چكيده لاتين
In this research, the compound ethylenediamine-N,N-bis(2-hydroxyphenylacetic acid) (EDDHA) was synthesized and its structure was identified by nuclear magnetic resonance spectroscopy (1HNMR). Then the composition of FeEDDHA was prepared and its structure was identified and confirmed by UV-Vis spectroscopy. After that, a composite based on humic acid, carboxymethyl cellulose and itaconic acid (HCI) was prepared and its structure was identified by Fourier transform infrared spectroscopy (FT-IR). Then, a new superabsorbent hydrogel, compatible with the environment, degradable and with high water absorption capacity was prepared based on humic acid, carboxymethyl cellulose, itaconic acid and acrylic acid by radical polymerization method in water solvent. Structure and morphology of synthesized superabsorbent using Fourier transform infrared spectroscopy (FT-IR), imaging by scanning electron microscope (SEM), rheology test (RMS), thermal analysis (TGA) and Zeta potential analysis) was investigated. After the synthesis of superabsorbent, the effects of various factors on water absorption including the amount of ammonium persulfate initiator, the amount of N,N-methylene bis-acrylamide crosslinker, the amount of acrylic acid monomer, the percentage of acrylic acid neutralization by sodium hydroxide base, the type and concentration of salt solution, urban water and solution pH were discussed. Finally, a superabsorbent with the ability to absorb 1240 g/g in distilled water, 148 g/g in city water and 265 g/g in 9 g/L sodium chloride saline solution was prepared. Then FeEDDHA chelated fertilizer was added to the superabsorbent and the slow release of the fertilizer from the superabsorbent was investigated in distilled water and soil. The results showed that the water retention capacity in the soil containing superabsorbent is more than the soil without superabsorbent, and the prepared superabsorbent will be useful in modern agriculture due to the characteristics of slow release of water and fertilizer.
