Designing a technique for the induction movement of nanoparticles for the extraction and measurement of cadmium (II), mercury (III), and lead (II) in environmental samples using alumina modified with chitosan.

Contamination of water environments with heavy metals and dyes as a result of industrial wastewater discharge is one of the most serious environmental problems. In this research, nano-alumina coated with chitosan was used to remove heavy metal cations of cadmium (II), mercury (III), and lead (II) from water and industrial wastewater samples. The dynamic method was used to remove the pollutants and the effect of the sample, the flow rates of the samples and absorbent detergent, and the type of absorbent detergent for recovery were studied. Since alumina nanoparticles are considered one of the most important pollutant absorbers, the placement of chitosan on its surface increases efficiency due to the formation of a complex with metal ions. In this research, alumina nanoparticles modified with chitosan, which are non-magnetic adsorbents, have been used, and when placed in a strong high-frequency magnetic field, they instantly become magnetic and return to their original state. With this action, in industrial application, the wastage of nano adsorbent is prevented and high efficiency is obtained. Synthetic nanoparticles were examined by SEM, FTIR, and XRD methods. The maximum absorption of pollutants at pH = 6, amount of adsorbent 0.03 g, speed of passing the solution through the column 5 ml/min, nitric acid 2 M as eluent, solution volume 150 mL as the optimal volume for pre-concentration and flow rate 4 ml/min for The detergent was obtained. The adsorption capacity of nano alumina modified with chitosan for cadmium, mercury, and lead ions was obtained as 4.91, 4.73, and 4.15 mg/g, respectively. In this project, a flame atomic absorption spectrometer was used to measure the number of metal ions before and after the removal process. The obtained data showed that the proposed method successfully removes target heavy metals in industrial wastewater samples.