CoFe2O4作为Co(II) 离子的来源,用于使用过氧化硫酸盐氧化伊米达克洛普里德杀虫剂:工艺参数和表面变化的影响
Yoisel B Broterson1, Yeison Núñez-de la Rosa1, Luis Guillermo Cuadrado Durango1
1Federal University of São Carlos (UFSCar), Department of Chemistry, 13565-905, São Carlos, SP, Brazil.
Chemosphere
|January 24, 2024
概括
铁纳米颗粒激活过氧硫酸盐 (PMS) 来降解昆虫杀虫剂伊米达克洛普里德 (IMD). 化离子,而不是固体催化剂,主要驱动IMD氧化,形成化副产品.
科学领域:
- 环境化学环境化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 伊米达克洛普里德 (IMD) 是一种广泛使用的杀虫剂,具有环境风险.
- 先进的氧化过程 (AOP) 对于降解持久性有机污染物至关重要.
- 基于的磁铁酸盐被探索为AOPs的催化剂.
研究的目的:
- 调查纳米级铁酸盐 (CoFe2O4) 用于氧硫酸盐 (PMS) 的现场化学激活.
- 在中性条件下使用CoFe2O4 / PMS系统评估imidacloprid (IMD) 杀虫剂的氧化.
- 了解催化剂负载,PMS度和溶液化学在IMD降解中的作用.
主要方法:
- 通过sol-gel和共同沉方法合成纳米级铁酸盐 (CoFe2O4).
- 在不同的条件下 (催化剂负荷,PMS度,pH,缓冲器) 使用CoFe2O4和PMS对IMD氧化的实验研究.
- 使用质谱和电化学技术 (电荷转移电阻,表面化) 分析IMD氧化副产品.
主要成果:
- CoFe2O4有效地激活了PMS用于IMD氧化,在超纯水中实现了高速率.
- 液化 (II) 离子对IMD氧化有显著的贡献,超过了固体CoFe2O4阶段的贡献.
- 最佳条件 (0.125 g L-1 CoFe2O4,500 μM PMS) 导致IMD通过激进 (HO•,SO4•-) 和非激进 (1O2) 物种有效降解.
- IMD氧化副产品包括化物种和环开裂碎片.
- 该过程在模拟的废水矩阵中仍然有效,尽管氧化率降低.
结论:
- 纳米 CoFe2O4 是中性 IMD 氧化中 PMS 的有效激活剂,主要由水的 Co (II) 离子驱动.
- CoFe2O4 / PMS系统产生反应性氧物种的组合,包括单氧,以有效降解污染物.
- 了解浸出离子和反应条件的作用对于优化复杂水矩阵中的AOP至关重要.
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