白陶瓷土对多元重金属体系吸附特性研究

发布时间：2018-04-27 00:40

本文选题：白陶瓷土 + 铅　；参考：《岩土工程学报》2017年05期

【摘要】：主要研究了白陶瓷土对一元(Pb,Cd,Cu)、二元(Pb-Cd,Pb-Cu,Cu-Cd)、三元(Pb-Cd-Cu)体系下金属离子的吸附特性。在一元体系下,分析了白陶瓷土对不同金属的动力学与等温平衡吸附特性,试验结果表明,白陶瓷土对3种金属离子的吸附为快速反应,3 h即可达到平衡吸附,伪二级动力学模型计算结果与试验结果吻合较好,Langmuir模型可较好地预测白陶瓷土对3种金属的等温吸附过程。最大吸附量由大到小的顺序为PbCuCd。在Pb-Cd,Pb-Cu二元体系下,Cu可显著抑制白陶瓷土对Pb的吸附,且吸附量随Cu增加而下降,Cd的影响相对较小;Cu-Cd二元体系下,当Cu浓度高于某一值时,Cd的吸附受到明显抑制,且不随Cu浓度变化而变化。在三元体系下,受离子间竞争吸附叠加效应影响,3种金属的吸附量均显著下降,Pb的吸附量随Cu与Cd浓度增加而下降,而Cu与Cd的吸附量受Pb浓度变化影响较小。
[Abstract]:The adsorption characteristics of metal ions in the system of PbCd-Cu, Pb-CdPb-Cu-Cu-CdCd-Cu and Pb-Cd-Cu were studied in this paper. The kinetics and isothermal equilibrium adsorption properties of white ceramic soil to different metals were analyzed in a monolithic system. The experimental results showed that the adsorption of three metal ions by white ceramic soil could reach equilibrium after 3 hours of rapid reaction. The calculated results of pseudo-second-order kinetic model are in good agreement with the experimental results. The Langmuir model can predict the isothermal adsorption process of three metals on white ceramic soil. The order of maximum adsorption capacity from large to small is PbCuCd. In the binary system of Pb-CdPb-Cu, Cu can significantly inhibit the adsorption of Pb on white ceramic soil, and the adsorption amount decreases with the increase of Cu. The effect of Cu concentration on the adsorption of CD is relatively small in Cu-CD binary system. When Cu concentration is higher than a certain value, the adsorption of CD is inhibited obviously. And it does not change with the concentration of Cu. In the ternary system, the adsorption capacity of the three metals decreased significantly with the increase of Cu and CD concentration, but the adsorption capacity of Cu and CD was less affected by Pb concentration.
【作者单位】：大连理工大学岩土工程研究所;大连理工大学海岸与近海工程国家重点实验室;
【基金】：国家自然科学基金项目(41572252)
【分类号】：O647.3;X703

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