草甘膦插层镁铝水滑石MgAl-LDH-gly的释放性能研究

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (10): 1869.

草甘膦插层镁铝水滑石MgAl-LDH-gly的释放性能研究

张娴, 张慧, 卫敏, D.G.Evans, 段雪

北京化工大学可控化学反应科学与技术基础教育部重点实验室, 北京100029

收稿日期:2004-01-12 出版日期:2004-10-24 发布日期:2004-10-24
基金资助:
国家自然科学基金(批准号:20106002);国家“八六三”计划项目(批准号:2001AA327120)资助

Release Properties of Glyphosate from a Supramolecular Glyphosate Intercalated MgAl-LDH

ZHANG Xian, ZHANG Hui, WEI Min, Evans D. G., DUAN Xue

Key Laboratory of Science and Technology of Controllable Chemical Reactions of Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China

Received:2004-01-12 Online:2004-10-24 Published:2004-10-24

摘要/Abstract

摘要： 采用成核/晶化隔离法将草甘膦(Glyphosate:gly)插层组装到镁铝水滑石层间,制得草甘膦插层镁铝水滑石(MgAl-LDH-gly).在水和碳酸钠溶液中考察了gly的释放性能,初步探讨了MgAl-LDH-gly在这两种溶液中的释放机理,认为其释放机理主要为离子交换,释放速率较大的初期符合一级动力学过程.用磷酸缓冲溶液考察环境pH值对MgAl-LDH-gly释放的影响,证明弱碱性(pH=7.6)和偏中性(pH=6.6)环境有利于其释放;探讨混合无机阴离子溶液中无机阴离子对MgAl-LDH-gly释放性能的影响,结果表明,MgAl-LDH-gly的释放速率及释出量在所考察范围内由溶液中无机阴离子的总浓度决定.

关键词: 水滑石, 草甘膦, 缓释除草剂, 释放性能

Abstract: Glyphosate intercalated magnesium aluminum layered double hydroxides (MgAl-LDH-gly), a novel controlled-releasing herbicide formulation, was synthesized by using a new method involving separate nucleation and aging steps developed in our lab, and characterized by XRD and IR spectroscopy. First of all, the release property of MgAl-LDH-gly was studied in pure H₂O and Na₂CO₃ solution, respectively. Furthermore, its release behavior was studied in phosphate buffer solutions with different pH values and in mixed inorganic anions solution in order to investigate the influence of environmental factors. The results indicate that the release of MgAl-LDH-gly is actually an anions exchange process, and the primitive release process accords with the first-order kinetics equation. It is shown that MgAl-LDH-gly can be used more effectively in weak alkali or neutral environment than in weak acid environment. The quantity of released gly is decided by the whole concentration of inorganic anions in solution in our experimental range.

Key words: Layered double hydroxide, Glyphosate, Controlled-releasing herbicide, Release properties

中图分类号:

O646.2

TrendMD:

张娴, 张慧, 卫敏, D.G.Evans, 段雪. 草甘膦插层镁铝水滑石MgAl-LDH-gly的释放性能研究. 高等学校化学学报, 2004, 25(10): 1869.

ZHANG Xian, ZHANG Hui, WEI Min, Evans D. G., DUAN Xue . Release Properties of Glyphosate from a Supramolecular Glyphosate Intercalated MgAl-LDH. Chem. J. Chinese Universities, 2004, 25(10): 1869.

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