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原位水解生成的羟基氧化铁凝聚吸附除磷效能与机制

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齐晓璐, 孙丽华, 张雅君, 刘泊. 原位水解生成的羟基氧化铁凝聚吸附除磷效能与机制[J]. 环境工程学报, 2014, 8(2): 505-512.
引用本文: 齐晓璐, 孙丽华, 张雅君, 刘泊. 原位水解生成的羟基氧化铁凝聚吸附除磷效能与机制[J]. 环境工程学报, 2014, 8(2): 505-512.
shu
Qi Xiaolu, Sun Lihua, Zhang Yajun, Liu Bo. Effectiveness and mechanism of the in situ formed iron hydroxide (FeOxHy) towards the removal of phosphate by coagulation and adsorption[J]. Chinese Journal of Environmental Engineering, 2014, 8(2): 505-512.
Citation: Qi Xiaolu, Sun Lihua, Zhang Yajun, Liu Bo. Effectiveness and mechanism of the in situ formed iron hydroxide (FeOxHy) towards the removal of phosphate by coagulation and adsorption[J]. Chinese Journal of Environmental Engineering, 2014, 8(2): 505-512.
shu

原位水解生成的羟基氧化铁凝聚吸附除磷效能与机制

  • 1.

    北京建筑大学环境与能源工程学院, 北京 100044

  • 2.

    北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室, 北京 100044

  • 基金项目:

    国家自然科学基金资助项目（51208021，51278026）

    北京市教委项目（KM201310016004）

    校博士启动基金（00331611009）

  • 中图分类号: X703

Effectiveness and mechanism of the in situ formed iron hydroxide (FeOxHy) towards the removal of phosphate by coagulation and adsorption

  • 1.

    School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

  • 2.

    Key Laboratory of Urban Stormwater System & Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

  • Fund Project:

  • 摘要: 将不同摩尔比Fe3+与OH-（[Fe3+]：[OH-]=1：0、1：1、1：2和1：3）反应获得原位水解生成的羟基氧化铁（in situ FeOxHy），研究了具有不同水解程度的羟基氧化铁对凝聚吸附除磷效能与机制。研究显示，In situ FeOxHy对磷的去除率随铁投量增大而升高，且均在中性pH范围内具有最佳除磷效果；在相同铁投量条件下，磷去除率随着[OH-]：[Fe3+]的升高而降低；当体系碱度较低时（pH-可促进Fe3+水解而提高除磷效果。4种羟基氧化铁均可在15 s内可快速吸附磷，且吸附过程符合准二级动力学模型；Freundlich模型均可很好地描述磷在4种羟基氧化铁表面的吸附行为。磷酸盐吸附后，In situ FeOxHy表面Zeta电位明显降低，且[Fe3+]：[OH-]为1：0的羟基氧化铁降低最为显著。结合MINITEQ计算软件磷酸盐、铁盐形态分析结果显示，对于碱度较低的体系，通过投加一定量OH-可促进Fe3+水解，进而使得其更易与水中H2PO4-与HPO42-结合，生成具有多核羟基的磷酸铁络合物，进而提高除磷效果。
    Abstract: We prepared the in situ formed iron hydroxide (In situ FeOxHy) by the interactions between Fe3+ and OH- at different molar ratios of 1:0,1:1,1:2,and 1:3,and investigated the performance and mechanism involved in the removal of phosphate.The removal efficiency increased with elevated doses of FeOxHy and the maximum removal was observed to be in neutral pH ranges.The elevated ratios of OH- to Fe3+ inhibit the removal of phosphate whereas at low alkalinity,the introduction of OH- shows beneficial effects.The abovementioned four kinds of FeOxHy can rapidly adsorb most phosphate within 15 s,and the adsorption process can be well described by the Pseudo-second-order kinetic model.Freundlich model can well describe the adsorption of phosphorus onto these four FeOxHy.The adsorption of phosphate significantly decreases the zeta potential of these in situ FeOxHy.The MINITEQ software can indicate the species distribution of phosphate and iron salts,and the theoretical calculation indicates that the introduced OH- can promote the hydrolysis of Fe3+ especially in low alkalinity system,which can easily adsorb H2PO4- and HPO42- and form the multinuclear hydroxy iron phosphate complexes thereafter.
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  • 收稿日期:  2013-04-22
  • 刊出日期:  2014-01-27

原位水解生成的羟基氧化铁凝聚吸附除磷效能与机制

  • 1. 北京建筑大学环境与能源工程学院, 北京 100044
  • 2. 北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室, 北京 100044
  • 收稿日期:  2013-04-22
基金项目:

国家自然科学基金资助项目（51208021，51278026）

北京市教委项目（KM201310016004）

校博士启动基金（00331611009）

摘要: 将不同摩尔比Fe3+与OH-（[Fe3+]：[OH-]=1：0、1：1、1：2和1：3）反应获得原位水解生成的羟基氧化铁（in situ FeOxHy），研究了具有不同水解程度的羟基氧化铁对凝聚吸附除磷效能与机制。研究显示，In situ FeOxHy对磷的去除率随铁投量增大而升高，且均在中性pH范围内具有最佳除磷效果；在相同铁投量条件下，磷去除率随着[OH-]：[Fe3+]的升高而降低；当体系碱度较低时（pH-可促进Fe3+水解而提高除磷效果。4种羟基氧化铁均可在15 s内可快速吸附磷，且吸附过程符合准二级动力学模型；Freundlich模型均可很好地描述磷在4种羟基氧化铁表面的吸附行为。磷酸盐吸附后，In situ FeOxHy表面Zeta电位明显降低，且[Fe3+]：[OH-]为1：0的羟基氧化铁降低最为显著。结合MINITEQ计算软件磷酸盐、铁盐形态分析结果显示，对于碱度较低的体系，通过投加一定量OH-可促进Fe3+水解，进而使得其更易与水中H2PO4-与HPO42-结合，生成具有多核羟基的磷酸铁络合物，进而提高除磷效果。

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