南京大学学报(自然科学版) ›› 2019, Vol. 55 ›› Issue (3): 504–510.doi: 10.13232/j.cnki.jnju.2019.03.018

• • 上一篇    下一篇

铁离子对紫外/乙酰丙酮法降解甲基橙的影响

董越男,吴兵党*   

  1. 污染控制与资源化国家重点实验室,南京大学环境学院,南京,210023
  • 收稿日期:2019-02-03 出版日期:2019-06-01 发布日期:2019-05-31
  • 通讯作者: 吴兵党 E-mail:wubingdang@163.com
  • 基金资助:
    国家自然科学基金(21522702,21677070),南京大学优秀博士研究生创新能力提升计划B(201701B017)

Effects of iron ion in the UV/acetylacetone(UV/AA) process on MO degradation

Dong Yuenan,Wu Bingdang*   

  1. State Key Laboratory of Pollution Control and Resource Reuse,School of the Environment,Nanjing University,Nanjing,210023,China
  • Received:2019-02-03 Online:2019-06-01 Published:2019-05-31
  • Contact: Wu Bingdang E-mail:wubingdang@163.com

摘要: 紫外/乙酰丙酮(UV/AA)法是一种新型的光化学技术,具有出色的脱色染料效果,但水中共存离子对该方法影响的研究较少. 以一种典型的难降解偶氮染料甲基橙(MO)为研究对象,考察了游离铁离子(Fe2+,Fe3+)和络合态Fe(III)(Fe(AA)3)对UV/AA法降解MO的影响. 结果表明,游离铁离子在UV下可直接光解染料MO,降解速率为0.004 min-1(Fe2+)和0.014 min-1(Fe3+),但抑制了UV/AA法(0.025 min-1)降解MO的效果. 三种形态铁离子对MO降解的抑制顺序为Fe2+(0.010 min-1)>Fe3+(0.012 min-1)>Fe(AA)3(0.018 min-1). 通过检测不同体系的紫外可见吸收谱图及降解产物,推测出抑制作用主要源于铁离子络合游离AA引起的内滤光效应及对游离AA的消耗,对UV/AA法的实际应用有指导意义.

关键词: UV/AA法, 铁离子, MO, 光降解, 络 合, 内滤光

Abstract: UV/acetylacetone(UV/AA)process has been proven as an efficient approach for the decoloration of dyes. However,limited work has been done on the sensitivity of the UV/AA process to co-existing matters,such as iron. In the present study,Methyl Orange(MO),a typical hard-degraded azo dye was selected to explore the influences mentioned above. The photo-degradation of MO was conducted under the variant combinations of AA with iron species in Fe2+,Fe3+ and Fe(Ⅲ)forms(Fe(AA)3). The pseudo first-order decoloration rate constants of MO in these photochemical processes followed such an order:UV/Fe2+/AA(0.010 min-1)

Key words: UV/AA, ironion, MO, photodegradation, complexation, inner filter effect

中图分类号: 

  • X131
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