Optimization of the pentachlorophenol adsorption by organo-clays based on response surface methodology
Fecha
2022Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión publicada / Argitaratu den bertsioa
Impacto
|
10.3390/ma15207169
Resumen
The aim of this study is to optimize the adsorption of pentachlorophenol (PCP) using an
organo-clay under the response surface methodology. The adsorbent was selected from a montmorillonite exchanged by various cations, such as Fe3+, Al3+, Zn2+, Mg2+, Na+
, and modified by
bromide cetyltrimethylammonium (CTAB) as surfactant. The obtained organo-montmorillonite was
characterized using several ...
[++]
The aim of this study is to optimize the adsorption of pentachlorophenol (PCP) using an
organo-clay under the response surface methodology. The adsorbent was selected from a montmorillonite exchanged by various cations, such as Fe3+, Al3+, Zn2+, Mg2+, Na+
, and modified by
bromide cetyltrimethylammonium (CTAB) as surfactant. The obtained organo-montmorillonite was
characterized using several techniques, such as Fourier-transform infrared spectroscopy (FTIR), X-ray
diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and
nitrogen adsorption, performed at −196 ◦C. The results showed an increase in basal space from 1.65
to 1.88 nm and a decrease in the specific surface and pore volume, with an increase in pore diameter,
including the presence of characteristic bands of -CH2
- and -CH3
- groups at 2926 and 2854 cm−1
in
the FTIR spectrum after the modification. The optimization of PCP removal by clay adsorbents is
achieved using the response surface methodology (RSM) with a four-factor central composite model,
including pH of solution, mass of adsorbent, contact time, and initial concentration. The results
proved the validity of the regression model, wherein the adsorption capacity reaches its maximum
value of 38 mg/g at a lower adsorbent mass of 20 mg, pH of 6, contact time (tc) of 5 h, and initial
concentration of 8 mg/L. [--]
Materias
Adsorption,
Montmorillonite,
Organo-clay,
Pentachlorophenol,
Response surface methodology
Editor
MDPI
Publicado en
Materials 2022, 15, 7169
Departamento
Universidad Pública de Navarra. Departamento de Ciencias /
Nafarroako Unibertsitate Publikoa. Zientziak Saila /
Universidad Pública de Navarra/Nafarroako Unibertsitate Publikoa. Institute for Advanced Materials and Mathematics - INAMAT2
Versión del editor
Entidades Financiadoras
S.E.M. thanks the Universidad Pública de Navarra for a doctoral grant. A.G. also thanks
Banco Santander for funding through the Research Intensification Program.