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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摘要

利用正硅酸乙酯水解制备得到"核-壳"结构的磁性吸附剂MZF@SiO₂（MZFS），采用X射线衍射（XRD）、透射电子显微镜（TEM）、振动样品磁强计（VSM）和傅利叶变换红外光谱（FT-IR）对MZFS的结构和性能进行表征，并研究MZFS对偶氮染料中性红（NR）的吸附性能.结果表明，拟二级动力学和Freundlich模型均能较好地描述该吸附过程，吸附过程的速率控制步骤为化学吸附；吸附自由能E为0.472-0.773kJ/mol，△G为-20~0kJ/mol，△H为37.5kJ/mol，表明该过程是以物理吸附为主的自发吸热过程.FT-IR结果表明吸附的主要作用力为分子间氢键，MZFS可采用15% wt H₂O₂进行原位再生.研究结果能为偶氮染料废水处理方法的革新提供基础理论数据.

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	曾红杰
	余静
	王盈盈

关键词 ：吸附, 纳米复合材料, 偶氮染料, 磁分离, 再生

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

收稿日期: 2019-02-20

PACS:

X703

基金资助:

国家自然科学基金（51608061）；大学生创新创业训练计划（201810621052）

通讯作者: 余静 E-mail: yujing@cuit.edu.cn

作者简介: 曾红杰(1995-),女,四川达州人,成都信息工程大学硕士研究生,主要研究方向:水污染控制理论与技术.

引用本文:

曾红杰, 余静, 王盈盈. 磁性吸附剂MZFS吸附偶氮染料中性红的性能及机理[J]. 中国环境科学, 2019, 39(9): 3814-3823. 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. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3814-3823.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2019/V39/I9/3814

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