TITLE:
New Polysiloxane Surfaces Modified with ortho-, meta- or para-Nitrophenyl Receptors for Copper Adsorption
AUTHORS:
Smaail Radi, Nouraddine Basbas, Said Tighadouini, Maryse Bacquet
KEYWORDS:
Modified Surfaces; Chemical Synthesis; Characterization; Adsorption; Cu(II)
JOURNAL NAME:
Journal of Surface Engineered Materials and Advanced Technology,
Vol.4 No.1,
January
16,
2014
ABSTRACT:
Porous SiO2 has been
chemically modified with functional ortho-, meta- or para-nitrophenyl moieties using the heterogeneous
route. This synthetic route involved the reaction of carbaldehyde derivatives
with 3-aminopropyl trimethoxysilane prior to immobilization on the support. The
new modified surfaces have been characterized by elemental analysis, FT-IR, 13C NMR of the solid
state, nitrogen adsorption-desorption isotherm, BET surface area, B.J.H. Pore
sizes, thermogravimetry curves (TGA) and scanning electron microscope (SEM).
The new materials exhibit good chemical and thermal stability. These products
were employed as a Cu(II) adsorbent from aqueous solutions at room temperature
using the batch technique. Flame atomic absorption spectrometry was used to
determine the Cu(II) concentration in the filtrate after the adsorption
process. The results indicate that under the optimum conditions, the maximum
adsorption value for Cu(II) was 20.0 mg Cu(II) g-1 modified silica, whereas the adsorption
capacity of the unmodified silica was only 1.0 mg Cu(II) g-1 silica. On the basis of these results,
it can be concluded that it is possible to modify chemically SiO2 with functional groups and use it as adsorbents for metals in aqueous media.