A hybrid nanomaterial based on TiO2 and graphite oxide (TiO2-GrO) was tested for the photocatalytic water removal behavior of ibuprofen and naproxen classified as non-steroidal antiinflamatory drugs (NSAIDS) and three azo dyes: methyl red, methyl orange and eriochrome black T under UV-light. The photocatalytic material was prepared via a hydrothermal synthesis. The same organics were electrolyzed on TiO2 nanotubes decorated with highly dispersed PbO2. These electrodes were prepared by anodization of titanium plates (2 cm2) at 30 V, in a glycerol-water medium containing sodium fluoride salt, followed by annealing at 500°C and electrodeposition of PbO2 from a lead nitrate solution. The electrocatalytic experiments were performed under galvanostatic conditions at 30 mAcm-2. For both photocatalytic and electrocatalytic experiments, the organics removal was monitored in both a 0.5 M sulfuric acid aqueous solution (pH 1.8) and in 0.2 M basic sodium sulfate (pH 9.0); and their concentration decay was mainly followed by UV-vis spectrophotometric analysis. For naproxen and ibuprofen, an increase in the analytical peak during both catalytic processes was observed, which is an indication of the preservation of the aromatic structure during the allowed reaction time. On the other side, for the selected dyes, in both catalytic processes, methyl red and methyl orange underwent almost complete discoloration during the allowed reaction time in acid medium, while for eriochrome black T only a partial discoloration was observed. In contrast, in basic media, complete discoloration was not achieved during the reaction time for the three azo dyes for both photocatalytic and electrocatalytic processes.

Electrocatalytic and photocatalytic behavior of hybrid TiO2 nanomaterials towards water removal of NSAIDS and selected dyes

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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