Abstract
To investigate the effects of divalent metal ions on the photophysical and photocatalytic properties of MII/Cr–CO3 layered double hydroxides (LDHs), we varied the MII metal ions (Co, Ni, Cu, and Zn) at a constant MII/Cr atomic ratio of 2:1. The phase structures and textural and optical properties of these catalysts were characterized by powder X-ray diffraction (PXRD), Brunauer–Emmett–Teller (BET) surface area, Fourier transform infrared (FTIR) spectroscopy, photoluminescence (PL) spectroscopy, and diffuse-reflectance UV–vis (DRUV–vis) spectroscopy. The PXRD measurements demonstrated that all of the as-synthesized LDHs had well-defined layered structures except Ni/Cr–CO3 LDH (LDH2). Optical difference spectra revealed that absorption in the visible region can be attributed to metal-to-metal charge transfer (MMCT) excitation of oxo-bridged bimetallic linkages of MII–O–CrIII in the two neighboring MO6 octahedra. The photocatalytic performances of these catalysts were examined in the degradation of methyl or...
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