OMS-2活化过硫酸盐降解有机污染物

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Abstract In the present study, Manganese oxide octahedral molecular sieve (OMS-2_PS) was synthesized using K₂S₂O₈ and (CH₃COO)₂Mn·4H₂O via a solid-phase method. The physicochemical properties of OMS-2_PS were analyzed via X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The performance of persulfate activation by OMS-2_PS for degrading organic contaminants was examined. This study also investigated the effect of various parameters, including dosage of OMS-2_PS, PS concentration, and initial pH, on AO7 removal efficiency. Moreover, the mechanism of PS activation by OMS-2_PS was explored. The results showed OMS-2_PS was successfully synthesized via a solid-phase method, which exhibits a nanorod structure. OMS-2_PS could activate PS to degrade organic contaminants. The use of 50mg/L AO7, 1.0g/L OMS-2_PS, and 2.0mmol/L PS led to the AO7 removal and mineralization rates of 97.4% and 50.1%, respectively. Ion coexistence experiments demonstrated that AO7 removal was considerably inhibited by Cl⁻, NO₃⁻, and CO₃²⁻, while HA had almost no effect on it. The free radical quenching experiments and electron paramagnetic resonance (EPR) analysis indicated ·OH and SO₄^•−were the primary active oxygen species in the OMS-2_PS/PS system, and ·OH played the dominant role in the AO7 degradation. XPS analysis revealed Mn(IV) and lattice oxygen on the surface of OMS-2_PS were the main active sites for PS activation. Based on experiment results, a potential activation mechanism of PS by OMS-2_PS was proposed that PS combined with OMS-2_PS through the hydroxyl groups on the surface of OMS-2_PS, and then PS reacted with the active sites on the surface of OMS-2_PS to produce active oxygen species. In addition, The OMS-2_PS/PS system effectively removed AO7 from different water bodies, and also degraded efficiently other pollutants including bisphenol A, naphthalene, and tetracycline, indicating that the OMS-2_PS/PS system have a bright application prospect in environmental pollution control.

Key words： OMS-2 catalytic activation persulfate organic contaminants

Received: 28 October 2024

PACS:

X703.5

Corresponding Authors: 廖用开,责任作者,工程师,ykliao@iue.ac.cn;蔡超,研究员,ccai@iue.ac.cn E-mail: ykliao@iue.ac.cn;ccai@iue.ac.cn

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	SHEN Yue
	CAO Hong-jian
	LIU Xiao-tian
	LIAO Yong-kai
	CAI Chao

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SHEN Yue,CAO Hong-jian,LIU Xiao-tian等. Degradation of organic contaminants by OMS-2 activated persulfate[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 1939-1950.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I4/1939

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