10.1021/acs.est.8b00281.s001
Yejin Choi
Yejin
Choi
Ho-Il Yoon
Ho-Il
Yoon
Changha Lee
Changha
Lee
L’ubica Vetráková
L’ubica
Vetráková
Dominik Heger
Dominik
Heger
Kitae Kim
Kitae
Kim
Jungwon Kim
Jungwon
Kim
Activation
of Periodate by Freezing for the Degradation
of Aqueous Organic Pollutants
American Chemical Society
2018
434 nm
Aqueous Organic Pollutants
4- chlorophenol
furfuryl alcohol
water treatment
FFA
degradation rate increases
freeze concentration effect
monoprotonated CR
absorption wavelength
proton-coupled degradation process
518 nm
IO
degradation experiments
winter night show
diprotonated CR
2018-04-12 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Activation_of_Periodate_by_Freezing_for_the_Degradation_of_Aqueous_Organic_Pollutants/6163745
A new
strategy (i.e., freezing) for the activation of IO<sub>4</sub><sup>–</sup> for the degradation of aqueous organic pollutants
was developed and investigated. Although the degradation of furfuryl
alcohol (FFA) by IO<sub>4</sub><sup>–</sup> was negligible
in water at 25 °C, it proceeded rapidly during freezing at −20
°C. The rapid degradation of FFA during freezing should be ascribed
to the freeze concentration effect that provides a favorable site
(i.e., liquid brine) for the proton-coupled degradation process by
concentrating IO<sub>4</sub><sup>–</sup>, FFA, and protons.
The maximum absorption wavelength of cresol red (CR) was changed from
434 nm (monoprotonated CR) to 518 nm (diprotonated CR) after freezing,
which confirms that the pH of the aqueous IO<sub>4</sub><sup>–</sup> solution decreases by freezing. The degradation experiments with
varying experimental parameters demonstrate that the degradation rate
increases with increasing IO<sub>4</sub><sup>–</sup> concentration
and decreasing pH and freezing temperature. The application of the
IO<sub>4</sub><sup>–</sup>/freezing system is not restricted
to FFA. The degradation of four other organic pollutants (i.e., tryptophan,
phenol, 4-chlorophenol, and bisphenol A) by IO<sub>4</sub><sup>–</sup>, which was negligible in water, proceeded during freezing. In addition,
freezing significantly enhanced the IO<sub>4</sub><sup>–</sup>-mediated degradation of cimetidine. The outdoor experiments performed
on a cold winter night show that the IO<sub>4</sub><sup>–</sup>/freezing system for water treatment can be operated without external
electrical energy.