Radiation Crosslinking of Modifying Super Absorbent (Polyacrylamide/Gelatin) Hydrogel as Fertilizers Carrier and Soil Conditioner
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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.
KeywordsRadiation crosslinking Chemical modification Super absorbent hydrogel Fertilizers carrier Soil conditioner Chlorophyll
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Conflict of interest
The authors declare that they have no conflict of interest.
- 3.Shalaby SW, Salz U (eds) (2006) Polymers for dental and orthopedic applications, chap 10. CRC Press, Boca Raton, p 316Google Scholar
- 5.Ratner BD, Hoffman AS (1996) Thin films, grafts, and coatings. Ratner BD, Hoffman AS, Schoen FJ, Lemons JE (eds) Biomaterials science, an introduction to materials in medicine. Academic Press, San Diego, p 105Google Scholar
- 9.Kamath KR, Park K (1992) Use of gamma-irradiation for the preparation of hydrogels from natural polymers. Proc Int Symp Control Release Bioact Mater 19:42Google Scholar
- 11.Eastoe JE, Leach AA (1977) In: Ward AG, Courts A (eds) The science and technology of gelatin. Academic Press, New York, p 73Google Scholar
- 22.Montesano FF, Parente A, Santamaria P, Sannino A, Serio F (2015) Biodegradable superabsorbent hydrogel increases water retention properties of growing media and plant growth. Agric Agric Sci Proced 4:451–458Google Scholar
- 40.Trenkel ME (1997) International Fertilizer Industry Association. Stratospheric Ozone. HMSO, LondonGoogle Scholar