The Effect of Coal Sulfonation on Acid-Base Surface Centers
Murzakasymova N.S. Bektenov N.A. Bolysbekova S.M. Mitupov B.C. Serebriakov K.V. Gavrilenko M.A.
2025Siberian Federal University
Journal of Siberian Federal University: Chemistry
2025#18Issue 3331 - 342 pp.
Acid-base centers on the sulfonated coal surface have been studied with Hammett method using indicators of acid orange, acid blue anthraquinone and methylene blue. It has been established that sulfonated coal is a medium-acid sorbent of cations, which works effectively in the pH 4–10 range, which corresponds to all types of natural and industrial waters containing heavy metal cations. Elemental analysis of the resulting sulfonated coal showed the presence of sulfogroups on the surface in an amount of 3–4 %, which is sufficient for a monolayer uniform modification of the sorbent surface. The resulting sorbent is characterized by a specific micropore surface of 171 m2/g and a micropore volume of 0.062 cm3/g with dimensions of 0.8–2.0 nm, which corresponds to the majority for modified coals. The maximum sorption capacity of sulfonated coal on Cu (II) is 0.23 mg/g, compared with the sorption capacity of the source carbon material of 0.02 mg/g in a neutral medium.
coal , heavy metals , isotherms , modification , sorbent , sorption , sulfonated coal
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M.Kh. Dulaty Taraz Regional University, Taraz, Kazakhstan
Abay Kazakh National Pedagogical University, Almaty, Kazakhstan
Astana International University, Astana, Kazakhstan
Tomsk Polytechnic University, Tomsk, Russian Federation
Tomsk State University, Tomsk, Russian Federation
M.Kh. Dulaty Taraz Regional University
Abay Kazakh National Pedagogical University
Astana International University
Tomsk Polytechnic University
Tomsk State University
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