Chen J Paul, Wu Shunnian
Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260 Singapore.
J Colloid Interface Sci. 2004 Dec 15;280(2):334-42. doi: 10.1016/j.jcis.2004.08.029.
In this study, simultaneous adsorption of copper ions and humic acid (HA) from Aldrich onto an activated carbon is investigated. It is found that the HA adsorption in the absence of copper decreases as the pH is increased. It leads to a reduction of 34.7% in the specific surface area of carbon. There exists a critical concentration (CC) of HA for copper adsorption. At HA concentrations < CC, a decrease in copper adsorption is observed; however, the HA improves the adsorption at HA concentrations > CC. An increase in ionic strength can enhance the copper uptake; however, zinc and/or cobalt ions have an insignificant influence on copper adsorption. The adsorption is significantly increased by citric acid, whereas addition of EDTA slightly decreases the uptake. An intraparticle diffusion model is successfully used to describe the copper adsorption kinetics.
在本研究中，研究了从奥德里奇试剂中同时吸附铜离子和腐殖酸（HA）到活性炭上的情况。发现在不存在铜的情况下，随着pH值升高，HA的吸附量降低。这导致碳的比表面积减少34.7%。对于铜的吸附存在一个HA的临界浓度（CC）。在HA浓度<CC时，观察到铜吸附量下降；然而，当HA浓度>CC时，HA会提高吸附量。离子强度的增加可以增强铜的吸收；然而，锌和/或钴离子对铜的吸附影响不显著。柠檬酸显著增加吸附量，而添加乙二胺四乙酸（EDTA）会使吸收量略有降低。颗粒内扩散模型成功地用于描述铜的吸附动力学。
