Hydrophobization of Diatomite-Magnetite Composite Surface with Laurylpropylenediamine

Cleaning water from oil and oil products is one of the pressing problems of our time. One of the effective methods of water purification is sorption. In this regard, hydrophobized composite sorbents based on diatomite and magnetite were obtained; laurylpropylenediamine was used to hydrophobize their surface. The presence of magnetite and laurylpropylenediamine in the composites is substantiated based on SEM, FT-IR and X-ray fluorescence analysis data. The hydrophobization of the surface of the diatomite-magnetite composite is assessed by the change in its ζ-potential and wettability. The study of crude oil adsorption on the surface of the composite sorbents showed that when moving from the diatomite-magnetite composite to the diatomite-magnetite-laurylpropylenediamine composite, adsorption increases from 3.0 to 3.5 g/g, and the degree of oil extraction increases from 92.0 to 96.0%. The BET method showed that the specific surface area of diatomite is 67.8 m2/g, and when forming diatomite-magnetite and diatomite-magnetite-laurylpropylenediamine composites, it decreases to 13.5 m2/g and 10.3 m2/g, respectively. Based on this, it was concluded that the increase in adsorption and the degree of oil extraction after coating the surface of the diatomite-magnetite composite with laurylpropylenediamine, is due to its hydrophobization.