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Structural functionalization of industrial softwood kraft lignin for simple dip-coating of urea as highly efficient nitrogen fertilizer
KTH. Research Institutes of Sweden RISE, Drottning Kristinas väg 61, 11486 Stockholm, Sweden.
KTH. Research Institutes of Sweden RISE, Drottning Kristinas väg 61, 11486 Stockholm, Sweden.
KTH.
2017 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 109, 255-265 p.Article in journal (Refereed) Published
Abstract [en]

Urea coating was conducted using polylactic acid (PLA) blended with industrial softwood kraft lignin after applying a dip-coating technique. The lignin was pre-functionalized via esterification that increased coat layer hydrophobicity or via amination that created an organically bound nitrogen structure. The PLA film reference had many pores, while the film from the PLA-lignin derivative complex was highly homogeneous and had no pores. The coat thickness was generally adjustable by repeating the coating process reaching up to 81% weight against the urea core. After coating, urea release in water was largely delayed, 20-30 and 6-10 times as long as that of uncoated urea or PLA-coated urea respectively. The coated urea will be a highly effective nitrogen fertilizer due to the controlled release after coating, the slow release from the organically bound nitrogen structure, and the expectedly extra stability against urease hydrolysis and microorganism nitrification after using the lignin structure.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 109, 255-265 p.
Keyword [en]
Lignin, Esterification, Mannich reaction, Dip coating, Nitrogen fertilizer
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-217719DOI: 10.1016/j.indcrop.2017.08.011ISI: 000413880300033Scopus ID: 2-s2.0-85028514962OAI: oai:DiVA.org:kth-217719DiVA: diva2:1159678
Note

QC 20171123

Available from: 2017-11-23 Created: 2017-11-23 Last updated: 2017-11-23Bibliographically approved

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Li, JiebingWang, Miao

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