PRODUCTION OF SULFOCATIONITE BY MODIFICATION OF NATURAL COAL WITH CONCENTRATED SULFURIC ACID
Ключевые слова:natural coal, modified coal, sorption, rare metal ion, sulfonated coal, water purification.
Monitoring the content of rare metals in environmental objects at the level of their maximum
permissible concentrations is an important environmental task. The widely used physicochemical methods do not
always provide a direct solution to this problem because of the influence of the matrix composition of the sample on
the results of the determinations, as well as low concentrations of the determined elements. This article proposes a
new modified sulfonated charcoal based on coal from the Shubarkul deposit for sorption of rare metal ions from
water bodies. Concentrated sulfuric acid (H2SO4) is used as a modifier. The synthesis of new highly permeable crosslinked, sulfonated cation exchangers and their composition, structure by chemical and physical methods was
investigated. The static exchange capacity (SЕС) of sulfonated coal was calculated. The article shows an increase in
SEC from the concentration used in the modification of H2SO4. During the synthesis, the static exchange capacity of
sulfonated coal increases at 240 min. heating up. The temperature stability of sulfonated coal is higher to (100-120 °)
C. Sulfonated coal refers to medium acid cation exchangers, which work effectively at pH 2-14. The resulting
sorption materials are recommended for use in treatment plants for the removal of rare metal ions.