摘要
A simple, facile in situ reduction approach is reported for the synthesis of Pd- nanoparticle-decorated phosphotungstic acid （PTA）-MIL-100（Fe） nanocomposites （Pd-H3PW12040-MIL-100（Fe）, denoted Pd-PTA-MIL-100（Fe））. During the in situ synthesis, PTA is encapsulated into the matrix of MIL-100（Fe） and serves as a UV-switchable reducing agent, resulting in highly dispersed Pd NPs. Using the photocatalytic degradation of pharmaceuticals and personal care products as model reactions, the ternary Pd-PTA-MIL-100（Fe） hybrids exhibited enhanced photocatalytic activity compared with their foundation matrices, the binary PTA-MIL-100（Fe） nanocomposite. Based on photoelectrochemical analyses, the improved photocatalytic performance can be attributed to the well-known electronic conductivity of the Pd NPs, the fast electron transport of PTA, the intense visible-light absorption of MIL-100（Fe）, and the matched energy levels of the three components： MIL-100（Fe）, PTA, and Pd NPs. Importantly, almost no Fe and W ions were leached from the samples during the reaction, demonstrating the photostability of the Pd-PTA-MIL-100（Fe） composite. In addition, possible photocatalytic reactions mechanisms have also been investigated.
A simple, facile in situ reduction approach is reported for the synthesis of Pd- nanoparticle-decorated phosphotungstic acid （PTA）-MIL-100（Fe） nanocomposites （Pd-H3PW12040-MIL-100（Fe）, denoted Pd-PTA-MIL-100（Fe））. During the in situ synthesis, PTA is encapsulated into the matrix of MIL-100（Fe） and serves as a UV-switchable reducing agent, resulting in highly dispersed Pd NPs. Using the photocatalytic degradation of pharmaceuticals and personal care products as model reactions, the ternary Pd-PTA-MIL-100（Fe） hybrids exhibited enhanced photocatalytic activity compared with their foundation matrices, the binary PTA-MIL-100（Fe） nanocomposite. Based on photoelectrochemical analyses, the improved photocatalytic performance can be attributed to the well-known electronic conductivity of the Pd NPs, the fast electron transport of PTA, the intense visible-light absorption of MIL-100（Fe）, and the matched energy levels of the three components： MIL-100（Fe）, PTA, and Pd NPs. Importantly, almost no Fe and W ions were leached from the samples during the reaction, demonstrating the photostability of the Pd-PTA-MIL-100（Fe） composite. In addition, possible photocatalytic reactions mechanisms have also been investigated.
