有机酸对针铁矿和膨润土吸附Cd2+、Pb2+的影响
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* 国家自然科学基金项目(No.40371065);华中农业大学科研启动基金(No.52204-04068)资助


EFFECTS OF ORGANIC ACIDS ON ADSORPTION OF Pb2+ AND Cd2+ BY GOETHITE AND BENTONITE
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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Cd2+、Pb2+的影响。结果表明:(1)低浓度(<0.6 mmol L-1)有机酸促进供试矿物吸附Cd2+和Pb2+,随着有机酸浓度增加,吸附逐渐被抑制。高浓度(>1.0 mmol L-1)有机酸对Pb2+吸附的抑制作用比对Cd2+的强。有机酸浓度的变化对针铁矿Cd2+、Pb2+吸附率的影响大于对膨润土的。(2)不同Cd2+浓度下,有机酸对膨润土Cd2+吸附强度的影响大于针铁矿。加入高浓度Cd2+(8.0 mmol L-1)时,低浓度有机酸对膨润土吸附Cd2+的促进作用比加入低浓度Cd2+(0.4 mmol L-1)时明显,高浓度有机酸对膨润土吸附Cd2+的抑制作用与低浓度Cd2+时相近。(3)低浓度有机酸(<0.6 mmol L-1)时,酒石酸、柠檬酸对针铁矿吸附Cd2+的促进作用大于乙酸,而它们对膨润土吸附Cd2+的促进作用相似;在三种有机酸高浓度(>1.0 mmol L-1)时,针铁矿对Cd2+的吸附都趋于稳定,而柠檬酸对膨润土吸附Cd2+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Pb2+吸附率大小的变化基本一致。

    Abstract:

    Effects of organic acids(acetic acid,tartaric acid and citric acid)on adsorption of Cd2+ and Pb2+ by goethite and bentonite were studied with the batch method.The results show that Cd2+ and Pb2+ 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 Pb2+ adsorption by goethite and bentonite were stronger than on Cd2+ adsorption when the concentration was >1.0 mmol L-1.The effect of change in concentration of the organic acids on Cd2+ and Pb2+ adsorptions varied with minerals,and was more obvious on goethite than on bentonite.The effect of the organic acid on Cd2+ adsorption intensity on bentonite was greater than on goethite even if the concentration of added Cd2+ varied.The effect of low concentration organic acid promoting Cd2+ adsorption by bentonite was more obvious when the concentration of Cd2+ 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 Cd2+ adsorption by bentonite remain approximate whether the concentration of Cd2+ was high or low.The Cd2+ 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 Cd2+ adsorption by goethite were similar.When the concentrations(>1.0 mmol L-1)of the organic acids were high,their effects on Cd2+ adsorption by goethite were stable,but the Cd2+ 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 Pb2+ adsorption on two minerals were almost the same.

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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. DOI:10.11766/trxb200411260114 Huang Li, Wang Ru, Hu Hongqing, 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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  • 收稿日期:2004-11-26
  • 最后修改日期:2005-06-12
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  • 在线发布日期: 2013-02-25
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