New insights about reactive red 141 adsorption onto multi–walled carbon nanotubes using statistical physics coupled with Van der Waals equation
| Autor: | Guilherme Luiz Dotto, Felipe K. Rodrigues, Nina P.G. Salau |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Van der Waals equation Filtration and Separation 02 engineering and technology Carbon nanotube 021001 nanoscience & nanotechnology Analytical Chemistry law.invention symbols.namesake Adsorption 020401 chemical engineering law symbols Molecule Statistical physics 0204 chemical engineering van der Waals force 0210 nano-technology Saturation (chemistry) |
| Zdroj: | Separation and Purification Technology. 224:290-294 |
| ISSN: | 1383-5866 |
| DOI: | 10.1016/j.seppur.2019.05.042 |
| Popis: | In this communication, statistical physics models (sta–phy) coupled with the Van der Waals (VDW) state equation were employed to demonstrate insights regarding the reactive red 141 (RR 141) adsorption onto multi–walled carbon nanotubes (MWCNTs). Experimental isotherms were constructed for two types of carbon nanotubes (MWCNTs–OH and MWCNTs–COOH) at four different temperatures (298, 308, 318 and 328 K). These curves were predicted by sta–phy models coupled or not with the VDW state equation. It was demonstrated that the sta–phy coupled with VDW equation was able to predict the experimental isotherms more accurately than the other used models. Based in this approach, insights about RR 141 adsorption on the MWCNTs were presented considering the following parameters: number of molecules adsorbed at first and second site (n1 and n2), density of first and second receptor site (Nm1 and Nm2), concentration at half saturation relative to the first and second receptor site (W1 and W2) and VDW interaction parameters (a and b). The Van der Waals parameter related with the co–volume of the adsorbate molecule (b) was significant and ranged from 0.00001 to 0.00302 L mg−1. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect