Sorbent based on thermally oxidized sapropel for wastewater treatment from phenols, oil products and heavy metals
I.V. Zykova, V.A. Isakov, N.M. Mishina
Section: Ecologization of industry
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.
Keywords: adsorption, thermally oxidized sapropel, phenols, petroleum products, heavy metals
Article published in number 3 for 2025 DOI: 10.25750/1995-4301-2025-3-134-141
ISSN 1995-4301
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