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In this study, we successfully coated cetyltrimethylammonium–silica onmagnetite. The material produced is used to degrade phenol waste in the waters. Theeffect of the addition of cetyltrimethylammonium bromide (CTAB) on the ability ofphenol adsorption was assessed through changes in CTAB concentration of 1, 5, and10 mM. The results of Fourier-transform infrared spectroscopy explain thatCTAB has electrostatic interactions with the silica surface, which is induced byopposite-loaded patches on the opposite surface of silica oxide. The results of thevibrating sample magnetometer show that the magnetite that has been coated bysilica–CTA has magnetic properties that are weaker than the initial magnetite,which indicates that the silica–CTA layer has blocked the magnetite. Based onthe measurement of the gas sorption analyzer, the largest pore size is in themicro-mesh region, which is between 2 and 6 nm. Allmagnetite-silica–cetyltrimethylammonium (MS–CTA) showed good adsorptionability of phenol and correlated with the amount of loaded CTAB and admicelle densityof the adsorbent. The amount of phenol adsorbed increases proportionately with theincreasing density of CTAB admicelles. The maximum phenol adsorption capacity(0.93 mg g −1  adsorbent) is achieved byMS–CTA prepared at a CTAB concentration of 10 mM.

Preparation of magnetite-silica–cetyltrimethylammonium for phenol removal based on adsolubilization