磁性吸附剂MZFS吸附偶氮染料中性红的性能及机理

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Abstract

A "core-shell" structure of magnetic adsorbent MZF@SiO₂ (MZFS) was prepared by in-situ hydrolysis of tetraethylorthosilicate in this paper. And its structural properties were characterized via X-ray diffraction (XRD), transmission electron microscope (TEM), vibrating sample magnetometer (VSM) and Fourier transform infrared spectroscopy (FT-IR). The azo dyes of neutral red (NR) adsorption property on MZFS were further studied. It was showed that the adsorption kinetic performance could be described adopting pseudo-second-order model and the Freundlich model. Chemical adsorption was the rate control step based on the results. The adsorption free energy E, △G and △H were 0.472-0.773kJ/mol, -20~0kJ/mol, and 37.5kJ/mol respectively, indicating a physical adsorption dominated spontaneous and endothermic process. The intermolecular hydrogen bonding was deduced as the main adsorption force from the FT-IR results. MZFS could be in situ regenerated using 15%wt H₂O₂. These results provided basic theoretical data for the development of treatment to azo dye wastewater.

Key words： adsorption nanocomposite azo dyes magnetic separation regeneration

Received: 20 February 2019

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X703

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	ZENG Hong-jie
	YU Jing
	WANG Ying-ying

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ZENG Hong-jie,YU Jing,WANG Ying-ying. The performance and mechanism of adsorption azo dye neural red from aqueous solution using magnetic adsorbent MZFS[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3814-3823.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I9/3814

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