Abstract
AbstractA novel hydrogel slow-release nitrogen fertilizer based on sawdust with water absorbency was prepared using grafting copolymerization. Urea was incorporated as nitrogen source in a hydrogel fertilizer. Potassium persulfate (KPS) and N,N᾽-methylenebis acrylamide (MBA) were used as the initiator and cross-linker, respectively. The structure and properties of the samples were characterized by XPS, EDS, SEM, XRD and FTIR. The effects of various salt solutions, ionic strength and pH on swelling behavior were discussed. The results showed that the largest water absorbency of the sample reached 210 g/g in distilled water. In addition, the sample had the good nitrogen release property. Thus, the novel environmentally friendly hydrogel fertilizer may be widely applied to agricultural and horticultural fields.
Highlights
The peaks at 1386 and 1039 cm−1 were attributed to C–C and C–O–C stretching vibration
There was a peak at 1434 cm−1, which was assigned to symmetric stretching vibration of –COO− groups [33,34]
The peaks at 1678 and 562 cm−1 were ascribed to the stretching vibration of –C=O in –CONH2 and bending vibration of N–CO–N, respectively
Summary
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