Acid-base activation of thermal power plant ash sludge and its adsorption properties towards heavy metals
Year: 2026
Type: article
Abstract: The results of a study on the sorption properties of ash-sludge materials generated during the combustion of coal and natural gas at the Takhiatash Thermal Power Plant before and after acid -alkaline activation are presented.A comprehensive analysis of the morphology, phase composition, and textural characteristics of the materials was carried out.It was established that modification promotes an increase in specific surface area, the development of a porous structure, and the growth of the number of active sites, which leads to a significant enhancement of adsorption capacity.The adsorption properties were investigated with respect to Pb²⁺ , Cu²⁺ , Ni²⁺ , and Mn²⁺ ions using the Langmuir and Dubinin-Radushkevich isotherm models.The activated samples demonstrated the highest sorption capacity toward Pb²⁺ (up to 71.94 mg/g) and Cu²⁺ (up to 52.36 mg/g), whereas the values for Ni²⁺ and Mn²⁺ were lower, which is attributed to differences in their hydration radii and complexation abilities.An increase in the characteristic adsorption energy after activation indicates enhanced interaction between the sorbents and heavy metal cations.It has been shown that acid-alkaline treatment is an effective method for improving the sorption activity of ash-sludge materials, making them promising adsorbents for wastewater purification and the rational utilization of technogenic wastes from thermal power plants
Source: PPOR
Language: English
Subfield: Water Science and Technology
Field: Environmental Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7127050452