Síntese e utilização de sílica mesoporosa magnética modificada para remoção do surfactante cloreto de dodecilpiridínio contido em águas

Abstract

Some contaminants may be carcinogenic or cumulative, responsible for the proliferation of pathogenic microorganisms, algae or the destruction of life and, therefore, must be removed or have their concentration levels below the permitted limits, as in the case of the surfactant dodecylpyridinium chloride. Surfactants are tensoactives that interfere with the aeration rate and the luminosity rate in the water, in this sense, on the present study it was synthesized and characterized particles of iron oxide coated with modified mesoporous silica covered with cationic surfactant cetyltrimethylammonium bromide. The material was tested in the removal of the surfactant dodecylpyridinium chloride (DPC) contained in water. The solid was able to remove 89% of the contaminant, showing a maximum adsorption capacity (qmax) of approximately 5.5 mg of DPC per gram of adsorbent. The reaction equilibrium showed to be fast with 85% of DPC removal in 1 minute of contact with the adsorbent, and adsorption followed the pseudo-second-order kinetic model with a rate constant of 31.80 mg.g-1.min-1.