Chemical Activation of Lignite and Long-Flame Coal to Produce Magnetic Sorbents

• Published in: Coke and chemistry (New York, N.Y.) Vol. 65; no. 3; pp. 102 - 106
• Main Authors: Zykov, I. Yu, Ivanov, N. N., Dudnikova, Yu. N.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-03-2022; Springer Nature B.V
• Subjects: Adsorption; Aqueous solutions; Chemistry; Chemistry and Materials Science; Ferric chloride; Industrial Chemistry/Chemical Engineering; Lignite; Parameter modification; Porosity; Sorbents; phenol adsorption; composite sorbents; carbon sorbents; porosity; chemical activation; magnetic sorbents
• ISSN: 1068-364X; 1934-8398
• DOI: 10.3103/S1068364X22030085

Sorbents are produced from Barandatsk lignite by single-stage chemical activation using a mixture of ZnCl
3
and FeCl
3
and from Egozovo–Krasnoyarsk coal by two-stage chemical activation (activation by KOH followed by modification with FeCl
3
). On activation by ZnCl
3
and FeCl
3
, the pore structure develops only slightly, but the yield of extracted magnetic fraction is around 90%. In activation by KOH, the pore structure develops considerably, and is then partially degraded on modification by FeCl
3
. The yield of extracted magnetic fraction is around 30% in this case. The porosity is 1.5 times higher in two-stage activation. The adsorption of phenol from aqueous solutions on the new sorbents is investigated. The phenol adsorption may be described by the Langmuir equation (
R
2
≈ 0.99). The sorption parameters indicate effective phenol extraction by the sorbent modified with FeCl
3
.