Understanding the adsorption mechanism of Ag+ and Hg2+ on functionalized layered double hydroxide via statistical physics modeling
Source abstract
Abstract
Abstract Modeling analysis based on a statistical physics theory was used to explain the adsorption of Ag+ and Hg2+ on layered double hydroxides (LDH) functionalized with anions CO32−, NO3−, S52− and MoS42−. Theoretical adsorption models assuming different types of functional groups on LDH surface were tested and compared. A statistical physics model based on two active sites for the adsorbate binding was the best option to characterize and interpret the removal of investigated heavy metals on LDH. Modeling results showed that the total adsorption capacities at saturation ranged from 112 to 631 mg/g and from 110 to 638 mg/g for Ag+ and Hg2+, respectively. LDH functionalized with anion MoS42− was the best adsorbent for the removal of both metal ions. It was also demonstrated that the anionic functionalities and the oxygen-containing groups of LDH contributed in different extent for the adsorption of Ag+ and Hg2+. Statistical physics parameters suggested a multi-ionic and endothermic adsorption caused by physical and chemical interactions. Finally, the adsorption mechanism was macroscopically explained via the calculation and analysis of thermodynamic potentials.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Layered Double Hydroxides Synthesis and Applications · Adsorption and biosorption for pollutant removal · Covalent Organic Framework Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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