In this study, free radical copolymerization was used to prepare a hydrogel of poly (acrylic acid-co-2-amine -5-(3,5-dinitrophenyl)-1,3,4-thiadiazol) (poly-AA-ANT). The poly-AA-ANT hydrogel was characterized using Fourier transform infrared spectroscopy FTIR, Thermogravimetric analysis (TGA), and scanning electron microscopy (SEM), X-ry diffraction. The swelling of poly-AA-ANT was performed by using two solvents (water and methanol) each alone and found that the swelling ability in methanol was higher than for water. The removal of Ni2+ was conducted by immersing the poly-AA-ANT in a solution of Ni2+ and after a periol of time the residual we measured by atomic absorption spectrophotometer. The percentage of removal was 93.8%. The poly-AA-ANT hydrogel had a high swelling ratio of 546%. penetration rate of the poly-AA-ANT hydrogel coupled with the high swelling rate exposed to the internal adsorption sites. The high-water holding capacity of Poly-AA-ANT improved the moisture holding limit of soil for irrigation up to 24 days. systems as a result, Poly-AA-ANT has become an important addition to irrigation systems.
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