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This study aimed to synthesize nanosized Mg0.2Fe2.8O4/AC/TiO2 composite for removal Pb(II) from water. The crystal structure and functional group of the sample were evaluated using XRD and FTIR spectroscopy. The morphology and band gap energy of the sample were characterized by means of SEM and UV-Vis spectroscopy. Meanwhile, the absorbance performance of the composite for removal Pb(II) was evaluated using AAS characterization. The results of the data analysis in this study showed that the Mg0.2Fe2.8O4/AC/TiO2 composite was successfully synthesized using coprecipitation method. The result of the XRD characterization presented the two phases for Mg0.2Fe2.8O4 and TiO2. The FTIR characterization results showed that the composite had a Fe-O bond at the tetrahedral and octahedral positions that were detected in the wavenumber range of 800–500 cm−1. The SEM image showed that the morphology of composite tended to agglomerate with a particle size distribution of 44.3 nm. The band gap energy resulting from the UV-Vis data analysis was 3.492 eV. Interestingly, the absorption efficiency for removal Pb(II) of the Mg0.2Fe2.8O4/AC/TiO2 composite reached 99.08%–99.90%. [ABSTRACT FROM AUTHOR]

This paper reports the synthesis of Mn0.25Fe2.75O4/r-GO nanocomposite from iron sand and corncob using the co-precipitation method with an Mn doping molar fraction of 0.25. The prepared sample was characterized by XRD, FTIR, and SEM-EDX to investigate the structure, functional groups, and morphology of the nanocomposite. The diffraction pattern showed that the nanocomposite constructed a crystalline phase of Mn0.25Fe2.75O4/r-GO and amorphous r-GO. The results of FTIR characterization on nanocomposite exhibited those functional groups representing the existence of Mn and Fe-O at 418–480 cm-1 and C=C at 1629 cm-1. According to the results of SEM characterization, the samples had spherical and sheets shape. All samples tended to agglomerate with a distribution particle size around 26–31 nm. Furthermore, the EDX characterization results showed the presence of Fe, Mn, O, and C. [ABSTRACT FROM AUTHOR]