School of Ecology and Environment, Anhui Normal University, Wuhu, 241002, PR China; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu, 210023, PR China.
School of Ecology and Environment, Anhui Normal University, Wuhu, 241002, PR China.
Chemosphere. 2023 Jun;327:138515. doi: 10.1016/j.chemosphere.2023.138515. Epub 2023 Mar 25.
Monoiodoacetic acid (MIAA) is one of the highly toxic halogenated disinfection by-products, which is formed during water disinfection processes. Catalytic hydrogenation with supported noble metal catalyst is a green and effective technique for the transformation of halogenated pollutant, but its activity still needs to be identified. In this study, Pt nanoparticles were supported on CeO modified γ-AlO (Pt/CeO-AlO) by chemical deposition method and the synergistic effect of AlO and CeO on catalytic hydrodeiodination (HDI) of MIAA was systematically studied. Characterizations revealed that Pt dispersion could be improved by the introduced CeO through the formation of Ce-O-Pt bond and MIAA adsorption could be facilitated by high Zeta potential of AlO component. Furthermore, optimal Pt/Pt could be obtained by adjusting CeO deposition amount on AlO, which could effectively facilitate the activation of C-I bond. Therefore, Pt/CeO-AlO exhibited remarkable catalytic activities and TOF values compared with those of Pt/CeO and Pt/AlO Through detailed kinetic experiments and characterization, the extraordinary catalytic performance of Pt/CeO-AlO can be attributed to the abundant Pt sites as well as the synergistic effect between CeO and AlO.
一碘乙酸（MIAA）是一种剧毒的卤代消毒副产物，在水消毒过程中形成。负载贵金属催化剂的催化加氢是一种绿色有效的卤代污染物转化技术，但仍需确定其活性。在这项研究中，采用化学沉积法将 Pt 纳米颗粒负载在 CeO 改性的 γ-AlO（Pt/CeO-AlO）上，系统研究了 AlO 和 CeO 对 MIAA 催化加氢脱碘（HDI）的协同作用。表征结果表明，CeO 的引入通过形成 Ce-O-Pt 键可以提高 Pt 的分散度，AlO 组分的高 Zeta 电位可以促进 MIAA 的吸附。此外，通过调整 CeO 在 AlO 上的沉积量，可以获得最佳的 Pt/Pt，从而有效促进 C-I 键的活化。因此，与 Pt/CeO 和 Pt/AlO 相比，Pt/CeO-AlO 表现出显著的催化活性和 TOF 值。通过详细的动力学实验和表征，Pt/CeO-AlO 的卓越催化性能归因于丰富的 Pt 位以及 CeO 和 AlO 之间的协同作用。
