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Molecularly imprinted TiO2 photocatalysts for degradation of diclofenac in water

de Escobar, Cícero Coelho; Moreno Ruiz, Yolice Patricia; dos Santos, João Henrique Zimnoch and Ye, Lei LU (2018) In Colloids and Surfaces A: Physicochemical and Engineering Aspects 538. p.729-738
Abstract

In order to improve the selectivity in photocatalytic process, molecularly imprinted photocatalysts containing a low loading of TiO2 (from 6.6 to 16.6% of total mass) were prepared for photocatalytic degradation of an organic pollutant, diclofenac (DIC). The photocatalytic component TiO2 (P25), with and without being doped with Cu2O, was embedded in diclofenac-imprinted polymers. The molecularly imprinted polymers (MIPs) and the composite photocatalysts exhibited a superior specific target recognition for selective degradation of DIC over non-target reference molecules, fluoxetine (FLU) and paracetamol (PARA). In contrast to the non-selective commercial sample of TiO2, the average value of... (More)

In order to improve the selectivity in photocatalytic process, molecularly imprinted photocatalysts containing a low loading of TiO2 (from 6.6 to 16.6% of total mass) were prepared for photocatalytic degradation of an organic pollutant, diclofenac (DIC). The photocatalytic component TiO2 (P25), with and without being doped with Cu2O, was embedded in diclofenac-imprinted polymers. The molecularly imprinted polymers (MIPs) and the composite photocatalysts exhibited a superior specific target recognition for selective degradation of DIC over non-target reference molecules, fluoxetine (FLU) and paracetamol (PARA). In contrast to the non-selective commercial sample of TiO2, the average value of selectivity of the imprinted catalysts for photocatalytic degradation of DIC was estimated to be 2.8, which suggests that the specific binding sites created by the molecular imprinting are essential for gaining high catalytic selectivity and efficiency. After 6 cycles of testing under UV-light, the imprinted catalysts maintained almost the same efficiency for photo degradation of DIC. In addition, the morphology and the structure of the imprinted catalysts remained after repeated uses. The results suggest that it is feasible to use MIPs to control the selectivity of photocatalytic degradation of organic pollutants.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
Diclofenac degradation, Imprinted catalyst, Selectivity photoctalysis
in
Colloids and Surfaces A: Physicochemical and Engineering Aspects
volume
538
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85034866438
ISSN
0927-7757
DOI
10.1016/j.colsurfa.2017.11.044
language
English
LU publication?
yes
id
2f77ae57-7f33-4873-9634-b9a7af57052b
date added to LUP
2017-12-07 10:26:50
date last changed
2018-01-07 12:27:29
@article{2f77ae57-7f33-4873-9634-b9a7af57052b,
  abstract     = {<p>In order to improve the selectivity in photocatalytic process, molecularly imprinted photocatalysts containing a low loading of TiO<sub>2</sub> (from 6.6 to 16.6% of total mass) were prepared for photocatalytic degradation of an organic pollutant, diclofenac (DIC). The photocatalytic component TiO<sub>2</sub> (P25), with and without being doped with Cu<sub>2</sub>O, was embedded in diclofenac-imprinted polymers. The molecularly imprinted polymers (MIPs) and the composite photocatalysts exhibited a superior specific target recognition for selective degradation of DIC over non-target reference molecules, fluoxetine (FLU) and paracetamol (PARA). In contrast to the non-selective commercial sample of TiO<sub>2</sub>, the average value of selectivity of the imprinted catalysts for photocatalytic degradation of DIC was estimated to be 2.8, which suggests that the specific binding sites created by the molecular imprinting are essential for gaining high catalytic selectivity and efficiency. After 6 cycles of testing under UV-light, the imprinted catalysts maintained almost the same efficiency for photo degradation of DIC. In addition, the morphology and the structure of the imprinted catalysts remained after repeated uses. The results suggest that it is feasible to use MIPs to control the selectivity of photocatalytic degradation of organic pollutants.</p>},
  author       = {de Escobar, Cícero Coelho and Moreno Ruiz, Yolice Patricia and dos Santos, João Henrique Zimnoch and Ye, Lei},
  issn         = {0927-7757},
  keyword      = {Diclofenac degradation,Imprinted catalyst,Selectivity photoctalysis},
  language     = {eng},
  month        = {02},
  pages        = {729--738},
  publisher    = {Elsevier},
  series       = {Colloids and Surfaces A: Physicochemical and Engineering Aspects},
  title        = {Molecularly imprinted TiO<sub>2</sub> photocatalysts for degradation of diclofenac in water},
  url          = {http://dx.doi.org/10.1016/j.colsurfa.2017.11.044},
  volume       = {538},
  year         = {2018},
}