文献类型：期刊文献

中文题名：有机改性膨润土对乙草胺的吸附与控制释放作用(英文)

英文题名：Adsorption and Controlled Release of Acetochlor by Organically Modified Bentonites

作者：李建法[1];李益民[1];董华平[1]

机构：[1]绍兴文理学院化学系

年份：2007

卷号：9

期号：4

起止页码：390

中文期刊名：农药学学报

外文期刊名：Chinese Journal of Pesticide Science

收录：CSTPCD、、CSCD2011_2012、CSCD

基金：浙江省自然科学基金资助项目(Y506288,Y307106);绍兴市科技计划项目(2006A32004)

语种：中文

中文关键词：乙草胺;除草剂;膨润土;控制释放

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

中文摘要：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6．57h与100CTMAB-Bent制剂的19．0h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。

外文摘要：Bentonites modified with the organic cation cetyltrimethylammonium （CTMAB-Bents） were utilized as adsorbents and controlled release carders 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.