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Radiation Crosslinking of Modifying Super Absorbent (Polyacrylamide/Gelatin) Hydrogel as Fertilizers Carrier and Soil Conditioner

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Abstract

A novel approach is developed for preparing a highly porous super absorbent hydrogel (SAH). Synthetic and natural hydrogel based acrylamide (Am) and gelatin (G) were polymerized and crosslinked by gamma radiation. Three hydrogels compositions have been prepared in weight ratio 1:2, 1.5:1.5 and 2:1 (wt:wt) for 30% PAAM/G and exposed to gamma radiation at dose of 30 kGy. The effect of chemical modifications on increasing the swelling power of polyacrylamide gelatin (PAAM/G) has been evaluated. The alkaline hydrolysis of PAAM/G hydrogel with concentrated NaOH converts amid groups CONH2 to carboxylic groups COONa. The modified hydrogels will take the codes PAAM-COOH/G, PAAM-COONa/G and PAAM-COOK/G that dramatically increased the degree of swelling from 220 to 720 (g/g). Furthermore, studies on the slow release ability of three kinds of fertilizer (K, P and urea) loaded on modified PAAM-COOH/G and evaluated the ability of SAH hydrogels to absorb and then gradually release water and fertilizer. A mathematical model for fertilizer release from PAAM-COOK/G was applied to calculate the diffusion coefficient D. The main aim of this article is performed the effect of soil amendment with PAAM-COOK/G on eliminating water stress was tested for bean plant (Vicia faba) irrigation cycles in drought-prone environments. The growth of bean plant was monitored by measuring the highest and size of leaves and bean seed. The effect of water stress was monitored also, by measuring the intensity of chlorophyll for both SAH and control soil. The results indicated that the chemical modification of (PAAM/G) into (PAAM-COOK/G) could greatly improve water absorbency. The experimental data indicated that the SAH has a positive effect to use as fertilizers carrier and soil conditioner.

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Authors and Affiliations

  1. Radiation Research of Polymer Department, National Center for Radiation Research and Technology (NCRRT), Atomic Energy Authority, Nasr City, P.O. Box 29, Cairo, Egypt

    Mohamed Mohamady Ghobashy

  2. Polymeric Material Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), New Borg El-Arab City, Alexandria, 21934, Egypt

    Basem Kh. El-Damhougy & Norhan Nady

  3. Chemical and Petrochemicals Department, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City, Alexandria, Egypt

    Norhan Nady

  4. Department of Chemistry, Faculty of Science, Al-Azher University, Nasr City, P.O. Box 11754, Cairo, Egypt

    H. Abd El-Wahab, A. M. Naser & Farag Abdelhai

Authors
  1. Mohamed Mohamady Ghobashy
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  2. Basem Kh. El-Damhougy
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  4. H. Abd El-Wahab
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Correspondence to Mohamed Mohamady Ghobashy.

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Ghobashy, M.M., El-Damhougy, B.K., Nady, N. et al. Radiation Crosslinking of Modifying Super Absorbent (Polyacrylamide/Gelatin) Hydrogel as Fertilizers Carrier and Soil Conditioner. J Polym Environ 26, 3981–3994 (2018). https://doi.org/10.1007/s10924-018-1273-9

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  • DOI: https://doi.org/10.1007/s10924-018-1273-9

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