Construction of Brönsted sites on pyrite surface via plasma technology for efficient hydrolysis of microcystins-LR

IF 5.9 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Sciences-china Pub Date : 2025-01-24 DOI:10.1016/j.jes.2025.01.016

Qing Zhang , Yuting He , Jing Zhang , Yadong Li , Yanfen Fang , Yunzhi Tan

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Abstract

Enhancing the catalytic hydrolysis efficiency of microcystins (MCs) at ambient temperature has been a persistent challenge in water treatment. We employed N₂/low-temperature plasma technology to modify the surface of natural pyrites (NP), and the resulting nitrogen-modified pyrites (NP_N) with a nanorod structure and new Fe-N_x sites are more efficient for the hydrolysis of microcystins-LR (MC-LR). Kinetic experiments revealed that NP_N exhibited significantly higher hydrolysis activity (k_obs = 0.1471 h⁻¹) than NP (0.0914 h⁻¹). Liquid chromatography-mass spectrometry (LC/MS) for the intermediates produced by hydrolyzing MC-LR, in situ attenuated total reflectance Fourier transform infrared spectroscopy (in situ ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) analysis unfolded that the Fe and N atoms of Fe-N_x sites on the surface act of NP_N as Lewis acid and Brönsted basic respectively, selectively breaking amide bond on MC-LR molecule. This study demonstrates the effectiveness of plasma technology in modifying mineral materials to enhance their catalytic activity, providing a new method for eliminating MCs in practical water treatment.

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来源期刊

Journal of Environmental Sciences-china 环境科学-环境科学

CiteScore

13.70

自引率

0.00%

发文量

6354

审稿时长

2.6 months

期刊介绍： The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.