磁性生物炭活化过硫酸盐去除水中罗丹明B

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Abstract The magnetic CoFe₂O₄/biochar (MPBC) derived from pine needles was prepared by a sol-gel method. The structure and surface physical-chemical properties of as-prepared MPBC was characterized by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FT-IR), scanning electron microscopy (SEM), specific surface area analyzer (BET), X-ray photoelectron spectrometer (XPS) and vibrating sample magnetometer (VSM). The MPBC was used to activate peroxynitrite (PS) for Rhodamine B (RhB) removal. The results showed that under the optimal conditions of initial RhB concentration of 40mg/L, initial pH value of 5, temperature of 25℃, MPBC dosage of 8.0g/L and PS dosage of 0.05mol/L, the removal rate of RhB reached 98.8% after 120min. The removal rate of RhB tended to increase with the increasing of MPBC dosage and initial RhB concentration, and was effective in a wide range of pH value from 3 to 11. Humic acid, NO₃^-, HCO₃^- and Cl^- inhibited the removal efficiency of RhB. Free radical quenching experiments and electron paramagnetic resonance (EPR) tests exhibited that the active species including SO₄^·-, ·OH, ¹O₂ and ·O₂^- played a dominating role in the MPBC-PS system. The saturation magnetization intensity of MPBC measured by VSM was 23.41 emu/g, indicating that it was easy to be magnetically recovered. After 5 cycles of reuse, the RhB removal rate still reached 95.4%, showing good stability.

Key words： magnetic biochar persulfate Rhodamine B

Received: 18 August 2022

PACS:

X703.5

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	Articles by authors
	XIANGLI Peng
	CUI Jia-li
	ZHANG Feng
	LI Hong-yan
	CUI Jian-guo
	WEI Liu-yi

Cite this article:

XIANGLI Peng,CUI Jia-li,ZHANG Feng等. Removal of Rhodamine B from aqueous solutions by magnetic biochar activated persulfate[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1672-1687.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1672

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