• 首页|本刊简介|在线投稿|过刊浏览|高级检索|专家风采|学习园地|期刊论坛|联系我们
黏土矿物界面吸附Fe(Ⅱ)耦合对邻硝基苯酚还原转化的增强机理研究
The enhanced reductive transformation for 2-nitrophenol removal coupled to the Fe(Ⅱ) adsorbed at the interfaces of clay minerals
投稿时间:2019-05-16  
中文关键词:黏土  高岭石  蒙脱石  表面结合态Fe(Ⅱ)  领硝基苯酚  还原转化
英文关键词:clay  kaolinite  montmorillonite  surface-bonded Fe(Ⅱ)  2-nitrophenol  reductive transformation
基金项目:广东省自然科学基金重点项目(2018B030311021);国家自然科学基金资助项目(41372050)
作者单位E-mail
梁剑滔 华南师范大学 环境学院, 广东 广州 510006  
卢鹏澄 华南师范大学 环境学院, 广东 广州 510006  
寇卓瑶 华南师范大学 环境学院, 广东 广州 510006  
赵丹 华南师范大学 环境学院, 广东 广州 510006  
吴宏海 华南师范大学 环境学院, 广东 广州 510006 whh302@163.com 
摘要点击次数: 129
全文下载次数: 96
中文摘要:
      系统考查了Fe(Ⅱ)分别与高岭石、蒙脱石结合的界面结合系统对邻硝基苯酚(简称2-NP)的还原转化作用。研究表明,矿物表面结合态Fe(Ⅱ)能够有效提高2-NP的还原转化速率,2-NP的还原反应符合伪一级反应动力学方程,而且速率常数(k)随溶液pH值、亚铁离子初始浓度以及反应温度的升高而显著增大。当温度25℃,pH值6.7,Fe(Ⅱ)和2-NP初始浓度分别为3.0 mmol/L、0.022 mmol/L,以及黏土的投加量为4.0 g/L时,Fe(Ⅱ)/高岭石系统对2-NP的还原转化率在4.0 h内可达到100%。同样,pH值从6.0升高至7.3时,Fe(Ⅱ)/蒙脱石系统对2-NP的还原转化也显著增强;但在较低pH值和较低初始Fe(Ⅱ)浓度时,蒙脱石对Fe(Ⅱ)的还原催化性能不如高岭石,可归因于蒙脱石具有较高的离子交换性能。因此,Fe(Ⅱ)在上述两种矿物上吸附形态的差异是导致该系统对2-NP还原转化出现不同效应的根本原因。
英文摘要:
      In this study, the reductive transformations of 2-nitrophenol (2-NP) by interfacial complex systems of Fe(Ⅱ) associated with kaolinite and montmorillonite respectively were systematically investigated. The results showed that surface-bonded Fe(Ⅱ) species on the minerals can effectively improve the rate of reductive transformations. The reduction reactions of 2-NP over the complex systems can be described by the pseudo first-order kinetics. The rate constant (k) was increased with the pH, initial Fe(Ⅱ) concentration and reaction temperature. Moreover, 2-NP removal efficiency can reach 100% within 4.0 h by the presence of Fe(Ⅱ)/kaolinite system under the conditions of pH 6.7 and temperature 25℃, initial concentrations of 3.0 mmol/L Fe(Ⅱ) and 0.022 mmol/L 2-NP as well as the dose of kaolinite at 4.0 g/L. Similarly, when the solution pH increased from 6.0 to 7.3, the transformation for 2-NP removal was also clearly enhanced by the presence of Fe(Ⅱ)/montmorillonite system, but the conditions with a lower pH and a lower initial Fe(Ⅱ) concentration were quite not favorable for montmorillonite to effectively catalyze 2-NP to be reduced by Fe(Ⅱ), and the performance was even lower than that of kaolinite. This may be ascribed to montmorillonite having a higher cation-exchange capacity. Therefore, the difference in speciation of adsorbed Fe(Ⅱ) is the intrinsic reason for controling the 2-NP reductive transformation in the mentioned mineral interfacial reduction systems.
梁剑滔,卢鹏澄,寇卓瑶,赵丹,吴宏海,2019,黏土矿物界面吸附Fe(Ⅱ)耦合对邻硝基苯酚还原转化的增强机理研究[J].岩石矿物学杂志,38(6):775~781.
查看全文  查看/发表评论  下载PDF阅读器
关闭
您是本站第 6397269位访问者  京ICP备05032737号-8
版权所有:《岩石矿物学杂志》编辑部
主管:中国科学技术协会 主办:中国地质学会岩石学专业委员会 中国地质学会矿物学专业委员会 中国地质科学院地质研究所
技术支持:北京勤云科技发展有限公司

京公网安备 11010202007772号