Features of the Sorption Process of Water Purifi cation from Surfactants Using Organomineral Sorption Materials

The sorption purifi cation method is widely used to extract various pollutants, including surfactants. The paper considers the features of the sorption process in the purifi cation of model waters from anionic surfactants. Sodium lauryl sulfate was used as a surfactant. Sorption materials were obtained from carbonate-containing waste from the sugar industry and diatomaceous sludge from the brewing industry by thermal modifi cation. The studies used both individual sorption materials and their mixtures in various proportions. In the process of model water purifi cation, it was found that the highest effi ciency of surfactant extraction is achieved by using diatomaceous sludge, heat-treated at 450 °C and hydrophobized with stearic acid. High effi ciency values were also obtained using hydrophobized carbonate-containing sludge, heat-treated at 450 °C. and hydrophobized diatomaceous sludge, heat-treated at 550 °C. For a better understanding of sorption processes, a sorption isotherm was constructed for diatomaceous sludge heat-treated at 450 °C and hydrophobized with stearic acid. According to the classifi cation of the International Union of Pure and Applied Chemistry, the resulting curve can be attributed to type I isotherms. The calculations performed using the mathematical models of Langmuir, Freundlich, BET, TOSM, Dubinin-Radostkevich, Temkin showed that the mechanism of sorption interaction is best described by the Langmuir model. This suggests that the adsorption process proceeds according to the monomolecular type, with the distribution of sorbate between energetically equivalent active centers.