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在草甘的存在下,氧化铜纳米粒子的溶解动力学

Zhaoxun Yang¹, Jean-François Gaillard¹

¹Department of Civil and Environmental Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3109, USA.

|January 9, 2024

概括

草甘显著增加氧化铜纳米颗粒 (n-CuO) 溶解率,影响农药的输送和环境相互作用. 这种相互作用对于理解除草剂在土壤水中的n-CuO行为至关重要.

科学领域:

环境化学环境化学
纳米技术纳米技术
农业科学农业科学

背景情况:

铜氧化物纳米颗粒 (n-CuO) 被探索为基于铜的农药输送系统.
与草甘除草剂同时应用需要了解n-CuO相互作用.
n-CuO和散装CuO (b-CuO) 的溶解动力学是通过表面控制的.

研究的目的:

在草甘的存在下研究n-CuO和b-CuO的溶解动力学.
为了比较草甘对CuO溶解的影响与天然土壤配体氧酸盐.
在环境相关条件下评估这些相互作用.

主要方法:

在代表性度的n-CuO (∼0.9 mg/L) 和草甘 (50 μM) 进行的实验.
在简单的KNO3电解质和复杂的多电解质溶液中测量的溶解速率.
在pH 6.5和环境温度 (∼20°C) 进行的动力实验.

主要成果:

在KNO3.3的pH值为6.5下,草甘显著增加了CuO溶解率的两个数量级 (9.3±0.7×10−3h−1) 与其缺失 (8.9±3.6×10−5h−1) 相比,在KNO3.5pH值6.5下,草甘显著增加了CuO溶解率的两个数量级 (9.3±0.7×10−3h−1).
在多电解质溶液中,草甘在前10小时内将CuO溶解率提高了215.
氧沙酸盐在简单的电解质中显示出比草甘更快的CuO溶解,但由于离子结合,复杂溶液中的溶解速度相似.

结论:

草甘显著加速CuO纳米颗粒和散装材料的溶解.
这种增强的溶解对与除草剂一起使用的n-CuO农药的疗效和环境命运有影响.
了解连接体-环境相互作用对于预测复杂环境矩阵中的纳米粒子行为至关重要.

关键词:

铜氧化物纳米粒子铜氧化物纳米粒子草甘是一种天然的草甘.运动学运动学联结体促进的溶解

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