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Study of visible-light photocatalytic degradation of 2,4-dichlorophenoxy acetic acid in batch and circulated-mode photoreactors

  • Sorur Safa
  • Majid Mirzaei
  • Foad KazemiEmail author
  • Mohammad Taghi Ghaneian
  • Babak Kaboudin
Research Article
  • 9 Downloads

Abstract

Purpose

The consumption of pesticides and chemical fertilizers is one of the major environmental and health problems. In this report, 2,4-dichlorophenoxyacetic acid (2,4-D) was chosen to evaluate the impact of photodegradation using LED (Light-emitting diode) (400 and 365 nm) sources in batch and programmable circulated-mode photoreactors respectively.

Methods

A β-cyclodextrin (β-CD) grafted titanium dioxide P25 (P25/β-CD) and complexation of 2,4-D and β-CD were synthesized via photoinduced and spray-drying methods, respectively. The structures were characterized. Moreover, we investigated the effects of the amount of catalyst, the β-CD amount on bed catalyst, irradiation time, kind of photoreactor on the photocatalytic degradation efficiency.

Results

Based on the results of experiments in batch reactor, the optimum amount of TiO2, β-CD grafted by catalyst were 1 and 0.1 g/L, respectively. In batch-mode the photodegradation efficiency of 2,4-D after 5 h with P25, P25/β-CD as a photocatalyst and 2,4-D/β-CD complex with P25 photocatalyst were approximately 81, 85 and 95% respectively. After 8 h of irradiation in circulated-mode reactor, degradation yields with P25, P25/β-CD and 2,4-D/β-CD complex along with P25 were 89, 91 and 96% respectively. On the other hand, the circulated-mode photoreactor with high efficiency was appropriate to degradation of the high concentration of 2,4-D solution (200 mg/L). After 5 successive cycles with 25 h of irradiation, P25 and P25/β-CD maintained as high 2,4-D removal efficiency as 82.6, 84% respectively, with excellent stability and reusability.

Conclusion

The photodegradation method can be used as an effective and environmental friendly process in the degradation of organic compound.

Keywords

2,4-Dichlorophenoxyacetic acid (2,4-D) Light-emitting diode (LED) 2,4-D/β-CD complex Batch-mode photoreactor Circulated-mode photoreactor 

Notes

Acknowledgements

The authors acknowledge the support by Shahid Sadoughi University of Medical Sciences and Institute for Advanced Studies in Basic Sciences (IASBS) Research Council of this work.

Funding

The present work was financially supported by Shahid Sadoughi University of Medical Sciences.

Compliance with ethical standards

Conflicts of interest

The authors confirm no conflicts of interest associated with this publication.

Consent for publication

All authors agreed to publish this article.

Ethics approval and consent to participate

There was no human participation in this study.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Sorur Safa
    • 1
  • Majid Mirzaei
    • 2
  • Foad Kazemi
    • 3
    Email author
  • Mohammad Taghi Ghaneian
    • 4
  • Babak Kaboudin
    • 3
  1. 1.Department of Environmental Health EngineeringInternational Campus of Shahid Sadoughi University of Medical SciencesYazdIran
  2. 2.Department of PhysicsInstitute for Advanced Studies in Basic Sciences (IASBS)ZanjanIran
  3. 3.Department of ChemistryInstitute for Advanced Studies in Basic Sciences (IASBS)ZanjanIran
  4. 4.Department of Environmental Health EngineeringShahid Sadoughi University of Medical SciencesYazdIran

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