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Journal of Sol-Gel Science and Technology

, Volume 88, Issue 1, pp 22–32 | Cite as

The role of titania layers in decomposition of endocrine disruptors under UV Light

  • Olga Solcova
  • Lucie Spacilova
  • Magdalena Caklova
  • Pavel Dytrych
  • Ywetta Maleterova
  • Jakub Bumba
  • Frantisek Kastanek
  • Jiri Hanika
Original Paper: Industrial and technological applications of sol-gel and hybrid materials
  • 90 Downloads

Abstract

Degradation of three different endocrine disruptors (EDs) was thoroughly studied on prepared durable thin layers of titanium dioxide with an anatase crystalline structure. Specially constructed laboratory reactors bringing information on all individual processes (photolysis, photocatalysis, sorption) involved in decomposition of the studied EDs (17α-ethynylestradiol, bisphenol A and 4-nonylphenol) were applied. It was found that photolytic removal of EDs is the fastest degradation process; nevertheless, this method may be less effective regarding all indicators including toxicity. It was verified that individual degradation processes (photolysis and photocatalysis) showed a significantly different influence on toxicity of resulting solutions. During the photolytic process, EDs degradation caused increasing toxicity contrary to the photocatalytic process. Obtained results were corroborated by a mathematical model, which showed that a limitation step for photocatalysis is a sorption and for photolysis a toxicity of resulting products.

Keywords

Titanium dioxide Sol gel process Endocrine disruptor Photocatalysis Photolysis 

Abbreviation

EDC

Endocrine disrupting compound

BPA

Bisphenol A

EE2

17α-Ethynylestradiol

4-NPh

4-Nonylphenol

UVA

UV-A light (315–400nm)

UVB

UV-B light (280–315nm)

UVC

UV-C light (100–280nm)

TTIP

Titanium tetra-isopropoxide

PDA

Photo-diode-array

c0 = c(i)/[c(i)]t=0 i=A,E,F

normalized concentration of endocrine disruptor in water at time 0 [-]

c1 =c(j)/[c(j)]t=0; j=B, C, D, G

normalized equilibrium concentration of disruptor on catalyst at time 0 [-]

c(A)

Normalized concentration of disruptor in the medium [-]

c(B)

Normalized concentration of the catalyst [-]

c(C)

Normalized concentration of adsorbate of endocrine disruptor on the catalyst [-]

c(D)

Normalized concentration of photocatalysis product adsorbate on the on the catalyst [-]

c(E)

Normalized concentration of photocatalysis product in the medium [-]

c(F)

Normalized concentration of photolysis product in the medium [-]

c(G)

Normalized concentration of photolysis product on the catalyst [-]

k1, k2, …, kn

reaction rate constants [mol1−n Ln−1 s−1]

r1, r2, …, rn

reaction rates [mol s−1]

ODE

Ordinary differential equation

dt

Time difference [s]

Notes

Acknowledgements

The financial support of the Technology Agency of the Czech Republic No. TA04020700 is gratefully acknowledged. We thank to Z Kresinova and M Ezechias (Institute of Microbiology of the CAS) and J Rezek (Institute of Botany of the CAS) for analyses.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Chemical Process Fundamentals of the CASPrague 6Czech Republic

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