The adsorption of solutions of petroleum products with concentrations from 10 to 150 mg/dm3, phenols with concentrations from 0.01 to 1.0 mmol/dm3 and heavy metals with concentrations from 0.1 to 100 mmol/dm3 was studied. Sapropel, heat-treated at 600 оC in an oxidizing medium (TOS), was used as a sorbent. The assessment was carried out under static conditions at 1 g of sorbent per 200 cm 3 of solution. Processing of experimental data according to the Boyd and Morris-Weber kinetic models showed that copper(II) ions adsorption by TOS has a mixed-diffusion character. The dependence of the copper(II) ions adsorption by TOS on the contact time is satisfactorily described by both Lagergren and Ho and McKay kinetic models. The thermodynamic values of the adsorption of copper(II) ions from a model solution by TOS were calculated using Ho and McKay kinetic model, taking into account the chemical interaction between the copper(II) ion and the functional groups of the adsorbent. However, it is quite difficult to determine the proportion of chemical interaction and diffusion based on formal kinetic equations. It was established that resorcinol adsorption is described by the Dubinin-Radushkevich equation, while the oil products and copper(II) ions adsorption is described by the Brunauer-Emmett-Teller polymolecular adsorption equation (BET). The calculated quantitative characteristics of resorcinol, copper(II) ions and oil products adsorption by TOS showed that TOS can be used as a sorbent for wastewater treatment from oil products, phenols and heavy metals.

Comprehensive wastewater treatment from various pollutants is an urgent problem, and the development of new sorbents is of great scientific and practical importance. Sorbents based on sapropel were obtained: thermally oxidized sapropel, humic acids isolated from sapropel, thermally oxidized sapropel modified with humic acids, organomineral composite material based on thermally oxidized sapropel and bentonite. Resorcinol adsorption from model solutions with concentrations from 1 · 10-5 to 1 · 10-2mol/dm3 onsapropel-based sorbents was carried out under static conditions at a ratio of 1 g of sorbent per 200 cm3 of solution. It is shown that the limiting stage of resorcinol adsorption onsapropel-based sorbents is mixed diffusion. The adsorption theories of Langmuir, Freundlich, Brunauer–Emmett–Teller (BET) and Dubinin–Radradkevich are applicable to describe the resorcinol adsorption onsapropel-based sorbents. Taking into account the values of the activation energy and thermodynamic parameters of resorcinol adsorption, the obtained sapropel-based sorbents can be considered as the mechanism of resorcinol adsorption on the surface and physical adsorption due to volumetric filling of micro- and mesopores, as well as cavities. Resorcinol can also form covalent and hydrogen bonds with silicate and aluminosilicate groups, and hydrogen bonds with amino groups with sapropel-based sorbents. Therefore, it is quite difficult to separate the contribution of physical adsorption and possible chemical interactions of functional groups of sapropel-based sorbents with resorcinol. Limiting values of resorcinol adsorption onsapropel-based sorbents calculated by the BET equation (0.25–1.00 mmol/ g) and the Dubinin–Radushkevich equation (0.52–2.60 mmol/g), comparable to other developed sorbents.