The study on visible photocatalytic activity of an oxalate-extended Pb(II) coordination polymer

Abstract

Under the hydrothermal method, a Pb(II) coordination polymer [Pb(ox)(phen) 2 ]·5H 2 O 1 (ox = oxalate, phen = 1,10-phenanthroline) was obtained. Ox ligands exhibit a m 2 -coordination mode, which connect Pb 2+ centers into a 1-D single-chain with ancillary phen molecules. Interestingly, adjacent phen molecules between the chains exist π…π stacking interaction, which extend the 1-D chain into a 2-D supramolecular layer. Compound 1 showed outstanding photocatalytic performance and the degradation efficiency of methylene blue with H 2 O 2 could reach 95.69% under the irradiation of visible light at pH = 10. In addition, 5 cycles of degradation experiments were also carried out, and it was found that the degradation efficiency values with and without H 2 O 2 were reduced by 1.46% and 1.08%, respectively. It was also discussed that which free radical played the dominant role in the photocatalytic process. What’s more, we speculated the possible reaction mechanism based on the Mott–Schottky curve. Meanwhile, the UV visible diffuse reflection of compound 1 was also investigated.