چكيده به لاتين
Easy synthesis of Fe3O4-HNTs-Ppy magnetic nanocomposite was done by in situ polymerization in 2 steps by magnetic deposition. Scanning electron microscopy (SEM) images show the morphology of the sample surface and the placement of magnetic nanoparticles on the halloysite nanotubes as well as the polymer coating on the surface of the nanoparticles. Infrared Fourier Transform Spectrometer (FTIR) distinguishes well-formed bonds such as polymer or Fe_O bonds.
Also for other physical characterizations of nanocomposites, vibration sample magnetometer (VSM) analyzers, X-ray energy diffraction (EDX) spectroscopy, Thermogravimetric analysis (TGA) and sample specific surface area (BET) measurements were used.
Magnetometric analysis of the vibrating sample showed that the saturation magnetization of Fe3O4 was about 65 emu / g, which by adding HNTs and Ppy to that amount of saturation magnetization reached 35 emu / g and 7 emu / g, respectively. Thermal weight analysis showed that of the two weight percent synthesized, one contained 47% and the other contained 67% of the polypyrrole polymer. Also, the temperature stability of magnetic nanosorbents is about 325 ° C and then the structure is destroyed due to evaporation of polypyrrole. Measurement of specific surface area of the sample also showed that the synthesized adsorbent is of the mesoporous type.
Studies were performed on the adsorption properties of heavy and toxic metal ions on the adsorbent due to the magnetic nature of the nanocomposite and its porous surface. Atomic absorption analysis (AAS) was used to evaluate the adsorption rate of heavy metal ions. The adsorption of copper and cadmium metal with 30 mg of adsorbent in 250 PPM solution for 60 minutes was 82.8% and 77.2%, respectively. The weight percentage of the produced samples was changed to determine the maximum amount of heavy metal adsorption of copper and cadmium. By changing the weight percentage of nanocomposite, it was found that the higher the magnetism of the adsorbent, the higher the adsorption rate. Therefore, by reducing the use of polymer or reducing the use of halloysite nanotubes that reduce the magnetic properties of the nanocomposite, the adsorption rate can be increased. Absorption and kinetic isotherms were also investigated.
Keywords: Water Pollution, Magnetic Adsorbent, Halloysite Nanotubes, Heavy metals, Absorption Isotherm
