NAME

张耀斌

Paper Publications

水体中腐殖酸与Fe(Ⅲ)的络合物对2,4-D光降解的作用
  • Hits:
  • Indexed by:

    期刊论文

  • First Author:

    于春艳

  • Correspondence Author:

    Quan, X.; Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China; email: quanxie@dlut.edu.cn

  • Co-author:

    赵慧敏,陈硕,张耀斌,全燮

  • Date of Publication:

    2010-02-15

  • Journal:

    环境科学

  • Included Journals:

    Scopus、PubMed、PKU、ISTIC、CSCD

  • Document Type:

    J

  • Volume:

    31

  • Issue:

    2

  • Page Number:

    379-384

  • ISSN No.:

    0250-3301

  • Key Words:

    腐殖酸;铁;络合物;2,4-二氯苯氧乙酸(2,4-D);光降解

  • Abstract:

    为探讨水体中腐殖酸(humic acids,HAs)和铁元素对共存系统中环境污染物迁移转化的影响,利用红外光谱、紫外/可见吸收光谱和荧光光谱仪等手段表征了腐殖酸和Fe(Ⅲ)共存时的结构形态.结果表明,二者形成了稳定的络合物.电子顺磁共振图谱表明,腐殖酸、Fe(Ⅲ)以及HAs-Fe(Ⅲ)络合物在λ=355 nm光照下均能产生·OH.氙灯光照下(λ>290 nm),除草剂2,4-二氯苯氧乙酸(2,4-dichlorophenoxyacetic acid,2,4-D)的光降解遵循准一级动力学过程.单纯2,4-D(2 mg·L-1)溶液的降解速率常数为0.007 h-1,而含有HAs(5 mg·L-1)、Fe(Ⅲ)(0.2 mmol·L-1)及二者络合物的2,4-D溶液的降解速率常数分别是0.004、0.034和0.046 h-1.腐殖酸存在时,2,4-D的光降解速率受到了抑制;而Fe(Ⅲ)的存在加速了2,4-D的光降解;腐殖酸和Fe(Ⅲ)共存时,所形成的HAs-Fe(Ⅲ)络合物对2,4-D的光降解速率比单独的Fe(Ⅲ)存在时更快.

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