Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 443, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.130265
Keywords
Degradation pathway; Fenton -like reaction; In situ remediation; Nanozyme; Nicosulfuron
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A novel nanozyme was synthesized for the efficient degradation of herbicides in water and soil, providing a new reference for in situ remediation of herbicide pollution.
Herbicide residues in the environment threaten high-quality agriculture and human health. Consequently, in situ remediation of herbicide contamination is vital. We synthesized a novel self-catalyzed nanozyme, ultrasmall (2-3 nm) copper peroxide nanodots modified by citric acid (CP@CA) for this purpose, which can break down into H2O2 and Cu2+ in water or soil. Ubiquitous glutathione reduces Cu2+ into Cu+, which promotes the decomposition of H2O2 into center dot OH through a Fenton-like reaction under mild acid conditions created by the presence of citric acid. The generated center dot OH efficiently degrade nicosulfuron in 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 the in situ remediation of herbicide pollution.
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