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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of a superabsorbent slow-release fertilizer with sodium alginate and biochar
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Preparation and characterization of a superabsorbent slow-release fertilizer with sodium alginate and biochar

机译：用藻酸钠和生物炭制备及表征超吸收性缓释肥料

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A novel hydrogel was synthesized through the graft copolymerization of acrylic acid (AA) and acrylamide (AM) onto sodium alginate with ammonium persulfate as the initiator, methylene bisacrylamide as the crosslinking agent, and calcium chloride as the precipitating agent. Rapeseed meal biochar made at 300 degrees C was also used. A series of graft copolymers with various molar ratio of AA to AM was prepared. The structures of the hydrogels were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The free absorbency and rate of release were investigated. The grafting efficiency increased as the concentration of AM increased. There was a considerable percentage of nitrogen in the graft copolymers, and the release rate of nitrogen from fertilizer in soil and water decreased with increasing concentration of AM. The water retention of soil without hydrogel remained at 63 and 53.4% on the 10th and 20th days, but with the hydrogels, it was above 70% even on the last day. (C) 2017 Wiley Periodicals, Inc.
机译：通过将丙烯酸（AA）和丙烯酰胺（AM）的接枝共聚合成了一种新的水凝胶，在藻酸钠中用铵用铵作为引发剂，亚甲基双丙烯酰胺作为交联剂，以及作为沉淀剂的氯化钙。还使用了300℃的菜籽粕生物炭。制备具有各种摩尔比的接枝共聚物AA〜Am。通过傅里叶变换红外光谱和扫描电子显微镜的特征在于水凝胶的结构。研究了自由吸收和释放速率。随着浓度的增加，移植效率增加。接枝共聚物中存在相当大的氮氮，并随着浓度的浓度增加，土壤和水肥料中的氮气释放速率降低。 10日和第20天，没有水凝胶的土壤水保留仍保持在63和53.4％，但随着水凝胶，即使在最后一天，它均高于70％以上。 （c）2017 Wiley期刊，Inc。

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