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首页> 外文期刊>RSC Advances >The influence of Si(IV) on the reactivity of [ Fe(III)]/[ Fe(II)] couples for 2-nitrophenol reduction in gamma-Al2O3 suspensions
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The influence of Si(IV) on the reactivity of [ Fe(III)]/[ Fe(II)] couples for 2-nitrophenol reduction in gamma-Al2O3 suspensions

机译：Si（iv）对[Fe（III）] / [Fe（II）]对2-硝基苯酚还原的反应性的影响γ-Al2O3悬浮液中的影响

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摘要

In a natural environment, Fe(II) adsorbed onto the surfaces of natural particles to form various surface complex species can influence the transformation of contaminants. The reductive reactivity of the [ Fe(III)]/[ Fe(II)] couples are close correlated with the surrounding conditions. In this study, we investigated the effects of Si(IV) on the reductive reactivity of [ Fe(III)]/[ Fe(II)] couples adsorbed onto gamma -Al2O3. Experiments were conducted under different conditions to investigate the effects of Si(IV) on the reactivity of [ Fe(III)]/[ Fe(II)] couples for 2-nitrophenol (2-NP, selected as the model pollutant) reduction in gamma-Al2O3 suspensions. Kinetics results revealed that chemical adsorption is the rate limiting step in Fe(II) and Si(IV) adsorption processes and the reduction of 2-NP is an endothermic reaction. The linear correlations between the reduced peak oxidation potential (E-p) (versus SCE) and 2-NP reduction rate (ln k), and between the adsorbed Fe(II) density (rho Fe(II)) and ln k, illustrated that E-p and rho Fe(II) are two key factors in the inhibiting effects of Si(IV) on the reductive reactivity of Fe(III)/Fe(II) couples on gamma-Al2O3. The results of Fe K-edge X-ray absorption spectroscopy revealed that the increase of Si(IV) concentration resulted in the gradual change in the composition of the adsorbed Fe species from pure AlOFe+ (gamma-Al2O3 surface-bound Fe(II) species with higher reductive reactivity) to a mixture of AlOFe+ and SiOFe+ (SiO2 surface-bound Fe(II) species with lower reductive reactivity), leading to the decrease in rho Fe(II), the positive shift in E-p, the increase in activation energy (E-a), and consequently the decrease in the reduction rate (ln k) of 2-NP.
机译：在天然环境中，吸附在天然颗粒表面上以形成各种表面复合物物质的Fe（II）可以影响污染物的转化。 [Fe（III）] / [Fe（II）]夫妇与周围条件相关的还原反应性。在这项研究中，我们研究了Si（iv）对吸附在γ-al2O3上的[Fe（III）] / [Fe（II）]夫妻的还原性反应性的影响。在不同条件下进行实验，以研究Si（IV）对2-硝基苯酚（2-NP，作为模型污染物）的反应性的影响对[Fe（III）] / [Fe（II）]夫妇的影响Gamma-Al2O3悬浮液。动力学结果显示，化学吸附是Fe（II）和Si（IV）吸附过程的速率限制步骤，并且2-NP的还原是吸热反应。降低峰氧化电位（EP）（相对于SCE）和2-NP还原率（LN k）之间的线性相关性，以及吸附的Fe（II）密度（Rho Fe（II））和LN K，示出了该EP rho fe（ii）是Si（iv）对γ-Al2O3对Fe（III）/ Fe（II）夫妇的还原性反应性抑制作用的两个关键因素。 Fe K-Edge X射线吸收光谱的结果显示，Si（IV）浓度的增加导致来自纯铝+（γ-Al2O3表面结合Fe（II）物种的吸附Fe物种组合物的逐渐变化较高的还原反应性）以熟料+和SiOFE +（SiO 2表面结合的Fe（II）物种的混合物，导致Rho Fe（II）的降低，EP的正换档，激活能量的增加（EA），因此，2-NP的减少率（LN K）的降低。

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  • 来源
    《RSC Advances》 |2018年第14期|共8页
  • 作者

    Tao Liang; Wang Shan-Li; Li Fang-Bai; Yu Nin-Ya; Wu Ke;

  • 作者单位

    Guangdong Inst Ecoenvironm Sci &

    Technol Guangdong Key Lab Integrated Agroenvironm Pollut Guangzhou 510650 Guangdong Peoples R China;

    Natl Taiwan Univ Dept Agr Chem Taipei 10617 Taiwan;

    Guangdong Inst Ecoenvironm Sci &

    Technol Guangdong Key Lab Integrated Agroenvironm Pollut Guangzhou 510650 Guangdong Peoples R China;

    Hunan Normal Univ Natl &

    Local Joint Engn Lab New Petrochem Mat &

    F Changsha 410081 Hunan Peoples R China;

    Guangdong Inst Ecoenvironm Sci &

    Technol Guangdong Key Lab Integrated Agroenvironm Pollut Guangzhou 510650 Guangdong Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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