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首页> 外文期刊>Journal of Polymers and the Environment >Effect of Modified Lignin Sulfonate on Controlled-Release Urea in Soil
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Effect of Modified Lignin Sulfonate on Controlled-Release Urea in Soil

机译：改性木质素磺酸盐对土壤控释尿素的影响

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摘要

The present study reports an economically attractive improvement in fertilizer, using lignin sulfonate as a waste product in the pulp and paper manufacturing process. Lignin sulfonate was extracted by precipitation with calcium hydroxide. To achieve hydrophobicity, some modifiers were tested, and oxalic acid successfully met the required purpose. FTIR analysis indicated the changes in the functional groups of acetylated lignin. Then, lignin sulfonate acetylated with oxalic acid was coated on urea through a fluidized bed column. The released amount of different concentrations of fertilizer in water and soil was measured. Sulfur-coated urea fertilizer was used to compare with the product. The results showed that acetylated lignin sulfonate coated urea could properly control urea release. The amount of released acetylated lignin sulfonate coated urea after 18 days was 79 %, while for sulfur-coated urea, 93 % was released after 11 days. To add, the power model could predict the release pattern of acetylated lignin sulfonate coated urea accurately.
机译：本研究报告了在木浆和造纸过程中使用木质素磺酸盐作为废品的肥料在经济上有吸引力的改进。通过用氢氧化钙沉淀来提取木质素磺酸盐。为了获得疏水性，测试了一些改性剂，草酸成功达到了所需目的。 FTIR分析表明乙酰化木质素的官能团的变化。然后，将由草酸乙酰化的木质素磺酸盐通过流化床柱涂覆在尿素上。测量了水和土壤中不同浓度肥料的释放量。使用硫包衣尿素肥料与产品进行比较。结果表明，乙酰化木质素磺酸盐包被的尿素可以适当地控制尿素的释放。 18天后释放的乙酰化木质素磺酸盐涂覆的尿素的释放量为79％，而硫磺涂覆的尿素，在11天后释放了93％。此外，功率模型可以准确预测乙酰化木质素磺酸盐包膜尿素的释放模式。

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