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木质素/黏土复合材料对尿素分子的缓释作用(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2013年01期
Page:
91-95
Column:
研究论文
publishdate:
2013-01-15

Article Info:/Info

Title:
Slow releasing properties for urea molecules of composite materials made of lignin and clay
Author(s):
LI Wenzhuo WANG Jianlong GAO Mingxian
College of Science, Nanjing Forestry University, Nanjing 210037, China
Keywords:
lignin clay slow releasing urea leaching experiment urease activity
Classification number :
TQ325.1
DOI:
10.3969/j.issn.1000-2006.2013.01.016
Document Code:
A
Abstract:
Composite materials with the property of slowly releasing urea had been prepared by using lignin and clay as starting materials in this research. SEM pictures of lignin/clay composite material prepared showed that sphere-like assembling structure of lignin had been transferred into honeycomb assembling structure with more pores for hydrogen bonding between hydroxyl groups of both of the starting materials. Leaching experiments confirmed that the prepared lignin/clay composite materials with the porous structure owning a function of slow releasing property for urea molecules, and the weight ratio of m(lignin):m(clay):m(urea)was 2:1:4 in the composite. Also, what had been confirmed experimentally was that the addition of polyvinyl alcohol as filmogen could improve the slow releasing properties of lignin/clay composite materials for urea molecules. Water adsorption experiments showed that the lignin/clay composite materials prepared could adsorb the water in air, which was helpful for promoting dry soil to keep their water. Soil urease activity inhibition experiments showed that the prepared composite materials could reduce urease activity which could transfer urea into volatile ammonia. Specially, when copper ions were introduced into between layers of clay of composite materials, the prepared lignin/clay composite materials inhibited urease activity more seriously in soil.

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Last Update: 2013-01-15