The electrochemical behavior of thallium was studied on glassy carbon electrodes in sulfate solutions. Cyclic voltammetry was used to study the kinetics of the electrode processes and to determine the nature of the limiting step of the cathodic reduction of thallium ions. According to the dependence of current on stirring rate and scan rate, this process is diffusion limited. Chronocoulometry showed that the electrodeposition can be performed with a current efficiency of up to 96% in the absence of oxygen.
У роботі синтезовано шість композиційних полімерних електролітів (КПЕ) зі складом PVDF-PEG-LiClO4-X та різними наповнювачами (де X = LiF, Ce2O3, Na2SO4, Li3PO4, MgO, LiH2PO4). Визначено оптимальний склад КПЕ та наповнювача PVDF-PEG-LiClO4-Li3PO4. Досліджено вплив концентрації наповнювача на іонну провідність плівок, де оптимальна концентрація наповнювача 5 % Li3PO4 має найвищу іонну провідність 1.4310-4 Ом-1·см-1. Морфологію поверхні, електрохімічну та термічну стабільність отриманих ЦПЕ досліджено різними методами.
Present work considers the production of a cheap and effective sorbent based on natural clay originated from the Kyzylsok deposit (Almaty region, Kazakhstan) to purify wastewater from heavy metal ions (Cd 2+ , Pb 2+ ). It was found that the starting clay sample is applicable for the extraction of Cd 2+ ions (the degree of extraction is (97.40 ± 1.99) %), while for the extraction of Pb 2+ ions the initial clay must be modified by impregnation with 0.1 % polyvinylpyrrolidone (PVP) aqueous solution. The degree of extraction of Pb2+ ions with modified clay increased from (70.01 ± 1.77)% to (98.03 ± 1.13)%. The desorption of metal ions which was also investigated in the work did not exceed 2% confirming the usability of untreated and modified clay as sorbents for a long time. It was found that the sorption process is described by the monomolecular Langmuir isotherm model and the kinetic model of the pseudo-second-order.
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