Modeling competitive adsorption of chlorinated volatile organic compounds with the Dubinin–Radushkevich equation

✍ Scribed by Thomas P O'Connor; James Mueller

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 157 KB
• Volume: 46
• Category: Article
• ISSN: 1387-1811
• DOI: 10.1016/s1387-1811(01)00317-1

✦ Synopsis

A recent paper showed that the breakthrough curves of volatile organic compound (VOC) mixtures on zeolite replaced the adsorbates in order of decreasing boiling points (PCE > TCE > DCA > DCM) and could be predicted by the boiling point of the compounds (similar to distillation). A previous study by the authors found a similar result on granulated activated carbon (PCE > TCE > CTC > TCA > t-12DCE > CHL > DCE), but used another thermodynamic property, the heat of vaporization to predict the breakthrough order. The authors had used the heat of vaporization in a model, based on the Dubinin±Radushkevich equation, to predict the adsorption of several VOCs onto granulated activated carbon with isotherm data of only one compound.

This paper shows that the use of either the heat of vaporization or the boiling point are interchangeable. Both predicted the breakthrough curves of a mixture of adsorbates from granulated activated carbon and either can be used for a competitive adsorption model employing the Dubinin±Radushkevich equation.