i. mobasherpour

The presence of toluene in industrial effluents is one of the most dangerous environmental pollutants, which is considered one of the factors that destroy the environment. There are several methods for removing toluene from aqueous solutions. One of the methods to remove toluene from aqueous solutions is adsorption. In recent years, magnetic hydroxyapatite has been proposed as an adsorbent for the separation of pollutants in aqueous solutions, due to its magnetic separation properties and the possibility of reuse. In this research, magnetic hydroxyapatite was synthesized using co-precipitation method and then toluene adsorption was investigated using magnetic hydroxyapatite nanoparticles. The structure and phase analysis of the synthesized nano-adsorbent were investigated using scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. An UV spectrophotometer was used to investigate the change in toluene concentration, and a scanning electron microscope and X-ray diffraction spectroscopy were used to investigate the microstructure and chemical composition before and after toluene adsorption. In this research, with using magnetic hydroxyapatite nanoparticles, the highest percentage of toluene removal and the highest adsorption capacity was 6.75% and 980 mg/g, respectively. The results showed that the synthesized magnetic hydroxyapatite nanoparticles have the ability to adsorb toluene from aqueous solutions and can be introduced as an adsorbent of this organic compound.

Nanocrystalline Magnetic Hydroxyapatite (MHAp) was synthesized through co-precipitation method and the subsequent heat treatment. Phase analysis, particle morphology, chemical bonding, and magnetic properties were studied using XRD, FESEM, FTIR, and VSM, respectively. The XRD results showed that MHAp was formed by heat treatment at 1100 °C. The samples heat-treated at 500 and 1100 °C incorporated a plate-like morphology with a mean crystallite size of 11.7 and 59.9 nm, respectively. In addition, the VSM results indicated that the synthesized MHAp was characterized by magnetic features after heat treatment. According to the findings in this study, the coercive field (Hc), saturation magnetization (Ms), and magnetism stayed (Mr) were 0.175 kOe, 0.00147, and 0.02615 emug-1, respectively, in -10 to 10 kOe  magnetic field. The growth kinetics of the MHAp was alo studied. According to the results, the growth activation energies for low and high temperatures were 45.51 and 67.33 kJ/mol, respectively. Owing to several properties already proven, the MHAp powder was successfully synthesized.