Pd0 nanoparticles confined within the pores of UiO-66(Zr) for efficient Fenton-like catalysis

• Published in: Materials today communications Vol. 39; p. 109385
• Main Authors: Cheng, Meina, Chen, Yijun, Wang, Xiaowen, Liu, Feng, Jin, Long, Ma, Sanjian, Wu, Jianhua, Dai, Guoliang, Lin, Zixia, Liu, Xin
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2024
• Subjects: Carbamazepine; FeIII/FeII cycling; Fenton reaction; Hydrogen; Pd@UiO-66(Zr); Pd@UiO-66(Zr); Fenton reaction; Hydrogen; Carbamazepine; FeIII/FeII cycling
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2024.109385

The iron sludge problem derived from the conventional Fenton reaction could be solved by accelerating the FeIII/FeII cycle during the reaction. The nano-confined catalyst Pd@UiO-66(Zr) was synthesized by enclosing Pd0 nanoparticles within the pore channels of UiO-66(Zr). An improved hydrogen-promoted Fenton system named MOFs-H2-Accelerated Catalytic Fenton (MHACF@UiO-66(Zr)) was constructed by introducing Pd@UiO-66(Zr) and H2 into the conventional Fenton reaction system at ambient temperature and pressure. In this novel system, the Pd0 nanoparticles confined within the UiO-66(Zr) pores can adsorb and activate H2, thus accelerating the FeIII/FeII cycle. In addition, the MHACF@UiO-66(Zr) system was able to achieve 100 % carbamazepine (CBZ) degradation efficiency within only 10 seconds with the addition of only 25 μmol∙L-1 of FeII. Its degradation efficiency was 4.47 times higher than that of conventional Fenton. The degradation of CBZ by the novel MHACF@UiO-66(Zr) system is dominated by hydroxyl radical and singlet oxygen. The degradation pathway of CBZ was confirmed by the detection of intermediate products combined with the analysis of Density Functional Theory (DFT). Morphological and structural characterization of Pd@UiO-66(Zr) as well as recyclability experiments were carried out after eight cycles of tests. The results confirmed that the structure of Pd@UiO-66(Zr) was stable. [Display omitted]