研究论文
王子健.重金属离子在腐殖酸表面的吸附——类颗粒表面吸附模型[J].环境科学学报,1987,7(3):313-318
重金属离子在腐殖酸表面的吸附——类颗粒表面吸附模型
- INTERACTION BETWEEN HEAVY METALS AND HUMIC ACID——QUARSI-PARTICLE SURFACE COMPLEXATION MODEL
- 摘要：本实验用伏安质子滴定法获得重金属离子(Cu2+、Pb2+、Cd2+)在腐殖酸表面吸附的实验数据,并基于这些数据提出重金属离子在腐殖酸表面的络合模型。模型中引入两个实验常数:反应系数α和竞争反应常数KH。实验结果表明,这两个常数的实验值在一相当宽的起始溶液条件下基本稳定。基于这两个常数而获得的pH相关吸附等温线和实验数据相当符合。模型中采用了由电位滴定得到的腐殖酸表面羧基浓度作为最大表面基团浓度,并对其质子解离常数进行了表面电荷影响的修正。
- Abstract：Interaction between metals and humic acid was studied by application of voltammetric titration technique. Two parameters were introduced into a quarsi-particle surface complexation model and were found to be nearly constant under various initial solution conditions. The fitting of pH-dependent adsorption isotherms of Pb, Cu, and Cd on humic acids from both China and Switzerland using these two parameters was satisfactory. The calculation was performenced via the total surface carboxylic content corrected for proton dissociation and surface charge influence and voltammetric non-labile current corrected for partial dissociation.
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