海绵铁三金属降解对硝基苯酚的影响因素及催化机理

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Abstract Pd-(Cu-s-Fe⁰) trimetals were synthesized adopting with displacement reactions under ultrasonic conditions, and the surface structure of the aforementioned materials was further characterized with scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). Moreover, the effects of noble metal loading sequence, the loading amount, input dosage and recycling reuse for the degradation of p-nitrophenol (PNP) was studied in detail. The experimental results show that the catalytic activity of Pd-(Cu-s-Fe⁰) was higher than that of Cu-(Pd-s-Fe⁰) and (Cu-Pd)-s-Fe⁰. The loading amounts of Cu and Pd were optimized as 5% and 0.025%, respectively. Under the optimized conditions including 30g/L of Pd-(Cu-s-Fe⁰), the removal content of PNP (100mL, initial concentration of 100mg/L) reached more than 80% after 30min of ultrasonic reactions, and the degradation reactions conformed to a pseudo-first-order kinetics equation. Furthermore, after 4times of recycling tests, Pd-(Cu-s-Fe⁰) showed good recycling performance. Based on the UV-visible spectral variations and high-performance liquid chromatography, we proposed the degradation mechanism mainly via catalytic reductions of PNP into p-aminophenol (PAP).

Key words： sponge iron Pd-(Cu-s-Fe⁰) trimetal p-nitrophenol (PNP) degradation mechanism

Received: 04 February 2021

PACS:

X703.5

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	Articles by authors
	LI Fang-fang
	JU Yong-ming
	DENG Dong-yang
	JIA Wen-chao
	DING Zi-rong
	LEI Guo-yuan

Cite this article:

LI Fang-fang,JU Yong-ming,DENG Dong-yang等. Study on influencing factors and catalytic mechanism of p-nitrophenol degradation with sponge iron-based tri-metals[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4670-4676.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4670

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