腐殖酸的存在增强了高岭土对铜和镉的吸附作用。
Enhancement of copper and cadmium adsorption on kaolin by the presence of humic acids.
作者信息
Arias M, Barral M T, Mejuto J C
机构信息
Area de Edafoloxía e Química Agricola, Facultade de Ciencias de Ourense, Universidade de Vigo, Spain.
出版信息
Chemosphere. 2002 Sep;48(10):1081-8. doi: 10.1016/s0045-6535(02)00169-8.
The competitive adsorption equilibrium isotherms of Cu2+ and Cd2+ on kaolin have been measured at 298 K, in the presence and the absence of humic acids (HAs). HAs were found to enhance the metal adsorption capacity of mineral surfaces, in particular kaolin. This enhancement was also observed in the competitive adsorption of copper and cadmium on kaolin and kaolin-HA complex. This competitive adsorption shows that the presence of Cd2+ has not an important effect on Cu2+ adsorption, whereas a dramatic decrease is observed on the adsorption of Cd2+ in the presence of Cu2+. The Freundlich isotherm equation was found to provide an excellent fit to the experimental data. These results were compared with the independent adsorption of both heavy metals.
在298K下，测定了在有无腐殖酸（HAs）存在的情况下，高岭土对Cu2+和Cd2+的竞争吸附平衡等温线。发现腐殖酸能提高矿物表面，特别是高岭土对金属的吸附能力。在高岭土和高岭土 - 腐殖酸复合物上铜和镉的竞争吸附中也观察到这种增强作用。这种竞争吸附表明，Cd2+的存在对Cu2+吸附没有重要影响，而在Cu2+存在的情况下，Cd2+的吸附量则显著下降。发现弗伦德利希等温线方程能很好地拟合实验数据。将这些结果与两种重金属的独立吸附情况进行了比较。
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