Fe2O3 改性蒙脱土对邻苯二酚的高效去除机理

doi:10.16085/j.issn.1000-6613.2018-0779

摘要/Abstract

摘要：

蒙脱土及其改性后的吸附材料在环境领域广泛应用。本文研究了蒙脱土（MT-Na）及其Fe₂O₃改性后（MT-Fe₂O₃）用于去除不同pH条件溶液中的邻苯二酚。与MT-Na相比，MT-Fe₂O₃对邻苯二酚表现出更快速和高效的去除效果。随着pH升高，MT-Na从溶液中除去邻苯二酚增加，而MT-Fe₂O₃表现出相反的现象。双室一级去除动力学模型拟合结果表明，MT-Na的快室去除邻苯二酚来自于吸附，慢室去除主要是来自于降解；MT-Fe₂O₃快室主要是吸附和最初的降解，随着降解中间产物在表面的生成，阻碍了邻苯二酚在颗粒上的吸附，减缓了降解速率，表现为慢室去除。Fe₂O₃诱导生成的·OH是MT-Fe₂O₃高效去除邻苯二酚的主要因素。区分黏土颗粒去除邻苯二酚过程中的吸附和降解的贡献，将有助于更加准确地评估黏土颗粒的环境功效和描述邻苯二酚的环境行为。

关键词: 蒙脱土改性, 邻苯二酚, 去除动力学, 吸附, 降解

Abstract:

Montmorillonite and its derivatives are widely used adsorbent in environmental field. In this study, montmorillonite (MT-Na) and Fe₂O₃ modified montmorillonite (MT-Fe₂O₃) were used to remove catechol at various pH. Higher efficacy and faster removal of catechol was detected for MT-Fe₂O₃ than MT-Na. Catechol removal from solution was higher with MT-Na with increasing pH, while MT-Fe₂O₃ showed a reverse trend. Removal kinetics results showed fast and slow compartment of catechol removal involving adsorption and subsequent degradation of the latter. For MT-Fe₂O₃, fast compartment was attributed to adsorption and initial degradation. The retardation of catechol degradation rate manifested in the slow compartment was attributed to the hindrance of the active reaction sites by intermediate degradation products, Fe₂O₃ mediated generation of ·OH is central regarding removal of catechol using MT-Fe₂O₃. Efficient degradation of organic contaminants by montmorillonite underscores the importance of clay particles as capable adsorbent. This study will provide more precise assessment of the distinct contribution of clay particles in adsorption and degradation of catechol in environmental media.

Key words: montmorillonite modified, catechol, removal kinetics, adsorption, degradation

中图分类号:

王朋, 常亚洲, 石林, 郎笛, 张迪. Fe₂O₃ 改性蒙脱土对邻苯二酚的高效去除机理[J]. 化工进展, 2019, 38(02): 1122-1128.

Peng WANG, Yazhou CHANG, Lin SHI, Di LANG, Di ZHANG. Efficient removal mechanism of catechol by Fe₂O₃ modified montmorillonite[J]. Chemical Industry and Engineering Progress, 2019, 38(02): 1122-1128.

图/表 8

参考文献 26

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样品	pH	S _total /mg·kg^-1	SE	PFOM			2-PFOM
样品	pH	S _total /mg·kg^-1	SE	k ₁/h^-1	SE	r ² _adj	f _fast	SE	k _fast/h^-1	SE	f _slow	SE	k _slow/h^-1	SE	r ² _adj
MT-Na	3	200.49	21.94	0.002	0	0.653	0.14	0.02	0.163	0.163	0.86	0.02	0.001	0	0.909
	6	259.65	5.61	0.003	0	0.716	0.16	0.01	0.191	0.031	0.84	0.01	0.001	0	0.976
	9	290.03	2.63	0.002	0.001	0.391	0.23	0.01	0.270	0.087	0.77	0.01	0.001	0	0.962
MT-Fe₂O₃	3	870.95	5.63	0.026	0.004	0.826	0.58	0.03	0.236	0.022	0.42	0.02	0.014	0.001	0.994
	6	777.16	4.10	0.016	0.002	0.813	0.48	0.02	0.455	0.020	0.52	0.01	0.010	0.001	0.996
	9	645.76	8.74	0.009	0.002	0.670	0.41	0.02	0.576	0.080	0.59	0.01	0.006	0.001	0.981

样品	pH	S _total /mg·kg^-1	SE	PFOM			2-PFOM
样品	pH	S _total /mg·kg^-1	SE	k ₁/h^-1	SE	r ² _adj	f _fast	SE	k _fast/h^-1	SE	f _slow	SE	k _slow/h^-1	SE	r ² _adj
MT-Na	3	200.49	21.94	0.002	0	0.653	0.14	0.02	0.163	0.163	0.86	0.02	0.001	0	0.909
	6	259.65	5.61	0.003	0	0.716	0.16	0.01	0.191	0.031	0.84	0.01	0.001	0	0.976
	9	290.03	2.63	0.002	0.001	0.391	0.23	0.01	0.270	0.087	0.77	0.01	0.001	0	0.962
MT-Fe₂O₃	3	870.95	5.63	0.026	0.004	0.826	0.58	0.03	0.236	0.022	0.42	0.02	0.014	0.001	0.994
	6	777.16	4.10	0.016	0.002	0.813	0.48	0.02	0.455	0.020	0.52	0.01	0.010	0.001	0.996
	9	645.76	8.74	0.009	0.002	0.670	0.41	0.02	0.576	0.080	0.59	0.01	0.006	0.001	0.981

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Fe₂O₃ 改性蒙脱土对邻苯二酚的高效去除机理

Efficient removal mechanism of catechol by Fe₂O₃ modified montmorillonite

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