Working Paper Article Version 1 This version is not peer-reviewed

Mixed Oxide-LDHs Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater

Version 1 : Received: 15 July 2020 / Approved: 17 July 2020 / Online: 17 July 2020 (09:14:45 CEST)

How to cite: Modrogan, C.; Căprărescu, S.; Dăncilă, M.A.; Orbuleţ, O.D.; Vasile, E. Mixed Oxide-LDHs Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater. Preprints 2020, 2020070372 Modrogan, C.; Căprărescu, S.; Dăncilă, M.A.; Orbuleţ, O.D.; Vasile, E. Mixed Oxide-LDHs Materials: Synthesis, Characterization and Efficient Application for Mn2+ Removal from Synthetic Wastewater. Preprints 2020, 2020070372

Abstract

In this study, Mg-Al and Mg-Al-Ni - layered double hydroxides (LDHs) were successfully synthesized for efficient removal of Mn2+ from synthetically wastewater. LDH adsorbents (Mg-Al and Mg-Ni-Al) were prepared by co-precipitation method. The formation of the layered double hydroxide, the adsorption of manganese on both LDH (Mg-Al and Mg-Ni-Al) were observed by XRD, SEM and EDX analysis. The various parameters such as the effect of shaking time, initial Mn2+ concentration, temperature were controlled and optimized to removal of Mn2+ from synthetic wastewater. The kinetics and adsorption isotherms for Mn2+ removal from wastewater were studied in batch mode. At temperatures of 10 °C and 20 °C the adsorption equilibrium was reached after 24 h. Adsorption isotherms of Mn2+ are well fitted by Langmuir and Freundlich isotherm equation. The adsorption capacity of Mn2+ from synthetic wastewater of 80.607 mg/kg was obtained for (Mg-Al-Ni)-LDH. It is found that the adsorption kinetics is best described by the pseudo-second order model. These results prove that LDHs can be considered as a potential material for adsorption of Mn2+ from wastewater.

Subject Areas

mixed oxide-LDHs; manganese; wastewater; adsorption kinetics

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