Adsorption of Phenol and Dichlorophenols from Aqueous Solutions by Porous Clay Heterostructure (PCH)
Experiments have been conducted to examine the adsorptionof phenol and dichlorophenols (2,5 DCP and 3,4 DCP) fromwater by a Porous Clay Heterostructure (PCH). Experiments werecarried out for the analysis of adsorption equilibrium capacities usinga batch equilibrium technique. The Freundlich adsorpti...
| Autores: | , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | México |
| Recursos: | Instituto Politécnico Nacional |
| Repositorio: | Redalyc-IPN |
| OAI Identifier: | oai:redalyc.org:47549306 |
| Acesso em linha: | https://www.redalyc.org/articulo.oa?id=47549306 |
| Access Level: | acceso abierto |
| Palavra-chave: | Multidisciplinaria (Ciencias Naturales y Exactas) PCH clay phenol adsorption dichlorophenols adsorption |
| Resumo: | Experiments have been conducted to examine the adsorptionof phenol and dichlorophenols (2,5 DCP and 3,4 DCP) fromwater by a Porous Clay Heterostructure (PCH). Experiments werecarried out for the analysis of adsorption equilibrium capacities usinga batch equilibrium technique. The Freundlich adsorption model wasbest to describe adsorption equilibrium data for dichorophenols (r2 =0.994 for 3,4 DCP and r2 = 0.993 for 2,5 DCP). In the case of theadsorption of phenol, the isotherm model of Langmuir was best todescribe the experimental data (r2 = 0.9839) at high equilibrium concentrations(0-500 ppm), while at low equilibrium concentrations (0-20 ppm) the Freundlich model was best to describe the data (r2 =0.9831). This deviation implies that the adsorption sites are heterogeneous.The adsorption capacity showed by the PCH for both phenoland DCPs from water (48.7 mg/g for 3,4-DCP, 45.5 mg/g for 2,5-DCP and 14.5 mg/g for phenol), suggests that the PCH have both,hydrophobic and hydrophilic characteristics, due to the presence ofsilanol and siloxane groups formed during the pillaring and preparationof the PCH |
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