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首页> 外文期刊>Chemical engineering journal >Slow-release nitrogen and boron fertilizer from a functional superabsorbent formulation based on wheat straw and attapulgite
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Slow-release nitrogen and boron fertilizer from a functional superabsorbent formulation based on wheat straw and attapulgite

机译：基于小麦秸秆和凹凸棒石的功能性高吸收剂缓释氮硼肥

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摘要

To improve fertilizer use efficiency and minimize its negative impact on environment, a slow-release nitrogen and boron fertilizer with water-retention was prepared. Wheat straw was used as skeletal material in copolymerization on which acrylic acid monomer can be grafted to form superabsorbent composite. Urea and borax were introduced to provide nitrogen (N) and boron (B) nutrients, respectively. The product possessed a core/shell structure. Its core was urea in attapulgite and alginate matrix, and the shell was chemically modified wheat straw-g-poly(acrylic acid)/attapulgite (CMWS-g-PAA/APT) superabsorbent composite containing urea and borax. The effects of the amount of cross-linker, initiator, chemically modified wheat straw and attapulgite on water absorbency were investigated and optimized. The water absorbency of superabsorbent synthesized under optimal conditions was 186g g~(-1) in tap water. Ammonia-selective electrode and inductively coupled plasma results showed that the contents of the nitrogen and boron of the product were 23.3% and 0.65%, respectively. The water retention capacity and the slow-release behavior of N and B of the product were investigated. The results showed that the product with slow-release and water-retention capacity, being economical, nontoxic in soil and environment-friendly, could be found good application in agriculture and horticultural.
机译：为了提高肥料使用效率并最大程度地减少其对环境的不利影响，制备了一种保水的缓释氮和硼肥料。麦草被用作共聚中的骨架材料，丙烯酸单体可以接枝形成超吸收性复合材料。引入尿素和硼砂分别提供氮（N）和硼（B）养分。该产品具有核/壳结构。它的核心是凹凸棒石和藻酸盐基质中的尿素，外壳是含有尿素和硼砂的化学改性小麦秸秆-g-聚（丙烯酸）/凹凸棒石（CMWS-g-PAA / APT）高吸收性复合材料。研究并优化了交联剂，引发剂，化学改性的麦秸和凹凸棒石的用量对吸水率的影响。在最佳条件下合成的超吸收剂在自来水中的吸水率为186g g〜（-1）。氨选择电极和电感耦合等离子体的结果表明，产物中氮和硼的含量分别为23.3％和0.65％。研究了产品的保水能力以及氮和硼的缓释行为。结果表明，该产品具有缓释和保水功能，经济，对土壤无毒且对环境友好，可在农业和园艺中得到很好的应用。

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