Abstract
The present study examines the sorption of Cs (I) and Sr (II) on organic sorbents in the pH range from 2 to 10, as well as the mechanisms of their binding. In order to determine the influence of the physical properties and the quantity of functional groups of the organic sorbents on sorption, experiments were carried out on organic materials of varying degrees of metamorphism: high-moor peat, hard and brown coals and shungite. A detailed description of their mineral composition, cation exchange capacity, buffering capacity and elemental composition of sorbents is provided. XRD, XRF, SEM and BET adsorption methods were used for assaying. As a result of the conducted research, it can be concluded that Sr (II) showed a higher sorption per unit specific surface area than Cs (I) in the studied range of concentrations and pH values. Sr (II) sorption decreases in the following order: high-moor peat > brown coal > shungite > hard coal. The sorption of Cs (I) is highest on brown coal and lesser for high-moor peat, shungite and hard coal. It is suggested that Cs (I) and Sr (II) can be fixed on carboxyl functional groups and Cs (I), possibly, in insignificant amounts on phenolic hydroxyls of all four studied organic sorbents.
Highlights
Ensuring the safety of nuclear legacy facilities involves the disposal of highactivity waste in underground storage facilities, and the isolation and reclamation of millions of tons of intermediate and low-level waste placed in near-surface storage facilities [1,2]
The main problem for many such facilities is the proximity of rivers and other watercourses, which gives rise to the need to use waterproofing [3] and filtration barriers for effective sorption of radionuclides
Since XRD analysis determined the crystalline phasescontain an admixture of mineral phases
Summary
Ensuring the safety of nuclear legacy facilities involves the disposal of highactivity waste in underground storage facilities, and the isolation and reclamation of millions of tons of intermediate and low-level waste placed in near-surface storage facilities [1,2]. Wastewater treatment with a low content of heavy metals using organic sorbents is known to be an efficient and relatively cheap method, and is used as an alternative to synthetic resins and other more expensive materials [4,5,6,7]. The advantage of organic sorbents is the ability to utilize the waste material by incineration, which can significantly reduce the volume of waste of the first and second classes. High-moor peat is formed on high moors and waterlogged areas as a result of decomposition of plant debris. The main peat-forming agents in such bogs are sphagnum mosses [8]
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