Sorption properties of coal-mineral sorbent based on rice husk in relation to heavy metal ions
Abstract
A new coal-mineral sorbent from rice husk was obtained. Its structure, surface and porosity were investigated. A significant amount of silicon dioxide was found in the resulting sorbent. Sorption of ions of
toxic metals from aqueous solutions by this sorbent was studied. The values of the limit of the sorption a~,
constants the sorption equilibrium k, the thermodynamic potentials of adsorption (change in enthalpy ΔH°
and entropy ΔS°, and free energy ΔG°). Experimental data on sorption treated in the framework of the model
of Langmuir. On the surface of the sorbent carboxyl groups -СООН, alcoholic and phenolic hydroxyl -OH,
silanol -Si-OH groups were found, which act as active sorption centers. Si-O-Si bonds were detected in the
sorbent; the presence of Si-OH and Si-H bonds was also revealed. The IR spectroscopy method showed the
absence in the samples obtained after sorption of the formation of pronounced silicate bonds Si–O–M (M =
Fe, Cu, Zn). At the same time, it was found that sorption of metal ions occurs at the anionic centers of the
sorbent according to the ion exchange mechanism. The results of the studies showed that the resulting sorbent effectively extracts heavy metal ions from various aqueous solutions. In general, the sorbent obtained on the basis of rice husk can be very promising, since it is cheap and has a sufficiently high sorption capacity. The material of this article may be of interest to specialists working in the field of theory and practice of adsorption phenomena and processes
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