Abstract
Although copper is needed for living organisms at low concentrations, it is one of the pollutants that should be monitored along with other heavy metals. A novel and sustainable composite mineralizing sorbent based on MgO-CaO-Al2O3-SiO2-CO2 with nanosized adsorption centers was synthesized using natural calcium–magnesium carbonates and clay aluminosilicates for copper sorption. An organometallic modifier was added as a temporary binder and a source of inovalent ions participating in the reactions of defect formation and activated sintering. The sorbent-mineralizer samples of specified composition and properties showed irreversible sorption of Cu2+ ions by the ion exchange reactions Ca2+ ↔ Cu2+ and Mg2+ ↔ Cu2+. The topochemical reactions of the ion exchange 2OH− → CO32−, 2OH− → SO42− and CO32− → SO42− occurred at the surface with formation of the mixed calcium–copper carbonates and sulfates structurally connected with aluminosilicate matrix. The reverse migration of ions to the environment is blocked by the subsequent mineralization of the newly formed interconnected aluminosilicate and carbonate structures.
Highlights
Introduction distributed under the terms andHeavy metals are major pollutants that must be monitored in all countries [1]
Thereby, the objectives of present work were to: synthesize a mineralizing composite sorbent based on the MgO-CaO-Al2 O3 -SiO2 -CO2 system from other materials, avoiding metallurgical slag; improve sorption irreversibility by the introduction of carbonates to raw material; investigate Cu2+ sorption capacity; and provide insights into the sorption–mineralization mechanism of this system
The following components were used as reagents for sorbent synthesis: natural calcium and magnesium carbonates; natural aluminosilicate clay materials; and organometallic modifier
Summary
Heavy metals are major pollutants that must be monitored in all countries [1]. The source of pollution in water bodies is wastewater [2] from industrial enterprises of nonferrous and ferrous metallurgy, mining, machine building and chemical and automobile [3]. Issues with very specific metallurgical slag composition stimulate research to identify other raw material sources suitable for the sorbent obtaining that would significantly widen the sorbent applicability. Thereby, the objectives of present work were to: synthesize a mineralizing composite sorbent based on the MgO-CaO-Al2 O3 -SiO2 -CO2 system from other materials, avoiding metallurgical slag (i.e., natural calcium and magnesium carbonates, aluminosilicate clay materials and organometallic compound based on esters, as a modifier); improve sorption irreversibility by the introduction of carbonates to raw material; investigate Cu2+ sorption capacity; and provide insights into the sorption–mineralization mechanism of this system. In comparison with the previously obtained sorbent from metallurgical slag, the newly synthesized one contains carbonates Another characteristic feature is the application of organometallic modifier, which is simultaneously used as a temporary binder and a source of inovalent ions. The quantity of carbonates is equal to 4%–5% by weight of the adsorbent
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
