The influence of sol gel drying temperature to surface aggregate structure of CTAB on magnetite silica as phenol adsorbent

Abstract

The Magnetite silica-CTAB (MS-CTAB) as phenol adsorbent was made with sol gel process. Magnetite silica was functionalized with cetyltrimethylammonium bromide to increase the tendency as phenol adsorbent. The aim of this paper was to investigate, the role of drying temperature parameter in sol-gel routes that influence CTAB micelles formation on magnetite silica. CTAB varied upper the CMC (1 mM, 5 mM, 10 mM) in two varied temperatures (80 and 350°C). The deconvolution of FTIR spectra showed that the heating at relative high temperatures (350°C) accelerate condensation phase, remove the water and lead the formation of covalent Si-O-Si bonds and reduce Si-OH bonds compared with 80°C. The aggregate structure of CTAB seem dependent on the amount of silanol. The adsorption diagram at pH 11 showed that the silanol bond influenced the CTAB formation on magnetite silica surfaces, end up in reducing the phenol adsorption capacity, with a reverse with low heating temperature.