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Green synthesis of a novel eco-friendly hydrochar from Pomegranate peels loaded with iron nanoparticles for the removal of copper ions and methylene blue from aqueous solutions

2022; Elsevier BV; Volume: 368; Linguagem: Inglês

10.1016/j.molliq.2022.120722

1873-3166

Gasser M. Khairy, Ahmed Hesham, Hossam Elden S Jahin, Sabry A. El‐Korashy, Yasser M. Awad,

Nanomaterials for catalytic reactions

This study developed a novel eco-friendly and cost-effective bioadsorbent by synthesizing iron nanoparticles loaded onto hydrochar ([email protected]). Pomegranate peels were used as feedstock for hydrochar (HC) production. The production of [email protected] was done by hydrothermal carbonization process using the black solution of iron nanoparticles as a hydrothermal carbonization media. The [email protected] was characterized using FTIR, Transmission electron microscope (TEM), Zeta potential techniques, X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area, SEM with EDX analysis, and Thermal analysis. The mean particle size of FeNPs and HC were ∼28 and 196 nm, respectively. The batch experiments like initial concentration, contact time, solution temperature, adsorbent dosage, and pH on the adsorption capacity of the bioadsorbent for Cu (II) and MB were examined and determined. Maximum sorption capacity (qm) of Cu (II) and MB was 95.24 and 278 mg g−1. Different adsorption isotherms and kinetics models have been used for evaluating the adsorption process. The R2 value obtained by Langmuir isotherm was the highest for Cu(II) = 0.997, while the R2 value obtained by Freundlich isotherm is the highest for MB = 0.9957. The thermodynamic parameters have been determined for the adsorption process. The ΔG0 values are negative, referring to the adsorption processes being spontaneous. The reusability of [email protected] for removal Cu(II) and MB has been tested in four cycles and showed a good removal efficiency. The [email protected] was successfully applied to actual wastewater samples.