Ndong, Landry Biyoghe Bi Kanfolo, Frank Herve Yeo Predominance role of the superoxide radical over the hydroxyl radical in the dechlorination of trichloroethene in aqueous phase using Cu doped TiO<sub>2</sub> <p>Trichloroethylene (TCE), a frequently used chlorinated solvent has been completely degraded in aqueous solution over the as-synthesised Cu-TiO<sub>2</sub> irradiated with UV light. The effect of pH and the role played by specific generated reactive oxygen species in the mineralisation process were evaluated. Cu-TiO<sub>2</sub> was synthesised and characterised according to our previous study. The photodegradation results, which followed the pseudo-first-order kinetic model, revealed that pH had a negligible effect on the degradation as the complete dechlorination occurred in all adjusted pH solutions. In addition, probe compound tests using nitrobenzene and tetrachloromethane suggested that the hydroxyl radical (<sup>•</sup>OH) is mainly generated when coupling UV with Cu-TiO<sub>2</sub>, and the superoxide radical anion (O<sub>2</sub><sup>•−</sup>) is highly generated when UV is applied alone. Free radical quenching studies demonstrated that O<sub>2</sub><sup>•−</sup> is the major radical responsible for the degradation of TCE compared to <sup>•</sup>OH. The results obtained in the present study can serve as a support for further studies on the removal of TCE using UV coupling catalyst.</p> Cu-TiO2;UV light;superoxide radical;hydroxyl radical;trichloroethene;polluted water remediation 2020-01-08
    https://tandf.figshare.com/articles/journal_contribution/Predominance_role_of_the_superoxide_radical_over_the_hydroxyl_radical_in_the_dechlorination_of_trichloroethene_in_aqueous_phase_using_Cu_doped_TiO_sub_2_sub_/11555484
10.6084/m9.figshare.11555484.v1