磁性生物炭催化高铁酸盐降解新污染物探究

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Abstract The degradation efficiency of various emerging pollutants by potassium ferrate (Fe(VI)) catalysed through magnetic biochar (MC) prepared using hydrothermal-calcination method was investigated. The reactive species in M-BC/Fe(VI) system and the effects of the dosage of M-BC, Fe(VI), pH value and natural organic matters on the degradation efficiency of sulfamethoxazole (SMX) were studied. The results indicated that the removal of SMX by alone M-BC (50mg/L) and Fe(VI) (50μmol/L) were 3.5% and 54.1% during 20min, respectively, while the M-BC/Fe(VI) system achieved an SMX degradation rate of 89.6%. Experiments with probe compounds and inhibitors confirmed that the primary reactive species in the system were intermediate valence iron (Fe(V)/Fe(IV)). Fourier-transform infrared spectroscopy analysis revealed that the main active sites on M-BC were surface phenolic hydroxyl groups. Under pH conditions of 8, increasing the dosages of Fe(VI) and M-BC enhanced the removal of SMX by the M-BC/Fe(VI) system. Compared to the alone Fe(VI) system, the degradation of SMX in the M-BC/Fe(VI) system was increased by 114%, 63.6%, 300%, and 350% at pH 7, 8, 9, and 10, respectively. Low concentrations of natural organic matter (1mg/L) promoted the degradation of SMX by the M-BC/Fe(VI) system, but high concentrations of natural organic matter (5~10mg/L) competed with SMX for Fe(VI) and Fe(V)/Fe(IV), leading to a decrease in the degradation efficiency of SMX. Additionally, the M-BC/Fe(VI) system achieved SMX degradation of 100% and 83.7% in spring and Yellow River water, highlighting its potential for practical application in water treatment process.

Key words： emerging pollutants magnetic biochar ferrate high-valent iron intermediate (Fe(V)/Fe(IV))

Received: 10 May 2024

PACS:

X703.5

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	Articles by authors
	QIU Qi
	ZHENG Rui-bin
	ZHOU Wei-wei
	SUN Shao-fang
	GAO Ming-chang
	QIU Li-ping
	LI Hong-lan

Cite this article:

QIU Qi,ZHENG Rui-bin,ZHOU Wei-wei等. Degradation of emerging pollutants via ferrate catalyzed by magnetic biochar: efficiency and mechanism[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(1): 302-309.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I1/302

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