磁性MZF@PDA-PAC活化过一硫酸盐降解水中双氯芬酸钠的机制

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Abstract To prepare a highly efficient heterogeneous carbon-based magnetic catalyst with excellent solid-liquid separation properties and good stability for activating potassium peroxymonosulfate (PMS), this study employed Mn_0.6Zn_0.4Fe₂O₄ (MZF) magnetic nanoparticles (MNPs) as the magnetic core, and dopamine (DA) along with powdered activated carbon (PAC) was utilized to synthesize the magnetic nanocomposite MZF@PDA-PAC through a step-by-step deposition method. MZF@PDA-PAC was characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and a vibrating sample magnetometer (VSM). The efficiency of MZF@PDA-PAC in activating PMS for the degradation of diclofenac sodium (DS) was investigated, along with the removal mechanism of DS and the activation mechanism of PMS by MZF@PDA-PAC. The results showed that MZF@PDA-PAC possessed a "core-shell" structure, which exhibited excellent dispersibility and solid-liquid separation performance in water. Both radical pathways (SO₄·-, HO· and O₂^·-) and non-radical pathways (electron transfer) played important roles in DS removal in the MZF@PDA-PAC+PMS system, with DS and TOC removal efficiencies of 99.50% and 66.32%, respectively. MZF@PDA-PAC was shown to have high stability and good recyclability, which has broad application prospect in the degradation of refractory organic compounds.

Key words： magnetic catalyst heterogeneous sulfate radica diclofenac sodium degradation

Received: 13 May 2024

PACS:

X703.5

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	LI Shi-yao
	YU Jing
	XU Dong-ying

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LI Shi-yao,YU Jing,XU Dong-ying. Degradation mechanism of diclofenac sodium by potassium persulfate activated by magnetic MZF@PDA-PAC in water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 185-197.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I1/185

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