Environmental Science and Pollution Research

, Volume 25, Issue 18, pp 17300–17309 | Cite as

Reductive decolorization of azo dyes via in situ generation of green tea extract-iron chelate

  • Ling Yu
  • Yewen Qiu
  • Yang Yu
  • Shanquan Wang
Research Article


In this study, rapid decolorization of azo dyes was achieved by in situ-generated green tea extract-iron (GTE-Fe) chelate for the first time. When changing reaction conditions from the aerobic condition to the anaerobic condition, the decolorization efficiencies of two azo dyes, i.e., acid orange 7 (AO7) and acid black 1 (AB1), increased from 46.38 and 83.17 to 90.13 and 95.37%, respectively. The recalcitrant AO7 was then selected as the targeting pollutant in subsequent optimization and mechanism studies. Experimental evidences showed that the initial concentrations of AO7, Fe(III), and GTE are the key factors to optimize the decolorization efficiency. Further characterization studies by spectroscopic analysis, including FESEM, FTIR, and XPS, suggested that the major mechanism of AO7 decolorization is the nucleophilic attack of the oxygen in green tea polyphenols (GTP), and this attack could be facilitated by the organometal chelation. This study provided an efficient and environmental friendly strategy to decolorize azo dyes via in situ generation of the GTE-Fe chelate, as well as its mechanistic insights, shedding lights on in situ remediation of azo dye pollution.

Graphical abstract


Green tea extract-iron chelate Decolorization Azo dye Green tea polyphenols In situ generation 



This study was supported by the Guangzhou Science and Technology Program general project (201804010141).

Supplementary material

11356_2018_1907_MOESM1_ESM.docx (150 kb)
ESM 1 (DOCX 150 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Ling Yu
    • 1
    • 2
    • 3
  • Yewen Qiu
    • 1
    • 4
  • Yang Yu
    • 5
  • Shanquan Wang
    • 1
    • 2
    • 3
  1. 1.School of Environmental Science and EngineeringSun Yat-Sen UniversityGuangzhouChina
  2. 2.Environmental Microbiome Research CenterSun Yat-Sen UniversityGuangzhouChina
  3. 3.Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation TechnologyGuangzhouChina
  4. 4.School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  5. 5.Guangdong Key Laboratory of Environmental Pollution and Health, and School of EnvironmentJinan UniversityGuangzhouChina

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