化工进展 ›› 2019, Vol. 38 ›› Issue (02): 1122-1128.DOI: 10.16085/j.issn.1000-6613.2018-0779

• 资源与环境化工 • 上一篇    下一篇

Fe2O3 改性蒙脱土对邻苯二酚的高效去除机理

王朋,常亚洲,石林,郎笛,张迪()   

  1. 昆明理工大学环境科学与工程学院,云南 昆明 650500
  • 收稿日期:2018-04-15 修回日期:2018-05-21 出版日期:2019-02-05 发布日期:2019-02-05
  • 通讯作者: 张迪
  • 作者简介:<named-content content-type="corresp-name">王朋</named-content>(1987—),男,博士研究生,研究方向为有机污染物环境行为。|张迪,副教授,研究方向为有机污染物环境行为。E-mail:<email>zhangdi2002113@sina.com</email>。
  • 基金资助:
    国家自然科学基金(41663014,41303093)

Efficient removal mechanism of catechol by Fe2O3 modified montmorillonite

Peng WANG,Yazhou CHANG,Lin SHI,Di LANG,Di ZHANG()   

  1. Faculty of Environmental Science and Engineering, Kunming University of Science & Technology, Kunming 650500, Yunnan, China
  • Received:2018-04-15 Revised:2018-05-21 Online:2019-02-05 Published:2019-02-05
  • Contact: Di ZHANG

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

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