Division of Chemical Technology, School of Chemistry, Aristotle University of Thessaloniki, GR-541 24 Thessaloniki, Greece.
J Colloid Interface Sci. 2013 Oct 1;407:432-41. doi: 10.1016/j.jcis.2013.05.052. Epub 2013 Jun 18.
In the present work, the simultaneous adsorption of Remazol Red 3BS (reactive dye) and Cr(VI) onto chitosan powder grafted with poly(ethylene imine) and cross-linked with epichlorohydrin is experimentally studied. Such a combination of a dye molecule and a heavy metal can be found in real/practical conditions of environmental pollutants' removal, so their mutual interaction on the adsorption efficiencies is very important. The experimental data revealed a competitive type of interaction between the dye molecule and heavy metal ion. An attempt is made to quantitatively describe the data through appropriate isotherms and kinetic equations. The data demonstrated that the common thermodynamic equilibrium is not obtained for the present problem and the final composition of the adsorbed phase depends also on the kinetics. A new scenario of irreversible kinetic-based equilibrium was introduced and examined in detail. None of the scenarios considered here is fully able to cover the whole data, so semi-empirical equations are introduced for their description. It is shown that further development of phenomenological models requires more complicated experimental protocols than simple simultaneous adsorption of the species.
在本工作中，通过实验研究了用聚乙烯亚胺接枝壳聚糖粉末并与表氯醇交联来同时吸附活性染料 Remazol Red 3BS 和 Cr(VI)。在环境污染物去除的实际/实际条件下，可以发现染料分子和重金属的这种组合，因此它们在吸附效率上的相互作用非常重要。实验数据表明，染料分子和重金属离子之间存在竞争型相互作用。尝试通过适当的等温线和动力学方程对数据进行定量描述。数据表明，对于目前的问题，不会获得常见的热力学平衡，并且吸附相的最终组成也取决于动力学。引入并详细检查了基于不可逆动力学的新平衡情景。这里考虑的情景都不能完全涵盖所有数据，因此引入了半经验方程来对其进行描述。结果表明，与简单地同时吸附物种相比，要开发更复杂的经验模型，需要更复杂的实验方案。
