| 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,王茹,胡红青,李学垣.有机酸对针铁矿和膨润土吸附Cd2+、Pb2+的影响[J].土壤学报,2006,43(1):98-103. |
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| 作者姓名： | 黄丽 王茹 胡红青 李学垣 |
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| 作者单位： | 华中农业大学资源与环境学院,武汉,430070 |
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| 基金项目： | 中国科学院资助项目;华中农业大学校科研和教改项目 |
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| 摘 要： | 用平衡吸附法研究了不同浓度的有机酸（乙酸、酒石酸和柠檬酸）对针铁矿和膨润土吸附Cd^2＋、Pb^2＋的影响。结果表明：（1）低浓度（〈0．6mmolL^-1）有机酸促进供试矿物吸附Cd^2＋和Pb^2＋，随着有机酸浓度增加，吸附逐渐被抑制。高浓度（〉1．0mmolL^-1）有机酸对Pb^2＋吸附的抑制作用比对Cd^2＋的强。有机酸浓度的变化对针铁矿Cd^2＋、Pb^2＋吸附率的影响大于对膨润土的。（2）不同Cd^2＋浓度下，有机酸对膨润土Cd^2＋吸附强度的影响大于针铁矿。加入高浓度Cd^2＋（8．0mmolL^-1）时，低浓度有机酸对膨润土吸附Cd^2＋的促进作用比加入低浓度Cd^2＋（0．4mmolL^-1）时明显，高浓度有机酸对膨润土吸附Cd^2＋的抑制作用与低浓度Cd^2＋时相近。（3）低浓度有机酸（〈0．6mmolL^-1）时，酒石酸、柠檬酸对针铁矿吸附Cd^2＋的促进作用大于乙酸，而它们对膨润土吸附Cd^2＋的促进作用相似；在三种有机酸高浓度（〉1．0mmol L^-1）时，针铁矿对Cd^2＋的吸附都趋于稳定，而柠檬酸对膨润土吸附Cd^2＋的抑制作用比乙酸和酒石酸的明显。不同种类有机酸下，矿物对Pb^2＋吸附率大小的变化基本一致。
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| 关 键 词： | 有机酸 针铁矿 膨润土 吸附 |
| 收稿时间： | 11 26 2004 12:00AM |
| 修稿时间： | 2004-11-262005-06-12 |
EFFECTS OF ORGANIC ACIDS ON ADSORPTION OF Pb2+ AND Cd2+ BY GOETHITE AND BENTONITE |
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| Huang Li,Wang Ru,Hu Hongqing and Li Xueyuan.EFFECTS OF ORGANIC ACIDS ON ADSORPTION OF Pb2+ AND Cd2+ BY GOETHITE AND BENTONITE[J].Acta Pedologica Sinica,2006,43(1):98-103. |
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| Authors: | Huang Li Wang Ru Hu Hongqing and Li Xueyuan |
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| Institution: | College of Resource and Environment, Huazhong Agrieuhural University, Wuhan 430070, China |
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| Abstract: | Effects of organic acids(acetic acid,tartaric acid and citric acid) on adsorption of Cd~(2 )and Pb~(2 ) by goethite and bentonite were studied with the batch method.The results show that Cd~(2 )and Pb~(2 )adsorption by the tested minerals was(promoted) by organic acids low in concentration(<0.6 mmol L~(-1)),whereas the adsorption was inhibited with the concentration of the organic acids rising.The inhibiting effect of the organic acids on Pb~(2 )adsorption by goethite and bentonite were stronger(than) on Cd~(2 )adsorption when the concentration was >1.0 mmol L~(-1).The effect of change in concentration of the organic acids on Cd~(2 )and Pb~(2 )adsorptions varied with minerals,and was more obvious on goethite than on bentonite.The effect of the organic acid on Cd~(2 )adsorption intensity on bentonite was greater than on goethite even if the concentration of added Cd~(2 ) (varie)d.The(effect) of low concentration organic acid promoting Cd~(2 )adsorption by bentonite was more obvious when the concentration of Cd~(2 ) was high(8.0 mmol L~(-1)) than when it was low(0.4 mmol L~(-1)),but the inhibiting effect of high concentration organic acids on Cd~(2 ) adsorption by bentonite remain approximate whether the concentration of Cd~(2 ) was high or low.The Cd~(2 )adsorption by (goethite) was more obviously promoted by tartaric acid and citric acid than by acetic acid when they were low in concentration((<0.6 mmol L~(-1))),but the promoting effects of the three organic acids on Cd~(2 ) adsorption by goethite were similar.When the(concentrations)(>1.0 mmol L~(-1)) of the organic acids were high,their effects on Cd~(2 )adsorption by goethite were stable,but the Cd~(2 )adsorption by bentonite was more obviously restricted by citric acid than by acetic acid or tartaric acid.The effects of the three kinds of organic acids on Pb~(2 )adsorption on two minerals were almost the same. |
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| Keywords: | Cd2 Pb2 |
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