SORPTION OF METAL IONS BY CARBON SORBENTS OBTAINED FROM WASTE
DOI:
https://doi.org/10.15421/jchemtech.v33i3.322419Keywords:
wastewater, water purification, metal ions, sorption, activated carbon, surface functional groupsAbstract
Industrial waste in many cases can be considered as secondary raw materials for the production of sorbents. The purpose of the work was to substantiate the possibility of using oxidized carbon sorbents to purify contaminated waters from Cu(II), Fe(II), Co(II), Ni(II) and Mn(II) compounds. The work used two variants of activated carbon (AC), made from agricultural plant waste with different ratios of sunflower husks and straw. Activation of carbon was carried out with water vapor at 800 °C, and oxidation with an 8 M HNO3 solution at 70 °C for 5 hours. The indicators of the process of extracting of metal ions by different types of AC were determined. The adsorption value of AC decreases in the series of ions Fe>Cu>Ni>Co>Mn. When using oxidized AC, the adsorption value of Cu(II) ions is greater than Fe(II). Among the cations, the adsorption values of Cu(II) and Fe(II) ions are the closest, regardless of the degree of oxidation of coal. It has been shown that an increase in the surface concentration of functional groups contributes to more efficient adsorption of oxidized activated carbon samples. There is a relationship between the composition of raw materials and its sorption properties. It was determined that increasing the acidity of the solution and increasing the concentration of metal ions reduces the adsorption efficiency. The presence of other metal ions also reduces the degree of purification of solutions from Cu(II) ions. The determining stage in the sorption mechanism of Cu(II) is complexation with oxygen-containing functional groups: carboxyl and phenolic, which shows the complex nature of sorption with a significant proportion of chemisorption. The identity of the sorption mechanisms of Cu(II) and Fe(II) ions was , which allows these ions to be sorbed together. The results are aimed at increasing the efficiency and completeness of the water purification process.
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