عنوان مقاله [English]
Ion exchange resins are one of the good tools with great potential to remove metal ions from water sources. The adsorption of chromium ion was investigated by modified poly (styrene-co-maleic anhydride) with 2-aminopyridine and crosslinked with 1, 2 - diamino ethane (CSMA-AP) under ultrasonic irradiation as an ion exchange resin in aqueous solutions. In this work, crosslinked resin has been synthesized by poly (styrene-co-maleic anhydride) and 1, 2 - diamino ethane. This type of ion exchange resins adsorbs metal ions due to the combination of ionic and coordination intractions, instead of simple electrostatic interactions in conventional anionic or cationic exchange. therefore, the chelating resins, exhibit better selectivity compared to conventional resins. The adsorption behavior of these metal ions on the resin was studied by varying the parameters such as pH (2-7), adsorbent dose (0.5-5 g/L), contact time (0- 180 min) and metal ions concentration (1-40 mg/L). By increasing the initial concentration of chromium ion to about 10 mg / L, Adsorption percentage after increasing was fixed and then decreased. The SEM device was also used to confirm the adsorption process. The MAP technique shows the presence of elements in the nano-sorbent structure, which, as a result of these images, qualitatively adsorption process is well verified. The results showed that the best fit was achieved with the Langmuir isotherm equations. By using these isotherms, maximum adsorption capacities of 20.619 mg/L were obtained, which indicates the high capability of these ion exchange resins for the process of adsorbing and removing chromium ion.