氧化铜纳米颗粒在草甘膦存在下的溶解动力学

IF 4.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Zhaoxun Yang , Jean-François Gaillard
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引用次数: 0

摘要

最近,有人提出将氧化亚铜纳米颗粒(n-CuO)作为一种替代方法,用于输送铜基杀虫剂,以控制真菌侵染。随着草甘膦作为除草剂的同时使用,需要对 n-CuO 与这种强配体之间的相互作用进行评估。我们研究了正氧化钴和块状氧化钴(b-CuO)颗粒在草甘膦商用产品存在下的溶解动力学,并将其与土壤水中的天然配体草酸盐进行了比较。我们在具有代表性的正氧化钴和草甘膦使用条件(约 0.9 mg/L 正氧化钴和 50 μM 草甘膦)浓度水平下进行了实验。众所周知,钙钛矿(CuO)的溶解动力学受表面控制,因此我们确定,在 pH 值为 6.5、T ~ 20 °C 的条件下,使用 KNO3 作为背景电解质,草甘膦的存在导致溶解速率为 9.3 ± 0.7 ×10-3 h-1。相比之下,在相同条件下,如果没有草甘膦,溶解速率要低 2 个数量级:8.9 ± 3.6 ×10-5 h-1。在更复杂的多电解质水溶液中也观察到了同样的效果;草甘膦在反应的最初 10 小时内促进了 n-CuO 和 b-CuO 的溶解速度,提高了约 2 到约 15 倍。在简单的 KNO3 电解质中,草酸盐导致 CuO 溶解的速度比草甘膦快约两倍。然而,当反应在多电解质溶液中进行时,由于草酸盐主要与 Ca2+ 和 Mg2+ 结合,两种配体在反应头 10 小时内的动力学速率大致相同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dissolution kinetics of copper oxide nanoparticles in presence of glyphosate

Dissolution kinetics of copper oxide nanoparticles in presence of glyphosate

Dissolution kinetics of copper oxide nanoparticles in presence of glyphosate

Recently CuO nanoparticles (n-CuO) have been proposed as an alternative method to deliver a Cu-based pesticide for controlling fungal infestations. With the concomitant use of glyphosate as an herbicide, the interactions between n-CuO and this strong ligand need to be assessed. We investigated the dissolution kinetics of n-CuO and bulk-CuO (b-CuO) particles in the presence of a commercial glyphosate product and compared it to oxalate, a natural ligand present in soil water. We performed experiments at concentration levels representative of the conditions under which n-CuO and glyphosate would be used (∼0.9 mg/L n-CuO and 50 μM of glyphosate). As tenorite (CuO) dissolution kinetics are known to be surface controlled, we determined that at pH 6.5, T ∼ 20 °C, using KNO3 as background electrolyte, the presence of glyphosate leads to a dissolution rate of 9.3 ± 0.7 ×10−3 h−1. In contrast, in absence of glyphosate, and under the same conditions, it is 2 orders of magnitude less: 8.9 ± 3.6 ×10−5 h−1. In a more complex multi-electrolyte aqueous solution the same effect is observed; glyphosate promotes the dissolution rates of n-CuO and b-CuO within the first 10 h of reaction by a factor of ∼2 to ∼15. In the simple KNO3 electrolyte, oxalate leads to dissolution rates of CuO about two times faster than glyphosate. However, the kinetic rates within the first 10 h of reaction are about the same for the two ligands when the reaction takes place in the multi-electrolyte solution as oxalate is mostly bound to Ca2+ and Mg2+.

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来源期刊
NanoImpact
NanoImpact Social Sciences-Safety Research
CiteScore
11.00
自引率
6.10%
发文量
69
审稿时长
23 days
期刊介绍: NanoImpact is a multidisciplinary journal that focuses on nanosafety research and areas related to the impacts of manufactured nanomaterials on human and environmental systems and the behavior of nanomaterials in these systems.
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