Domínguez-Vargas Joaquín R, Navarro-Rodríguez Juan A, de Heredia Jesús Beltrán, Cuerda-Correa Eduardo M
Department of Chemical Engineering and Physical Chemistry, Faculty of Sciences, University of Extremadura, E-06071 Badajoz, Spain.
J Hazard Mater. 2009 Sep 30;169(1-3):302-8. doi: 10.1016/j.jhazmat.2009.03.075. Epub 2009 Mar 27.
The adsorption process of chlorophenols (CPs) by low-cost adsorbents such as carbon blacks has been studied. The influence of different parameters such as temperature, pH, ionic strength and textural properties of the adsorbents on the adsorption process of pentachlorophenol has been analyzed. The adsorption process is exothermal and parameters such as pH and ionic strength exert a noticeable influence on the adsorption capacity of the solute. These parameters influence the adsorption capacity in an opposite manner. Thus an increase in pH seems to unfavor the adsorption process, whereas the adsorption capacity increases with increasing ionic strength. In order to analyze the influence of the number of chlorine atoms in the molecule of solute the adsorption process of different chlorophenols (i.e., 4-chlorophenol, 3,5-dichlorophenol, 2,4,6-trichlorophenol and 2,3,4,6-tetrachlorophenol) was analyzed. As the number of chlorine atoms (and thus the volume of the molecule) increases, the penetration of the solute through the porous texture of the adsorbent is difficult and, consequently, the adsorption capacity decreases.
人们已经研究了诸如炭黑等低成本吸附剂对氯酚（CPs）的吸附过程。分析了温度、pH值、离子强度和吸附剂的结构性质等不同参数对五氯酚吸附过程的影响。吸附过程是放热的，pH值和离子强度等参数对溶质的吸附容量有显著影响。这些参数对吸附容量的影响方式相反。因此，pH值的升高似乎不利于吸附过程，而吸附容量随离子强度的增加而增加。为了分析溶质分子中氯原子数量的影响，对不同氯酚（即4-氯酚、3,5-二氯酚、2,4,6-三氯酚和2,3,4,6-四氯酚）的吸附过程进行了分析。随着氯原子数量（进而分子体积）的增加，溶质通过吸附剂多孔结构的渗透变得困难，因此吸附容量降低。
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