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Chloride sorption of nano-SiO2@MgAl-layered double hydroxides core-shell nanocomposite in simulated concrete pore solution: Equilibrium, thermodynamic and kinetic studies
Abstract Nano-SiO2@MgAl-layered double hydroxides (NS@MgAl-LDH) core-shell nano-composites were successfully synthesized by a co-precipitation method. The as-synthesized NS@MgAl-LDH was characterized by SEM, TEM, EDX, TGA and BET. The equilibrium, thermodynamic and kinetic studies on the chloride sorption of NS@MgAl-LDH were performed in simulated concrete pore solution (SCPS). The results show that NS@MgAl-LDH exhibits a higher specific surface area (SSA) compared to MgAl-LDH. Besides, the chloride sorption capacity of NS@MgAl-LDH is significantly higher than that of pure MgAl-LDH, which is obviously influenced by initial pH-value and amount of adsorbents addition. Also, the chloride sorption process can be fitted by the Langmuir-model thermodynamically and the pseudo-second-order kinetics kinetically. The negative values of Gibbs-free energy (ΔG0) and standard enthalpy change (ΔH0) indicate that the chloride sorption is spontaneous and exothermic. Furthermore, the outstanding chloride sorption capacity of NS@MgAl-LDH is mainly contributed to the ion-exchange of chloride ions with interlayer ions in the highly dispersed MgAl-LDH.
Highlights The NS@Mg-Al LDHs has been successfully synthesized. The NS@Mg-Al LDHs exhibits a higher Cl− binding capacity. The sorption processes can be better fitted by Langmuir-model. The sorption processes are controlled by pseudo-second-order. The sorption processes are spontaneous and exothermic in nature.
Chloride sorption of nano-SiO2@MgAl-layered double hydroxides core-shell nanocomposite in simulated concrete pore solution: Equilibrium, thermodynamic and kinetic studies
Abstract Nano-SiO2@MgAl-layered double hydroxides (NS@MgAl-LDH) core-shell nano-composites were successfully synthesized by a co-precipitation method. The as-synthesized NS@MgAl-LDH was characterized by SEM, TEM, EDX, TGA and BET. The equilibrium, thermodynamic and kinetic studies on the chloride sorption of NS@MgAl-LDH were performed in simulated concrete pore solution (SCPS). The results show that NS@MgAl-LDH exhibits a higher specific surface area (SSA) compared to MgAl-LDH. Besides, the chloride sorption capacity of NS@MgAl-LDH is significantly higher than that of pure MgAl-LDH, which is obviously influenced by initial pH-value and amount of adsorbents addition. Also, the chloride sorption process can be fitted by the Langmuir-model thermodynamically and the pseudo-second-order kinetics kinetically. The negative values of Gibbs-free energy (ΔG0) and standard enthalpy change (ΔH0) indicate that the chloride sorption is spontaneous and exothermic. Furthermore, the outstanding chloride sorption capacity of NS@MgAl-LDH is mainly contributed to the ion-exchange of chloride ions with interlayer ions in the highly dispersed MgAl-LDH.
Highlights The NS@Mg-Al LDHs has been successfully synthesized. The NS@Mg-Al LDHs exhibits a higher Cl− binding capacity. The sorption processes can be better fitted by Langmuir-model. The sorption processes are controlled by pseudo-second-order. The sorption processes are spontaneous and exothermic in nature.
Chloride sorption of nano-SiO2@MgAl-layered double hydroxides core-shell nanocomposite in simulated concrete pore solution: Equilibrium, thermodynamic and kinetic studies
Zhou, Peng (Autor:in) / Xu, Jinxia (Autor:in) / Wang, Zihao (Autor:in)
Applied Clay Science ; 240
05.05.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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