Authors: N.I. Fedorova, I.Yu. Zykov, V.E. Tsvetkov

Title of the article: Modification of brown coal carbonizates to increase the efficiency of extraction of nickel ions from water

Year: 2023, Issue: 4, Pages: 49-57

Branch of knowledge: 2.6.12. Chemical technology of fuel and high-energy substances

Index UDK: 661.183.2; 543.312

DOI: 10.26730/1999-4125-2023-4-49-57

Abstract: The relevance of the research is determined primarily by the fact that the active use of carbon sorbents in various fields of technology requires an expansion of the range of carbon materials, as well as the creation of scientifically sound methods for their synthesis and modification. The purpose of the study is to obtain a modified carbon sorbent and study its sorption capacity with respect to nickel (II) ions. For the preparation of sorbents, a combined method was used, which is based on the production of porous materials from coal raw materials during high-temperature pyrolysis (carbonation), oxidation of the resulting carbonizate by means of perchloric acid and further conversion of the carbon sorbent into a cationic form during thermochemical treatment with sodium hydroxide. Brown coal from the Kaichaksky mine (Kemerovo region) was used as coal raw materials. Carbonation of coal was carried out in a muffle furnace at 800 ° C, treatment of carbonizate with perchloric acid (60%) – at room temperature with stirring for 3 hours (the ratio of carbonizate: acid = 1:10). The dried oxidized carbonizate sample was treated with an alkali solution with a concentration of 1 mol/l for 1.5 hours and then calcined in a muffle furnace at a temperature of 600 ° C for 1.5 hours. The sorbent obtained by the proposed method was investigated for sorption activity with respect to nickel (II) ions. It was found that the efficiency of modified sorbents reaches 99% at an initial concentration of 10 mg/l, which allows water purification from nickel to the level of MPC (0.1 mg/l). The obtained results can be used to select the conditions for obtaining sorbents with specified properties and methods of their regulation.

Key words: brown coal carbon sorbents oxidative modification adsorption nickel sorption capacity degree of extraction

Receiving date: 14.08.2023

Approval date: 15.09.2023

Publication date: 27.09.2023

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