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Removal of Cu2+ metal ions from water using Mg-Fe layered double hydroxide and Mg-Fe LDH/5-(3-nitrophenyllazo)-6-aminouracil nanocomposite for enhancing adsorption properties

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Abstract

Herein, a new adsorbent was prepared by modifying Mg-Fe LDH for the removal of Cu2+ metal ions from wastewater. Mg-Fe LDH with 5-(3-nitrophenyllazo)-6-aminouracil ligand has been successfully prepared using direct co-precipitation methods and was fully characterized using FTIR analysis, X-ray diffraction, BET surface area theory, zeta potential, partial size, TGA/DTA, CHN, EDX, FESEM, and HRTEM. The surface areas of Mg-Fe LDH and Mg-Fe LDH/ligand were 73.9 m2/g and 34.7 m2/g respectively. Moreover, Cu2+ adsorption on LDH surfaces was intensively examined by adjusting different parameters like time, adsorbent dosage, pH, and Cu2+ metal ion concentration. Several isotherm and kinetic models were investigated to understand the mechanism of adsorption towards Cu2+ metal ions. Adsorption capacity values of LDH and ligand-LDH rounded about 165 and 425 mg/g respectively, applying nonlinear fitting of Freundlich and Langmuir isotherm equations showing that the ligand-LDH can be considered a potential material to produce efficient adsorbent for removal of heavy metal from polluted water. The adsorption of Cu2+ metal ions followed a mixed 1,2-order mechanism. The isoelectric point (PZC) of the prepared sample was investigated and discussed. The effect of coexisting cations on the removal efficiency of Cu2+ ions shows a minor decrease in the adsorption efficiency. Recyclability and chemical stability of these adsorbents show that using Mg-Fe LDH/ligand has an efficiency removal for Cu2+ ions higher than Mg-Fe LDH through seven adsorption/desorption cycles. Moreover, the recycling of the Cu2+ ions was tested using cyclic voltammetry technique from a neutral medium, and the Cu2+ ion recovery was 68%.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Beni-Suef University, Beni-Suef, 62511, Egypt

    Hanna Awes, Zinat Zaki, Safa Abbas, Samah A. Abd-El Moaty & Rehab K. Mahmoud

  2. Chemistry Department, Faculty of Science, Benha University, Benha, Egypt

    Hassan Dessoukii

  3. Department of Environmental Science and Industrial Development, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef, 62511, Egypt

    Amal Zaher & Nabila Shehata

  4. Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University, Beni-Suef, Egypt

    Ahmed Farghali

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  1. Hanna Awes
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  2. Zinat Zaki
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  4. Hassan Dessoukii
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Contributions

Dr. Rehab K. Mahmoud and Zinat Zaki conceived the idea for water treatment application; participated in study design, interpretation, and data analysis of treatment application; and wrote and revised the manuscript by Prof. Dr. Hassan Dessoukii. Hanna Awes and Safa Abbas prepared the mentioned nanomaterials. S.A. Abd El Moaty and Amal Zaher wrote aforementioned characterizations of the prepared nanomaterials. Amal Zaher, Nabila Shehata, and Ahmed Farghali performed the water remediation from cupper metal ion studies.

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Correspondence to Amal Zaher.

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Awes, H., Zaki, Z., Abbas, S. et al. Removal of Cu2+ metal ions from water using Mg-Fe layered double hydroxide and Mg-Fe LDH/5-(3-nitrophenyllazo)-6-aminouracil nanocomposite for enhancing adsorption properties. Environ Sci Pollut Res 28, 47651–47667 (2021). https://doi.org/10.1007/s11356-021-13685-0

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