National Institute of Alternative Technologies for Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactive Substances (INCT-DATREM), Institute of Chemistry, São Paulo State University (UNESP), Av. Prof. Francisco Degni 55, Araraquara, SP, 14801-970, Brazil.
Institute of Bioscience (IBB), São Paulo State University (UNESP), Botucatu Campus, R. Prof. Dr. Antônio Celso Wagner Zanin 250, Botucatu, SP, 18618-689, Brazil.
Environ Sci Pollut Res Int. 2022 Sep;29(42):64112-64123. doi: 10.1007/s11356-022-20296-w. Epub 2022 Apr 26.
This work shows that ZrO, used as a modifier of TiO, can be highly effective as a co-catalyst in the photoelectrocatalytic degradation of dibutyl phthalate (DBP). The monoclinic phase of ZrO was easily obtained by chemical deposition on TiO nanotubes (E ~3.06 eV), increasing the occurrence of hydroxyl groups and acidity on the surface of the material, as observed by electrophoretic mobility measurements. The optimized photoelectrocatalysis conditions were bias potential of 1.5 V, 0.1 M NaSO (initial pH 6) supporting electrolyte, 6 ppm of DBP, and UV/Vis irradiation. These conditions resulted in complete removal of DBP, down to the limit of detection of the chromatographic method used, with up to complete TOC removal after 60 min of treatment. The effects of pH, bias potential, DBP concentration, and applied potential were investigated. The method was compared with photocatalysis and photolysis. An oxidation mechanism is proposed, based on intermediates detected by LC-MS/MS during 10 min of photoelectrocatalysis.
这项工作表明，ZrO 作为 TiO 的改性剂，在邻苯二甲酸二丁酯（DBP）的光电催化降解中作为共催化剂非常有效。ZrO 通过化学沉积在 TiO 纳米管上（E≈3.06eV）很容易获得单斜相，增加了材料表面的羟基和酸度，这可以通过电泳迁移率测量观察到。优化的光电催化条件为 1.5V 的偏置电势、0.1M NaSO（初始 pH6）支持电解质、6ppm 的 DBP 和 UV/Vis 照射。在 60 分钟的处理后，这些条件导致 DBP 完全去除，降至所用色谱方法的检测限，TOC 去除率高达 100%。研究了 pH、偏置电势、DBP 浓度和施加电势的影响。该方法与光催化和光解进行了比较。根据光电催化 10 分钟内通过 LC-MS/MS 检测到的中间体，提出了一种氧化机制。
