| 有机改性膨润土对乙草胺的吸附与控制释放作用 |
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| 引用本文： | 李建法,李益民,董华平.有机改性膨润土对乙草胺的吸附与控制释放作用[J].农药学学报,2007,9(4):390-396. |
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| 作者姓名： | 李建法 李益民 董华平 |
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| 作者单位： | 1.绍兴文理学院 化学系, 浙江 绍兴 312000 |
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| 基金项目： | 浙江省自然科学基金;浙江省绍兴市科技计划 |
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| 摘 要： | 首次尝试将十六烷基三甲基铵盐阳离子改性的有机膨润土(CTMAB-Bents)用作乙草胺的吸附剂和控制释放载体。结果表明,与原土(Na-Bent)相比,CTMAB-Bents对乙草胺的吸附能力提高3~5倍,且吸附能力与改性膨润土所用CTMAB量成正相关。吸附等温曲线符合Freundlich经验方程,相关系数R>0.99,吸附能力主要取决于乙草胺在水和有机膨润土间的分配作用。与Na-Bent相比,CTMAB-Bents可以显著抑制乙草胺的释放速率,对乙草胺的半数释放时间(t50)介于20CTMAB-Bent制剂的6.57 h与100CTMAB-Bent制剂的19.0 h之间,并随改性膨润土对乙草胺吸附能力的提高而延长。释放动力学曲线符合Ritger和Peppas方程,n值(0.429~0.618)接近Fickian扩散模型,说明乙草胺在有机膨润土中的释放主要受到扩散控制。
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| 关 键 词： | 乙草胺 除草剂 膨润土 控制释放 |
| 文章编号： | 1008-7303（2007）04-0390-07 |
| 收稿时间： | 2007-08-06 |
| 修稿时间： | 2007-10-18 |
Adsorption and Controlled Release of Acetochlor by Organically Modified Bentonites |
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| LI Jian-f,LI Yi-min and DONG Hua-ping.Adsorption and Controlled Release of Acetochlor by Organically Modified Bentonites[J].Chinese Journal of Pesticide Science,2007,9(4):390-396. |
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| Authors: | LI Jian-f LI Yi-min and DONG Hua-ping |
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| Institution: | 1.Department of Chemistry,Shaoxing University,Shaoxing 312000,Zhejiang Province,China |
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| Abstract: | Bentonites modified with the organic cation cetyltrimethylammonium(CTMAB-Bents) were utilized as adsorbents and controlled release carriers of acetochlor.The experimental results indicated that CTMAB-Bents provided 3~5 times higher adsorptive capacities of acetochlor than the raw bentonite(Na-Bent),and their adsorptive capacities positively related to the amount of CTMAB used in modification.The adsorption isotherms were fit to the Freundlich equation with correlation coefficients R>0.99.The adsorptive capacity mainly resulted from the partition of acetochlor between water and organo-bentonites.Compared with Na-Bent,CTMAB-Bents could apparently retard the release of acetochlor.The time taken for 50% of the acetochlor to be released(t50) ranged from 6.57 h for the 20CTMAB-Bent formulation to 19.0 h for the 100CTMAB-Bent formulation.The prolonged t50 was consistent with the increased adsorptive capacity of the bentonites.The release dynamics were fit to the Ritger and Peppas equation with n values(0.429~0.618) close to that of Fickian diffusion model,which indicated a diffusion-dominated release mechanism of acetochlor from organo-bentonites. |
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| Keywords: | acetochlor herbicide bentonite controlled release |
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