Li Xueyuan |
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| Affiliation: | Key Lab of Subtropical Agricultural Resource & Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China;Key Lab of Subtropical Agricultural Resource & Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China;Key Lab of Subtropical Agricultural Resource & Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China;Key Lab of Subtropical Agricultural Resource & Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China;Key Lab of Subtropical Agricultural Resource & Environment, Ministry of Agriculture, Huazhong Agricultural University, Wuhan 430070, China |
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| Abstract: | Effects of organic acids(acetic acid,tartaric acid and citric acid) on Cd2 and Pb2 adsorption on goethite and bentonite were studied with the batch method.Results show that pH decreased with the increase in concentration of Cd2 and Pb2 in the goethite and bentonite isothermal systems when the concentration of Cd2 and Pb2 was lower than 0.2 mmol L-1 and 4.0 mmol L-1,respectively.The decrease of pH in bentonite system was more obvious than in goethite system.The effect of pH on Cd2 and Pb2 adsorption of goethite and bentonite varied sharply with organic acids added.Cd2 sorption rate was small with goethite when pH was in the range from 3 to 4.5,but it went upward sharply when pH was higher(4.5tartaric acid>acetic acid,but the effect was not clear with bentonite. |
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| Keywords: | Ph |
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