Abstract
Background: Phosphorus is an indispensable element for the growth of animals and plants. There are several environmental problems related to phosphate; therefore, the technical and economic methods of removing phosphate are of great importance. This study evaluated the efficiency of polyaniline/ Ni0.5Zn0.5Fe2O4 magnetic nanocomposite in removing phosphate from aqueous environments. Methods: The adsorbent was characterized by several methods, including X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), and Fourier transform infrared (FT-IR) spectroscopy. Then, the potential of the adsorbentto adsorb phosphate was investigated. The effects of the parameters of contact time (5-60 minutes), pH (3-9), adsorbent dosage (0.05-0.6 g), and initial phosphate concentration (2-100 mg/L) on the phosphate removal yield were studied. All phosphate ion concentrations were measured using the ammonium molybdate spectrophotometric method. Results: The results showed that a time of 30 minutes, pH of 5, and adsorbent dose of 0.4 g were the optimum conditions for phosphate removal through adsorption. Increasing the initial concentration of phosphate from 2 to 100 mg/L decreased the removal efficiency from 90.3% to 32%. The experimental data was fitted well with the Freundlich isotherm model (R2 = 0.997). Conclusion: Polyaniline/Ni0.5Zn0.5Fe2O4 magnetic nanocomposite removes phosphate from aqueous solutions with a simple and environmentally benign procedure. The maximum adsorption capacity based on Langmuir isotherm (R2 = 0.931) is 85.4 mg/g. This magnetic nanocomposite is applicable in managing water resource pollution caused by phosphate ions.
Highlights
Adsorption has been established as an important and economically practical treatment technology for removing phosphate ions from water and wastewater
This study investigated the capability of Ni0.5Zn0.5Fe2O4 magnetic nanoparticles that were surface-modified with polyaniline (PANI) and used a polyaromatic amine as an effective adsorbent for removing phosphate from aqueous solutions (Figure 1)
Ni0.5Zn0.5Fe2O4/PANI nanocrystallites were specified by Fourier transform infrared (FT-IR) spectroscopy (Figure 3), X-ray diffraction (XRD) (Figure 4), scanning electron microscopy (SEM) (Figure 5), and vibrating sample magnetometer (VSM) (Figure 6)
Summary
Adsorption has been established as an important and economically practical treatment technology for removing phosphate ions from water and wastewater. Many efforts have been made to develop other adsorbents that are effective and inexpensive They can be produced from a wide variety of raw materials which are abundant and have high carbon and low inorganic content. Use of magnetic adsorbents is one of the most efficient, technical, and economic methods of treating wastewater. This study evaluated the efficiency of polyaniline/ Ni0.5Zn0.5Fe2O4 magnetic nanocomposite in removing phosphate from aqueous environments. Conclusion: Polyaniline/Ni0.5Zn0.5Fe2O4 magnetic nanocomposite removes phosphate from aqueous solutions with a simple and environmentally benign procedure. The maximum adsorption capacity based on Langmuir isotherm (R2 = 0.931) is 85.4 mg/g This magnetic nanocomposite is applicable in managing water resource pollution caused by phosphate ions.
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