Abstract
Herbicide residues in the environment threaten high-quality agriculture and human health. Consequently,in situremediation of herbicide contamination is vital. We synthesized a novel self-catalyzed nanozyme, ultrasmall (2–3 nm) copper peroxidenanodotsmodified bycitric acid(CP@CA) for this purpose, which can break down into H2O2and Cu2+in water or soil. Ubiquitousglutathionereduces Cu2+into Cu+, which promotes the decomposition of H2O2into •OH through a Fenton-like reaction under mild acid conditions created by the presence of citric acid. The generated •OH efficiently degradenicosulfuronin water and soil, and the maximum degradation efficiency could be achieved at 97.58% in water at 56 min. The possible degradation mechanisms of nicosulfuron were proposed through the 25 intermediates detected. The overall ecotoxicity of the nicosulfuron system was significantly reduced after CP@CA treatment. Furthermore, CP@CA had little impact on active components of soil bacterial community. Moreover, CP@CA nanozyme could effectively remove seven other sulfonylurea herbicides from the water. In this paper, a high-efficiency method for herbicide degradation was proposed, which provides a new reference for thein situremediation of herbicide pollution.
Journal of Hazardous Materials, IF=14.224
https://www.sciencedirect.com/science/article/pii/S0304389422020593
