文献类型：期刊文献

中文题名：纤维素及其复合凝胶对除草剂的控制释放作用

英文题名：Controlled Release of Herbicide from Cellulose and Its Composite Gels

作者：姜曼[1];吴环[1];李建法[1];徐娇姣[1];俞晶晶[1];朱虹[1]

机构：[1]绍兴文理学院化学系

年份：2009

卷号：8

期号：4

起止页码：19

中文期刊名：现代农药

外文期刊名：Modern Agrochemicals

收录：CSTPCD

基金：浙江省新苗人才计划项目(2008R40G2180012);浙江省自然科学基金资助项目(Y307106)

语种：中文

中文关键词：纤维素;膨润土;除草剂;控制释放

外文关键词：cellulose; bentonite; herbicide; controlled release

中文摘要：经Al3+交联得到的羧甲基纤维素(CMC)凝胶用于包载除草剂2,4-滴,以控制其释放速度,延长药效,减轻农药污染。在CMC凝胶制剂中加入改性膨润土可以进一步延缓2,4-滴的释放,其50%释放量所需时间(t50)由9.18h延长到16.0h。不同种类的膨润土在复合凝胶制剂中的作用效果与其对2,4-滴的吸附性能密切有关,吸附性能越强,控制除草剂释放的效果越好。释放动力学分析表明,2,4-滴由凝胶制剂中的释放主要受到扩散控制。

外文摘要：The gel carders obtained by crosslinking of carboxymethyl cellulose with Al^3＋ were used to encapsulate herbicide 2,4-D, so as to control its release rate, prolong its action time and reduce the pesticide pollution. The release of 2,4-D was further slowed by incorporating modified bentonites into the CMC gel formulation, with the time taken for 50% of herbicide to be released （t50） prolonged from 9.18 h to 16.0 h. The performance of various bentonites in the composite gel formulations was closely related to their adsorption to 2,4-D. The bentonite having higher adsorption capacity performed better on controlling the release of herbicide. It was concluded that the release of 2,4-D from the gel formulations was dominated by a Fickcian diffusion by analyzing the release data with an experiential model.