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.